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Support for non-CL Clang on Windows #981

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c7a9a92
Fixes to format preprocessing for Clang on Windows
HJfod Feb 5, 2025
2b1f713
Add Clang & Ninja workflow on Windows
HJfod Feb 8, 2025
51f5332
Fix Windows Clang + Ninja action
HJfod Feb 8, 2025
1607d47
Add JS_PRINTF_FORMAT to getopt_compat
HJfod Feb 8, 2025
bb6dfe0
Add missing JS_PRINTF_FORMAT
HJfod Feb 8, 2025
6731454
Fix warnings in quickjs-libc.c & update printf macro in quickjs.h
HJfod Feb 8, 2025
3073f11
Merge branch 'master' of https://github.com/quickjs-ng/quickjs
HJfod Mar 15, 2025
deb2196
Fix Windows Clang build by suppressing CRT warnings
HJfod Mar 15, 2025
f08401e
Fix building with non-CL Clang on Windows
HJfod Mar 15, 2025
de85fe6
More fixes to Windows Clang workflow
HJfod Mar 15, 2025
0ccbeae
Fix outdated name of QJS_BUILD_EXAMPLES option in Windows Clang
HJfod Mar 15, 2025
9529a1b
Remove outdated interrupt test from Windows Clang action
HJfod Mar 15, 2025
e311961
Merge branch 'master' of https://github.com/quickjs-ng/quickjs
HJfod Mar 16, 2025
833f67a
Make changes according to PR code review
HJfod Mar 18, 2025
ebee0ce
Merge branch 'master' of https://github.com/quickjs-ng/quickjs
HJfod May 4, 2025
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35 changes: 34 additions & 1 deletion .github/workflows/ci.yml
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Expand Up @@ -234,7 +234,40 @@ jobs:
cl.exe /DJS_NAN_BOXING=0 /Zs cxxtest.cc
cl.exe /DJS_NAN_BOXING=1 /Zs cxxtest.cc

windows-clang:
windows-ninja-clang:
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Nit, can we call this windows-real-clang perhaps?

runs-on: windows-latest
strategy:
fail-fast: false
matrix:
buildType: [Debug, Release]
steps:
- uses: actions/checkout@v4
- name: install ninja
run: |
choco install ninja
ninja.exe --version
- name: build
run: |
git submodule update --init --checkout --depth 1
cmake -B build -DQJS_BUILD_EXAMPLES=ON -DCMAKE_BUILD_TYPE=${{matrix.buildType}} -DCMAKE_C_COMPILER=clang.exe -G "Ninja"
cmake --build build --config ${{matrix.buildType}}
- name: stats
run: |
build\qjs.exe -qd
- name: cxxtest
run: |
clang.exe -D JS_NAN_BOXING=0 -fsyntax-only cxxtest.cc
clang.exe -D JS_NAN_BOXING=1 -fsyntax-only cxxtest.cc
- name: test
run: |
cp build\fib.dll examples\
cp build\point.dll examples\
build\qjs.exe examples\test_fib.js
build\qjs.exe examples\test_point.js
build\run-test262.exe -c tests.conf
build\function_source.exe

windows-clang-cl:
runs-on: windows-latest
strategy:
fail-fast: false
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9 changes: 8 additions & 1 deletion CMakeLists.txt
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Expand Up @@ -42,6 +42,13 @@ xcheck_add_c_compiler_flag(-Wno-stringop-truncation)
xcheck_add_c_compiler_flag(-Wno-array-bounds)
xcheck_add_c_compiler_flag(-funsigned-char)

# Clang on Windows without MSVC command line fails because the codebase uses
# functions like strcpy over strcpy_s
if(CMAKE_C_COMPILER_ID STREQUAL "Clang" AND WIN32)
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Don't you also want to add NOT MSVC here, so make sure it's not ClangCL ?

add_compile_definitions(_CRT_SECURE_NO_WARNINGS)
add_compile_definitions(_CRT_NONSTDC_NO_DEPRECATE)
endif()
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Suggested change
if(CMAKE_C_COMPILER_ID STREQUAL "Clang" AND WIN32)
add_compile_definitions(_CRT_SECURE_NO_WARNINGS)
add_compile_definitions(_CRT_NONSTDC_NO_DEPRECATE)
endif()
if(CMAKE_C_COMPILER_ID STREQUAL "Clang" AND WIN32)
add_compile_definitions(_CRT_SECURE_NO_WARNINGS)
add_compile_definitions(_CRT_NONSTDC_NO_DEPRECATE)
endif()

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this did not seem to be there or working if the branch was current yesterday. I had to manual #define and also "#pragma warning(disable : 4996)" in several files for MS Clang to compile.

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forget my comment ... I upgraded and compile now with msbuild and the problem is fixed.


# ClangCL is command line compatible with MSVC, so 'MSVC' is set.
if(MSVC)
xcheck_add_c_compiler_flag(-Wno-unsafe-buffer-usage)
Expand Down Expand Up @@ -77,7 +84,7 @@ endif()
if(WIN32)
if(MSVC)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:8388608")
else()
elseif(MINGW)
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Why do you want to skip this on Clang?

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Clang didn't seem to understand the parameter syntax and I couldn't find an equivalent option. Can take another look 👍

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@coreyapowell coreyapowell May 29, 2025 •
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--stack_size
Clang in MS environment doesn't have a clang-gcc program, it has a clang-cpp program. no it's not GCC. In fact It does not carry the MSVC flag, it carries the WIN32 flag but MSYS2 Clang carries WIN32 as well. I don't think there's a special flag.
so what I did was if (msvc) elseif (GNU) else () .. doesn't seem to see Clang on my end!
Correction:. Clang knows nothing about GCC or GNU. in MSYS2 Clang responds to MINGW.
There may be something intermittent about how Clang responds to flags. I ended up reinstalling my build systems more than once, trying to reproduce a bug; if Ninja is installed a certain way in MSYS2 (the way that WinLibs does it). I verified that Clang will lose the WIN32 flag.

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@coreyapowell coreyapowell May 30, 2025 •
edited
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I was wrong. --stack_size is clang on mac. there's no stack size in MS version and I don't think there is in linux. What it does do is ignore the flag --stack_size and not --stack, and I get 140 warnings and don't see it.
oh and just fyi .. I reinstalled my build environments for clang and the flags completely change between ninja, make, and msbuild. so that section acts differently. I've seen 4 different flagsets today. but I have no 'Clang' flag in MSYS or MSVC. Clang in the MINGW environment gives no WIN32 flag. if someone uses WinLibs, I bet this flag isn't even there.

set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,8388608")
endif()
endif()
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3 changes: 2 additions & 1 deletion cutils.h
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Expand Up @@ -102,7 +102,8 @@ extern "C" {

/* Borrowed from Folly */
#ifndef JS_PRINTF_FORMAT
#ifdef _MSC_VER
/* Clang on Windows doesn't seem to support _Printf_format_string_ */
#if defined(_MSC_VER) && !defined(__clang__)
#include <sal.h>
#define JS_PRINTF_FORMAT _Printf_format_string_
#define JS_PRINTF_FORMAT_ATTR(format_param, dots_param)
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6 changes: 4 additions & 2 deletions getopt_compat.h
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Expand Up @@ -68,6 +68,8 @@
#include <stdarg.h>
#include <stdio.h>
#include <windows.h>
/* Required for JS_PRINTF_FORMAT */
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Can we not do this and silence the warnings if need be? I actually want to get rid of this header altogether by parsing command line arguments by hand in qjsc, since it's only used there...

#include "cutils.h"

#ifdef __cplusplus
extern "C" {
Expand Down Expand Up @@ -145,7 +147,7 @@ static const char illoptchar[] = "unknown option -- %c";
static const char illoptstring[] = "unknown option -- %s";

static void
_vwarnx(const char *fmt,va_list ap)
JS_PRINTF_FORMAT_ATTR(1, 0) _vwarnx(JS_PRINTF_FORMAT const char *fmt,va_list ap)
{
(void)fprintf(stderr,"%s: ",__progname);
if (fmt != NULL)
Expand All @@ -154,7 +156,7 @@ _vwarnx(const char *fmt,va_list ap)
}

static void
warnx(const char *fmt,...)
JS_PRINTF_FORMAT_ATTR(1, 2) warnx(JS_PRINTF_FORMAT const char *fmt,...)
{
va_list ap;
va_start(ap,fmt);
Expand Down
8 changes: 4 additions & 4 deletions quickjs-libc.c
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Expand Up @@ -198,10 +198,10 @@ static void js_set_thread_state(JSRuntime *rt, JSThreadState *ts)
js_std_cmd(/*SetOpaque*/1, rt, ts);
}

#ifdef __GNUC__
#if defined(__GNUC__) || defined(__clang__)
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Doesn't clang-on-windows define __GNUC__? Because clang-on-linux definitely does:

$ clang -E -dM - < /dev/null | grep GNUC
#define __GNUC_MINOR__ 2
#define __GNUC_PATCHLEVEL__ 1
#define __GNUC_STDC_INLINE__ 1
#define __GNUC__ 4

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I believe it does too. What are you trying to fix here @HJfod ?

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image
Removing the defined(__clang__) check makes it not work, so seems like Clang doesn't define __GNUC__

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif // __GNUC__
#endif // __GNUC__ || __clang__
static JSValue js_printf_internal(JSContext *ctx,
int argc, JSValueConst *argv, FILE *fp)
{
Expand Down Expand Up @@ -417,9 +417,9 @@ static JSValue js_printf_internal(JSContext *ctx,
dbuf_free(&dbuf);
return JS_EXCEPTION;
}
#ifdef __GNUC__
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic pop // ignored "-Wformat-nonliteral"
#endif // __GNUC__
#endif // __GNUC__ || __clang__

uint8_t *js_load_file(JSContext *ctx, size_t *pbuf_len, const char *filename)
{
Expand Down
4 changes: 2 additions & 2 deletions quickjs.c
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Expand Up @@ -6985,7 +6985,7 @@ static int JS_PRINTF_FORMAT_ATTR(3, 4) JS_ThrowTypeErrorOrFalse(JSContext *ctx,
}
}

#ifdef __GNUC__
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif // __GNUC__
Expand All @@ -7002,7 +7002,7 @@ static JSValue JS_ThrowSyntaxErrorAtom(JSContext *ctx, const char *fmt, JSAtom a
JS_AtomGetStr(ctx, buf, sizeof(buf), atom);
return JS_ThrowSyntaxError(ctx, fmt, buf);
}
#ifdef __GNUC__
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic pop // ignored "-Wformat-nonliteral"
#endif // __GNUC__

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2 changes: 1 addition & 1 deletion quickjs.h
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Expand Up @@ -49,7 +49,7 @@ extern "C" {

/* Borrowed from Folly */
#ifndef JS_PRINTF_FORMAT
#ifdef _MSC_VER
#if defined(_MSC_VER) && !defined(__clang__)
#include <sal.h>
#define JS_PRINTF_FORMAT _Printf_format_string_
#define JS_PRINTF_FORMAT_ATTR(format_param, dots_param)
Expand Down