| Issue |
117438
|
| Summary |
[clang] clang -M should print expanded paths
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
xtexChooser
|
When using `clang -M`, some c++ standard library headers' paths are not real paths.
For example, on AOSC OS (a usr-merged Linux distribution), `/bin/../lib64/gcc/` ... are emitted. These paths are valid for IO operations (`/bin` is linked to `/usr/bin` on usr-merged distributions, thus `/bin/../lib64` is equivalent to `/usr/lib64`), but not for Make and Ninja. Both make and ninja canonicalize them to `/lib64`, which does not exist, and they always regards these targets as dirty and rebuilds them everytime.
```
xtex@xtex1 ~ (main)> cat test.cpp
#include <cstdio>
int main() { return 0; }
xtex@xtex1 ~ (main)> clang -M test.cpp
test.o: test.cpp \
/bin/../lib64/gcc/x86_64-aosc-linux-gnu/13.2.0/../../../../include/c++/13.2.0/cstdio \
/bin/../lib64/gcc/x86_64-aosc-linux-gnu/13.2.0/../../../../include/c++/13.2.0/x86_64-aosc-linux-gnu/bits/c++config.h \
/bin/../lib64/gcc/x86_64-aosc-linux-gnu/13.2.0/../../../../include/c++/13.2.0/pstl/pstl_config.h \
/usr/include/tbb/tbb.h /usr/include/stdio.h \
/usr/include/bits/libc-header-start.h \
/usr/lib/clang/18/include/stdarg.h \
(some paths are emitted)
```
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