[libgfortran,committed] Remove use of HAVE_MATH_H in acinclude.m4

[FX Coudert]

Checks for broken isfinite(), isnan() and fpclassify() in libgfortran/ 
acinclude.m4 include <math.h> conditionaly on HAVE_MATH_H being  
defined (original patch by Stevel Ellcey, http://gcc.gnu.org/ml/ 
fortran/2005-09/msg00443.html, okayed by yours truly). Unfortunately,  
HAVE_MATH_H is never defined, ever. Thus, the tests are done without  
including <math.h>, and can sometimes give wrong results (one example  
being powerpc-apple-darwin9.2.0, see comment #28 in PR 32841).

The patch below, committed as rev. 132587 after bootstrap on powerpc- 
apple-darwin9.2.0, fixes that issue. (And that's my first 2008  
library patch!)

FX



2008-02-24  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>

         PR libfortran/32841
         * acinclude.m4: Don't use HAVE_MATH_H.
         * configure: Regenerate.


Index: acinclude.m4
===================================================================
--- acinclude.m4        (revision 132578)
+++ acinclude.m4        (working copy)
@@ -204,9 +204,7 @@
    libgfor_check_for_broken_isfinite_save_LIBS=$LIBS
    LIBS="$LIBS -lm"
    AC_TRY_RUN([
-#ifdef HAVE_MATH_H
  #include <math.h>
-#endif
  #include <float.h>
  int main ()
  {
@@ -237,9 +235,7 @@
    libgfor_check_for_broken_isnan_save_LIBS=$LIBS
    LIBS="$LIBS -lm"
    AC_TRY_RUN([
-#ifdef HAVE_MATH_H
  #include <math.h>
-#endif
  #include <float.h>
  int main ()
  {
@@ -288,9 +284,7 @@
    libgfor_check_for_broken_fpclassify_save_LIBS=$LIBS
    LIBS="$LIBS -lm"
    AC_TRY_RUN([
-#ifdef HAVE_MATH_H
  #include <math.h>
-#endif
  #include <float.h>
  int main ()
  {


-- 
François-Xavier Coudert
http://www.homepages.ucl.ac.uk/~uccafco/