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# ffsl.m4 serial 3
dnl Copyright (C) 2011-2023 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.
AC_DEFUN([gl_FUNC_FFSL],
[
AC_REQUIRE([gl_STRING_H_DEFAULTS])
dnl Persuade glibc <string.h> to declare ffsl().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
dnl We can't use AC_CHECK_FUNC here, because ffsl() is defined as a
dnl static inline function when compiling for Android 13 or older.
dnl But require that ffsl() is declared; otherwise we may be using
dnl the GCC built-in function, which leads to warnings
dnl "warning: implicit declaration of function 'ffsl'".
AC_CACHE_CHECK([for ffsl], [gl_cv_func_ffsl],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <string.h>
#include <strings.h>
long x;
]],
[[int (*func) (long) = ffsl;
return func (x);
]])
],
[gl_cv_func_ffsl=yes],
[gl_cv_func_ffsl=no])
])
if test $gl_cv_func_ffsl = no; then
HAVE_FFSL=0
fi
])
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