aaronpuchert wrote:
That configuration output is from `compiler-rt`, but we need it in `llvm`. In
`llvm/lib/ExecutionEngine/Orc/CMakeLists.txt`:
```cmake
if( CMAKE_HOST_UNIX AND HAVE_LIBRT )
set(rt_lib rt)
endif()
```
We have `CMAKE_HOST_UNIX` = 1, but `HAVE_LIBRT` is empty. It comes from
`check_library_exists(rt clock_gettime "" HAVE_LIBRT)` in
`llvm/cmake/config-ix.cmake`. The corresponding output:
```
-- Looking for clock_gettime in rt
-- Looking for clock_gettime in rt - not found
```
This looks correct to me:
```
> readelf --dyn-syms --wide
> /home/aaron/chrome-sysroot/usr/lib/x86_64-linux-gnu/librt.so | grep
> clock_gettime
38: 0000000000000000 0 FUNC GLOBAL DEFAULT UND
__clock_gettime@GLIBC_PRIVATE (7)
```
Instead it's in `libc.so.6`:
```
> readelf --dyn-syms --wide
> /home/aaron/chrome-sysroot/lib/x86_64-linux-gnu/libc.so.6 | grep clock_gettime
840: 00000000000c3420 111 FUNC GLOBAL DEFAULT 13
__clock_gettime@@GLIBC_PRIVATE
1748: 00000000000c3420 111 FUNC GLOBAL DEFAULT 13
clock_gettime@GLIBC_2.2.5
1751: 00000000000c3420 111 FUNC GLOBAL DEFAULT 13
clock_gettime@@GLIBC_2.17
```
On my system that's not an issue because `libc.so` has both `clock_gettime` and
`shm_open`, so `librt.so` is never needed. Do you have any additional patches
or why does this work for you?
https://github.com/llvm/llvm-project/pull/119071
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