GNULIB is adding -Wmissing-prototypes in config.h

[Jeffrey Johnson]

This is a minor (but annoying warning spewage) gnulib addition to config.h when compiling with G++

In file included from <command-line>:0:0:

./../../config.h:10238:5: warning: option ‘-Wmissing-prototypes’ is valid for C/ObjC but not for C++ [-Wpragmas]

     _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \

     ^

The code around line 10238 in config.h looks like this:

#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

  /* Suppress GCC's bogus "no previous prototype for 'FOO'"

     and "no previous declaration for 'FOO'"  diagnostics,

     when FOO is an inline function in the header; see

     <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>.  */

# 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

Conditioning the define with “#ifndef __cplusplus” makes the warning go away:

    _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \

$ g++ --version

g++ (GCC) 6.3.1 20161221 (Red Hat 6.3.1-1)

hth

73 de Jeff