[PATCH v2 01/15] cdefs: Add mechanism to add attributes to __always_inline functions

[Christoph Müllner]

Contrary to LLVM, GCC does not propagate function attributes accross
inlined functions ("target specific option mismatch").  To overcome this
limiation, this patch introduces a __CODEGEN_ATTRIBUTE macro, which can
be used to add function attributes to __always_inline functions.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
---
 misc/sys/cdefs.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index ab9620bd0d..91dceab1f2 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -587,15 +587,19 @@
 #endif
 
 /* Forces a function to be always inlined.  */
+# ifndef __CODEGEN_ATTRIBUTES
+#  define __CODEGEN_ATTRIBUTES
+# endif
 #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__always_inline__)
 /* The Linux kernel defines __always_inline in stddef.h (283d7573), and
    it conflicts with this definition.  Therefore undefine it first to
    allow either header to be included first.  */
 # undef __always_inline
-# define __always_inline __inline __attribute__ ((__always_inline__))
+# define __always_inline __inline __attribute__ ((__always_inline__)) \
+   __CODEGEN_ATTRIBUTES
 #else
 # undef __always_inline
-# define __always_inline __inline
+# define __always_inline __inline __CODEGEN_ATTRIBUTES
 #endif
 
 /* Associate error messages with the source location of the call site rather
-- 
2.45.1