[Clfs-dev] GCC Host Requirement Issue

[Martin Ward]

On 13/09/13 17:32, William Harrington wrote:
>
> On Aug 12, 2013, at 8:58 AM, Martin Ward wrote:
>
>> On 12/08/13 06:07, William Harrington wrote:
>>> Greetings devs,
>>>
>>> We have a slight problem in gcc temp system:
>>>
>>> g++ -c   -g -O2 -DIN_GCC   -fno-exceptions -fno-rtti 
>>> -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings 
>>> -Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long 
>>> -Wno-variadic-macros -Wno-overlength-strings -DHAVE_CONFIG_H 
>>> -DGENERATOR_FILE -I. -Ibuild -I../../gcc-4.8.1/gcc 
>>> -I../../gcc-4.8.1/gcc/build -I../../gcc-4.8.1/gcc/../include 
>>> -I../../gcc-4.8.1/gcc/../libcpp/include -I/cross-tools/include 
>>> -I/cross-tools/include -I/cross-tools/include 
>>> -I../../gcc-4.8.1/gcc/../libdecnumber 
>>> -I../../gcc-4.8.1/gcc/../libdecnumber/dpd -I../libdecnumber 
>>> -I../../gcc-4.8.1/gcc/../libbacktrace -DCLOOG_INT_GMP 
>>> -I/cross-tools/include -I/cross-tools/include  \
>>>                -o build/genconstants.o 
>>> ../../gcc-4.8.1/gcc/genconstants.c
>>> cc1plus: error: unrecognized command line option "-Wno-narrowing"
>>> cc1plus: error: unrecognized command line option 
>>> "-Wno-overlength-strings"
>>>
>>> The host compiler is used to create some host build tools for the 
>>> gcc build.
>>>
>>> Thus, it'll run g++ which will be the host's gcc.
>>>
>>> I was using the updated lfs livecd I recently put linux 3.10.5 onto, 
>>> and it seems moving to gcc-4.8.1 we have Wno error checking going bad.
>>>
>>> The following dialect options are only available starting with gcc 4.7:
>>>
>>> -Wno-narrowing  and -Wno-overlength-strings
>>>
>>>
>>> This is going to cause some problems with hosts using GCC < 4.7.
>>>
>>> In config/warnings.m4 there is this change that is already in gcc 
>>> 4.8.1:
>>>
>>> for real_option in $1; do
>>>  # Do the check with the no- prefix removed since gcc silently
>>>  # accepts any -Wno-* option on purpose
>>>  case $real_option in
>>> -    -Wno-*) option=-W`expr $real_option : '-Wno-\(.*\)'` ;;
>>> +   -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;;
>>>    *) option=$real_option ;;
>>>  esac
>>>
>>> I tried the old Wno line but it didn't help.
>>>
>>> Any ideas how we will get past this?
>>>
>>> We can remove -Wno-narrowing and -Wno-overlength-strings from 
>>> gcc/Makefile
>>>
>>> Upping the host system requirements to gcc 4.7 is a bit extreme.
>>>
>>> Sincerely,
>>>
>>> WIlliam Harrington
>>> _______________________________________________
>>> Clfs-dev mailing list
>>> Clfs-dev at lists.cross-lfs.org
>>> http://lists.cross-lfs.org/listinfo.cgi/clfs-dev-cross-lfs.org
>>>
>> Hmm just run through two builds, because i forgot the specs path when 
>> compiling the final gcc and never ran into that
>>
>> I do remember seeing the line but is was as a  warning, rather than 
>> and error, how about having
>>
>> |--disable-werror added?|
>>
>>
>> martin
>
> It was supposed to be fixed by now but it isn't. If the host compiler 
> does not support Wno-narrowing or Wno-overlength-strings then the 
> build will fail. In my case, I'm using the updated livecd, which uses 
> GCC-4.1.2 and meets our host system requirements.
>
> I found this which fixes the problem.
>
> https://github.com/openembedded/oe-core/blob/master/meta/recipes-devtools/gcc/gcc-4.8/0038-gcc-4.8-build-args.patch 
>
>
> It looks we are going to need this or see if it is applied upstream. 
> It is going to be an issue.

looks good to me, probably wasn't seeing because i was using 4.4.x
>
> Sincerely,
>
> William Harrington
>
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>
regards

Martin