2010/7/28 Dongsheng Song <dongsheng.s...@gmail.com>:
> 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.
>
> 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
>
>
Well, yes it is a gcc bug in respect to native/cross toolchains. I
assume that your search path installs headers (and libraries) in
standard_include for native. This cause that the system-headers get
included before fixed-include and gcc-include.
For this I can provide a patch. See revision 2986. But indeed this
include-order of gcc is a conceptional flaw.
Cheers,
Kai
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