Re: using gcc -w

[David Brownlee <abs%absd.org@localhost>]

On 14 March 2015 at 11:41, Patrick Welche <prlw1%cam.ac.uk@localhost> wrote:
> On Fri, Mar 13, 2015 at 09:27:47AM +0000, Patrick Welche wrote:
>> Part of the point of build.sh is to build the compiler of the same
>> vintage as the rest of the code. I am getting stuck trying to build
>> ancient versions of NetBSD because the -current gcc compiler emits
>> so many warnings which are treated as fatal that the old tools fail
>> to build. "build.sh tools" ends up failing on silly things like:
>>
>> --- elf.lo ---
>> /bin/sh ./libtool --tag=CC --mode=compile cc -DHAVE_CONFIG_H  -I. -I/usr/src/loc
>> al/netbsd/src/tools/binutils/../../external/gpl3/binutils/dist/bfd -I. -I. -I/us
>> r/src/local/netbsd/src/tools/binutils/../../external/gpl3/binutils/dist/bfd -I/u
>> sr/src/local/netbsd/src/tools/binutils/../../external/gpl3/binutils/dist/bfd/../
>> include     -W -Wall -Wstrict-prototypes -Wmissing-prototypes -Werror -O -c -o e
>> lf.lo /usr/src/local/netbsd/src/tools/binutils/../../external/gpl3/binutils/dist
>> /bfd/elf.c
>>
>> /usr/src/local/netbsd/src/tools/binutils/../../external/gpl3/binutils/dist/bfd/elf.c:4853:22: error: variable 'i_phdrp' set but not used [-Werror=unused-but-set-variable]
>>    Elf_Internal_Phdr *i_phdrp = 0; /* Program header table, internal form */
>>
>> I have tried things like
>>
>> NOGCCERROR=yes
>> NO_WERROR=-Wno-error
>> COPTS+=-w
>> CFLAGS+=-w
>> CXXFLAGS+=-w
>> CC=gcc -w
>> CXX=g++ -w
>>
>> in /etc/mk.conf, all to no avail.
>>
>> If I change things in src/external/gpl3/binutils, I would have to change
>> them after every cvs update -D'back-in-time'.
>>
>> Is there a way of getting past the "clean the environment" defences and
>> suppress warnings (given that this ends up with libtool)?
>
> After a suggestion from Christos
>
> diff --git a/tools/binutils/Makefile b/tools/binutils/Makefile
> index 45c6208..c7961d3 100644
> --- a/tools/binutils/Makefile
> +++ b/tools/binutils/Makefile
> @@ -5,7 +5,8 @@
>  MODULE=                binutils
>
>  CONFIGURE_ARGS=        --target=${MACHINE_GNU_PLATFORM} --disable-nls \
> -               --program-transform-name="s,^,${MACHINE_GNU_PLATFORM}-,"
> +               --program-transform-name="s,^,${MACHINE_GNU_PLATFORM}-," \
> +               --disable-werror
>
>  MAKE_ARGS=     MACHINE= MAKEINFO=${TOOL_MAKEINFO:Q}
>
>
> made it possible to build 5.99.5, so in a way "solved"

Maybe that could be made conditional on NOGCCERROR ?