[libc] Fix fixed point detection and add compile option.

[lntue]

No description provided.

[llvmbot]

@llvm/pr-subscribers-libc

Author: None (lntue)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/81788.diff

2 Files Affected:

• (modified) libc/cmake/modules/LLVMLibCObjectRules.cmake (+4)
• (modified) libc/cmake/modules/compiler_features/check_fixed_point.cpp (+1-1)

diff --git a/libc/cmake/modules/LLVMLibCObjectRules.cmake b/libc/cmake/modules/LLVMLibCObjectRules.cmake
index ef1f24863f61ab..54c7e1eaed0bfd 100644
--- a/libc/cmake/modules/LLVMLibCObjectRules.cmake
+++ b/libc/cmake/modules/LLVMLibCObjectRules.cmake
@@ -49,6 +49,10 @@ function(_get_common_compile_options output_var flags)
       list(APPEND compile_options "-ffreestanding")
     endif()
 
+    if(LIBC_COMPILER_HAS_FIXED_POINT)
+      list(APPEND compile_options "-ffixed-point")
+    endif()
+
     list(APPEND compile_options "-fno-builtin")
     list(APPEND compile_options "-fno-exceptions")
     list(APPEND compile_options "-fno-lax-vector-conversions")
diff --git a/libc/cmake/modules/compiler_features/check_fixed_point.cpp b/libc/cmake/modules/compiler_features/check_fixed_point.cpp
index 02932dbf4d722d..a5192697d43f77 100644
--- a/libc/cmake/modules/compiler_features/check_fixed_point.cpp
+++ b/libc/cmake/modules/compiler_features/check_fixed_point.cpp
@@ -1,4 +1,4 @@
-#include "include/llvm-libc-macross/stdfix_macros.h"
+#include "include/llvm-libc-macros/stdfix-macros.h"
 
 #ifndef LIBC_COMPILER_HAS_FIXED_POINT
 #error unsupported

[nickdesaulniers]

https://en.wikipedia.org/wiki/Macross :gundam:

[michaelrj-google]

Tests pass with this patch.