I clarified some aspects of this proposal.
After consulting with Jakub Jelinek, I'm now proposing to use
“-march=i686 -msse2 -mtune=generic -mfpmath=sse -mstackrealign”. This
is very close to previous proposal. Only a few preprocessor macros are
different:
@@ -142,3 +142,2 @@
#define __FLT_RADIX__ 2
-#define __FXSR__ 1
#define __GCC_ASM_FLAG_OUTPUTS__ 1
@@ -174,2 +173,4 @@
#define i386 1
+#define __i686 1
+#define __i686__ 1
#define __INT16_C(c) c
@@ -219,4 +220,2 @@
#define __INT_WIDTH__ 32
-#define __k8 1
-#define __k8__ 1
#define __LDBL_DECIMAL_DIG__ 21
@@ -247,2 +246,4 @@
#define __ORDER_PDP_ENDIAN__ 3412
+#define __pentiumpro 1
+#define __pentiumpro__ 1
#define __PRAGMA_REDEFINE_EXTNAME 1
We still do not have a way to automatically test for the avoidance of
post-SSE2 CPU features (be it on i686 or x86_64), and i686 remains an
alternative architecture. Like before, unless the x86 SIG wants to
support non-SSE2 CPUs, they will not have to rebuild the i686 for the
i686 alternative architecture. They can use the existing builds we
create in Koji for the x86_64 multilib compose.
Thanks,
Florian
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