在macos下自定义package，自定义toolchain、sdk、ldflags时编译dxc出现链接错误 #4815
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Title: A link error occurs when compiling dxc when customizing the package, toolchain, sdk, and ldflags under macos. |
export LLVM_DIR="/usr/local/opt/llvm";
cmake DirectXShaderCompiler \
-B dxc \
-C DirectXShaderCompiler/cmake/caches/PredefinedParams.cmake \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_C_COMPILER=$LLVM_DIR/bin/clang \
-DCMAKE_CXX_COMPILER=$LLVM_DIR/bin/clang++ \
-DCMAKE_AR=$LLVM_DIR/bin/llvm-ar \
-DCMAKE_LINKER=$LLVM_DIR/bin/llvm-ld \
-DCMAKE_NM=$LLVM_DIR/bin/llvm-nm \
-DCMAKE_OBJDUMP=$LLVM_DIR/bin/llvm-objdump \
-DCMAKE_RANLIB=$LLVM_DIR/bin/llvm-ranlib \
-DCMAKE_SHARED_LINKER_FLAGS="-L/usr/local/opt/llvm/lib/ -L/usr/local/opt/llvm/lib/c++ -Wl -rpath /usr/local/opt/llvm/lib/c++" \
-DCMAKE_EXE_LINKER_FLAGS="-L/usr/local/opt/llvm/lib/ -L/usr/local/opt/llvm/lib/c++ -Wl -rpath /usr/local/opt/llvm/lib/c++" \
-G "Ninja"我自行clone工程，使用以上命令是可以编译成功的，感觉就是 |
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既然自己本地可以，那你对下最后的 link flags ，看下差异。 |
Since you can do it locally, check the last link flags and see the difference. |
这是xmake调用cmake config生成的ninja命令片段 这个是用上面手敲的cmake命令生成的ninja命令片段
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破案了，原来ldflags是针对可执行程序，不包括动态库，还要设置shflags 目前xmake版本是 v2.9.6 自定义llvm工具链并设置ldflags和shflags后就可以正常编译了 toolchain("llvm-macos-brew")
set_kind("standalone")
set_homepage("https://llvm.org/")
set_description("A collection of modular and reusable compiler and toolchain technologies")
set_runtimes("c++_static", "c++_shared", "stdc++_static", "stdc++_shared")
set_sdkdir("/usr/local/opt/llvm")
set_toolset("cc", "clang")
set_toolset("cxx", "clang", "clang++")
set_toolset("mxx", "clang", "clang++")
set_toolset("mm", "clang")
set_toolset("cpp", "clang -E")
set_toolset("as", "clang")
set_toolset("ld", "clang++", "clang")
set_toolset("sh", "clang++", "clang")
set_toolset("ar", "llvm-ar")
set_toolset("strip", "llvm-strip")
set_toolset("ranlib", "llvm-ranlib")
set_toolset("objcopy","llvm-objcopy")
set_toolset("mrc", "llvm-rc")
on_load(function (toolchain)
if toolchain:is_plat("macosx") then
local xcode_dir = get_config("xcode")
local xcode_sdkver = toolchain:config("xcode_sdkver")
local xcode_sdkdir = nil
if xcode_dir and xcode_sdkver then
xcode_sdkdir = xcode_dir .. "/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX" .. xcode_sdkver .. ".sdk"
toolchain:add("cxflags", {"-isysroot", xcode_sdkdir})
toolchain:add("mxflags", {"-isysroot", xcode_sdkdir})
toolchain:add("ldflags", {"-isysroot", xcode_sdkdir})
toolchain:add("shflags", {"-isysroot", xcode_sdkdir})
else
local macsdk = "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk"
if os.exists(macsdk) then
toolchain:add("cxflags", {"-isysroot", macsdk})
toolchain:add("mxflags", {"-isysroot", macsdk})
toolchain:add("ldflags", {"-isysroot", macsdk})
toolchain:add("shflags", {"-isysroot", macsdk})
end
end
toolchain:add("mxflags", "-fobjc-arc")
toolchain:add("ldflags", format("-L%s/lib/", toolchain:sdkdir()))
toolchain:add("ldflags", format("-L%s/lib/c++/", toolchain:sdkdir()))
toolchain:add("ldflags", format("-Wl,-rpath,%s/lib/c++", toolchain:sdkdir()))
toolchain:add("shflags", format("-L%s/lib/", toolchain:sdkdir()))
toolchain:add("shflags", format("-L%s/lib/c++/", toolchain:sdkdir()))
toolchain:add("shflags", format("-Wl,-rpath,%s/lib/c++", toolchain:sdkdir()))
end
end)
toolchain_end()
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Xmake 版本
v2.9.4
操作系统版本和架构
macOS Monterey 12.7.4
描述问题
测试命令：
这台电脑使用brew安装了llvm18工具链，因此测试编译时我传递了 toolchain、sdk和 ldflags 来链接到最新的libc++
但是在编译dxc时，CMAKE_SHARED_LINKER_FLAGS 参数并没有来自ldflags的参数，所以链接时会找不到一些内置函数
下面附加信息里有我这台电脑xmake生成的cmake config命令，可以看到
-DCMAKE_SHARED_LINKER_FLAGS参数内没有ldflag设置的内容，不知道是不是失败的原因期待的结果
在设置ldflags时也可以成功编译
工程配置
附加信息和错误日志
生成的cmake命令
ninja编译报错日志
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