Commit 3bee7f6209c63c7ce89d4e43971dcf8ead69e7a8
2011-01-18T22:38:10
include_next: do not check for standard headers like stddef.h I found this problem when modifying Emacs to use gnulib. I noticed that it added HAVE_STDDEF_H to config.h, even though gnulib always assumes <stddef.h> exists as per README and this symbol is unnecessary. * m4/include_next.m4 (gl_NEXT_HEADERS): New macro, which does not use AC_CHECK_HEADERS_ONCE, but which otherwise contains what gl_CHECK_NEXT_HEADERS used to contain. This makes 'configure' run faster for headers like stddef.h that are known to exist. (gl_CHECK_NEXT_HEADERS): Use it. * m4/float_h.m4 (gl_FLOAT_H): For float.h, use gl_NEXT_HEADERS rather than gl_CHECK_NEXT_HEADERS. * m4/stdarg.m4 (gl_STDARG_H): Likewise, for stdarg.h. * m4/stddef_h.m4 (gl_STDDEF_H): Likewise, for stddef.h.