Assume C89 or later for math functions.

This simplifies the code, and makes it a bit smaller and faster,
and (most important) makes it easier to clean up signal handling
since we can stop worring about floating-point exceptions in
library code.  That was a problem before C89, but the problem
went away many years ago on all practical Emacs targets.
* configure.ac (frexp, fmod): Remove checks for these functions,
as we now assume them.
(FLOAT_CHECK_DOMAIN, HAVE_INVERSE_HYPERBOLIC, NO_MATHERR)
(HAVE_EXCEPTION):
Remove; no longer needed.
* admin/CPP-DEFINES (HAVE_FMOD, HAVE_FREXP, FLOAT_CHECK_DOMAIN)
(HAVE_INVERSE_HYPERBOLIC, NO_MATHERR): Remove.
* src/data.c, src/image.c, src/lread.c, src/print.c:
Don't include <math.h>; no longer needed.
* src/data.c, src/floatfns.c (IEEE_FLOATING_POINT): Don't worry that it
might be autoconfigured, as that never happens.
* src/data.c (fmod):
* src/doprnt.c (DBL_MAX_10_EXP):
* src/print.c (DBL_DIG):
Remove.  C89 or later always defines these.
* src/floatfns.c (HAVE_MATHERR, FLOAT_CHECK_ERRNO, FLOAT_CHECK_DOMAIN)
(in_float, float_error_arg, float_error_arg2, float_error_fn_name)
(arith_error, domain_error, domain_error2):
Remove all this pre-C89 cruft.  Do not include <errno.h> as that's
no longer needed -- we simply return what C returns.  All uses removed.
(IN_FLOAT, IN_FLOAT2): Remove.  All uses replaced with
the wrapped code.
(FLOAT_TO_INT, FLOAT_TO_INT2, range_error, range_error2):
Remove.  All uses expanded, as these macros are no longer used
more than once and are now more trouble than they're worth.
(Ftan): Use tan, not sin / cos.
(Flogb): Assume C89 frexp.
(fmod_float): Assume C89 fmod.
(matherr) [HAVE_MATHERR]: Remove; no longer needed.
(init_floatfns): Remove.  All uses removed.

1 files changed, 32 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 56b96fda519..ae99fcc138d 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,35 @@
+2012-09-09  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Assume C89 or later for math functions (Bug#12381).
+        This simplifies the code, and makes it a bit smaller and faster,
+        and (most important) makes it easier to clean up signal handling
+        since we can stop worring about floating-point exceptions in
+        library code.  That was a problem before C89, but the problem
+        went away many years ago on all practical Emacs targets.
+        * data.c, image.c, lread.c, print.c:
+        Don't include <math.h>; no longer needed.
+        * data.c, floatfns.c (IEEE_FLOATING_POINT): Don't worry that it
+        might be autoconfigured, as that never happens.
+        * data.c (fmod):
+        * doprnt.c (DBL_MAX_10_EXP):
+        * print.c (DBL_DIG):
+        Remove.  C89 or later always defines these.
+        * floatfns.c (HAVE_MATHERR, FLOAT_CHECK_ERRNO, FLOAT_CHECK_DOMAIN)
+        (in_float, float_error_arg, float_error_arg2, float_error_fn_name)
+        (arith_error, domain_error, domain_error2):
+        Remove all this pre-C89 cruft.  Do not include <errno.h> as that's
+        no longer needed -- we simply return what C returns.  All uses removed.
+        (IN_FLOAT, IN_FLOAT2): Remove.  All uses replaced with
+        the wrapped code.
+        (FLOAT_TO_INT, FLOAT_TO_INT2, range_error, range_error2):
+        Remove.  All uses expanded, as these macros are no longer used
+        more than once and are now more trouble than they're worth.
+        (Ftan): Use tan, not sin / cos.
+        (Flogb): Assume C89 frexp.
+        (fmod_float): Assume C89 fmod.
+        (matherr) [HAVE_MATHERR]: Remove; no longer needed.
+        (init_floatfns): Remove.  All uses removed.
+
 2012-09-08  Jan Djärv  <jan.h.d@swipnet.se>
 
         * nsterm.m (ns_draw_fringe_bitmap, ns_dumpglyphs_image): Take back