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# error_h.m4 serial 3
dnl Copyright (C) 1996-2023 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.
dnl From Bruno Haible.
dnl Provide a working "error.h".
AC_DEFUN_ONCE([gl_ERROR_H],
[
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
gl_CHECK_NEXT_HEADERS([error.h])
if test $ac_cv_header_error_h = yes; then
HAVE_ERROR_H=1
else
HAVE_ERROR_H=0
fi
AC_SUBST([HAVE_ERROR_H])
REPLACE_ERROR=0
gl_CHECK_FUNCS_ANDROID([error], [[#include <error.h>]])
if test $ac_cv_func_error = yes; then
HAVE_ERROR=1
else
HAVE_ERROR=0
case "$gl_cv_onwards_func_error" in
future*) REPLACE_ERROR=1 ;;
esac
fi
dnl We don't use AC_FUNC_ERROR_AT_LINE any more, because it is no longer
dnl maintained in Autoconf and because it invokes AC_LIBOBJ.
dnl We need to notice a missing declaration, like gl_CHECK_FUNCS_ANDROID does.
AC_CHECK_DECL([error_at_line], , , [[#include <error.h>]])
if test $ac_cv_have_decl_error_at_line = yes; then
AC_CACHE_CHECK([for error_at_line], [ac_cv_lib_error_at_line],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <error.h>]],
[[error_at_line (0, 0, "", 0, "an error occurred");]])],
[ac_cv_lib_error_at_line=yes],
[ac_cv_lib_error_at_line=no])])
else
ac_cv_lib_error_at_line=no
fi
if test $ac_cv_lib_error_at_line = yes; then
HAVE_ERROR_AT_LINE=1
else
HAVE_ERROR_AT_LINE=0
fi
REPLACE_ERROR_AT_LINE=0
if test $ac_cv_func_error = yes && test $ac_cv_lib_error_at_line = yes; then
dnl On Android 11, when error_print_progname is set, the output of the
dnl error() function contains an extra space.
AC_CACHE_CHECK([for working error function],
[gl_cv_func_working_error],
[if test $cross_compiling != yes; then
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[
#include <error.h>
static void print_no_progname (void) {}
]], [[
error_print_progname = print_no_progname;
error (0, 0, "foo");
]])
],
[rm -f conftest.out
if test -s conftest$ac_exeext \
&& ./conftest$ac_exeext 2> conftest.out; then
if grep ' ' conftest.out >/dev/null; then
gl_cv_func_working_error=no
else
gl_cv_func_working_error=yes
fi
else
gl_cv_func_working_error=no
fi
rm -f conftest.out
],
[gl_cv_func_working_error=no])
else
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
#include <error.h>
]], [[
error (0, 0, "foo");
]])
],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_working_error="guessing yes" ;;
# Guess no on Android.
linux*-android*) gl_cv_func_working_error="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_working_error="$gl_cross_guess_normal" ;;
esac
],
[gl_cv_func_working_error=no])
fi
])
case "$gl_cv_func_working_error" in
*no)
REPLACE_ERROR=1
REPLACE_ERROR_AT_LINE=1
;;
esac
fi
if test $HAVE_ERROR = 0 || test $REPLACE_ERROR = 1 \
|| test $HAVE_ERROR_AT_LINE = 0 || test $REPLACE_ERROR_AT_LINE = 1; then
dnl Provide a substitute <error.h> file.
GL_GENERATE_ERROR_H=true
else
GL_GENERATE_ERROR_H=false
fi
AC_SUBST([HAVE_ERROR])
AC_SUBST([HAVE_ERROR_AT_LINE])
AC_SUBST([REPLACE_ERROR])
AC_SUBST([REPLACE_ERROR_AT_LINE])
])
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