Use the __inline__ keyword instead of __inline to avoid breakage

Newer compilers default to GNU11, a C11 dialect. Some software however
is unprepared for this or has wrong compatibility checks. What happens
is that some software will for compatibility with C89

  #define inline

before inclusion of a standard header, which is undefined behaviour in
C99 and above (C99/C11 7.1.2/4), as inline is a keyword.

If any libc headers that are then included via #include_next provide an
__inline macro definition (current musl does this if C++ or C99 and
above is detected) like the following

  #define __inline inline

this results in any __inline token to be preprocessed away.

This breaks use of __builtin_va_arg_pack() in our stdio.h at
compile-time as it can only be used in always inlined functions. The
function attributes __always_inline__ and __gnu_inline__ themselves
require an inline specifier on the function to be applied.

2 files changed, 3 insertions, 3 deletions

diff --git a/include/fortify-headers.h b/include/fortify-headers.h
index 288a973..c4e6495 100644
--- a/include/fortify-headers.h
+++ b/include/fortify-headers.h
@@ -19,6 +19,6 @@
 #define _FORTIFY_STR(s) #s
 #define _FORTIFY_ORIG(p,fn) __typeof__(fn) __orig_##fn __asm__(_FORTIFY_STR(p) #fn)
 #define _FORTIFY_FN(fn) _FORTIFY_ORIG(__USER_LABEL_PREFIX__,fn); \
-        extern __inline __attribute__((__always_inline__,__gnu_inline__,__artificial__))
+        extern __inline__ __attribute__((__always_inline__,__gnu_inline__,__artificial__))
 
 #endif
diff --git a/include/sys/select.h b/include/sys/select.h
index 4623071..db6135d 100644
--- a/include/sys/select.h
+++ b/include/sys/select.h
@@ -24,7 +24,7 @@
 extern "C" {
 #endif
 
-static __inline __attribute__((__always_inline__,__gnu_inline__,__artificial__))
+static __inline__ __attribute__((__always_inline__,__gnu_inline__,__artificial__))
 void __fortify_FD_CLR(int __f, fd_set *__s)
 {
         size_t __b = __builtin_object_size(__s, 0);
@@ -34,7 +34,7 @@ void __fortify_FD_CLR(int __f, fd_set *__s)
         FD_CLR(__f, __s);
 }
 
-static __inline __attribute__((__always_inline__,__gnu_inline__,__artificial__))
+static __inline__ __attribute__((__always_inline__,__gnu_inline__,__artificial__))
 void __fortify_FD_SET(int __f, fd_set *__s)
 {
         size_t __b = __builtin_object_size(__s, 0);