I’m trying to get Clang working with Code::Blocks.
I’ve installed CodeBlocks 20.03 with MinGW, LLVM 14.0.0-win64, Visual Studio 2022, and the latest WinSDK. All are in sub-folders of E:\Compilers\
My toolchain executables are:
- C Compiler: clang.exe
- C++ Compiler: clang++.exe
- Linker for dynamic libs: clang++.exe
- Linker for static libs: llvm-ar.exe
- Debugger: GDB/CDB debugger: Default
- Resource compiler: llvm-rc.exe
- Make program: mingw32-make.exe
Search directories for the complier has a path to the Visual Studio’s include directory.
When I try building a basic console-only “Hello World” program, it builds successfully. But when I try building a basic Windows application (one that just instantiates a window with a window proc) it errors with the following build output:
-------------- Build: Debug in TestWinClang (compiler: LLVM Clang Compiler)---------------
clang++.exe -Weverything -m64 -g -v -fomit-frame-pointer -Wnon-virtual-dtor -Wbind-to-temporary-copy -Wextra-tokens -std=c++17 -IE:\Compilers\VisualStudio\VC\Tools\MSVC\14.31.31103\include -c E:\Development\TestWinClang\main.cpp -o obj\Debug\main.o
clang++.exe -o bin\Debug\TestWinClang.exe obj\Debug\main.o -m64 -lgdi32 -luser32 -lkernel32 -lcomctl32 -Wl,--subsystem,windows
clang version 14.0.0
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: E:\Compilers\LLVM\bin
(in-process)
"E:\\Compilers\\LLVM\\bin\\clang++.exe" -cc1 -triple x86_64-pc-windows-msvc19.31.31107 -emit-obj -mrelax-all -mincremental-linker-compatible --mrelax-relocations -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name main.cpp -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -mllvm -treat-scalable-fixed-error-as-warning -gno-column-info -gcodeview -debug-info-kind=constructor -v "-fcoverage-compilation-dir=E:\\Development\\TestWinClang" -resource-dir "E:\\Compilers\\LLVM\\lib\\clang\\14.0.0" -I "E:\\Compilers\\VisualStudio\\VC\\Tools\\MSVC\\14.31.31103\\include" -internal-isystem "E:\\Compilers\\LLVM\\lib\\clang\\14.0.0\\include" -internal-isystem "E:\\Compilers\\VisualStudio\\VC\\Tools\\MSVC\\14.31.31103\\include" -internal-isystem "E:\\Compilers\\VisualStudio\\VC\\Tools\\MSVC\\14.31.31103\\atlmfc\\include" -internal-isystem "E:\\Compilers\\WinSDK\\Include\\10.0.22000.0\\ucrt" -internal-isystem "E:\\Compilers\\WinSDK\\Include\\10.0.22000.0\\shared" -internal-isystem "E:\\Compilers\\WinSDK\\Include\\10.0.22000.0\\um" -internal-isystem "E:\\Compilers\\WinSDK\\Include\\10.0.22000.0\\winrt" -internal-isystem "E:\\Compilers\\WinSDK\\Include\\10.0.22000.0\\cppwinrt" -Weverything -Wnon-virtual-dtor -Wbind-to-temporary-copy -Wextra-tokens -std=c++17 -fdeprecated-macro "-fdebug-compilation-dir=E:\\Development\\TestWinClang" -ferror-limit 19 -fno-use-cxa-atexit -fms-extensions -fms-compatibility -fms-compatibility-version=19.31.31107 -fdelayed-template-parsing -fcxx-exceptions -fexceptions -faddrsig -o "obj\\Debug\\main.o" -x c++ "E:\\Development\\TestWinClang\\main.cpp"
clang -cc1 version 14.0.0 based upon LLVM 14.0.0 default target x86_64-pc-windows-msvc
ignoring duplicate directory "E:\Compilers\VisualStudio\VC\Tools\MSVC\14.31.31103\include"
as it is a non-system directory that duplicates a system directory
#include "..." search starts here:
#include <...> search starts here:
E:\Compilers\LLVM\lib\clang\14.0.0\include
E:\Compilers\VisualStudio\VC\Tools\MSVC\14.31.31103\include
E:\Compilers\VisualStudio\VC\Tools\MSVC\14.31.31103\atlmfc\include
E:\Compilers\WinSDK\Include\10.0.22000.0\ucrt
E:\Compilers\WinSDK\Include\10.0.22000.0\shared
E:\Compilers\WinSDK\Include\10.0.22000.0\um
E:\Compilers\WinSDK\Include\10.0.22000.0\winrt
E:\Compilers\WinSDK\Include\10.0.22000.0\cppwinrt
End of search list.
E:\Development\TestWinClang\main.cpp:8:10: warning: non-portable path to file '<Windows.h>'; specified path differs in case from file name on disk [-Wnonportable-system-include-path]
#include <windows.h>
^~~~~~~~~~~
<Windows.h>
E:\Development\TestWinClang\main.cpp:14:7: warning: no previous extern declaration for non-static variable 'szClassName' [-Wmissing-variable-declarations]
TCHAR szClassName[ ] = _T("CodeBlocksWindowsApp");
^
E:\Development\TestWinClang\main.cpp:14:1: note: declare 'static' if the variable is not intended to be used outside of this translation unit
TCHAR szClassName[ ] = _T("CodeBlocksWindowsApp");
^
E:\Development\TestWinClang\main.cpp:33:29: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant]
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
^~~~
nullptr
E:\Compilers\LLVM\lib\clang\14.0.0\include\stddef.h:86:18: note: expanded from macro 'NULL'
# define NULL 0
^
E:\Development\TestWinClang\main.cpp:34:31: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant]
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
^~~~
nullptr
E:\Compilers\LLVM\lib\clang\14.0.0\include\stddef.h:86:18: note: expanded from macro 'NULL'
# define NULL 0
^
E:\Development\TestWinClang\main.cpp:35:33: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant]
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
^~~~
nullptr
E:\Compilers\LLVM\lib\clang\14.0.0\include\stddef.h:86:18: note: expanded from macro 'NULL'
# define NULL 0
^
E:\Development\TestWinClang\main.cpp:36:26: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant]
wincl.lpszMenuName = NULL; /* No menu */
^~~~
nullptr
E:\Compilers\LLVM\lib\clang\14.0.0\include\stddef.h:86:18: note: expanded from macro 'NULL'
# define NULL 0
^
E:\Development\TestWinClang\main.cpp:40:27: warning: use of old-style cast [-Wold-style-cast]
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
^ ~~~~~~~~~~~~~~~~
E:\Development\TestWinClang\main.cpp:57:12: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant]
NULL, /* No menu */
^~~~
nullptr
E:\Compilers\LLVM\lib\clang\14.0.0\include\stddef.h:86:18: note: expanded from macro 'NULL'
# define NULL 0
^
E:\Development\TestWinClang\main.cpp:59:12: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant]
NULL /* No Window Creation data */
^~~~
nullptr
E:\Compilers\LLVM\lib\clang\14.0.0\include\stddef.h:86:18: note: expanded from macro 'NULL'
# define NULL 0
^
E:\Development\TestWinClang\main.cpp:66:35: warning: zero as null pointer constant [-Wzero-as-null-pointer-constant]
while (GetMessage (&messages, NULL, 0, 0))
^~~~
nullptr
E:\Compilers\LLVM\lib\clang\14.0.0\include\stddef.h:86:18: note: expanded from macro 'NULL'
# define NULL 0
^
E:\Development\TestWinClang\main.cpp:17:32: warning: unused parameter 'hPrevInstance' [-Wunused-parameter]
HINSTANCE hPrevInstance,
^
E:\Development\TestWinClang\main.cpp:18:28: warning: unused parameter 'lpszArgument' [-Wunused-parameter]
LPSTR lpszArgument,
^
E:\Development\TestWinClang\main.cpp:75:21: warning: implicit conversion loses integer precision: 'WPARAM' (aka 'unsigned long long') to 'int' [-Wshorten-64-to-32]
return messages.wParam;
~~~~~~ ~~~~~~~~~^~~~~~
13 warnings generated.
clang++: error: linker command failed with exit code 1181 (use -v to see invocation)
LINK : warning LNK4044: unrecognized option '/-subsystem'; ignored
LINK : fatal error LNK1181: cannot open input file 'windows.obj'
Process terminated with status 1181 (0 minute(s), 3 second(s))
1 error(s), 13 warning(s) (0 minute(s), 3 second(s))
Why is it even looking for a windows.obj? There is no windows.cpp. Any help getting this working would be appreciated.
The cpp source code for the project is:
#include <tchar.h>
#include <windows.h>
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
/* Make the class name into a global variable */
TCHAR szClassName[ ] = _T("CodeBlocksWindowsApp");
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
_T("Code::Blocks Template Windows App"), /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}