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33 lines
948 B
Plaintext
33 lines
948 B
Plaintext
# exp2f.m4
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# serial 3
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dnl Copyright (C) 2011-2026 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_EXP2F],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_EXP2])
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dnl Persuade glibc <math.h> to declare exp2f().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether exp2f() exists. Assume that exp2f(), if it exists, is
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dnl defined in the same library as exp2().
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saved_LIBS="$LIBS"
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LIBS="$LIBS $EXP2_LIBM"
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AC_CHECK_FUNCS([exp2f])
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LIBS="$saved_LIBS"
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if test $ac_cv_func_exp2f = yes; then
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HAVE_EXP2F=1
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EXP2F_LIBM="$EXP2_LIBM"
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else
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HAVE_EXP2F=0
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dnl Find libraries needed to link lib/exp2f.c.
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EXP2F_LIBM="$EXP2_LIBM"
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fi
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AC_SUBST([EXP2F_LIBM])
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])
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