-# warn-on-use.m4 serial 6
-dnl Copyright (C) 2010-2020 Free Software Foundation, Inc.
+# warn-on-use.m4 serial 10
+dnl Copyright (C) 2010-2022 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.
[AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])),
[Define to 1 if ]m4_defn([gl_decl])[ is declared even after
undefining macros.])])dnl
-dnl FIXME: gl_Symbol must be used unquoted until we can assume
-dnl autoconf 2.64 or newer.
for gl_func in m4_flatten([$2]); do
AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl
+ dnl As a workaround to implicit built-in function declarations in
+ dnl clang (e.g. strndup), reference ac_compile_for_check_decl instead
+ dnl of ac_compile. If, for whatever reason, the override of AC_PROG_CC
+ dnl in zzgnulib.m4 is inactive, use the original ac_compile.
+ ac_save_ac_compile="$ac_compile"
+ if test -n "$ac_compile_for_check_decl"; then
+ ac_compile="$ac_compile_for_check_decl"
+ fi
AC_CACHE_CHECK([whether $gl_func is declared without a macro],
- gl_Symbol,
+ [gl_Symbol],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1],
-[@%:@undef $gl_func
- (void) $gl_func;])],
- [AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])])
- AS_VAR_IF(gl_Symbol, [yes],
+[[#undef $gl_func
+ (void) $gl_func;]])],
+ [AS_VAR_SET([gl_Symbol], [yes])], [AS_VAR_SET([gl_Symbol], [no])])])
+ ac_compile="$ac_save_ac_compile"
+ AS_VAR_IF([gl_Symbol], [yes],
[AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1])
- dnl shortcut - if the raw declaration exists, then set a cache
- dnl variable to allow skipping any later AC_CHECK_DECL efforts
- eval ac_cv_have_decl_$gl_func=yes])
+ dnl Shortcut for an AC_CHECK_DECL invocation that may come later:
+ dnl If the raw declaration exists with the given includes, then
+ dnl AC_CHECK_DECL with its many includes would see it as well.
+ dnl So, set a cache variable to allow skipping any later
+ dnl AC_CHECK_DECL invocation for $gl_func.
+ eval "ac_cv_have_decl_$gl_func=yes"
+ ])
AS_VAR_POPDEF([gl_Symbol])dnl
done
])