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| author | Bruno Haible <bruno@clisp.org> | 2012-03-10 16:05:56 +0100 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2012-03-10 16:08:06 +0100 |
| commit | 14a3c6e4da8e6c5e65d0bba54cd42a91fd582603 (patch) | |
| tree | 3d28190eac440afcf939c2a961676058d19c846c /lib/logf.c | |
| parent | 204f9216c0518251439234fe17bd2f7798156aa3 (diff) | |
| download | gnulib-14a3c6e4da8e6c5e65d0bba54cd42a91fd582603.tar.gz | |
logf-ieee: Work around test failure on NetBSD 5.1.
* m4/logf-ieee.m4: New file.
* m4/logf.m4 (gl_FUNC_LOGF): If gl_FUNC_LOGF_IEEE is present, test
whether logf works with a negative argument. Replace it if not.
* lib/logf.c (logf): For negative arguments, return NaN.
* modules/logf-ieee (Files): Add m4/logf-ieee.m4.
(configure.ac): Invoke gl_FUNC_LOGF_IEEE.
* doc/posix-functions/logf.texi: Mention the logf-ieee module.
Diffstat (limited to 'lib/logf.c')
| -rw-r--r-- | lib/logf.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/lib/logf.c b/lib/logf.c index 3bf0f138fe..f2d5250f61 100644 --- a/lib/logf.c +++ b/lib/logf.c @@ -24,10 +24,17 @@ logf (float x) #undef logf { #if HAVE_LOGF - /* Work around the OSF/1 5.1 bug. */ - if (x == 0.0f) - /* Return -Infinity. */ - return -1.0f / 0.0f; + if (x <= 0.0f) + { + /* Work around the OSF/1 5.1 bug. */ + if (x == 0.0f) + /* Return -Infinity. */ + return -1.0f / 0.0f; + /* Work around the NetBSD 5.1 bug. */ + else /* x < 0.0 */ + /* Return NaN. */ + return 0.0f / 0.0f; + } return logf (x); #else return (float) log ((double) x); |