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| author | Eric Blake <ebb9@byu.net> | 2008-04-12 07:22:40 -0600 |
|---|---|---|
| committer | Eric Blake <ebb9@byu.net> | 2008-04-12 07:28:35 -0600 |
| commit | 833333f7edfb45487d4a2cbae9f5e611c0c542cf (patch) | |
| tree | 571fe560b473cd9ab9c93b81c10d5816aead3553 /m4/math_h.m4 | |
| parent | b2cf43d6c45193102d4c90fc82007f15c1e98e47 (diff) | |
| download | gnulib-833333f7edfb45487d4a2cbae9f5e611c0c542cf.tar.gz | |
Work around Solaris 10 math.h bug.
* m4/math_h.m4 (gl_MATH_H): Check for bug.
(gl_MATH_H_DEFAULTS): Set up default.
* modules/math (Makefile.am): Replace new indicators.
* lib/math.in.h (NAN, HUGE_VAL): Provide replacements.
* tests/test-math.c (main): Test this.
* m4/strtod.m4 (gl_FUNC_STRTOD): Don't rely on HUGE_VAL.
* doc/posix-headers/math.texi (math.h): Mention bug.
Reported by Nelson H. F. Beebe and Jim Meyering.
Signed-off-by: Eric Blake <ebb9@byu.net>
Diffstat (limited to 'm4/math_h.m4')
| -rw-r--r-- | m4/math_h.m4 | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/m4/math_h.m4 b/m4/math_h.m4 index dd99e7f2d7..3090b6e863 100644 --- a/m4/math_h.m4 +++ b/m4/math_h.m4 @@ -1,4 +1,4 @@ -# math_h.m4 serial 9 +# math_h.m4 serial 10 dnl Copyright (C) 2007-2008 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -8,6 +8,31 @@ AC_DEFUN([gl_MATH_H], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) gl_CHECK_NEXT_HEADERS([math.h]) + AC_CACHE_CHECK([whether NAN macro works], [gl_cv_header_math_nan_works], + [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([@%:@include <math.h>], + [[/* Solaris 10 has a broken definition of NAN. Other platforms + fail to provide NAN, or provide it only in C99 mode; this + test only needs to fail when NAN is provided but wrong. */ + float f = 1.0f; +#ifdef NAN + f = NAN; +#endif + return f == 0;]])], + [gl_cv_header_math_nan_works=yes], + [gl_cv_header_math_nan_works=no])]) + if test gl_cv_header_math_nan_works = no; then + REPLACE_NAN=1 + fi + AC_CACHE_CHECK([whether HUGE_VAL works], [gl_cv_header_math_huge_val_works], + [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([@%:@include <math.h>], + [[/* Solaris 10 has a broken definition of HUGE_VAL. */ + double d = HUGE_VAL; + return d == 0;]])], + [gl_cv_header_math_huge_val_works=yes], + [gl_cv_header_math_huge_val_works=no])]) + if test gl_cv_header_math_huge_val_works = no; then + REPLACE_HUGE_VAL=1 + fi ]) AC_DEFUN([gl_MATH_MODULE_INDICATOR], @@ -56,8 +81,10 @@ AC_DEFUN([gl_MATH_H_DEFAULTS], REPLACE_FLOORL=0; AC_SUBST([REPLACE_FLOORL]) REPLACE_FREXP=0; AC_SUBST([REPLACE_FREXP]) REPLACE_FREXPL=0; AC_SUBST([REPLACE_FREXPL]) + REPLACE_HUGE_VAL=0; AC_SUBST([REPLACE_HUGE_VAL]) REPLACE_ISFINITE=0; AC_SUBST([REPLACE_ISFINITE]) REPLACE_LDEXPL=0; AC_SUBST([REPLACE_LDEXPL]) + REPLACE_NAN=0; AC_SUBST([REPLACE_NAN]) REPLACE_ROUND=0; AC_SUBST([REPLACE_ROUND]) REPLACE_ROUNDF=0; AC_SUBST([REPLACE_ROUNDF]) REPLACE_ROUNDL=0; AC_SUBST([REPLACE_ROUNDL]) |