C++ newly added module import not being found

[ilobilo]

Xmake Version

2.9.5

Operating System Version and Architecture

Fedora KDE 40

Describe Bug

I have an issue when newly imported C++ modules are not being found (so adding import existing_module; to a source file). but if I do a clean rebuild with xmake clean --all and xmake build, no errors are thrown

Expected Behavior

finds the available modules

Project Configuration

compiles modules normally, nothing special

Additional Information and Error Logs

nope

[waruqi]

Can you provide an example? and logs?

[ilobilo]

let's say that the following compiles fine:
main.cpp

import one;
import two;

int main()
{
    onefunc();
    twofunc();
    return 0;
}

one.cppm

export module one;
export void onefunc() { }

two.cppm

export module two;
export void twofunc() { }

now, if I modify two.cppm to this:

export module two;
import one;
export void twofunc() { onefunc(); }

I get an error about module one not being found. If I run xmake clean --all and xmake build, then it compiles. I believe Arthapz in the discord server said that this was a known issue.

error: two.cppm:2:8: fatal error: module 'one' not found
2 | import one;
| ~~~~~~~^~~~~~
1 error generated.

[waruqi]

it works for me.

ruki-2:test ruki$ xmake f --toolchain=llvm -c
checking for platform ... macosx
checking for architecture ... x86_64
checking for Xcode directory ... /Applications/Xcode.app
checking for SDK version of Xcode for macosx (x86_64) ... 14.0
ruki-2:test ruki$ xmake -rv
checking for flags (clang_print_library_module_manifest_path) ... no
[  0%]: <hello> generating.module.deps src/main.cpp
[  0%]: <hello> generating.module.deps src/one.cppm
[  0%]: <hello> generating.module.deps src/two.cppm
[  0%]: <hello> generating.module.deps /usr/local/Cellar/llvm/18.1.5/bin/../lib/c++/../../share/l
ibc++/v1/std.cppm
[  0%]: <hello> generating.module.deps /usr/local/Cellar/llvm/18.1.5/bin/../lib/c++/../../share/l
ibc++/v1/std.compat.cppm
checking for /usr/local/Cellar/llvm/18.1.5/bin/clang-scan-deps ... ok
checking for flags (-fvisibility-inlines-hidden) ... ok
checking for flags (-O3) ... ok
checking for flags (-std=c++20) ... ok
checking for flags (-DNDEBUG) ... ok
/usr/local/Cellar/llvm/18.1.5/bin/clang-scan-deps --format=p1689 -- /usr/local/Cellar/llvm/18.1.5
/bin/clang -x c++ -c src/main.cpp -o build/.objs/hello/macosx/x86_64/release/src/main.cpp.o -Qunu
sed-arguments -m64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform
/Developer/SDKs/MacOSX14.0.sdk -fvisibility=hidden -fvisibility-inlines-hidden -O3 -std=c++20 -DN
DEBUG
/usr/local/Cellar/llvm/18.1.5/bin/clang-scan-deps --format=p1689 -- /usr/local/Cellar/llvm/18.1.5
/bin/clang -x c++ -c src/two.cppm -o build/.objs/hello/macosx/x86_64/release/src/two.cppm.o -Qunu
sed-arguments -m64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform
/Developer/SDKs/MacOSX14.0.sdk -fvisibility=hidden -fvisibility-inlines-hidden -O3 -std=c++20 -DN
DEBUG
/usr/local/Cellar/llvm/18.1.5/bin/clang-scan-deps --format=p1689 -- /usr/local/Cellar/llvm/18.1.5
/bin/clang -x c++ -c /usr/local/Cellar/llvm/18.1.5/bin/../lib/c++/../../share/libc++/v1/std.cppm
-o build/.objs/hello/macosx/x86_64/release/usr/local/Cellar/llvm/18.1.5/bin/__/lib/c++/__/__/shar
e/libc++/v1/std.cppm.o -Qunused-arguments -m64 -isysroot /Applications/Xcode.app/Contents/Develop
er/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.0.sdk -fvisibility=hidden -fvisibility-inlin
es-hidden -O3 -std=c++20 -DNDEBUG
/usr/local/Cellar/llvm/18.1.5/bin/clang-scan-deps --format=p1689 -- /usr/local/Cellar/llvm/18.1.5
/bin/clang -x c++ -c /usr/local/Cellar/llvm/18.1.5/bin/../lib/c++/../../share/libc++/v1/std.compa
t.cppm -o build/.objs/hello/macosx/x86_64/release/usr/local/Cellar/llvm/18.1.5/bin/__/lib/c++/__/
__/share/libc++/v1/std.compat.cppm.o -Qunused-arguments -m64 -isysroot /Applications/Xcode.app/Co
ntents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.0.sdk -fvisibility=hidden -fvi
sibility-inlines-hidden -O3 -std=c++20 -DNDEBUG
/usr/local/Cellar/llvm/18.1.5/bin/clang-scan-deps --format=p1689 -- /usr/local/Cellar/llvm/18.1.5
/bin/clang -x c++ -c src/one.cppm -o build/.objs/hello/macosx/x86_64/release/src/one.cppm.o -Qunu
sed-arguments -m64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform
/Developer/SDKs/MacOSX14.0.sdk -fvisibility=hidden -fvisibility-inlines-hidden -O3 -std=c++20 -DN
DEBUG
[ 37%]: <hello> compiling.module.release two
[ 50%]: <hello> compiling.module.release one
checking for flags (clang_module_output) ... ok
/usr/local/Cellar/llvm/18.1.5/bin/clang -c -Qunused-arguments -m64 -isysroot /Applications/Xcode.
app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.0.sdk -fvisibility=hidde
n -fvisibility-inlines-hidden -O3 -std=c++20 -DNDEBUG -x c++-module -fmodule-output=build/.gens/h
ello/macosx/x86_64/release/rules/bmi/cache/modules/c83caa2b/two.pcm -o build/.objs/hello/macosx/x
86_64/release/src/two.cppm.o src/two.cppm
checking for flags (-fdiagnostics-color=always) ... ok
/usr/local/Cellar/llvm/18.1.5/bin/clang -c -Qunused-arguments -m64 -isysroot /Applications/Xcode.
app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.0.sdk -fvisibility=hidde
n -fvisibility-inlines-hidden -O3 -std=c++20 -DNDEBUG -x c++-module -fmodule-output=build/.gens/h
ello/macosx/x86_64/release/rules/bmi/cache/modules/c83caa2b/one.pcm -o build/.objs/hello/macosx/x
86_64/release/src/one.cppm.o src/one.cppm
checking for flags (clang_module_file) ... ok
[ 75%]: compiling.release src/main.cpp
/usr/local/Cellar/llvm/18.1.5/bin/clang -c -Qunused-arguments -m64 -isysroot /Applications/Xcode.
app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.0.sdk -fvisibility=hidde
n -fvisibility-inlines-hidden -O3 -std=c++20 -DNDEBUG -fmodule-file=one=build/.gens/hello/macosx/
x86_64/release/rules/bmi/cache/modules/c83caa2b/one.pcm -fmodule-file=two=build/.gens/hello/macos
x/x86_64/release/rules/bmi/cache/modules/c83caa2b/two.pcm -o build/.objs/hello/macosx/x86_64/rele
ase/src/main.cpp.o src/main.cpp
checking for flags (-MMD -MF) ... ok
checking for clang++ ... /usr/local/Cellar/llvm/18.1.5/bin/clang++
checking for the linker (ld) ... clang++
checking for /usr/local/Cellar/llvm/18.1.5/bin/clang++ ... ok
checking for flags (-fPIC) ... ok
[ 87%]: linking.release hello
/usr/local/Cellar/llvm/18.1.5/bin/clang++ -o build/macosx/x86_64/release/hello build/.objs/hello/
macosx/x86_64/release/src/main.cpp.o build/.objs/hello/macosx/x86_64/release/src/one.cppm.o build
/.objs/hello/macosx/x86_64/release/src/two.cppm.o -m64 -isysroot /Applications/Xcode.app/Contents
/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.0.sdk -Wl,-x -Wl,-dead_strip
[100%]: build ok, spent 3.792s
ruki-2:test ruki$ vim ./src/two.cppm

ruki-2:test ruki$ cat ./src/two.cppm
export module two;
import one;
export void twofunc() { onefunc(); }

ruki-2:test ruki$ xmake
[  0%]: <hello> generating.module.deps src/two.cppm
[ 50%]: <hello> compiling.module.release two
[ 75%]: compiling.release src/main.cpp
[ 87%]: linking.release hello
[100%]: build ok, spent 0.86s
ruki-2:test ruki$ xmake clean --all
ruki-2:test ruki$ xmake
checking for platform ... macosx
checking for architecture ... x86_64
checking for Xcode directory ... /Applications/Xcode.app
checking for Codesign Identity of Xcode ... Apple Development: [email protected] (T3NA4MRVPU)
checking for SDK version of Xcode for macosx (x86_64) ... 14.0
checking for Minimal target version of Xcode for macosx (x86_64) ... 14.0
[  0%]: <hello> generating.module.deps src/main.cpp
[  0%]: <hello> generating.module.deps src/one.cppm
[  0%]: <hello> generating.module.deps src/two.cppm
[ 37%]: <hello> compiling.module.release one
[ 50%]: <hello> compiling.module.release two
[ 75%]: compiling.release src/main.cpp
[ 87%]: linking.release hello
[100%]: build ok, spent 2.228s
warning: std and std.compat modules not found ! disabling them for the build, maybe try to add --
sdk=<PATH/TO/LLVM>
warning: add -v for getting more warnings ..

[ilobilo]

I don't know why that is, I'm having this issue constantly, on almost every added import. And not on a single project, but on others as well. On at least 2 distros (Ubuntu and Fedora) and both clang 18 and 19

[ilobilo]

newly added import system.memory.virt; line here

modules and source files are compiled in different targets