[libc][stdfix] Use __FRACT_FBIT__ for fixed point support detection instead of compiler version.

[lntue]

Now that __FRACT_FBIT__ and related macros are added in #81207, it is safer to use them for fixed point support detection, so that codes that do not use fixed point types will not fail to build when -ffixed-point is missing.

[llvmbot]

@llvm/pr-subscribers-backend-amdgpu

@llvm/pr-subscribers-libc

Author: None (lntue)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/81820.diff

1 Files Affected:

• (modified) libc/utils/gpu/loader/nvptx/CMakeLists.txt (+3)

diff --git a/libc/utils/gpu/loader/nvptx/CMakeLists.txt b/libc/utils/gpu/loader/nvptx/CMakeLists.txt
index 0c76c49fa30985..991ca4749ad39c 100644
--- a/libc/utils/gpu/loader/nvptx/CMakeLists.txt
+++ b/libc/utils/gpu/loader/nvptx/CMakeLists.txt
@@ -4,6 +4,9 @@ add_dependencies(nvptx_loader libc.src.__support.RPC.rpc)
 if(NOT LLVM_ENABLE_RTTI)
   target_compile_options(nvptx_loader PRIVATE -fno-rtti)
 endif()
+if(LIBC_COMPILER_HAS_FIXED_POINT)
+  target_compile_options(amdhsa_loader PRIVATE "-ffixed-point")
+endif()
 target_include_directories(nvptx_loader PRIVATE ${LLVM_INCLUDE_DIRS})
 target_link_libraries(nvptx_loader
   PRIVATE