63 lines
2.8 KiB
Plaintext
63 lines
2.8 KiB
Plaintext
|
# warn-on-use.m4 serial 10
|
||
|
dnl Copyright (C) 2010-2023 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.
|
||
|
|
||
|
# gl_WARN_ON_USE_PREPARE(INCLUDES, NAMES)
|
||
|
# ---------------------------------------
|
||
|
# If the module 'posixcheck' is in use:
|
||
|
#
|
||
|
# For each whitespace-separated element in the list of NAMES, define
|
||
|
# HAVE_RAW_DECL_name if the function has a declaration among INCLUDES
|
||
|
# even after being undefined as a macro.
|
||
|
#
|
||
|
# See warn-on-use.h for some hints on how to poison function names, as
|
||
|
# well as ideas on poisoning global variables and macros. NAMES may
|
||
|
# include global variables, but remember that only functions work with
|
||
|
# _GL_WARN_ON_USE. Typically, INCLUDES only needs to list a single
|
||
|
# header, but if the replacement header pulls in other headers because
|
||
|
# some systems declare functions in the wrong header, then INCLUDES
|
||
|
# should do likewise.
|
||
|
#
|
||
|
# It is generally safe to assume declarations for functions declared
|
||
|
# in the intersection of C89 and C11 (such as printf) without
|
||
|
# needing gl_WARN_ON_USE_PREPARE.
|
||
|
AC_DEFUN([gl_WARN_ON_USE_PREPARE],
|
||
|
[
|
||
|
m4_ifdef([gl_POSIXCHECK],
|
||
|
[m4_foreach_w([gl_decl], [$2],
|
||
|
[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
|
||
|
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],
|
||
|
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1],
|
||
|
[[#undef $gl_func
|
||
|
(void) $gl_func;]])],
|
||
|
[AS_VAR_SET([gl_Symbol], [yes])], [AS_VAR_SET([gl_Symbol], [no])])])
|
||
|
ac_compile="$ac_save_ac_compile"
|
||
|
AS_VAR_IF([gl_Symbol], [yes],
|
||
|
[AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1])
|
||
|
dnl Shortcut 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
|
||
|
])
|
||
|
])
|