[Clfs-dev] GCC Host Requirement Issue

[Martin Ward]

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