[compiler-rt] [compiler-rt][cmake] Add option to control shared library builds (PR #139042)

[Sam Clegg via llvm-commits]

================
@@ -91,6 +91,13 @@ mark_as_advanced(COMPILER_RT_SCUDO_STANDALONE_BUILD_SHARED)
 option(COMPILER_RT_BUILD_SCUDO_STANDALONE_WITH_LLVM_LIBC "Build SCUDO standalone with LLVM's libc headers" OFF)
 mark_as_advanced(COMPILER_RT_BUILD_SCUDO_STANDALONE_WITH_LLVM_LIBC)
 
+set(COMPILER_RT_BUILD_SHARED_LIBS_DEFAULT ON)
+if(CMAKE_SYSTEM_NAME STREQUAL "WASI")
+  set(COMPILER_RT_BUILD_SHARED_LIBS_DEFAULT OFF)
+endif()
----------------
sbc100 wrote:

Also, I think my other point that default to not building shared libraries under WASI is maybe not the best approach for now since we are close the enabling them in wasi-sdk (i.e. we might soon revert the default).

https://github.com/llvm/llvm-project/pull/139042