[libcxx][libcxxabi] CMAKE_REQUIRED_FLAGS is a string, not a list
When `libcxx` or `libcxxabi` is built with `-DLLVM_USE_SANITIZER=MemoryWithOrigins`
**and** `-DLIBCXX[ABI]_USE_COMPILER_RT=ON`, all of the `LIBCXX[ABI]_SUPPORTS_*_FLAG`
checks fail, since the value of `CMAKE_REQUIRED_FLAGS` is not set correctly.
Bugzilla: https://bugs.llvm.org/show_bug.cgi?id=51774
Reviewed By: #libc, #libc_abi, compnerd, ldionne
Differential Revision: https://reviews.llvm.org/D109342
GitOrigin-RevId: 1613ab8a4a3e6f8ab74fadd7e9a2dfe2219e3b43
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index 7f1cecb..998e254 100644
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -38,7 +38,7 @@
list(APPEND CMAKE_REQUIRED_LIBRARIES c)
endif ()
if (LIBCXXABI_USE_COMPILER_RT)
- list(APPEND CMAKE_REQUIRED_FLAGS -rtlib=compiler-rt)
+ set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -rtlib=compiler-rt")
find_compiler_rt_library(builtins LIBCXXABI_BUILTINS_LIBRARY)
list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBCXXABI_BUILTINS_LIBRARY}")
else ()
