| Issue |
125092
|
| Summary |
[libc][test] make DeathTestExecutors and FPExceptionHelpers hermetic
|
| Labels |
libc
|
| Assignees |
nickdesaulniers
|
| Reporter |
nickdesaulniers
|
Towards the goal of being able to cross compile full builds, I hit a snag yesterday when cross compiling some of the unit tests. With some other smaller fixes to our cmake, I can cross compile (and run in QEMU) _some_ unit tests, but quite a few still fail to build.
80cf21dad150a added a [TODO](https://github.com/llvm/llvm-project/blob/c39fba209ce655cf5997878b0bf794da269f008a/libc/test/UnitTest/CMakeLists.txt#L29-L30) that implies that the LibcDeathTestExecutors and LibcFPExceptionHelpers are indeed not yet hermetic. (It then unsets `LLVM_LIBC_FULL_BUILD` which changes the set compiler options from `_get_common_test_compile_options`).
Here's an example failure:
```
llvm-project/libc/test/UnitTest/LibcDeathTestExecutors.cpp:15:10: fatal error: 'assert.h' file not found
15 | #include <assert.h>
| ^~~~~~~~~~
```
I suspect we can start relying on hdr/ for these from the UnitTests.
So that needs to get fixed first, before we can cross compile the entire unit test suite.
cc @lntue
---
FWIW, my cmake invocation is:
```
$ cmake ../runtimes -GNinja -DLLVM_ENABLE_LLD=ON -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_RUNTIMES="libc" -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLLVM_LIBC_FULL_BUILD=ON -DLIBC_TARGET_TRIPLE=aarch64-linux-gnu -DCMAKE_CROSSCOMPILING_EMULATOR=qemu-aarch64 -DLIBC_KERNEL_HEADERS=/tmp/sysroot/include
```
and my kernel headers were built via:
```
$ make LLVM=1 ARCH=arm64 INSTALL_HDR_PATH=/tmp/sysroot headers_install
```
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