extern inline problem with argp when building tar 1.19 with GCC 4.2.1

[Paul Eggert]

This was Solaris 8 (sparc), though I doubt that matters.  Here's the
behavior I observed:

        depbase=`echo argp-fmtstream.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
                gcc -m64 -std=gnu99 -DHAVE_CONFIG_H -I. -I..     -g -O2 -MT 
argp-fmtstream.o -MD -MP -MF $depbase.Tpo -c -o argp-fmtstream.o 
argp-fmtstream.c &&\
                mv -f $depbase.Tpo $depbase.Po
        In file included from argp-fmtstream.c:32:
        argp-fmtstream.h:206: warning: C99 inline functions are not supported; 
using GNU89
        argp-fmtstream.h:206: warning: to disable this warning use 
-fgnu89-inline or the gnu_inline function attribute
        argp-fmtstream.h:219: warning: C99 inline functions are not supported; 
using GNU89

... and lots more warnings like that.

I installed the following workaround into gnulib for now.  I suspect
we might need a better solution in the long run, but this solves the
immediate problem.

2007-10-12  Paul Eggert  <address@hidden>

        * lib/argp-fmtstream.h (ARGP_FS_EI): Work around GCC 4.2.1 diagnostic
        "warning: C99 inline functions are not supported; using GNU89".

--- a/lib/argp-fmtstream.h
+++ b/lib/argp-fmtstream.h
@@ -197,7 +197,13 @@ extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, 
size_t __amount);
 #endif

 #ifndef ARGP_FS_EI
-#define ARGP_FS_EI extern inline
+# if __GNUC_GNU_INLINE__
+#  define ARGP_FS_EI extern inline __attribute__ ((__gnu_inline__))
+# elif __GNUC__
+#  define ARGP_FS_EI extern inline
+# else
+#  define ARGP_FS_EI inline
+# endif
 #endif

 ARGP_FS_EI size_t