[libc] remove MPFR and related tests in full build

Author: SchrodingerZhu

libc/cmake/modules/LLVMLibCCheckMPFR.cmake

@@ -2,7 +2,7 @@ set(LLVM_LIBC_MPFR_INSTALL_PATH "" CACHE PATH "Path to where MPFR is installed (
 
 if(LLVM_LIBC_MPFR_INSTALL_PATH)
   set(LIBC_TESTS_CAN_USE_MPFR TRUE)
-elseif(LIBC_TARGET_OS_IS_GPU)
+elseif(LIBC_TARGET_OS_IS_GPU OR LLVM_LIBC_FULL_BUILD)
   set(LIBC_TESTS_CAN_USE_MPFR FALSE)
 else()
   try_compile(

libc/utils/MPFRWrapper/CMakeLists.txt

@@ -5,12 +5,6 @@ if(LIBC_TESTS_CAN_USE_MPFR)
     mpfr_inc.h
   )
   target_compile_options(libcMPFRWrapper PRIVATE -O3)
-  if (LLVM_LIBC_FULL_BUILD)
-    # It is not easy to make libcMPFRWrapper a standalone library because gmp.h may unconditionally
-    # pull in some STL headers. As a result, targets using this library will need to link against
-    # C++ and unwind libraries. Since we are using MPFR anyway, we directly specifies the GNU toolchain.
-    target_link_libraries(libcMPFRWrapper PUBLIC -lstdc++ -lgcc_s)
-  endif()
   add_dependencies(
     libcMPFRWrapper
     libc.src.__support.CPP.string_view
@@ -24,6 +18,6 @@ if(LIBC_TESTS_CAN_USE_MPFR)
     target_link_directories(libcMPFRWrapper PUBLIC ${LLVM_LIBC_MPFR_INSTALL_PATH}/lib)
   endif()
   target_link_libraries(libcMPFRWrapper PUBLIC LibcFPTestHelpers.unit LibcTest.unit mpfr gmp)
-elseif(NOT LIBC_TARGET_OS_IS_GPU)
+elseif(NOT LIBC_TARGET_OS_IS_GPU AND NOT LLVM_LIBC_FULL_BUILD)
   message(WARNING "Math tests using MPFR will be skipped.")
 endif()

libc/utils/MPFRWrapper/mpfr_inc.h

@@ -17,21 +17,7 @@
 // MPFR header can be included in manner allowed in that repo.
 #include "CustomMPFRIncluder.h"
 #else
-
-extern "C" {
-#pragma push_macro("__cplusplus")
-#if defined(__clang__)
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wbuiltin-macro-redefined"
-#endif
-#undef __cplusplus
 #include <mpfr.h>
-#if defined(__clang__)
-#pragma clang diagnostic pop
-#endif
-#pragma pop_macro("__cplusplus")
-}
-
 #endif
 
 #endif // LLVM_LIBC_UTILS_MPFRWRAPPER_MPFR_INC_H