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| author | Bruno Haible <bruno@clisp.org> | 2011-10-19 11:09:37 +0200 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2011-10-19 11:23:48 +0200 |
| commit | 4d699c3727abd33573584053c3d272b92f5b4f1a (patch) | |
| tree | fc52ed61757f13f14cd9bd8e081722eb8eb68a98 /m4/frexp.m4 | |
| parent | 209a1a065ec056c35f30f1127e7255e49c7ab662 (diff) | |
| download | gnulib-4d699c3727abd33573584053c3d272b92f5b4f1a.tar.gz | |
Support for old NeXTstep 3.3 frexp().
* m4/frexp.m4 (gl_FUNC_FREXP_WORKS): Check for alarm. Limit the
execution time of the test to 5 seconds.
Reported by Daniel Richard G. <skunk@iskunk.org>.
Diffstat (limited to 'm4/frexp.m4')
| -rw-r--r-- | m4/frexp.m4 | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/m4/frexp.m4 b/m4/frexp.m4 index f2048f3be3..b0bdd106b0 100644 --- a/m4/frexp.m4 +++ b/m4/frexp.m4 @@ -1,4 +1,4 @@ -# frexp.m4 serial 12 +# frexp.m4 serial 13 dnl Copyright (C) 2007-2011 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -93,6 +93,7 @@ AC_DEFUN([gl_FUNC_FREXP_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CHECK_FUNCS_ONCE([alarm]) AC_CACHE_CHECK([whether frexp works], [gl_cv_func_frexp_works], [ AC_RUN_IFELSE( @@ -100,6 +101,9 @@ AC_DEFUN([gl_FUNC_FREXP_WORKS], #include <float.h> #include <math.h> #include <string.h> +#if HAVE_ALARM +# include <unistd.h> +#endif /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0. ICC 10.0 has a bug when optimizing the expression -zero. The expression -DBL_MIN * DBL_MIN does not work when cross-compiling @@ -120,6 +124,11 @@ int main() int i; volatile double x; double zero = 0.0; +#if HAVE_ALARM + /* NeXTstep 3.3 frexp() runs into an endless loop when called on an infinite + number. Let the test fail in this case. */ + alarm (5); +#endif /* Test on denormalized numbers. */ for (i = 1, x = 1.0; i >= DBL_MIN_EXP; i--, x *= 0.5) ; |