Louis Dionne a4336f2ec1 [runtimes] Don't link against compiler-rt explicitly when we use -nostdlib++ (#75089) ... When we use the -nostdlib++ flag, we don't need to explicitly link against compiler-rt, since the compiler already links against it by default. This simplifies the flags that we need to use when building with Clang and GCC, and opens the door to further simplifications since most platforms won't need to detect whether libgcc and libgcc_s are supported anymore. Furthermore, on platforms where -nostdlib++ is used, this patch prevents manually linking compiler-rt *before* other system libraries. For example, Apple platforms have several compiler-rt symbols defined in libSystem.dylib. If we manually link against compiler-rt, we end up overriding the default link order preferred by the compiler and potentially using the symbols from the clang-provided libclang_rt.a library instead of the system provided one. Note that we don't touch how libunwind links against compiler-rt when it builds the .so/.a because libunwind currently doesn't use -nodefaultlibs and we want to avoid rocking the boat too much. rdar://119506163		2023-12-13 13:57:48 -05:00
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config-ix.cmake	[runtimes] Don't link against compiler-rt explicitly when we use -nostdlib++ (#75089)	2023-12-13 13:57:48 -05:00