+2018-07-16 Bruno Haible <bruno@clisp.org>
+
+ ffs: Ensure declaration on mingw.
+ Reported by Daniel P. Berrangé <berrange@redhat.com>
+ in https://lists.gnu.org/archive/html/bug-gnulib/2018-07/msg00061.html.
+ * m4/ffs.m4 (gl_FUNC_FFS): Check whether ffs() not only exists but is
+ also declared.
+
2018-07-13 Paul Eggert <eggert@cs.ucla.edu>
regex-tests: add dependency
-# ffs.m4 serial 3
+# ffs.m4 serial 4
dnl Copyright (C) 2011-2018 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 We can't use AC_CHECK_FUNC here, because ffs() is defined as a
dnl static inline function when compiling for Android 4.2 or older.
+ dnl But require that ffs() is declared; otherwise we may be using
+ dnl the GCC built-in function, which leads to warnings
+ dnl "warning: implicit declaration of function 'ffs'".
AC_CACHE_CHECK([for ffs], [gl_cv_func_ffs],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <strings.h>
int x;
]],
- [[return ffs(x);]])
+ [[int (*func) (int) = ffs;
+ return func (x);
+ ]])
],
[gl_cv_func_ffs=yes],
[gl_cv_func_ffs=no])