2010/7/28 Ozkan Sezer <seze...@gmail.com>:
> On Wed, Jul 28, 2010 at 10:54 AM, Dongsheng Song
> <dongsheng.s...@gmail.com> wrote:
>> 于 2010-7-28 15:43, Kai Tietz 写道:
>>> 2010/7/28 Dongsheng Song <dongsheng.s...@gmail.com>:
>>>> Hi Kai,
>>>>
>>>> When we cross build gcc 4.5 for windows, I found we can build windows gcc
>>>> binary one
>>>> week ago, but now the build failed.
>>>>
>>>> After I do a binary search, I found the issue caused by r2945.
>>>>
>>>> r2950 | 2010-07-24 05:50:28 | FAILED
>>>> r2945 | 2010-07-24 02:44:15 | FAILED
>>>> r2944 | 2010-07-24 02:38:30 | SUCCESS
>>>> r2939 | 2010-07-23 17:55:30 | SUCCESS
>>>> r2928 | 2010-07-23 05:21:20 | SUCCESS
>>>> r2924 | 2010-07-22 18:32:25 | SUCCESS
>>>>
>>>> r2945 remove some *IMPORTANT* macros from
>>>> /trunk/mingw-w64-headers/crt/float.h,
>>>> e.g. FLT/DBL/LDBL_MANT_DIG, FLT_EVAL_METHOD, *ALL* decimal macros
>>>> (DEC32/64/128_*, ...)
>>>>
>>>> When I add FLT/DBL/LDBL_MANT_DIG and FLT_EVAL_METHOD back to
>>>> /trunk/mingw-w64-headers/crt/float.h,
>>>> then the gcc cross build success again.
>>>>
>>>> So I recommend you apply the attached patch at least.
>>>>
>>>> btw, I know FLT_EVAL_METHOD added by C99, but libgfortran/m4/nearest.m4
>>>> use it,
>>>> is it mean we should use ISO C99 compiler to build gcc 4.5 or later, not
>>>> ISO C90 as
>>>> http://gcc.gnu.org/install/prerequisites.html ?
>>>>
>>>> Regards,
>>>> Dongsheng
>>>
>>> Hello Dongsheng,
>>>
>>> the recent change to float.h was necessary to support the new
>>> include_next patch of 4.6. So how are you exactly installing headers?
>>> As usual you should just see gcc's internal float.h for older gcc's
>>> then 4.6. So I am a bit puzzled. Are you removing gcc's float.h here?
>>>
>>> Regards,
>>> Kai
>>>
>>
>> Hi Kai,
>>
>> I use Debian 6.0 i686 with latest update, gcc 4.4.4 build a gcc 4.5 cross
>> compiler for windows,
>> then use the cross compiler to build a native gcc 4.5 compiler for windows.
>>
>
> You cannot build 4.4/4.5 based compilers against the mingw-w64-headers
> from the trunk unless you patch your gcc according to gcc PR/41943
>
>> Without the patch, both i686-windows and x64-windows failed during build
>> native
>> compiler.
>>
>> It's strange since I can build cross compiler, it maybe a gcc bug.
>>
>> The related packages is:
>> gcc 4.5 branch, mingw64 trunk, binutils trunk, gmp 5.0 branch, mpfr 3.0
>> branch,
>> mpc 0.8.2, ppl 0.10.2, cloog-ppl 0.15.9.
>>
>> Regards,
>> Dongsheng
>>
>
> --
> Ozkan
>
The problematic thing here is, that for cross-compiler and native
different include dependencies are there. So it is absolutely
unpredicatable (for now), if toolchain's header are used in native (so
the float.h/stddef.h etc are seen first from system-headers), or if it
is by a cross-toolchain, which has in front the gcc-internal header
versions of those files.
All in all it is simply a mess.
Kai
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