dnl 'extern inline' a la ISO C99. dnl Copyright 2012-2013 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_EXTERN_INLINE], [ AH_VERBATIM([extern_inline], [/* _GL_INLINE is a portable alternative to ISO C99 plain 'inline'. _GL_EXTERN_INLINE is a portable alternative to 'extern inline'. _GL_INLINE_HEADER_BEGIN contains useful stuff to put in an include file, before uses of _GL_INLINE. It suppresses GCC's bogus "no previous prototype for 'FOO'" diagnostic, when FOO is an inline function in the header; see <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>. _GL_INLINE_HEADER_END contains useful stuff to put in the same include file, after uses of _GL_INLINE. Suppress extern inline with HP-UX cc, as it appears to be broken; see <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>. Suppress the use of extern inline on Apple's platforms, as Libc-825.25 (2012-09-19) is incompatible with it; see <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>. Perhaps Apple will fix this some day. */ #if ((__GNUC__ \ ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \ : 199901L <= __STDC_VERSION__ && !defined __HP_cc) \ && !defined __APPLE__) # define _GL_INLINE inline # define _GL_EXTERN_INLINE extern inline #elif 2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __APPLE__ # if __GNUC_GNU_INLINE__ /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */ # define _GL_INLINE extern inline __attribute__ ((__gnu_inline__)) # else # define _GL_INLINE extern inline # endif # define _GL_EXTERN_INLINE extern #else # define _GL_INLINE static _GL_UNUSED # define _GL_EXTERN_INLINE static _GL_UNUSED #endif #if 4 < __GNUC__ + (6 <= __GNUC_MINOR__) # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ # define _GL_INLINE_HEADER_CONST_PRAGMA # else # define _GL_INLINE_HEADER_CONST_PRAGMA \ _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"") # endif # define _GL_INLINE_HEADER_BEGIN \ _Pragma ("GCC diagnostic push") \ _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \ _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \ _GL_INLINE_HEADER_CONST_PRAGMA # define _GL_INLINE_HEADER_END \ _Pragma ("GCC diagnostic pop") #else # define _GL_INLINE_HEADER_BEGIN # define _GL_INLINE_HEADER_END #endif]) ])