35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
# expf.m4
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# serial 4
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dnl Copyright (C) 2011-2024 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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dnl This file is offered as-is, without any warranty.
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AC_DEFUN([gl_FUNC_EXPF],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_EXP])
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dnl Persuade glibc <math.h> to declare expf().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether expf() exists. Assume that expf(), if it exists, is
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dnl defined in the same library as exp().
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saved_LIBS="$LIBS"
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LIBS="$LIBS $EXP_LIBM"
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AC_CHECK_FUNCS([expf])
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LIBS="$saved_LIBS"
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if test $ac_cv_func_expf = yes; then
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EXPF_LIBM="$EXP_LIBM"
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else
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HAVE_EXPF=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_expf, not expf.
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AC_CHECK_DECLS([expf], [REPLACE_EXPF=1], , [[#include <math.h>]])
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EXPF_LIBM="$EXP_LIBM"
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fi
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AC_SUBST([EXPF_LIBM])
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])
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