Re: gdb fails to build

[Tobias Burnus <tobias.burnus@physik.fu-berlin.de>]

On Fri, Nov 27, 2015 at 02:05:53PM -0500, Simon Marchi wrote:
> I just tested building gdb (622b9eb1a6047bd3ad3e1a3f120cf7318ac25b57) using gcc master:
> /opt/gcc/bin/gcc -v
> gcc version 6.0.0 20151127 (experimental) (GCC)
> and it works fine.  Have you done a build from scratch or an incremental one?
>
> In gdb/build-gnulib/config.log, I have:
> 
>  965 configure:16981: checking for max_align_t
>  966 configure:16981: result: yes
> 
> I suppose that yours says "no".

I think I found the issue of mine: I accidentally start a new
shell in my build script:
  time (make "$@" && make install)
which overrides the set PATH - such that ./configure runs with
/usr/bin/gcc while make runs with gcc 6.

Thus, I had "result: no" but before your patch, it didn't fail.

Sorry for the false alarm!

 * * *

Still, using GCC 6 through out still fails - albeit due to an other issue:

make[4]: Entering directory `/data/local_users/tobiasb/gdb/binutils-gdb/build/gold'
g++ -DHAVE_CONFIG_H -I. -I../../gold  -I../../gold -I../../gold/../include -I../../gold/../elfcpp -DLOCALEDIR="\"/data/local_users/tobiasb/gdb/gdb-inst/share/locale\"" -DBINDIR="\"/data/local_users/tobiasb/gdb/gdb-inst/bin\"" -DTOOLBINDIR="\"/data/local_users/tobiasb/gdb/gdb-inst/x86_64-pc-linux-gnu/bin\"" -DTOOLLIBDIR="\"/data/local_users/tobiasb/gdb/gdb-inst/x86_64-pc-linux-gnu/lib\""   -W -Wall    -Werror -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -frandom-seed=dirsearch.o -I../../gold/../zlib -g -O2 -MT dirsearch.o -MD -MP -MF .deps/dirsearch.Tpo -c -o dirsearch.o ../../gold/dirsearch.cc
../../gold/dirsearch.cc:125:1: error: ‘{anonymous}::Dir_caches::~Dir_caches()’ defined but not used [-Werror=unused-function]
 Dir_caches::~Dir_caches()
 ^~~~~~~~~~

That's with GDB 622b9eb1a6047bd3ad3e1a3f120cf7318ac25b57
and GCC 335ce86cb6cea8046993ab93d573316fd9ff798c (r231023).

I wonder why that didn't show up with before
when configuring with GCC 4.4 and building GCC 6.

I assume it didn't show up for you as you didn't use
'--enable-ld --enable-gold' - or did you also build gold?

Cheers,

Tobias