43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
# copysignf.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_COPYSIGNF],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST])
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dnl Persuade glibc <math.h> to declare copysignf().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Determine COPYSIGNF_LIBM.
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gl_MATHFUNC([copysignf], [float], [(float, float)],
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[extern
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#ifdef __cplusplus
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"C"
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#endif
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float copysignf (float, float);
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])
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if test $gl_cv_func_copysignf_no_libm = yes \
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|| test $gl_cv_func_copysignf_in_libm = yes; then
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HAVE_COPYSIGNF=1
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dnl Also check whether it's declared.
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dnl IRIX 6.5 has copysignf() in libm but doesn't declare it in <math.h>.
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AC_CHECK_DECL([copysignf], , [HAVE_DECL_COPYSIGNF=0], [[#include <math.h>]])
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else
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HAVE_COPYSIGNF=0
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HAVE_DECL_COPYSIGNF=0
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dnl On HP-UX 11.31/ia64, cc has a built-in for copysignf that redirects
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dnl to the symbol '_copysignf', defined in libm, not libc.
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case "$host_os" in
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hpux*) COPYSIGNF_LIBM='-lm' ;;
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*) COPYSIGNF_LIBM= ;;
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esac
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fi
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AC_SUBST([COPYSIGNF_LIBM])
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])
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