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# ffsll.m4 serial 5
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_FFSLL],
[
AC_REQUIRE([gl_STRING_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc <string.h> and AIX <strings.h> to declare ffsll().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
dnl We can't use AC_CHECK_FUNC here, because ffsll() is defined as a
dnl static inline function when compiling for Android 13 or older.
dnl But require that ffsll() is declared; otherwise we may be using
dnl the GCC built-in function, which leads to warnings
dnl "warning: implicit declaration of function 'ffsll'".
AC_CACHE_CHECK([for ffsll], [gl_cv_func_ffsll],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <string.h>
#include <strings.h>
long long x;
]],
[[int (*func) (long long) = ffsll;
return func (x);
]])
],
[gl_cv_func_ffsll=yes],
[gl_cv_func_ffsll=no])
])
if test $gl_cv_func_ffsll = yes; then
dnl Test whether ffsll works.
dnl On AIX 7.2 in 32-bit mode it is completely broken.
AC_CACHE_CHECK([whether ffsll works],
[gl_cv_func_ffsll_works],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <string.h>
#include <strings.h>
int dummy (long long x) { return 42; }
int main (int argc, char *argv[])
{
int (* volatile my_ffsll) (long long) = argc ? ffsll : dummy;
long long int x = -128LL;
return my_ffsll (x) != 8;
}
]])],
[gl_cv_func_ffsll_works=yes],
[gl_cv_func_ffsll_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_ffsll_works="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_ffsll_works="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_ffsll_works="guessing yes" ;;
# Guess no on AIX.
aix*) gl_cv_func_ffsll_works="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_ffsll_works="$gl_cross_guess_normal" ;;
esac
])
])
case "$gl_cv_func_ffsll_works" in
*yes) ;;
*) REPLACE_FFSLL=1 ;;
esac
else
HAVE_FFSLL=0
fi
])
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