2013-11-26 22:56:50 +00:00
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# floorf.m4 serial 4
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dnl Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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2013-11-26 22:55:28 +00:00
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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_FLOORF],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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dnl Persuade glibc <math.h> to declare floorf().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether floorf() is declared.
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AC_CHECK_DECLS([floorf], , , [#include <math.h>])
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if test "$ac_cv_have_decl_floorf" = yes; then
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dnl Test whether floorf() can be used without libm.
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gl_FUNC_FLOORF_LIBS
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if test "$FLOORF_LIBM" = "?"; then
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dnl Sun C 5.0 on Solaris declares floorf() and has it in the system-wide
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dnl libm.so, but not in the libm.so that the compiler uses.
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REPLACE_FLOORF=1
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fi
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else
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REPLACE_FLOORF=1
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fi
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if test $REPLACE_FLOORF = 1; then
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AC_LIBOBJ([floorf])
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FLOORF_LIBM=
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fi
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AC_SUBST([REPLACE_FLOORF])
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AC_SUBST([FLOORF_LIBM])
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])
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# Determines the libraries needed to get the floorf() function.
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# Sets FLOORF_LIBM.
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AC_DEFUN([gl_FUNC_FLOORF_LIBS],
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[
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2013-11-26 22:56:50 +00:00
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gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [
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2013-11-26 22:55:28 +00:00
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gl_cv_func_floorf_libm=?
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AC_TRY_LINK([
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#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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float x;],
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[x = floorf(x);],
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[gl_cv_func_floorf_libm=])
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if test "$gl_cv_func_floorf_libm" = "?"; then
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save_LIBS="$LIBS"
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LIBS="$LIBS -lm"
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AC_TRY_LINK([
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#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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float x;],
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[x = floorf(x);],
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[gl_cv_func_floorf_libm="-lm"])
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LIBS="$save_LIBS"
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fi
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])
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FLOORF_LIBM="$gl_cv_func_floorf_libm"
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])
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