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annotate m4/ceill.m4 @ 11386:23f58a4ffca0

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Followup to 2008-12-22: Remove unnecessary AC_FUNC_MBRTOWC invocations.
author Bruno Haible <bruno@clisp.org>
date Tue, 10 Mar 2009 01:19:40 +0100
parents 6dad92faecd1
children c2cbabec01dd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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6dad92faecd1 Avoid spurious "(cached)" in configure output.
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1 # ceill.m4 serial 4
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2 dnl Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_CEILL],
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8 [
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9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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10 dnl Persuade glibc <math.h> to declare ceill().
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11 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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12 dnl Test whether ceill() is declared.
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13 AC_CHECK_DECLS([ceill], , , [#include <math.h>])
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14 if test "$ac_cv_have_decl_ceill" = yes; then
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15 dnl Test whether ceill() can be used without libm.
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16 gl_FUNC_CEILL_LIBS
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17 if test "$CEILL_LIBM" = "?"; then
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18 dnl Sun C 5.0 on Solaris declares ceill() and has it in the system-wide
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19 dnl libm.so, but not in the libm.so that the compiler uses.
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20 REPLACE_CEILL=1
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21 fi
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22 else
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23 REPLACE_CEILL=1
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24 fi
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25 if test $REPLACE_CEILL = 1; then
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26 AC_LIBOBJ([ceill])
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27 CEILL_LIBM=
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28 fi
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29 AC_SUBST([REPLACE_CEILL])
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30 AC_SUBST([CEILL_LIBM])
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31 ])
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32
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33 # Determines the libraries needed to get the ceill() function.
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34 # Sets CEILL_LIBM.
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35 AC_DEFUN([gl_FUNC_CEILL_LIBS],
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36 [
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37 gl_CACHE_VAL_SILENT([gl_cv_func_ceill_libm], [
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38 gl_cv_func_ceill_libm=?
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39 AC_TRY_LINK([
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40 #ifndef __NO_MATH_INLINES
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41 # define __NO_MATH_INLINES 1 /* for glibc */
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42 #endif
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43 #include <math.h>
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44 long double x;],
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45 [x = ceill(x);],
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46 [gl_cv_func_ceill_libm=])
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47 if test "$gl_cv_func_ceill_libm" = "?"; then
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48 save_LIBS="$LIBS"
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49 LIBS="$LIBS -lm"
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50 AC_TRY_LINK([
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51 #ifndef __NO_MATH_INLINES
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52 # define __NO_MATH_INLINES 1 /* for glibc */
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53 #endif
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54 #include <math.h>
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55 long double x;],
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56 [x = ceill(x);],
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57 [gl_cv_func_ceill_libm="-lm"])
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58 LIBS="$save_LIBS"
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59 fi
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60 ])
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61 CEILL_LIBM="$gl_cv_func_ceill_libm"
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62 ])