kbuild: Use -fmin-function-alignment when available

[linux-2.6-microblaze.git] / arch / Kconfig

diff --git a/arch/Kconfig b/arch/Kconfig
index a5af0ed..bd6c633 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1507,4 +1507,16 @@ config FUNCTION_ALIGNMENT
        default 4 if FUNCTION_ALIGNMENT_4B
        default 0
 
+config CC_HAS_MIN_FUNCTION_ALIGNMENT
+       # Detect availability of the GCC option -fmin-function-alignment which
+       # guarantees minimal alignment for all functions, unlike
+       # -falign-functions which the compiler ignores for cold functions.
+       def_bool $(cc-option, -fmin-function-alignment=8)
+
+config CC_HAS_SANE_FUNCTION_ALIGNMENT
+       # Set if the guaranteed alignment with -fmin-function-alignment is
+       # available or extra care is required in the kernel. Clang provides
+       # strict alignment always, even with -falign-functions.
+       def_bool CC_HAS_MIN_FUNCTION_ALIGNMENT || CC_IS_CLANG
+
 endmenu