The appended patch fixes the root cause. gcc -O2 optimizes out some
tests.
Thiemo
--- libcaca-0.99.beta15/configure.ac~ 2008-09-27 19:11:55.000000000 +0100
+++ libcaca-0.99.beta15/configure.ac 2008-10-03 10:21:19.000000000 +0100
@@ -112,13 +112,13 @@ AC_TRY_COMPILE([#include <windows.h>],[S
[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for fsin/fcos)
-AC_TRY_COMPILE([],[double x; asm("fsin\n\tfcos":"=t"(x):);],
+AC_TRY_COMPILE([],[double x; volatile asm("fsin\n\tfcos":"=t"(x):);],
[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FSIN_FCOS, 1, [Define to 1 if you have the `fsin' and `fcos'
operands.])],
[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for fldln2/fxch/fyl2x)
-AC_TRY_COMPILE([],[double x; asm("fldln2; fldln2; fxch; fyl2x":"=t"(x):);],
+AC_TRY_COMPILE([],[double x; volatile asm("fldln2; fldln2; fxch;
fyl2x":"=t"(x):);],
[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FLDLN2, 1, [Define to 1 if you have the `fldln2' and other
floating points operands.])],
[AC_MSG_RESULT(no)])
--- libcaca-0.99.beta15.old/configure 2008-09-27 21:30:35.000000000 +0000
+++ libcaca-0.99.beta15/configure 2008-10-03 09:25:04.000000000 +0000
@@ -21854,7 +21854,7 @@ cat >>conftest.$ac_ext <<_ACEOF
int
main ()
{
-double x; asm("fsin\n\tfcos":"=t"(x):);
+double x; volatile asm("fsin\n\tfcos":"=t"(x):);
;
return 0;
}
@@ -21905,7 +21905,7 @@ cat >>conftest.$ac_ext <<_ACEOF
int
main ()
{
-double x; asm("fldln2; fldln2; fxch; fyl2x":"=t"(x):);
+double x; volatile asm("fldln2; fldln2; fxch; fyl2x":"=t"(x):);
;
return 0;
}
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