About compiling AHK with GCC, the only info I found is 11 years old post:
https://autohotkey.com/board/topic/28748-compiling-with-gcc/
So many things changed since then. Links r dead. I see absolutely different errors flying by.

errors
Is here anybody who tried to compile AHK L v2 with GCC recently?In file included from X:/GCC/x86_64-w64-mingw32/include/combaseapi.h:154:0,
from X:/GCC/x86_64-w64-mingw32/include/objbase.h:14,
from X:/GCC/x86_64-w64-mingw32/include/ole2.h:17,
from X:/GCC/x86_64-w64-mingw32/include/wtypesbase.h:12,
from X:/GCC/x86_64-w64-mingw32/include/shlobj.h:9,
from r:\ahk\source\stdafx.h:61,
from r:\ahk\source\AutoHotkey.cpp:17:
X:/GCC/x86_64-w64-mingw32/include/unknwnbase.h: In member function 'HRESULT IUnknown::QueryInterface(Q**)':
X:/GCC/x86_64-w64-mingw32/include/unknwnbase.h:74:39: error: expected primary-expression before ')' token
return QueryInterface(__uuidof(Q), (void **)pp);
^
In file included from X:/GCC/x86_64-w64-mingw32/include/urlmon.h:289:0,
from X:/GCC/x86_64-w64-mingw32/include/objbase.h:163,
from X:/GCC/x86_64-w64-mingw32/include/ole2.h:17,
from X:/GCC/x86_64-w64-mingw32/include/wtypesbase.h:12,
from X:/GCC/x86_64-w64-mingw32/include/shlobj.h:9,
from r:\ahk\source\stdafx.h:61,
from r:\ahk\source\AutoHotkey.cpp:17:
X:/GCC/x86_64-w64-mingw32/include/servprov.h: In member function 'HRESULT IServiceProvider::QueryService(const GUID&, Q**)':
X:/GCC/x86_64-w64-mingw32/include/servprov.h:66:46: error: expected primary-expression before ')' token
return QueryService(guidService, __uuidof(Q), (void **)pp);
^
In file included from r:\ahk\source\keyboard_mouse.h:20:0,
from r:\ahk\source\hotkey.h:20,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\defines.h: At global scope:
r:\ahk\source\defines.h:388:6: error: use of enum 'BuiltInFunctionID' without previous declaration
enum BuiltInFunctionID;
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::Append(LPTSTR, size_t)':
r:\ahk\source\script_object.h:248:106: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
bool Append(LPTSTR aValue, size_t aValueLength = -1) { return Append(ExprTokenType(aValue, aValueLength)); }
^
r:\ahk\source\script_object.h:247:7: note: initializing argument 1 of 'bool Object::Append(ExprTokenType&)'
bool Append(ExprTokenType &aValue);
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::Append(long long int)':
r:\ahk\source\script_object.h:249:66: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
bool Append(__int64 aValue) { return Append(ExprTokenType(aValue)); }
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h:247:7: note: initializing argument 1 of 'bool Object::Append(ExprTokenType&)'
bool Append(ExprTokenType &aValue);
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::SetItem(LPTSTR, ExprTokenType&)':
r:\ahk\source\script_object.h:313:45: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
return SetItem(ExprTokenType(aKey), aValue);
^
r:\ahk\source\script_object.h:299:7: note: initializing argument 1 of 'bool Object::SetItem(ExprTokenType&, ExprTokenType&)'
bool SetItem(ExprTokenType &aKey, ExprTokenType &aValue)
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::SetItem(LPTSTR, long long int)':
r:\ahk\source\script_object.h:318:45: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
return SetItem(aKey, ExprTokenType(aValue));
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h:311:7: note: initializing argument 2 of 'bool Object::SetItem(LPTSTR, ExprTokenType&)'
bool SetItem(LPTSTR aKey, ExprTokenType &aValue)
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::SetItem(LPTSTR, IObject*)':
r:\ahk\source\script_object.h:323:45: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
return SetItem(aKey, ExprTokenType(aValue));
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h:311:7: note: initializing argument 2 of 'bool Object::SetItem(LPTSTR, ExprTokenType&)'
bool SetItem(LPTSTR aKey, ExprTokenType &aValue)
^
In file included from r:\ahk\source\hotkey.h:21:0,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script.h: In member function 'bool Func::ArgIsOutputVar(int)':
r:\ahk\source\script.h:1715:16: error: 'BIF_PerformAction' was not declared in this scope
if (mBIF == &BIF_PerformAction)
^
In file included from r:\ahk\source\hotkey.h:21:0,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script.h: In constructor 'Func::Func(LPTSTR, bool)':
r:\ahk\source\script.h:1803:2: error: initializations for multiple members of 'Func::<anonymous union>'
Func(LPTSTR aFuncName, bool aIsBuiltIn) // Constructor.
^
In file included from r:\ahk\source\AutoHotkey.cpp:21:0:
r:\ahk\source\TextIO.h: In member function 'long long int TextFile::Length(long long int)':
r:\ahk\source\TextIO.h:299:25: error: 'min' was not declared in this scope
_Seek(min(aLength, pos), SEEK_SET);
^
from X:/GCC/x86_64-w64-mingw32/include/objbase.h:14,
from X:/GCC/x86_64-w64-mingw32/include/ole2.h:17,
from X:/GCC/x86_64-w64-mingw32/include/wtypesbase.h:12,
from X:/GCC/x86_64-w64-mingw32/include/shlobj.h:9,
from r:\ahk\source\stdafx.h:61,
from r:\ahk\source\AutoHotkey.cpp:17:
X:/GCC/x86_64-w64-mingw32/include/unknwnbase.h: In member function 'HRESULT IUnknown::QueryInterface(Q**)':
X:/GCC/x86_64-w64-mingw32/include/unknwnbase.h:74:39: error: expected primary-expression before ')' token
return QueryInterface(__uuidof(Q), (void **)pp);
^
In file included from X:/GCC/x86_64-w64-mingw32/include/urlmon.h:289:0,
from X:/GCC/x86_64-w64-mingw32/include/objbase.h:163,
from X:/GCC/x86_64-w64-mingw32/include/ole2.h:17,
from X:/GCC/x86_64-w64-mingw32/include/wtypesbase.h:12,
from X:/GCC/x86_64-w64-mingw32/include/shlobj.h:9,
from r:\ahk\source\stdafx.h:61,
from r:\ahk\source\AutoHotkey.cpp:17:
X:/GCC/x86_64-w64-mingw32/include/servprov.h: In member function 'HRESULT IServiceProvider::QueryService(const GUID&, Q**)':
X:/GCC/x86_64-w64-mingw32/include/servprov.h:66:46: error: expected primary-expression before ')' token
return QueryService(guidService, __uuidof(Q), (void **)pp);
^
In file included from r:\ahk\source\keyboard_mouse.h:20:0,
from r:\ahk\source\hotkey.h:20,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\defines.h: At global scope:
r:\ahk\source\defines.h:388:6: error: use of enum 'BuiltInFunctionID' without previous declaration
enum BuiltInFunctionID;
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::Append(LPTSTR, size_t)':
r:\ahk\source\script_object.h:248:106: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
bool Append(LPTSTR aValue, size_t aValueLength = -1) { return Append(ExprTokenType(aValue, aValueLength)); }
^
r:\ahk\source\script_object.h:247:7: note: initializing argument 1 of 'bool Object::Append(ExprTokenType&)'
bool Append(ExprTokenType &aValue);
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::Append(long long int)':
r:\ahk\source\script_object.h:249:66: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
bool Append(__int64 aValue) { return Append(ExprTokenType(aValue)); }
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h:247:7: note: initializing argument 1 of 'bool Object::Append(ExprTokenType&)'
bool Append(ExprTokenType &aValue);
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::SetItem(LPTSTR, ExprTokenType&)':
r:\ahk\source\script_object.h:313:45: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
return SetItem(ExprTokenType(aKey), aValue);
^
r:\ahk\source\script_object.h:299:7: note: initializing argument 1 of 'bool Object::SetItem(ExprTokenType&, ExprTokenType&)'
bool SetItem(ExprTokenType &aKey, ExprTokenType &aValue)
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::SetItem(LPTSTR, long long int)':
r:\ahk\source\script_object.h:318:45: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
return SetItem(aKey, ExprTokenType(aValue));
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h:311:7: note: initializing argument 2 of 'bool Object::SetItem(LPTSTR, ExprTokenType&)'
bool SetItem(LPTSTR aKey, ExprTokenType &aValue)
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h: In member function 'bool Object::SetItem(LPTSTR, IObject*)':
r:\ahk\source\script_object.h:323:45: error: invalid initialization of non-const reference of type 'ExprTokenType&' from an rvalue of type 'ExprTokenType'
return SetItem(aKey, ExprTokenType(aValue));
^
In file included from r:\ahk\source\script.h:28:0,
from r:\ahk\source\hotkey.h:21,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script_object.h:311:7: note: initializing argument 2 of 'bool Object::SetItem(LPTSTR, ExprTokenType&)'
bool SetItem(LPTSTR aKey, ExprTokenType &aValue)
^
In file included from r:\ahk\source\hotkey.h:21:0,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script.h: In member function 'bool Func::ArgIsOutputVar(int)':
r:\ahk\source\script.h:1715:16: error: 'BIF_PerformAction' was not declared in this scope
if (mBIF == &BIF_PerformAction)
^
In file included from r:\ahk\source\hotkey.h:21:0,
from r:\ahk\source\hook.h:20,
from r:\ahk\source\globaldata.h:20,
from r:\ahk\source\AutoHotkey.cpp:18:
r:\ahk\source\script.h: In constructor 'Func::Func(LPTSTR, bool)':
r:\ahk\source\script.h:1803:2: error: initializations for multiple members of 'Func::<anonymous union>'
Func(LPTSTR aFuncName, bool aIsBuiltIn) // Constructor.
^
In file included from r:\ahk\source\AutoHotkey.cpp:21:0:
r:\ahk\source\TextIO.h: In member function 'long long int TextFile::Length(long long int)':
r:\ahk\source\TextIO.h:299:25: error: 'min' was not declared in this scope
_Seek(min(aLength, pos), SEEK_SET);
^
Moderators Note: Split to a seperate topic nnnik