设置工具链为clang遇到的问题

[owllyi]

使用命令行配置：
xmake f -v --cc=clang --cxx=clang++ --ld=clang++ -m debug
可以正确保存工具链为clang，正确编译代码

但是我希望能在xmake.lua里直接设置工具链，不用再执行配置指令，这么写的：
set_tools("cc", "/usr/bin/clang")
set_tools("cxx", "/usr/bin/clang++")
set_tools("ld", "/usr/bin/clang++")

add_rules("mode.debug", "mode.release")

-- add target
target("hello")
-- 之前set_tools放在这里，也不能生效

-- set kind
set_kind("binary")

-- add files
add_files("src/*.cpp") 

直接执行xmake，会默认使用gcc编译，clang++来链接。为什么不是使用clang++编译呢？

请问是不是我设置错了，要如何设置才能在不用调用xmake f配置的情况下，直接可以编译呢？

输出结果：
checking for the architecture ... x86_64
configure
{
plat = linux
arch = x86_64
ccache = true
kind = static
buildir = build
host = linux
mode = release
ndk_stdcxx = true
}
checking for the gcc ... /usr/bin/gcc
checking for the c++ compiler (cxx) ... gcc
checking for the /usr/bin/gcc ... ok
checking for the flags (-O3) ... ok
checking for the ccache ... no
[ 0%]: compiling.release src/main.cpp
/usr/bin/gcc -c -fvisibility=hidden -O3 -m64 -I/usr/local/include -I/usr/include -o build/.objs/hello/linux/x86_64/release/src/main.cpp.o src/main.cpp
checking for the flags (-MMD -MF) ... ok
[100%]: linking.release hello
clang++ -o build/linux/x86_64/release/hello build/.objs/hello/linux/x86_64/release/src/main.cpp.o -s -fvisibility=hidden -m64 -L/usr/local/lib -L/usr/lib

[waruqi]

set_tools这个接口目前设计上是操作整个tools dictionary，所以最后一次set_tools会覆盖之前的整个tools，因为它支持同时设置多个tools，所以你这里最后一个ld的设置，覆盖了之前的Tools设置

set_tools {
    cc = path.join(os.projectdir(), "tools/bin/clang-5.0"),
    mm = path.join(os.projectdir(), "tools/bin/clang-5.0"),
}

因此你这边应该是用add_tools。

你可以详细看下文档：https://xmake.io/#/manual/project_target?id=set-toolchains

关于这块，set_tools设计上确实很容易导致误解，回头我改进下，通过加个 set_toolchain 接口，来更好的处理单个 tool 的设置。。

目前你还是先用add_tools吧，或者使用set_config("cxx", "clang") 也是可以的。。

set_config和set_tools的区别就是，set_config是全局应用默认xmake f 的配置值，全局对所有target生效，而set_tools/add_tools可以对每个Target分别设置不同的值，更加灵活。

[waruqi]

我dev分支上已经加了set_toolchain设置，来逐步代替比较有歧义的set_tools/add_tools，提供更加易理解的方式来设置。你可以更新下试试：xmake update -s dev

set_toolchain("cxx", "clang")
set_toolchain("ld", "clang++")

之前的set_tools/add_tools还是会保留向下兼容几个大版本，文档等发版后我会更新下。。

[owllyi]

感谢支持，我后来实验出来add_tools可以生效，此问题已经解决了。

还有一个问题，我发现xmake生成的so比cmake生成的大了1MB，对比了一下，猜测是自动加上了：-lc++_static -lc++abi 导致的，请问这两个库在哪里设置，可以去掉链接呢，我再测试下so能否变小。

[waruqi]

xmake内部应该没加过这两，你贴下完整编译命令给我看下呢？执行 xmake -v

要么是clang++作为linker自动加的

[owllyi]

[100%]: linking.release libMyLib.so
F:\Android\android-sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang -o build\android\armv7-a\release\libMyLib.so build\.objs\MyLib\android\armv7-a\release\AFile\OBBFILEWrapper.cpp.o build\.objs\MyLib\android\armv7-a\release\ACommon\ALog.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\MyLib_Android.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\BackupPackageHelper.cpp.o build\.objs\MyLib\android\armv7-a\release\Utility\mysscanf.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AWIniFile.cpp.o build\.objs\MyLib\android\armv7-a\release\ACommon\AList.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AScriptFile.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\clPathFile.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\7zIn.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AIniFile.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\logger.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AWScriptFile.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\PackDLL.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\ADirImage.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\clFile.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\VersionMan.cpp.o build\.objs\MyLib\android\armv7-a\release\ACommon\AMemory.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\Base64forPatcher.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AFI.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\clBuffer.cpp.o build\.objs\MyLib\android\armv7-a\release\PathFinder\initdatapool.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Xz.cpp.o build\.objs\MyLib\android\armv7-a\release\Utility\UnityLog.cpp.o build\.objs\MyLib\android\armv7-a\release\PathFinder\PathFinde_map.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Bcj2.cpp.o build\.objs\MyLib\android\armv7-a\release\PathFinder\astar.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\XzIn.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\clstd.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\XzDec.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\XzCrc64.cpp.o build\.objs\MyLib\android\armv7-a\release\.\AngelicaExport.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\ATextTabFile.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Sha256.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Ppmd7Enc.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Ppmd7Dec.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Ppmd7.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\DataPoolBuildTime.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\smartstream.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\LzmaLib.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\LzmaEnc.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\LzmaDec.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Lzma86Dec.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\casemap.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\DataPool.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AFilePackage.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Lzma2Dec.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\LzFind.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Delta.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\CpuArch.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\BraIA64.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Bra86.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Bra.cpp.o build\.objs\MyLib\android\armv7-a\release\PathFinder\PathFinderExport.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\Alloc.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AMemFile.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\7zStream.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\7zFile.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\7zDec.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\ADiskFile.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\7zCrc.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\7zBuf2.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\DataPoolImpl.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\7zBuf.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\7zAlloc.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\utility.cpp.o build\.objs\MyLib\android\armv7-a\release\ACommon\AString.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\patcher.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zDecode\7zCrcOpt.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AFileUnicode.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\GameDataPool.cpp.o build\.objs\MyLib\android\armv7-a\release\ACommon\AWString.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\DataPoolVariable.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AFileImage.cpp.o build\.objs\MyLib\android\armv7-a\release\ACommon\AAssist.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AFile.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\AssetFILEWrapper.cpp.o build\.objs\MyLib\android\armv7-a\release\ACommon\ASysThread.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\DataPoolCompiler.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\Launcher.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\clString.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\clAllocator.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\DataPoolIterator.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\ecvt.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\UnityAssetFILEWrapper.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\ADir.cpp.o build\.objs\MyLib\android\armv7-a\release\DataPool\SmartStock.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\md5base.cpp.o build\.objs\MyLib\android\armv7-a\release\Patcher\7zReader.cpp.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\uncompr.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\inffast.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\inflate.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\zutil.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\compress.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\crc32.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\trees.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\infcodes.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\infutil.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\gzio.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\infblock.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\deflate.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\inftrees.c.o build\.objs\MyLib\android\armv7-a\release\AFile\ZLib\adler32.c.o -llog -landroid -shared -fPIC -mthumb -target armv7-none-linux-androideabi -gcc-toolchain F:\Android\android-sdk\ndk-bundle\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64 --sysroot=F:\Android\android-sdk\ndk-bundle\platforms\android-29/arch-arm -LF:\Android\android-sdk\ndk-bundle\sources\cxx-stl\llvm-libc++/libs/armeabi-v7a -lc++_static -lc++abi

最后一句

[owllyi]

build D$:/Android/patcher/app/build/intermediates/cmake/release/obj/armeabi-v7a/libMyLib.so: CXX_SHARED_LIBRARY_LINKER__MyLib MyLib/ACommon/AAssist.cpp.o MyLib/ACommon/AList.cpp.o MyLib/ACommon/ALog.cpp.o MyLib/ACommon/AMemory.cpp.o MyLib/ACommon/AString.cpp.o MyLib/ACommon/ASysThread.cpp.o MyLib/ACommon/AWString.cpp.o MyLib/AFile/ZLib/adler32.c.o MyLib/AFile/ZLib/compress.c.o MyLib/AFile/ZLib/crc32.c.o MyLib/AFile/ZLib/deflate.c.o MyLib/AFile/ZLib/gzio.c.o MyLib/AFile/ZLib/infblock.c.o MyLib/AFile/ZLib/infcodes.c.o MyLib/AFile/ZLib/inffast.c.o MyLib/AFile/ZLib/inflate.c.o MyLib/AFile/ZLib/inftrees.c.o MyLib/AFile/ZLib/infutil.c.o MyLib/AFile/ZLib/trees.c.o MyLib/AFile/ZLib/uncompr.c.o MyLib/AFile/ZLib/zutil.c.o MyLib/AFile/ADir.cpp.o MyLib/AFile/ADirImage.cpp.o MyLib/AFile/ADiskFile.cpp.o MyLib/AFile/AFI.cpp.o MyLib/AFile/AFile.cpp.o MyLib/AFile/AFileImage.cpp.o MyLib/AFile/AFilePackage.cpp.o MyLib/AFile/AFileUnicode.cpp.o MyLib/AFile/AIniFile.cpp.o MyLib/AFile/AMemFile.cpp.o MyLib/AFile/MyLib_Android.cpp.o MyLib/AFile/AScriptFile.cpp.o MyLib/AFile/AssetFILEWrapper.cpp.o MyLib/AFile/ATextTabFile.cpp.o MyLib/AFile/AWIniFile.cpp.o MyLib/AFile/AWScriptFile.cpp.o MyLib/AFile/OBBFILEWrapper.cpp.o MyLib/AFile/UnityAssetFILEWrapper.cpp.o MyLib/DataPool/casemap.cpp.o MyLib/DataPool/clAllocator.cpp.o MyLib/DataPool/clBuffer.cpp.o MyLib/DataPool/clFile.cpp.o MyLib/DataPool/clPathFile.cpp.o MyLib/DataPool/clstd.cpp.o MyLib/DataPool/clString.cpp.o MyLib/DataPool/DataPool.cpp.o MyLib/DataPool/DataPoolBuildTime.cpp.o MyLib/DataPool/DataPoolCompiler.cpp.o MyLib/DataPool/DataPoolImpl.cpp.o MyLib/DataPool/DataPoolIterator.cpp.o MyLib/DataPool/DataPoolVariable.cpp.o MyLib/DataPool/ecvt.cpp.o MyLib/DataPool/GameDataPool.cpp.o MyLib/DataPool/SmartStock.cpp.o MyLib/DataPool/smartstream.cpp.o MyLib/Patcher/7zDecode/7zAlloc.cpp.o MyLib/Patcher/7zDecode/7zBuf.cpp.o MyLib/Patcher/7zDecode/7zBuf2.cpp.o MyLib/Patcher/7zDecode/7zCrc.cpp.o MyLib/Patcher/7zDecode/7zCrcOpt.cpp.o MyLib/Patcher/7zDecode/7zDec.cpp.o MyLib/Patcher/7zDecode/7zFile.cpp.o MyLib/Patcher/7zDecode/7zIn.cpp.o MyLib/Patcher/7zDecode/7zStream.cpp.o MyLib/Patcher/7zDecode/Alloc.cpp.o MyLib/Patcher/7zDecode/Bcj2.cpp.o MyLib/Patcher/7zDecode/Bra.cpp.o MyLib/Patcher/7zDecode/Bra86.cpp.o MyLib/Patcher/7zDecode/BraIA64.cpp.o MyLib/Patcher/7zDecode/CpuArch.cpp.o MyLib/Patcher/7zDecode/Delta.cpp.o MyLib/Patcher/7zDecode/LzFind.cpp.o MyLib/Patcher/7zDecode/Lzma2Dec.cpp.o MyLib/Patcher/7zDecode/Lzma86Dec.cpp.o MyLib/Patcher/7zDecode/LzmaDec.cpp.o MyLib/Patcher/7zDecode/LzmaEnc.cpp.o MyLib/Patcher/7zDecode/LzmaLib.cpp.o MyLib/Patcher/7zDecode/Ppmd7.cpp.o MyLib/Patcher/7zDecode/Ppmd7Dec.cpp.o MyLib/Patcher/7zDecode/Ppmd7Enc.cpp.o MyLib/Patcher/7zDecode/Sha256.cpp.o MyLib/Patcher/7zDecode/Xz.cpp.o MyLib/Patcher/7zDecode/XzCrc64.cpp.o MyLib/Patcher/7zDecode/XzDec.cpp.o MyLib/Patcher/7zDecode/XzIn.cpp.o MyLib/Patcher/7zReader.cpp.o MyLib/Patcher/BackupPackageHelper.cpp.o MyLib/Patcher/Base64forPatcher.cpp.o MyLib/Patcher/Launcher.cpp.o MyLib/Patcher/logger.cpp.o MyLib/Patcher/md5base.cpp.o MyLib/Patcher/PackDLL.cpp.o MyLib/Patcher/patcher.cpp.o MyLib/Patcher/utility.cpp.o MyLib/Patcher/VersionMan.cpp.o MyLib/PathFinder/astar.cpp.o MyLib/PathFinder/initdatapool.cpp.o MyLib/PathFinder/PathFinde_map.cpp.o MyLib/PathFinder/PathFinderExport.cpp.o MyLib/Utility/mysscanf.cpp.o MyLib/Utility/psnwprintf.c.o MyLib/Utility/UnityLog.cpp.o MyLib/MyLibExport.cpp.o | F$:/Android/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/sysroot/usr/lib/arm-linux-androideabi/16/liblog.so F$:/Android/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/sysroot/usr/lib/arm-linux-androideabi/16/libandroid.so
LANGUAGE_COMPILE_FLAGS = -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -fno-addrsig -march=armv7-a -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -Oz -DNDEBUG -O3 -s
LINK_FLAGS = -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -static-libstdc++ -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--exclude-libs,libunwind.a -Wl,--no-undefined -Qunused-arguments -Wl,-z,noexecstack
LINK_LIBRARIES = -llog -landroid -latomic -lm
OBJECT_DIR = CMakeFiles\MyLib.dir
POST_BUILD = cd .
PRE_LINK = cd .
SONAME = libMyLib.so
SONAME_FLAG = -Wl,-soname,
TARGET_FILE = D:\WORK\OUTLIVED_EngineSVN\Android\patcher\app\build\intermediates\cmake\release\obj\armeabi-v7a\libMyLib.so
TARGET_PDB = MyLib.so.dbg
RSP_FILE = CMakeFiles/MyLib.rsp

这个是cmake生成的ninja工程，编译出来的so为1MB，xmake编译出来的2MB，不知道多出来的是哪部分，能否帮忙看下呢？非常感谢

[owllyi]

对比了一下，应该是cmake默认是用的是libstdc++库，xmake默认使用libc++库。
还没找到方法怎么设置能让xmake使用libstdc++。

add_ldflags("-static-libstdc++")
add_syslinks("atomic","m")

这样也没生效。google的文档中说是需要设置 ANDROID_STL 为 gnustl_static。还没试验成功。

[waruqi]

可以通过 xmake f -p android --ndk_cxxstl=gnustl_static

来切换其他stl ，你可以敲 xmake f --help看下参数说明

[waruqi]

另外cmake 编译我看设置了 -Oz等最小优化编译，所以会很小

你看下xmake.lua里面 release模式启用了没有

add_rules("mode.release", "mode.debug")

设置了xmake内置的release模式编译 这些优化flags也会默认加上

[owllyi]

收到，我加上add_rules("mode.release", "mode.debug")试试看。我自己加了优化的设置可以删除了吧：add_cxflags("-O3","-s")

xmake f -p android --ndk_cxxstl=gnustl_static
这个我设置一下看看

[waruqi]

恩 这些都不需要加 即使加 也应该用 set_optimize("smallest") 尽量不要用cxflags直接加 这样不同编译器需要不同处理

[owllyi]

xmake f -p android --ndk_cxxstl=gnustl_static
使用了这个，编译失败了。估计是头文件目录设置问题。

add_rules("mode.release", "mode.debug") 加上这句之后，so就已经变成1MB大小了。
应该是比自己设置-O3 -s加了更多的优化，裁剪了so尺寸，还没研究明白差异哪里，我再看看。

非常感谢支持，我先把so放到apk里看下运行效果如何。

[waruqi]

xmake f -p android --ndk_cxxstl=gnustl_static
使用了这个，编译失败了。估计是头文件目录设置问题。

这个只是我随手敲的 你还得设置ndk 目录 并且得确保当前ndk版本里面提供了gnu stl，高版本ndk里面应该没有了 只有 llvm c++ stl