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33 lines
1.0 KiB
Plaintext
33 lines
1.0 KiB
Plaintext
# tanf.m4 serial 3
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dnl Copyright (C) 2011-2017 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_TANF],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_TAN])
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dnl Persuade glibc <math.h> to declare tanf().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether tanf() exists. Assume that tanf(), if it exists, is
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dnl defined in the same library as tan().
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save_LIBS="$LIBS"
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LIBS="$LIBS $TAN_LIBM"
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AC_CHECK_FUNCS([tanf])
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LIBS="$save_LIBS"
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if test $ac_cv_func_tanf = yes; then
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TANF_LIBM="$TAN_LIBM"
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else
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HAVE_TANF=0
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dnl If the function is declared but does not appear to exist, it may be
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dnl defined as an inline function. In order to avoid a conflict, we have
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dnl to define rpl_tanf, not tanf.
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AC_CHECK_DECLS([tanf], [REPLACE_TANF=1], , [[#include <math.h>]])
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TANF_LIBM="$TAN_LIBM"
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fi
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AC_SUBST([TANF_LIBM])
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])
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