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33 lines
1.0 KiB
Plaintext
33 lines
1.0 KiB
Plaintext
# ffs.m4 serial 5
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dnl Copyright (C) 2011-2022 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_FFS],
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[
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AC_REQUIRE([gl_STRINGS_H_DEFAULTS])
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dnl We can't use AC_CHECK_FUNC here, because ffs() is defined as a
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dnl static inline function when compiling for Android 4.2 or older.
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dnl But require that ffs() is declared; otherwise we may be using
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dnl the GCC built-in function, which leads to warnings
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dnl "warning: implicit declaration of function 'ffs'".
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AC_CACHE_CHECK([for ffs], [gl_cv_func_ffs],
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[AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <strings.h>
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int x;
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]],
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[[int (*func) (int) = ffs;
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return func (x);
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]])
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],
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[gl_cv_func_ffs=yes],
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[gl_cv_func_ffs=no])
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])
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if test $gl_cv_func_ffs = no; then
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HAVE_FFS=0
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fi
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])
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