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1 # truncf.m4 serial 1 |
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2 dnl Copyright (C) 2007 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_TRUNCF], |
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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 truncf(). |
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11 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
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12 dnl Test whether truncf() is declared. |
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13 AC_CHECK_DECLS([truncf], , , [#include <math.h>]) |
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14 if test "$ac_cv_have_decl_truncf" = yes; then |
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15 dnl Test whether truncf() can be used without libm. |
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16 TRUNCF_LIBM=? |
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17 AC_TRY_LINK([ |
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18 #ifndef __NO_MATH_INLINES |
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19 # define __NO_MATH_INLINES 1 /* for glibc */ |
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20 #endif |
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21 #include <math.h> |
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22 float x;], |
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23 [x = truncf(x);], |
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24 [TRUNCF_LIBM=]) |
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25 if test "$TRUNCF_LIBM" = "?"; then |
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26 save_LIBS="$LIBS" |
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27 LIBS="$LIBS -lm" |
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28 AC_TRY_LINK([ |
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29 #ifndef __NO_MATH_INLINES |
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30 # define __NO_MATH_INLINES 1 /* for glibc */ |
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31 #endif |
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32 #include <math.h> |
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33 float x;], |
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34 [x = truncf(x);], |
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35 [TRUNCF_LIBM="-lm"]) |
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36 LIBS="$save_LIBS" |
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37 fi |
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38 if test "$TRUNCF_LIBM" = "?"; then |
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39 TRUNCF_LIBM= |
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40 fi |
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41 else |
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42 HAVE_DECL_TRUNCF=0 |
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43 AC_LIBOBJ([truncf]) |
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44 TRUNCF_LIBM= |
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45 fi |
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46 AC_SUBST([HAVE_DECL_TRUNCF]) |
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47 AC_SUBST([TRUNCF_LIBM]) |
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48 ]) |
