| Issue |
139771
|
| Summary |
[Runtimes] -nostdlib++ and -nostdinc++ in CMAKE_REQUIRED_FLAGS breaks systems introspection
|
| Labels |
new issue
|
| Assignees |
rnk,
mstorsjo,
petrhosek,
MaskRay,
ldionne,
vitalybuka
|
| Reporter |
Meinersbur
|
The flags `-nostdlib++` and `-nostdinc++` are added to CMAKE_REQUIRED_FLAGS whenever supported by the compiler:
https://github.com/llvm/llvm-project/blob/dcd5e476d91da267f49b837c07a84df43b1800cd/runtimes/CMakeLists.txt#L161
https://github.com/llvm/llvm-project/blob/dcd5e476d91da267f49b837c07a84df43b1800cd/runtimes/CMakeLists.txt#L157
For a normal bootstrapping build the compiler is Clang, so it will always be added. It inherits to all runtimes libraries.
While it may make sense for libc++ to not depend on itself or another C++ standard library, the assumption breaks for any other LLVM runtime library that use C++, which included any GTest-based unittests. Tracking its history, it seems to have first been added in d3ebe7126bbff92bb6d9d2c6ed563316e5816f0b, but just temporarily. The temporary part was dropped at some point. The flags should only be added in those libraries that need it.
Adding those flags globally for all runtimes causes problems in system introspection. e.g.:
* OpenMP: #90332
* Flang-RT: #139712
* Flang-RT: #131010
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