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Re: we are starting the wide int merge


Gerald Pfeifer <gerald@pfeifer.com> writes:
> On Sat, 17 May 2014, Richard Sandiford wrote:
>> To rule out one possibility: which GCC are you using for stage1?
>
> I think that may the smoking gun.  When I use GCC 4.7 to bootstrap,
> FreeBSD 8, 9 and 10 all build fine on i386 (= i486) and amd64.
>
> When I use the system compiler, which is GCC 4.2 on FreeBSD 8 and 9
> and clang on FreeBSD 10, things fail on FreeBSD 10...
>
> ...with a bootstrap comparison failure of stages 2 and 3 on i386:
> https://redports.org/~gerald/20140518230801-31619-208277/gcc410-4.10.0.s20140518.log

Do you get exactly the same comparison failures using clang and GCC 4.2
as the stage1 compiler?  That would rule out the system compiler
miscompiling stage1.

> In file included from .././../gcc-4.10-20140518/gcc/xcoffout.c:29:
> .././../gcc-4.10-20140518/gcc/tree.h:4576:3: warning: extraneous template 
> parameter list in template specialization
>   template <>
>   ^~~~~~~~~~~

Oops, fixed below, applied as obvious.

> .././../gcc-4.10-20140518/gcc/wide-int.cc:1274:23: error: invalid use of a 
> cast in a inline asm context requiring an l-value: remove the cast or 
> build with -fheinous-gnu-extensions
>           umul_ppmm (val[1], val[0], op1.ulow (), op2.ulow ());
>           ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This is PR 61146.  You can get around it by adding -fheinous-gnu-extensions
to BOOT_CFLAGS.

> This means this clang-based system is not able to bootstrap GCC trunk
> on amd64.
>
> Perhaps looking into this first may affect the failure on i486?

'Fraid it won't help.  We don't use umul_ppmm (or even include
longlong.h) for 486.

Thanks,
Richard


gcc/
	* tree.h: Remove extraneous template <>.

Index: gcc/tree.h
===================================================================
--- gcc/tree.h	2014-05-19 07:45:30.378667987 +0100
+++ gcc/tree.h	2014-05-19 07:46:07.364991104 +0100
@@ -4573,7 +4573,6 @@ #define ANON_AGGRNAME_FORMAT "__anon_%d"
     unsigned int get_len () const;
   };
 
-  template <>
   template <int N>
   struct int_traits <extended_tree <N> >
   {


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