- AC_REPLACE_FUNCS([dirfd])
- AC_CHECK_DECLS([dirfd])
- if test $ac_cv_func_dirfd = no; then
+ AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
+ gl_REPLACE_DIRENT_H
+
+ dnl Persuade glibc <dirent.h> to declare dirfd().
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+ AC_CHECK_FUNCS([dirfd])
+ AC_CHECK_DECLS([dirfd], , ,
+ [#include <sys/types.h>
+ #include <dirent.h>])
+ if test $ac_cv_have_decl_dirfd = no; then
+ HAVE_DECL_DIRFD=0
+ fi
+
+ AC_CACHE_CHECK([whether dirfd is a macro],
+ gl_cv_func_dirfd_macro,
+ [AC_EGREP_CPP([dirent_header_defines_dirfd], [
+#include <sys/types.h>
+#include <dirent.h>
+#ifdef dirfd
+ dirent_header_defines_dirfd
+#endif],
+ gl_cv_func_dirfd_macro=yes,
+ gl_cv_func_dirfd_macro=no)])
+
+ # Use the replacement only if we have no function or macro with that name.
+ if test $ac_cv_func_dirfd,$gl_cv_func_dirfd_macro = no,no; then
+ if test $ac_cv_have_decl_dirfd = yes; then
+ # If the system declares dirfd already, let's declare rpl_dirfd instead.
+ REPLACE_DIRFD=1
+ fi
+ AC_LIBOBJ([dirfd])