增加module之后报错

[ethanvc]

Xmake 版本

2.7.7

操作系统版本和架构

mac m1 13.2 (22D49)

描述问题

https://github.com/ethanvc/pincpp/blob/main/xmake.lua
当去除注释之后，代码编译不过。错误信息为：

$ xmake b -v protowalker_test
checking for Xcode directory ... %s
checking for Codesign Identity of Xcode ... no
checking for zig ... no
checking for zig ... no
checking for unzip ... /usr/bin/unzip
checking for git ... /usr/bin/git
checking for gzip ... /usr/bin/gzip
checking for tar ... /usr/bin/tar
/usr/bin/git rev-parse HEAD
checking for cmake ... /opt/homebrew/bin/cmake
checking for cmake ... /opt/homebrew/bin/cmake
checking for xmake::protobuf-cpp ... protobuf-cpp 3.19.4
checking for xcrun -sdk macosx clang ... /usr/bin/xcrun -sdk macosx clang
checking for the c++ compiler (cxx) ... xcrun -sdk macosx clang
checking for /usr/bin/xcrun -sdk macosx clang ... ok
checking for flags (-fPIC) ... ok
checking for flags (clang_modules) ... ok
checking for flags (clang_modules_ts) ... ok
[  0%]: generating.module.deps src/pin/protowalker/test/main.cpp
checking for /usr/bin/xcrun -sdk macosx clang-scan-deps ... no
checking for /usr/bin/xcrun -sdk macosx clang-scan-deps ... no
checking for /usr/bin/xcrun -sdk macosx clang-scan-deps ... no
checking for flags (-fvisibility-inlines-hidden) ... ok
checking for flags (-std=c++20) ... ok
checking for flags (-fmodules-ts) ... ok
/usr/bin/xcrun -sdk macosx clang -Qunused-arguments -Isrc -DUSE_MODULES -isystem /Users/.xmake/packages/p/protobuf-cpp/3.19.4/ca58cb917128420887238d241be0bef2/include -E -x c++ src/pin/protowalker/test/main.cpp -o build/.gens/protowalker_test/macosx/arm64/release/rules/modules/cache/ddec0d22/main.cpp.i
In file included from src/pin/protowalker/test/main.cpp:2:
In file included from /Users/.xmake/packages/p/protobuf-cpp/3.19.4/ca58cb917128420887238d241be0bef2/include/google/protobuf/message.h:118:
In file included from /Users/.xmake/packages/p/protobuf-cpp/3.19.4/ca58cb917128420887238d241be0bef2/include/google/protobuf/stubs/casts.h:34:
In file included from /Users/.xmake/packages/p/protobuf-cpp/3.19.4/ca58cb917128420887238d241be0bef2/include/google/protobuf/stubs/common.h:48:
/Users/.xmake/packages/p/protobuf-cpp/3.19.4/ca58cb917128420887238d241be0bef2/include/google/protobuf/stubs/port.h:123:2: error: "Protobuf requires at least C++11."
#error "Protobuf requires at least C++11."
 ^
1 error generated.
error: execv(/usr/bin/xcrun -sdk macosx clang -Qunused-arguments -Isrc -DUSE_MODULES -isystem /Users/.xmake/packages/p/protobuf-cpp/3.19.4/ca58cb917128420887238d241be0bef2/include -E -x c++ src/pin/protowalker/test/main.cpp -o build/.gens/protowalker_test/macosx/arm64/release/rules/modules/cache/ddec0d22/main.cpp.i) failed(1)
warning: ./xmake.lua:9: cannot match add_files("src/pin/protowalker/*.cpp") in target(pincpp)
warning: ./xmake.lua:15: cannot match add_files("src/pin/protowalker/test/*.ixx") in target(protowalker_test)

看起来像是依赖了模块之后，编译选项中丢失了-std=c++20.

期待的结果

可以构建通过。

工程配置

No response

附加信息和错误日志

No response

[waruqi]

目前还不支持 modules 和 protobuf 混用，这是因为 modules 的源码依赖扫描时间点过早，早于 protobuf rule 执行编译

这个目前还在想解决办法，短期内用不了。

#3384

[ethanvc]

ok, thanks. 看来模块的构建还不完善，先不用这个特性了。

[waruqi]

@trunkszi

For different issues, please open a separate issue. and please format your logs with markdown code block.

[24bit-xjkp]

我有一个相关的issue #3873，虽然我没有使用protobuf，但generating的时候依然没有加上-std选项。

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

---

I have a related issue #3873, although I don't use protobuf, I still don't add the -std option when generating.

[hsoul]

╰─$ rm -rf build && xmake clean && xmake f --runtimes=c++_static --toolchain=llvm --sdk=/usr/lib/llvm-19/ && xmake -rv 255 ↵
checking for clang ... /usr/bin/clang
checking for clang ... /usr/lib/llvm-19/bin/clang
checking for the c++ compiler (cxx) ... clang
checking for /usr/lib/llvm-19/bin/clang ... ok
checking for flags (-fPIC) ... ok
checking for flags (clang_modules) ... ok
checking for flags (clang_modules_ts) ... no
checking for /usr/lib/llvm-19/bin/clang ... ok
checking for flags (clang_print_library_module_manifest_path) ... ok
[ 0%]: generating.module.deps test.cpp
[ 0%]: generating.module.deps /usr/lib/llvm-19/bin/../lib/../share/libc++/v1/std.cppm
[ 0%]: generating.module.deps /usr/lib/llvm-19/bin/../lib/../share/libc++/v1/std.compat.cppm
checking for /usr/lib/llvm-19/bin/clang-scan-deps ... no
checking for flags (clang_keep_system_includes) ... ok
checking for flags (-std=c++26) ... ok
/usr/lib/llvm-19/bin/clang -Qunused-arguments -m64 -stdlib=libc++ -cxx-isystem/usr/lib/llvm-19/include/c++/v1 -fkeep-system-includes -E -x c++ test.cpp -o build/.gens/test1/linux/x86_64/release/rules/bmi/cache/modules/3bbb4f22/test.cpp.i
/usr/lib/llvm-19/bin/clang -Qunused-arguments -m64 -stdlib=libc++ -cxx-isystem/usr/lib/llvm-19/include/c++/v1 -fkeep-system-includes -E -x c++ /usr/lib/llvm-19/bin/../lib/../share/libc++/v1/std.cppm -o build/.gens/test1/linux/x86_64/release/rules/bmi/cache/modules/daadce5a/std.cppm.i
/usr/lib/llvm-19/bin/clang -Qunused-arguments -m64 -stdlib=libc++ -cxx-isystem/usr/lib/llvm-19/include/c++/v1 -fkeep-system-includes -E -x c++ /usr/lib/llvm-19/bin/../lib/../share/libc++/v1/std.compat.cppm -o build/.gens/test1/linux/x86_64/release/rules/bmi/cache/modules/daadce5a/std.compat.cppm.i
In file included from /usr/lib/llvm-19/bin/../lib/../share/libc++/v1/std.cppm:222:
/usr/lib/llvm-19/bin/../lib/../share/libc++/v1/std/array.inc:16:22: warning: '<=>' is a single token in C++20; add a space to avoid a change in behavior [-Wc++20-compat]
16 | using std::operator<=>;

I encountered a similar issue where the compilation of module-related files failed due to not specifying the -std=xxx flag during compilation.