[libc][NFC] Do not add libc test framework and -fno-rtti to C tests. (#84837)

Author: lntue

libc/cmake/modules/LLVMLibCCompileOptionRules.cmake

@@ -108,7 +108,7 @@ function(_get_common_compile_options output_var flags)
   set(${output_var} ${compile_options} PARENT_SCOPE)
 endfunction()
 
-function(_get_common_test_compile_options output_var flags)
+function(_get_common_test_compile_options output_var c_test flags)
   _get_compile_options_from_flags(compile_flags ${flags})
 
   set(compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT} ${compile_flags})
@@ -122,7 +122,9 @@ function(_get_common_test_compile_options output_var flags)
       list(APPEND compile_options "-fno-exceptions")
       list(APPEND compile_options "-fno-unwind-tables")
       list(APPEND compile_options "-fno-asynchronous-unwind-tables")
-      list(APPEND compile_options "-fno-rtti")
+      if(NOT ${c_test})
+        list(APPEND compile_options "-fno-rtti")
+      endif()
     endif()
 
     if(LIBC_COMPILER_HAS_FIXED_POINT)

libc/cmake/modules/LLVMLibCTestRules.cmake

@@ -111,7 +111,7 @@ function(create_libc_unittest fq_target_name)
 
   cmake_parse_arguments(
     "LIBC_UNITTEST"
-    "NO_RUN_POSTBUILD" # Optional arguments
+    "NO_RUN_POSTBUILD;C_TEST" # Optional arguments
     "SUITE;CXX_STANDARD" # Single value arguments
     "SRCS;HDRS;DEPENDS;COMPILE_OPTIONS;LINK_LIBRARIES;FLAGS" # Multi-value arguments
     ${ARGN}
@@ -126,11 +126,14 @@ function(create_libc_unittest fq_target_name)
   endif()
 
   get_fq_deps_list(fq_deps_list ${LIBC_UNITTEST_DEPENDS})
-  list(APPEND fq_deps_list libc.src.__support.StringUtil.error_to_string
-                           libc.test.UnitTest.ErrnoSetterMatcher)
+  if(NOT LIBC_UNITTEST_C_TEST)
+    list(APPEND fq_deps_list libc.src.__support.StringUtil.error_to_string
+                             libc.test.UnitTest.ErrnoSetterMatcher)
+  endif()
   list(REMOVE_DUPLICATES fq_deps_list)
 
-  _get_common_test_compile_options(compile_options "${LIBC_UNITTEST_FLAGS}")
+  _get_common_test_compile_options(compile_options "${LIBC_UNITTEST_C_TEST}"
+                                   "${LIBC_UNITTEST_FLAGS}")
   list(APPEND compile_options ${LIBC_UNITTEST_COMPILE_OPTIONS})
 
   if(SHOW_INTERMEDIATE_OBJECTS)
@@ -214,7 +217,9 @@ function(create_libc_unittest fq_target_name)
   )
 
   # LibcUnitTest should not depend on anything in LINK_LIBRARIES.
-  list(APPEND link_libraries LibcDeathTestExecutors.unit LibcTest.unit)
+  if(NOT LIBC_UNITTEST_C_TEST)
+    list(APPEND link_libraries LibcDeathTestExecutors.unit LibcTest.unit)
+  endif()
 
   target_link_libraries(${fq_build_target_name} PRIVATE ${link_libraries})
 

libc/test/include/CMakeLists.txt

@@ -37,6 +37,7 @@ if(LLVM_LIBC_FULL_BUILD AND libc.include.stdbit IN_LIST TARGET_PUBLIC_HEADERS)
   )
   add_libc_test(
     stdbit_c_test
+    C_TEST
     UNIT_TEST_ONLY
     SUITE
       libc_include_tests