Mercurial > hg > octave-lojdl > gnulib-hg
changeset 9929:357b15084942
Adjust strtod detection to catch glibc 2.7 bug.
* m4/strtod.m4 (gl_FUNC_STRTOD): Test "nan()" behavior.
Reported by BuraphaLinux Server.
Signed-off-by: Eric Blake <ebb9@byu.net>
| author | Eric Blake <ebb9@byu.net> |
|---|---|
| date | Wed, 16 Apr 2008 19:28:29 -0600 |
| parents | 9a02133ad731 |
| children | 3f183c950e56 |
| files | ChangeLog m4/strtod.m4 |
| diffstat | 2 files changed, 23 insertions(+), 1 deletions(-) [+] |
line wrap: on
line diff
--- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2008-04-16 Eric Blake <ebb9@byu.net> + + Adjust strtod detection to catch glibc 2.7 bug. + * m4/strtod.m4 (gl_FUNC_STRTOD): Test "nan()" behavior. + Reported by BuraphaLinux Server. + 2008-04-16 Bruno Haible <bruno@clisp.org> Add tentative support for Linux libc5.
--- a/m4/strtod.m4 +++ b/m4/strtod.m4 @@ -1,4 +1,4 @@ -# strtod.m4 serial 8 +# strtod.m4 serial 9 dnl Copyright (C) 2002, 2003, 2006, 2007, 2008 Free Software dnl Foundation, Inc. dnl This file is free software; the Free Software Foundation @@ -19,6 +19,14 @@ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ #include <stdlib.h> #include <math.h> +/* Compare two numbers with ==. + This is a separate function because IRIX 6.5 "cc -O" miscompiles an + 'x == x' test. */ +static int +numeric_equal (double x, double y) +{ + return x == y; +} ]], [[ { /* Older glibc and Cygwin mis-parse "-0x". */ @@ -45,6 +53,14 @@ if (value != HUGE_VAL || term != (string + 3)) return 1; } + { + /* glibc 2.7 and cygwin 1.5.24 misparse "nan()". */ + const char *string = "nan()"; + char *term; + double value = strtod (string, &term); + if (numeric_equal (value, value) || term != (string + 5)) + return 1; + } ]])], [gl_cv_func_strtod_works=yes], [gl_cv_func_strtod_works=no],