• I rewrote the CMake files so that they work under Windows using Visual Studio. I also improved their Linux behavior. My files are confirmed to work with MSVC12 (Windows), gcc5.3 and ARMgcc4.6 (both Linux, see README). Under Windows, you need the quite recent version 3.4 of CMake to build the shared libraries, though, because Squirrel does not export any DLL symbols by default, and the CMake option to export everything into the DLL has just been adopted into v3.4. As long as you don't use MSVC, it only asks for CMake v2.8.
• I tested Squirrel on a few more platforms and added them to the README. Most notably, I confirmed that Squirrel can run on ARM.
• I fixed every warning gcc 5.3.1 generates if the flags -Wall and -Wextra are specified. It now compiles cleanly on my system (amd64).

Sometimes SQVM::IsFalse() hangs our app and when I print the content of &o it returns 0xFFFFFFFFFFFFFF0 Seems like a pointer overflow to me. It's completely random, and only happens when the application starts. it crashes in 20% of cases, sometimes more often.

Hello ! I'm converting tests from lua 5.1 ( http://www.inf.puc-rio.br/~roberto/lua/lua5.1-tests.tar.gz ) to SquiLu/Squirrel and found several unexpected errors. Like this one for closures:

print( "testing closures and coroutines\n" )

// testing closures with 'for' control variable
local a = []
for(local i=0; i < 10; ++i)
{
  a.append({set = function(x){ i=x; }, get = function (){ return i; }})
  if( i == 2 ) break;
}
assert(a.len() == 3)
//code to debug start
a[0].set(10)
print("get")
print(a[0].get)
print("\n")
print("get")
print(a[0].get())
print("\n")
print("get")
print(a[1].get())
print("\n")
print("get")
print(a[1].get)
print("\n")
print("get")
print(a[2].get())
print("\n")
print("get")
print(a[2].get)
print("\n")
//code to debug end
assert(a[1].get() == 1)
a[1].set('a')
assert(a[2].get() == 2)
assert(a[1].get() == 'a')

Result:

testing closures and coroutines
get(function : 0x0x9cfd50)
get(function : 0x0x9c5e50)
get(function : 0x0x9c5e50)
get(function : 0x0x9d0c30)
get(function : 0x0x9c5e50)
get(function : 0x0x9ce060)

AN ERROR HAS OCCURRED [assertion failed]

CALLSTACK
*FUNCTION [main()] closure.nut line [32]

LOCALS
[a] ARRAY
[vargv] ARRAY
[this] TABLE

Here is the original lua 5.1 code (that works):

-- testing closures with 'for' control variable
a = {}
for i=1,10 do
  a[i] = {set = function(x) i=x end, get = function () return i end}
  if i == 3 then break end
end
assert(a[4] == nil)
a[1].set(10)
assert(a[2].get() == 2)
a[2].set('a')
assert(a[3].get() == 3)
assert(a[2].get() == 'a')

Here is another simple variation that also fails:

// testing closures with 'for' control variable x break

local f

for(local i=1; i <= 3; ++i)
{
  f = function () { return i;}
  break
}
assert(f() == 1)

Output:

AN ERROR HAS OCCURRED [assertion failed]

CALLSTACK
*FUNCTION [main()] closure.nut line [10]

LOCALS
[f] CLOSURE
[vargv] ARRAY
[this] TABLE

Add new operator ?? such that a ?? b works as (a!=null) ? a : b

C#-like ?? syntax was chosen over Elvis operator ?: which is common in other languages because it is not equivalent to visually similar ternary ? : operator (which checks for falsiness, not null).

It evaluates expressions until the first non-null value (just like || operators for the first 'true' one)

Operator precendence is also follows C# design, so that ?? has lower priority than ||

Null propagation operators ?. and ?[] are similar to ones in C# 6.0 or Kotlin

local tbl = {bar=123}
tbl.bar     // returns 123
tbl.baz     // throws an error
tbl?.bar    // returns 123
tbl?.baz    // returns null
null.bar    // throws an error
null?.bar   // returns null
tbl?["bar"] // returns 123
tbl?[4567]  // returns null

This works for any type (internally done via SQVM::Get(), like an 'in' operator), including null.

This adds new opcodes: _OP_NULLGET and _OP_NULLCOALESCE.

I embedded Squirrel interpreter in my C application and I try to export to Squirrel a table (named KSR) with functions, some of them grouped in subtables, so in Squirrel should be like:

KSR = {
  f1 = fp1,
  f2 = fp2,
  m1 = {
    f3 = fp3,
    f4 = fp4,
  },
  m2 = {
    f5 = fp5,
    f6 = fp6,
  },
  m3 = ...
}

I got a crash that I couldn't find a reason for it, which happens when exporting a subtable (like m1 or m2).

Let's say exporting m2 is causing the crash, the odd things:

• I use same code to export each of the subtables
• if m2 is exported, but more at the beginning, it is not crashing. When it crashes is like the 20th exported subtable, if it is among the firsts, then no crash.

It looks like the crash happens when there is a collision on the table hash slot, but wonder why is not happening when m2 is loaded earlier, maybe someone can spot faster where the issue resides -- the backtrace from gdb is:

#0  0x00007f198411f067 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007f1984120448 in __GI_abort () at abort.c:89
#2  0x00007f1984118266 in __assert_fail_base (fmt=0x7f1984250f18 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", 
    assertion=assertion@entry=0x7f197e4a3ef9 "othern->next != __null", file=file@entry=0x7f197e4a3ed4 "sqtable.cpp", 
    line=line@entry=143, 
    function=function@entry=0x7f197e4a3f20 <SQTable::NewSlot(SQObjectPtr const&, SQObjectPtr const&)::__PRETTY_FUNCTION__> "bool SQTable::NewSlot(const SQObjectPtr&, const SQObjectPtr&)") at assert.c:92
#3  0x00007f1984118312 in __GI___assert_fail (assertion=0x7f197e4a3ef9 "othern->next != __null", 
    file=0x7f197e4a3ed4 "sqtable.cpp", line=143, 
    function=0x7f197e4a3f20 <SQTable::NewSlot(SQObjectPtr const&, SQObjectPtr const&)::__PRETTY_FUNCTION__> "bool SQTable::NewSlot(const SQObjectPtr&, const SQObjectPtr&)") at assert.c:101
#4  0x00007f197e485041 in SQTable::NewSlot (this=0x14137e0, key=..., val=...) at sqtable.cpp:143
#5  0x00007f197e48e91b in SQVM::NewSlot (this=this@entry=0x13fc7f0, self=..., key=..., val=..., bstatic=<optimized out>)
    at sqvm.cpp:1461
#6  0x00007f197e463934 in sq_newslot (v=0x13fc7f0, idx=<optimized out>, bstatic=0) at sqapi.cpp:860

Squirrel version is 3.1 downloaded from sourceforge. Tested on Debian Jessie, Squirrel compiled with extra flags -g -fPIC (for debugging symbols and to allow linking with a shared object).

Hello ! How hard it'll be to add "include" capability in the compiler ? I did a look at it, but it was clear to me where the better place to change the code.

Would be nice to have a standard way to use several scripts with something like "require" in lua.

I did a script to mimic "require" from lua (but it need to be loaded first):

local globals = getroottable();
globals.rawset("SQ_LIB", os.getenv("SQ_LIB"));
//SQ_LIB <- os.getenv("SQ_LIB");
//print("Preload", SQ_LIB);

function sq_require(fn, env=globals)
{
    if(!env) env = globals;
    env.dofile(format("%s/%s", SQ_LIB, fn));
}

I also did a change to sq.c to allow preload a script:

void PrintUsage()
{
    scfprintf(stderr,_SC("usage: sq <options> <scriptpath [args]>.\n")
        _SC("Available options are:\n")
        _SC("   -s              compiles the file to bytecode(default output 'out.cnut')\n")
        _SC("   -o              specifies output file for the -c option\n")
        _SC("   -c              compiles only\n")
        _SC("   -d              generates debug infos\n")
        _SC("   -v              displays version infos\n")
        _SC("   -p              preload given script file\n")
        _SC("   -h              prints help\n"));
}

void loadDefaultScript(HSQUIRRELVM v, const char *script)
{
    FILE *fb = fopen(script, "rb");
    if (!fb) return;
    fclose(fb);

    SQChar srcBoot[256];
    scsnprintf(srcBoot, sizeof(srcBoot), _SC("dofile(\"%s\", false);"), script);

    if(SQ_SUCCEEDED(sq_compilebuffer(v,srcBoot, strlen(srcBoot), _SC("defaultScript"), SQTrue, SQTrue))) {
        int callargs = 1;
        sq_pushroottable(v);
        callargs += push_program_args(v, 0, sq_main_argc, sq_main_argv);
        sq_call(v, callargs,SQFalse, SQTrue);
    }
}

int getargs(HSQUIRRELVM v,int argc, char* argv[],SQInteger *retval)
{
...
                case 'p':
                    if(arg < argc) {
                        arg++;
                        preload = argv[arg];
                        loadDefaultScript(v, preload);
                    }
                    break;
                case 'v':

But it would be better to have it builtin in the compiler/language itself.

This repository implemented "import" and dynamic loading https://github.com/pfalcon/squirrel-lang . Why not have it on squirrel ? Cheers !

Hello,

There is my proposal to update sqstdlib. Documentation is updated also.

API changes:

• SQFILE now represents a SQSTREAM to file, not FILE*. SQFILE is created by sqstd_fopen() and is released by sqstd_fclose(). Functions sqstd_createfile() and sqstd_getfile() still use FILE*. Two new functions sqstd_createsqfile() and sqstd_getsqfile() to create/get SQFILE object to/from instance of file class.

• SQSTREAM is base clas of blob, file, streamreader, textreader and textwriter. SQSTREAM adds new API functions: sqstd_sread, sqstd_swrite, sqstd_sseek, sqstd_stell, sqstd_sflush, sqstd_seof, sqstd_sclose and sqstd_srelease.

• Two more methods are added to SQStream to help generalization of stream: Close and _Release. Method _Release is called by sqstd_srelease() and by stream release hooh.

• The pointer to SQRegClass structure is used as type tag.

API added:

• Three function are added to iteract with streams - sqstd_loadstream, sqstd_compilestream, sqstd_readclosurestream and sqstd_writeclosuretostream.

• New SQTStreamReader is implemented based on SQStream. Stream reader gives ability to virtualy 'mark' and 'reset' position of readed SQStream. Functions added: sqstd_streamreader, sqstd_srdrmark, sqstd_srdrreset

• Text reader/writter based on SQStream with support for ASCII, UTF-8, UTF-16BE, UTF-16LE. Two functions to create streams sqstd_textreader and sqstd_textwriter.

• Declaration helpers: sqstd_registerclass, sqstd_registermembers and sqstd_registerfunctions. Also structures to describe class/members declarations - SQRegMember and SQRegClass.

From scripting side:

• Added loadstream, dostream and writeclosuretostream.
• 'stream' class has two new methods - print and readline
• Added 'streamreader' calss.
• Added 'textreader' and 'textwriter' calss.

In my servers I make heavy use of coroutines, occasionally I need to invoke a function forcing a specific "this". Currently the options are:

function doSomething(a,b,c,d) 
{
... something here
}

// existing option 1
// requires to clone the closure(it's good for stuff like UI callbacks etc) 
// more expensive in terms of memory compared to vanilla closure

local _mydosomething = dosomething.bindenv(mythis);
_mydosomething(1,2,3,4);

// existing option 2
// this inject a "C" stack frame, prevents "susepends" and is less efficient than option 1

doSomething.call(mythis,1,2,3,4)

I was thinking of adding a new built in syntax that allows to preform a "raw call" what specifies the "this". It doesn't require any change in the VM; just compiler work, so It easy enough.

something like:

// idea 1
// add special character($ is ugly but most characters are already taken)
doSomething$(mythis,1,2,3,4)

// idea 2
// or add new keyword "thiscall"
thiscall(doSomething,mythis,1,2,3,4);

any better option regarding syntax? any thought?

Hello ! Squirrel do not check for duplicates in class declarations see example bellow that compiles without errors:

class K
{
    v1 = 0;
    v1 = 0;
    v2 = 0;

    function f1(){}
    function f1(){}
}

Hello ! I we insert a weakref on the registry table it's removed automatically when the object is released ? Example:

static SQRESULT sq_obj_releasehook(SQUserPointer p, SQInteger size)
{
    if(p)
    {
            sq_free(p, size); //no need to do anything with registrytable ?
    }
    return 0;
}

static SQRESULT sq_obj_constructor(HSQUIRRELVM v)
{
    void *obj = sq_malloc(sizeof(obj_size));
    memset(obj, 0, sizeof(obj_size));
    //setup obj
   ...
    sq_setinstanceup(v, 1, obj);
    sq_setreleasehook(v,1, sq_obj_releasehook);

    //save a weakref to allow statement return it's db
    sq_pushstring(v, _SC("obj_key") );
    sq_weakref(v, 1);
    sq_setonregistrytable(v);
    return 1;
}

Cheers !

Problem

Can't compile on macOS Sierra 10.12.4 and later using Xcode's Toolchain

Build Enviroment

My main build enviroment is as of now beta version of macOS High Sierra 10.13 Beta 2: OS: macOS High Sierra 10.13 Beta 2 (17A291m) Xcode: 9.0 Beta 2 (9M137d) Clang:

MacBook-Pro:build user$ clang --version
Apple LLVM version 9.0.0 (clang-900.0.26)
Target: x86_64-apple-darwin17.0.0
Thread model: posix
InstalledDir: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

It doesn't worked in stable macOS 10.12.4 too...

Related

This issue is pretty same as mine: https://github.com/JGRennison/OpenTTD-patches/issues/17

Console output

MacBook-Pro:squirrel_source user$ mkdir build
MacBook-Pro:squirrel_source user$ cd build
MacBook-Pro:build user$ pwd
/Users/user/sources/squirrel/build
MacBook-Pro:build user$ cmake ..
-- The C compiler identification is AppleClang 9.0.0.9000026
-- The CXX compiler identification is AppleClang 9.0.0.9000026
-- Check for working C compiler: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Check for working CXX compiler: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
CMake Warning (dev):
  Policy CMP0042 is not set: MACOSX_RPATH is enabled by default.  Run "cmake
  --help-policy CMP0042" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning.

  MACOSX_RPATH is not specified for the following targets:

   sqstdlib
   squirrel

This warning is for project developers.  Use -Wno-dev to suppress it.

-- Generating done
-- Build files have been written to: /Users/user/sources/squirrel/build
MacBook-Pro:build user$ make
Scanning dependencies of target squirrel_static
[  2%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqapi.cpp.o
[  4%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqbaselib.cpp.o
[  6%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqclass.cpp.o
[  8%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqcompiler.cpp.o
[ 10%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqdebug.cpp.o
[ 12%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqfuncstate.cpp.o
[ 14%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqlexer.cpp.o
[ 16%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqmem.cpp.o
[ 18%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqobject.cpp.o
[ 20%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqstate.cpp.o
[ 22%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqtable.cpp.o
[ 25%] Building CXX object squirrel/CMakeFiles/squirrel_static.dir/sqvm.cpp.o
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:147:85: error: expected expression
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type min() _NOEXCEPT {return type();}
                                                                                    ^
/Users/user/sources/squirrel/squirrel/sqobject.h:131:24: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                       ^
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:148:85: error: expected expression
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type max() _NOEXCEPT {return type();}
                                                                                    ^
/Users/user/sources/squirrel/squirrel/sqobject.h:131:24: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                       ^
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:149:88: error: expected expression
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type lowest() _NOEXCEPT {return type();}
                                                                                       ^
/Users/user/sources/squirrel/squirrel/sqobject.h:131:24: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                       ^
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:158:89: error: expected expression
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type epsilon() _NOEXCEPT {return type();}
                                                                                        ^
/Users/user/sources/squirrel/squirrel/sqobject.h:131:24: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                       ^
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:159:93: error: expected expression
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type round_error() _NOEXCEPT {return type();}
                                                                                            ^
/Users/user/sources/squirrel/squirrel/sqobject.h:131:24: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                       ^
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:171:90: error: expected expression
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type infinity() _NOEXCEPT {return type();}
                                                                                         ^
/Users/user/sources/squirrel/squirrel/sqobject.h:131:24: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                       ^
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:172:91: error: expected expression
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type quiet_NaN() _NOEXCEPT {return type();}
                                                                                          ^
/Users/user/sources/squirrel/squirrel/sqobject.h:131:24: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                       ^
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:173:95: error: expected expression
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type signaling_NaN() _NOEXCEPT {return type();}
                                                                                              ^
/Users/user/sources/squirrel/squirrel/sqobject.h:131:24: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                       ^
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:174:92: error: expected expression
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type denorm_min() _NOEXCEPT {return type();}
                                                                                           ^
/Users/user/sources/squirrel/squirrel/sqobject.h:131:24: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                       ^
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:205:53: error: member reference base type 'int' is not a structure or
      union
    static _LIBCPP_CONSTEXPR const bool is_signed = type(-1) < type(0);
                                                    ^~~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                   ~~~~~^~~~~~
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:205:64: error: member reference base type 'int' is not a structure or
      union
    static _LIBCPP_CONSTEXPR const bool is_signed = type(-1) < type(0);
                                                               ^~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                   ~~~~~^~~~~~
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:210:66: error: member reference base type 'int' is not a structure or
      union
    static _LIBCPP_CONSTEXPR const type __max = is_signed ? type(type(~0) ^ __min) : type(~0);
                                                            ~~~~~^~~~~~~~~~~~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                        ^~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:21: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                    ^~~
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:210:86: error: member reference base type 'int' is not a structure or
      union
    static _LIBCPP_CONSTEXPR const type __max = is_signed ? type(type(~0) ^ __min) : type(~0);
                                                                                     ^~~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                   ~~~~~^~~~~~
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:218:89: error: member reference base type 'int' is not a structure or
      union
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type epsilon() _NOEXCEPT {return type(0);}
                                                                                        ^~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                   ~~~~~^~~~~~
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:219:93: error: member reference base type 'int' is not a structure or
      union
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type round_error() _NOEXCEPT {return type(0);}
                                                                                            ^~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                   ~~~~~^~~~~~
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:231:90: error: member reference base type 'int' is not a structure or
      union
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type infinity() _NOEXCEPT {return type(0);}
                                                                                         ^~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                   ~~~~~^~~~~~
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:232:91: error: member reference base type 'int' is not a structure or
      union
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type quiet_NaN() _NOEXCEPT {return type(0);}
                                                                                          ^~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                   ~~~~~^~~~~~
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:233:95: error: member reference base type 'int' is not a structure or
      union
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type signaling_NaN() _NOEXCEPT {return type(0);}
                                                                                              ^~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                   ~~~~~^~~~~~
In file included from /Users/user/sources/squirrel/squirrel/sqvm.cpp:5:
In file included from /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h:310:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/limits:234:92: error: member reference base type 'int' is not a structure or
      union
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type denorm_min() _NOEXCEPT {return type(0);}
                                                                                           ^~~~~~~
/Users/user/sources/squirrel/squirrel/sqobject.h:131:25: note: expanded from macro 'type'
#define type(obj) ((obj)._type)
                   ~~~~~^~~~~~
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make[2]: *** [squirrel/CMakeFiles/squirrel_static.dir/sqvm.cpp.o] Error 1
make[1]: *** [squirrel/CMakeFiles/squirrel_static.dir/all] Error 2
make: *** [all] Error 2
MacBook-Pro:build user$ clang --version
Apple LLVM version 9.0.0 (clang-900.0.26)
Target: x86_64-apple-darwin17.0.0
Thread model: posix
InstalledDir: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Let me know if you need more info.

When trying to build squirrel 3.1 or 3.2 with -flto -Werror=strict-aliasing enabled (without passing -fno-strict-aliasing) the multiple errors dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] occur (example for quirrel 3.2 with other warnings):

/usr/bin/x86_64-pc-linux-gnu-g++ -D_SQ64 -Dsqstdlib_EXPORTS -I/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/include  -march=core2 -O2 -pipe -fPIC -fno-rtti -fno-exceptions -Wall -Wextra -pedantic -Wcast-qual -flto -Werror=strict-aliasing -O3 -g -std=gnu++11 -MD -MT sqstdlib/CMakeFiles/sqstdlib.dir/sqstdblob.cpp.o -MF sqstdlib/CMakeFiles/sqstdlib.dir/sqstdblob.cpp.o.d -o sqstdlib/CMakeFiles/sqstdlib.dir/sqstdblob.cpp.o -c /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/sqstdlib/sqstdblob.cpp
FAILED: sqstdlib/CMakeFiles/sqstdlib.dir/sqstdblob.cpp.o
/usr/bin/x86_64-pc-linux-gnu-g++ -D_SQ64 -Dsqstdlib_EXPORTS -I/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/include  -march=core2 -O2 -pipe -fPIC -fno-rtti -fno-exceptions -Wall -Wextra -pedantic -Wcast-qual -flto -Werror=strict-aliasing -O3 -g -std=gnu++11 -MD -MT sqstdlib/CMakeFiles/sqstdlib.dir/sqstdblob.cpp.o -MF sqstdlib/CMakeFiles/sqstdlib.dir/sqstdblob.cpp.o.d -o sqstdlib/CMakeFiles/sqstdlib.dir/sqstdblob.cpp.o -c /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/sqstdlib/sqstdblob.cpp
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/sqstdlib/sqstdblob.cpp: In function ‘SQInteger _g_blob_casti2f(HSQUIRRELVM)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/sqstdlib/sqstdblob.cpp:192:22: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  192 |     sq_pushfloat(v,*((const SQFloat *)&i));
      |                     ~^~~~~~~~~~~~~~~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/sqstdlib/sqstdblob.cpp: In function ‘SQInteger _g_blob_castf2i(HSQUIRRELVM)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/sqstdlib/sqstdblob.cpp:200:24: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  200 |     sq_pushinteger(v,*((const SQInteger *)&f));
      |                       ~^~~~~~~~~~~~~~~~~~~~~~
cc1plus: some warnings being treated as errors

/usr/bin/x86_64-pc-linux-gnu-g++ -D_SQ64 -Dsquirrel_EXPORTS -I/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/include  -march=core2 -O2 -pipe -fPIC -fno-rtti -fno-exceptions -Wall -Wextra -pedantic -Wcast-qual -flto -Werror=strict-aliasing -O3 -g -std=gnu++11 -MD -MT squirrel/CMakeFiles/squirrel.dir/sqcompiler.cpp.o -MF squirrel/CMakeFiles/squirrel.dir/sqcompiler.cpp.o.d -o squirrel/CMakeFiles/squirrel.dir/sqcompiler.cpp.o -c /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqcompiler.cpp
FAILED: squirrel/CMakeFiles/squirrel.dir/sqcompiler.cpp.o
/usr/bin/x86_64-pc-linux-gnu-g++ -D_SQ64 -Dsquirrel_EXPORTS -I/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/include  -march=core2 -O2 -pipe -fPIC -fno-rtti -fno-exceptions -Wall -Wextra -pedantic -Wcast-qual -flto -Werror=strict-aliasing -O3 -g -std=gnu++11 -MD -MT squirrel/CMakeFiles/squirrel.dir/sqcompiler.cpp.o -MF squirrel/CMakeFiles/squirrel.dir/sqcompiler.cpp.o.d -o squirrel/CMakeFiles/squirrel.dir/sqcompiler.cpp.o -c /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqcompiler.cpp
In file included from /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqcompiler.cpp:14:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.h: In copy constructor ‘SQExceptionTrap::SQExceptionTrap(const SQExceptionTrap&)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.h:23:60: warning: implicitly-declared ‘SQExceptionTrap& SQExceptionTrap::operator=(const SQExceptionTrap&)’ is deprecated [-Wdeprecated-copy]
   23 |     SQExceptionTrap(const SQExceptionTrap &et) { (*this) = et;  }
      |                                                            ^~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.h:23:5: note: because ‘SQExceptionTrap’ has user-provided ‘SQExceptionTrap::SQExceptionTrap(const SQExceptionTrap&)’
   23 |     SQExceptionTrap(const SQExceptionTrap &et) { (*this) = et;  }
      |     ^~~~~~~~~~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqcompiler.cpp: In member function ‘void SQCompiler::EmitLoadConstFloat(SQFloat, SQInteger)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqcompiler.cpp:896:57: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  896 |             _fs->AddInstruction(_OP_LOADFLOAT, target,*((SQInt32 *)&value));
      |                                                        ~^~~~~~~~~~~~~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqcompiler.cpp: In member function ‘void SQCompiler::ParseTableOrClass(SQInteger, SQInteger)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqcompiler.cpp:1008:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
 1008 |                 if(separator == ',') { //only works for tables
      |                 ^~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqcompiler.cpp:1013:13: note: here
 1013 |             default :
      |             ^~~~~~~
cc1plus: some warnings being treated as errors

/usr/bin/x86_64-pc-linux-gnu-g++ -D_SQ64 -Dsquirrel_EXPORTS -I/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/include  -march=core2 -O2 -pipe -fPIC -fno-rtti -fno-exceptions -Wall -Wextra -pedantic -Wcast-qual -flto -Werror=strict-aliasing -O3 -g -std=gnu++11 -MD -MT squirrel/CMakeFiles/squirrel.dir/sqvm.cpp.o -MF squirrel/CMakeFiles/squirrel.dir/sqvm.cpp.o.d -o squirrel/CMakeFiles/squirrel.dir/sqvm.cpp.o -c /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp
FAILED: squirrel/CMakeFiles/squirrel.dir/sqvm.cpp.o
/usr/bin/x86_64-pc-linux-gnu-g++ -D_SQ64 -Dsquirrel_EXPORTS -I/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/include  -march=core2 -O2 -pipe -fPIC -fno-rtti -fno-exceptions -Wall -Wextra -pedantic -Wcast-qual -flto -Werror=strict-aliasing -O3 -g -std=gnu++11 -MD -MT squirrel/CMakeFiles/squirrel.dir/sqvm.cpp.o -MF squirrel/CMakeFiles/squirrel.dir/sqvm.cpp.o.d -o squirrel/CMakeFiles/squirrel.dir/sqvm.cpp.o -c /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp
In file included from /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:8:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.h: In copy constructor ‘SQExceptionTrap::SQExceptionTrap(const SQExceptionTrap&)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.h:23:60: warning: implicitly-declared ‘SQExceptionTrap& SQExceptionTrap::operator=(const SQExceptionTrap&)’ is deprecated [-Wdeprecated-copy]
   23 |     SQExceptionTrap(const SQExceptionTrap &et) { (*this) = et;  }
      |                                                            ^~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.h:23:5: note: because ‘SQExceptionTrap’ has user-provided ‘SQExceptionTrap::SQExceptionTrap(const SQExceptionTrap&)’
   23 |     SQExceptionTrap(const SQExceptionTrap &et) { (*this) = et;  }
      |     ^~~~~~~~~~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp: In member function ‘bool SQVM::Execute(SQObjectPtr&, SQInteger, SQInteger, SQObjectPtr&, SQBool, SQVM::ExecutionType)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:746:44: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  746 |             case _OP_LOADFLOAT: TARGET = *((const SQFloat *)&arg1); continue;
      |                                           ~^~~~~~~~~~~~~~~~~~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:948:43: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  948 |                     val._unVal.fFloat = *((const SQFloat *)&arg1);
      |                                          ~^~~~~~~~~~~~~~~~~~~~~~~
In file included from /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqobject.h:5,
                 from /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqpcheader.h:17,
                 from /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:4:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/squtils.h: In instantiation of ‘void sqvector<T>::remove(SQUnsignedInteger) [with T = SQObjectPtr; SQUnsignedInteger = long long unsigned int]’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqarray.h:83:23:   required from here
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/squtils.h:97:20: warning: ‘void* memmove(void*, const void*, size_t)’ writing to an object of type ‘struct SQObjectPtr’ with no trivial copy-assignment; use copy-assignment or copy-initialization instead [-Wclass-memaccess]
   97 |             memmove(&_vals[idx], &_vals[idx+1], sizeof(T) * (_size - idx - 1));
      |             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqpcheader.h:17,
                 from /var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:4:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqobject.h:205:8: note: ‘struct SQObjectPtr’ declared here
  205 | struct SQObjectPtr : public SQObject
      |        ^~~~~~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp: In member function ‘bool SQVM::ObjCmp(const SQObjectPtr&, const SQObjectPtr&, SQInteger&)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:236:13: warning: this statement may fall through [-Wimplicit-fallthrough=]
  236 |             }
      |             ^
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:238:9: note: here
  238 |         default:
      |         ^~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp: In member function ‘bool SQVM::ToString(const SQObjectPtr&, SQObjectPtr&)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:317:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
  317 |         }
      |         ^
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:318:5: note: here
  318 |     default:
      |     ^~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp: In member function ‘bool SQVM::FOREACH_OP(SQObjectPtr&, SQObjectPtr&, SQObjectPtr&, SQObjectPtr&, SQInteger, int, int&)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:576:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
  576 |         }
      |         ^
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:577:5: note: here
  577 |     default:
      |     ^~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp: In member function ‘bool SQVM::Execute(SQObjectPtr&, SQInteger, SQInteger, SQObjectPtr&, SQBool, SQVM::ExecutionType)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:825:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
  825 |                       }
      |                       ^
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:826:21: note: here
  826 |                     default:
      |                     ^~~~~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:762:31: warning: this statement may fall through [-Wimplicit-fallthrough=]
  762 |                               }
      |                               ^
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:763:13: note: here
  763 |             case _OP_CALL: {
      |             ^~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp: In member function ‘SQInteger SQVM::FallBackGet(const SQObjectPtr&, const SQObjectPtr&, SQObjectPtr&)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:1338:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
 1338 |         if(_delegable(self)->_delegate) {
      |         ^~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:1345:5: note: here
 1345 |     case OT_INSTANCE: {
      |     ^~~~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp: In member function ‘SQInteger SQVM::FallBackSet(const SQObjectPtr&, const SQObjectPtr&, const SQObjectPtr&)’:
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:1409:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
 1409 |         if(_table(self)->_delegate) {
      |         ^~
/var/tmp/portage/dev-lang/squirrel-3.2/work/squirrel3/squirrel/sqvm.cpp:1413:5: note: here
 1413 |     case OT_INSTANCE:
      |     ^~~~
cc1plus: some warnings being treated as errors

This results in compilation errors where squirrel is used as subproject (see Code::Blocks issue: https://sourceforge.net/p/codeblocks/tickets/1303/).

Steps to reproduce:

1. Patch CmakeLists.txt (example for squirrel 3.2) to provide -flto -Werror=strict-aliasing flags and remove -fno-strict-aliasing:

--- CMakeLists.txt
+++ CMakeLists.txt
@@ -18,11 +18,12 @@
 if(CMAKE_COMPILER_IS_GNUCXX)
   add_compile_options(
     "$<$<COMPILE_LANGUAGE:CXX>:-fno-rtti;-fno-exceptions>"
-    -fno-strict-aliasing
     -Wall
     -Wextra
     -pedantic
     -Wcast-qual
+    -flto
+    -Werror=strict-aliasing
     "$<$<CONFIG:Release>:-O3>"
     "$<$<CONFIG:RelWithDebInfo>:-O3;-g>"
     "$<$<CONFIG:MinSizeRel>:-Os>"

2. Compile in several jobs (or one job but only one of error will appear).
3. Appropriate errors result in compilation failures.

Several distributions are providing a .pc file for squirrel... maybe it could be upstreamed finally :/

prefix=/usr
exec_prefix=/usr
libdir=/usr/lib64
includedir=/usr/include/squirrel

Name: squirrel
Description: squirrel library
Version: 3.2

Requires:
Libs: -L${libdir} -lsquirrel -lsqstdlib
Cflags: -I${includedir}

Thanks

Squirrel is very easy to use~~~

Thanks for the development of @albertodemichelis ! Only after version 3.1 was updated in 2016, there was no news again?

Recently, the new features of C + + 23 standard have been added a lot? Ranges has the most features, and ranges has become the biggest winner. Our question is, can we integrate and bind the ranges syntax above C + + 20 in squirrel? Because it's so convenient to write business code with ranges!

Ranges realizes a variety of parallel combined filtering operations and other operations through pipeline symbols, which should also be the core functional goal of the next generation of squirrel. It not only saves a lot of code, but also greatly increases the flexibility of the algorithm!

In addition, can squirrel support the isolation of multi sub table data and operations? We hope that on the basis of the root table, there can be completely independent sub tables, which can support the same name of objects, and the algorithm can be limited to a certain sub table. C + + 20 provides modules, realizes a high degree of isolation, and even isolates Hongdu? Is there a similar feature in JS? For example, if we declare in the root table and instantiate in different sub tables, the algorithm and object will not be afraid of the problem of duplicate names, and the data will be effectively isolated? In this way, it is convenient to write a large amount of business code.

We are highly optimistic about squirrel and hope @albertodemichelis can give an answer!

thank! thank! thank!

It seems that if we flush stdout before output errors we can have a better idea of where in the script processing flow the error happened, actually when there is an error and the script is outputting to stdout the error message get mixed in the middle of the stdout output but if we flush the stdout then the error message appears after the last stdout output.

Here is a commit that do that for squilu https://github.com/mingodad/squilu/commit/0d1c96d67fd9810244083c96f452a8ab4679bcee