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Merged revisions 68296,68299 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk ........ r68296 | mark.dickinson | 2009-01-04 12:29:36 +0000 (Sun, 04 Jan 2009) | 6 lines Add autoconf test to detect x87-style double rounding, as described in issue #2937. This information can be helpful for diagnosing platform- specific problems in math and cmath. The result of the test also serves as a fairly reliable indicator of whether the x87 floating-point instructions (as opposed to SSE2) are in use on Intel x86/x86_64 systems. ........ r68299 | mark.dickinson | 2009-01-04 13:57:26 +0000 (Sun, 04 Jan 2009) | 4 lines isinf and isnan are macros, not functions; fix configure script to use AC_CHECK_DECLS instead of AC_CHECK_FUNCS for these. (See discussion in issue #4506) ........
This commit is contained in:
Mark Dickinson
parent
277a150146
commit
3dc7c6a375
5 changed files with 358 additions and 21 deletions
297
configure
vendored
297
configure
vendored
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@ -1,5 +1,5 @@
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#! /bin/sh
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# From configure.in Revision: 67461 .
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# From configure.in Revision: 68245 .
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# Guess values for system-dependent variables and create Makefiles.
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# Generated by GNU Autoconf 2.61 for python 3.1.
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#
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@ -21214,6 +21214,94 @@ fi
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LIBS_SAVE=$LIBS
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LIBS="$LIBS $LIBM"
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# Detect whether system arithmetic is subject to x87-style double
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# rounding issues. The result of this test has little meaning on non
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# IEEE 754 platforms. On IEEE 754, test should return 1 if rounding
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# mode is round-to-nearest and double rounding issues are present, and
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# 0 otherwise. See http://bugs.python.org/issue2937 for more info.
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{ echo "$as_me:$LINENO: checking for x87-style double rounding" >&5
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echo $ECHO_N "checking for x87-style double rounding... $ECHO_C" >&6; }
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if test "${ac_cv_x87_double_rounding+set}" = set; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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if test "$cross_compiling" = yes; then
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ac_cv_x87_double_rounding=no
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else
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <stdlib.h>
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#include <math.h>
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int main() {
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volatile double x, y, z;
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/* 1./(1-2**-53) -> 1+2**-52 (correct), 1.0 (double rounding) */
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x = 0.99999999999999989; /* 1-2**-53 */
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y = 1./x;
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if (y != 1.)
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exit(0);
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/* 1e16+2.99999 -> 1e16+2. (correct), 1e16+4. (double rounding) */
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x = 1e16;
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y = 2.99999;
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z = x + y;
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if (z != 1e16+4.)
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exit(0);
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/* both tests show evidence of double rounding */
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exit(1);
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}
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_ACEOF
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rm -f conftest$ac_exeext
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if { (ac_try="$ac_link"
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case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
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(eval "$ac_link") 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } && { ac_try='./conftest$ac_exeext'
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{ (case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
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(eval "$ac_try") 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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ac_cv_x87_double_rounding=no
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else
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echo "$as_me: program exited with status $ac_status" >&5
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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( exit $ac_status )
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ac_cv_x87_double_rounding=yes
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fi
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rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
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fi
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fi
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{ echo "$as_me:$LINENO: result: $ac_cv_x87_double_rounding" >&5
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echo "${ECHO_T}$ac_cv_x87_double_rounding" >&6; }
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if test "$ac_cv_x87_double_rounding" = yes
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then
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cat >>confdefs.h <<\_ACEOF
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#define X87_DOUBLE_ROUNDING 1
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_ACEOF
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fi
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# On FreeBSD 6.2, it appears that tanh(-0.) returns 0. instead of
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# -0. on some architectures.
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{ echo "$as_me:$LINENO: checking whether tanh preserves the sign of zero" >&5
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@ -21400,9 +21488,7 @@ done
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for ac_func in acosh asinh atanh copysign expm1 finite isinf isnan log1p
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for ac_func in acosh asinh atanh copysign expm1 finite log1p
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do
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as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
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{ echo "$as_me:$LINENO: checking for $ac_func" >&5
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@ -21495,6 +21581,209 @@ _ACEOF
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fi
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done
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{ echo "$as_me:$LINENO: checking whether isinf is declared" >&5
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echo $ECHO_N "checking whether isinf is declared... $ECHO_C" >&6; }
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if test "${ac_cv_have_decl_isinf+set}" = set; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <math.h>
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int
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main ()
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{
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#ifndef isinf
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(void) isinf;
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#endif
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (ac_try="$ac_compile"
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case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
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(eval "$ac_compile") 2>conftest.er1
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ac_status=$?
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grep -v '^ *+' conftest.er1 >conftest.err
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rm -f conftest.er1
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cat conftest.err >&5
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } && {
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test -z "$ac_c_werror_flag" ||
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test ! -s conftest.err
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} && test -s conftest.$ac_objext; then
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ac_cv_have_decl_isinf=yes
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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ac_cv_have_decl_isinf=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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{ echo "$as_me:$LINENO: result: $ac_cv_have_decl_isinf" >&5
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echo "${ECHO_T}$ac_cv_have_decl_isinf" >&6; }
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if test $ac_cv_have_decl_isinf = yes; then
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cat >>confdefs.h <<_ACEOF
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#define HAVE_DECL_ISINF 1
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_ACEOF
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else
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cat >>confdefs.h <<_ACEOF
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#define HAVE_DECL_ISINF 0
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_ACEOF
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fi
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{ echo "$as_me:$LINENO: checking whether isnan is declared" >&5
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echo $ECHO_N "checking whether isnan is declared... $ECHO_C" >&6; }
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if test "${ac_cv_have_decl_isnan+set}" = set; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <math.h>
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int
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main ()
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{
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#ifndef isnan
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(void) isnan;
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#endif
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (ac_try="$ac_compile"
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case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
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(eval "$ac_compile") 2>conftest.er1
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ac_status=$?
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grep -v '^ *+' conftest.er1 >conftest.err
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rm -f conftest.er1
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cat conftest.err >&5
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } && {
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test -z "$ac_c_werror_flag" ||
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test ! -s conftest.err
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} && test -s conftest.$ac_objext; then
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ac_cv_have_decl_isnan=yes
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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ac_cv_have_decl_isnan=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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{ echo "$as_me:$LINENO: result: $ac_cv_have_decl_isnan" >&5
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echo "${ECHO_T}$ac_cv_have_decl_isnan" >&6; }
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if test $ac_cv_have_decl_isnan = yes; then
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cat >>confdefs.h <<_ACEOF
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#define HAVE_DECL_ISNAN 1
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_ACEOF
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else
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cat >>confdefs.h <<_ACEOF
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#define HAVE_DECL_ISNAN 0
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_ACEOF
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fi
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{ echo "$as_me:$LINENO: checking whether isfinite is declared" >&5
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echo $ECHO_N "checking whether isfinite is declared... $ECHO_C" >&6; }
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if test "${ac_cv_have_decl_isfinite+set}" = set; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <math.h>
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int
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main ()
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{
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#ifndef isfinite
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(void) isfinite;
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#endif
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (ac_try="$ac_compile"
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case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
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(eval "$ac_compile") 2>conftest.er1
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ac_status=$?
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grep -v '^ *+' conftest.er1 >conftest.err
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rm -f conftest.er1
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cat conftest.err >&5
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } && {
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test -z "$ac_c_werror_flag" ||
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test ! -s conftest.err
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} && test -s conftest.$ac_objext; then
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ac_cv_have_decl_isfinite=yes
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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ac_cv_have_decl_isfinite=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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{ echo "$as_me:$LINENO: result: $ac_cv_have_decl_isfinite" >&5
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echo "${ECHO_T}$ac_cv_have_decl_isfinite" >&6; }
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if test $ac_cv_have_decl_isfinite = yes; then
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cat >>confdefs.h <<_ACEOF
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#define HAVE_DECL_ISFINITE 1
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_ACEOF
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else
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cat >>confdefs.h <<_ACEOF
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#define HAVE_DECL_ISFINITE 0
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_ACEOF
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fi
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LIBS=$LIBS_SAVE
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