[libc] Disable LlvmLibcTimespecGet.Monotonic for baremetal targets (#152290)

This test was caught by our hermetic testing downstream. The baremetal
implementation does not support monotonic, so we disable it.

Author: saturn691

libc/cmake/modules/LLVMLibCCompileOptionRules.cmake

@@ -115,11 +115,31 @@ function(_get_compile_options_from_config output_var)
   set(${output_var} ${config_options} PARENT_SCOPE)
 endfunction(_get_compile_options_from_config)
 
+function(_get_compile_options_from_arch output_var)
+  # Set options that are not found in src/__support/macros/properties/architectures.h
+  # and src/__support/macros/properties/os.h
+  # TODO: we probably want to unify these at some point for consistency
+  set(config_options "")
+
+  if (LIBC_TARGET_OS_IS_BAREMETAL)
+    list(APPEND config_options "-DLIBC_TARGET_OS_IS_BAREMETAL")  
+  endif()
+  if (LIBC_TARGET_OS_IS_GPU)
+    list(APPEND config_options "-DLIBC_TARGET_OS_IS_GPU")  
+  endif()
+  if (LIBC_TARGET_OS_IS_UEFI)
+    list(APPEND config_options "-DLIBC_TARGET_OS_IS_UEFI")  
+  endif()
+
+  set(${output_var} ${config_options} PARENT_SCOPE)
+endfunction(_get_compile_options_from_arch)
+
 function(_get_common_compile_options output_var flags)
   _get_compile_options_from_flags(compile_flags ${flags})
   _get_compile_options_from_config(config_flags)
+  _get_compile_options_from_arch(arch_flags)
 
-  set(compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT} ${compile_flags} ${config_flags})
+  set(compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT} ${compile_flags} ${config_flags} ${arch_flags})
 
   if(LLVM_LIBC_COMPILER_IS_GCC_COMPATIBLE)
     list(APPEND compile_options "-fpie")

libc/cmake/modules/LLVMLibCTestRules.cmake

@@ -1,6 +1,7 @@
 function(_get_common_test_compile_options output_var c_test flags)
   _get_compile_options_from_flags(compile_flags ${flags})
   _get_compile_options_from_config(config_flags)
+  _get_compile_options_from_arch(arch_flags)
 
   # Remove -fno-math-errno if it was added.
   if(LIBC_ADD_FNO_MATH_ERRNO)
@@ -16,7 +17,8 @@ function(_get_common_test_compile_options output_var c_test flags)
       ${LIBC_COMPILE_OPTIONS_DEFAULT}
       ${LIBC_TEST_COMPILE_OPTIONS_DEFAULT}
       ${compile_flags}
-      ${config_flags})
+      ${config_flags}
+      ${arch_flags})
 
   if(LLVM_LIBC_COMPILER_IS_GCC_COMPATIBLE)
     list(APPEND compile_options "-fpie")

libc/test/src/time/timespec_get_test.cpp

@@ -24,6 +24,8 @@ TEST(LlvmLibcTimespecGet, Utc) {
 #endif
 }
 
+// Baremetal implementation currently only supports TIME_UTC
+#ifndef LIBC_TARGET_OS_IS_BAREMETAL
 TEST(LlvmLibcTimespecGet, Monotonic) {
   timespec ts1, ts2;
   int result;
@@ -37,6 +39,7 @@ TEST(LlvmLibcTimespecGet, Monotonic) {
     ASSERT_GE(ts2.tv_nsec, ts1.tv_nsec);
   }
 }
+#endif
 
 TEST(LlvmLibcTimespecGet, Unknown) {
   timespec ts;