mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2025-01-07 13:30:24 +00:00
62 lines
1.9 KiB
Plaintext
62 lines
1.9 KiB
Plaintext
# serial 9
|
|
# See if we need to provide faccessat replacement.
|
|
|
|
dnl Copyright (C) 2009-2020 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.
|
|
|
|
# Written by Eric Blake.
|
|
|
|
AC_DEFUN([gl_FUNC_FACCESSAT_EOVERFLOW],
|
|
[
|
|
AC_CHECK_FUNCS_ONCE([faccessat])
|
|
if test "$ac_cv_func_faccessat" = yes; then
|
|
AC_CACHE_CHECK([whether faccessat works when stat would EOVERFLOW],
|
|
[gl_cv_func_faccessat_never_eoverflows],
|
|
[AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM([],
|
|
[[#ifdef __linux__
|
|
#include <linux/version.h>
|
|
#if (! (KERNEL_VERSION (5, 8, 0) <= LINUX_VERSION_CODE \
|
|
&& 2 < (__GLIBC__ + (33 <= __GLIBC_MINOR__))))
|
|
#error "faccessat might fail with EOVERFLOW"
|
|
#endif
|
|
#endif
|
|
]])],
|
|
[gl_cv_func_faccessat_never_eoverflows=yes],
|
|
[gl_cv_func_faccessat_never_eoverflows=no])])
|
|
if test "$gl_cv_func_faccessat_never_eoverflows" = yes; then
|
|
AC_DEFINE([FACCESSAT_NEVER_EOVERFLOWS], 1,
|
|
[Define to 1 if faccessat is EOVERFLOW-free.])
|
|
fi
|
|
fi
|
|
])
|
|
|
|
AC_DEFUN([gl_FUNC_FACCESSAT],
|
|
[
|
|
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
|
|
AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
|
|
|
|
dnl Persuade glibc <unistd.h> to declare faccessat().
|
|
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
|
|
|
|
AC_REQUIRE([gl_FUNC_FACCESSAT_EOVERFLOW])
|
|
|
|
AC_CHECK_FUNCS_ONCE([faccessat])
|
|
if test $ac_cv_func_faccessat = no; then
|
|
HAVE_FACCESSAT=0
|
|
else
|
|
case $gl_cv_func_lstat_dereferences_slashed_symlink,$gl_cv_func_faccessat_never_eoverflows in
|
|
*yes,*yes) ;;
|
|
*) REPLACE_FACCESSAT=1 ;;
|
|
esac
|
|
fi
|
|
])
|
|
|
|
# Prerequisites of lib/faccessat.c.
|
|
AC_DEFUN([gl_PREREQ_FACCESSAT],
|
|
[
|
|
AC_CHECK_FUNCS([access])
|
|
])
|