Re: Build fails due a warning in lib

[Kai Ruottu <kai.ruottu@wippies.com>]

Vincenzo Palazzo via Gcc-help kirjoitti 5.10.2023 klo 22.27:
> Hi list,
>
> I am trying to build gcc with the following command
> ../../gittea/gcc/configure -v
> --prefix=/home/vincenzopalazzo/build-dir/gcc
> --enable-languages=c,c++,rust --disable-multilib
>
> and when I ran `make` I got the error reported below. I have the feeling
> that I am missing something, because this code is not touched since
> 2012 (thank git blame)
> so I am pretty sure that I am missing something, but not sure what.
>
> P.S: the gcc version that I use to compile gcc is 12.3.0
>
> tti -I../../../../gittea/gcc/libcpp -I.
> -I../../../../gittea/gcc/libcpp/../include
> -I../../../../gittea/gcc/libcpp/include    -c -o expr.o -MT expr.o
> -MMD -MP -MF .deps/expr.Tpo ../../../../gittea/gcc/libcpp/expr.cc
> ../../../../gittea/gcc/libcpp/expr.cc: In function ‘unsigned int
> cpp_classify_number(cpp_reader*, const cpp_token*, const char**,
> location_t)’:
> ../../../../gittea/gcc/libcpp/expr.cc:842:35: error: format not a
> string literal and no format arguments [-Werror=format-security]
>    842 |             cpp_warning_with_line (pfile, CPP_W_LONG_LONG,
> virtual_location,
>        |
> ~~~~~
> cc1plus: some warnings being treated as errors
You are missing to tell what is the C++ compiler you are using to 
compile the
'libcpp' stuff. Please don't expect a C++ compiler from 2012 or earlier to
"grok" some uptodate C++ code.  For the gcc-12.3.0 sources I myself would
try gcc-7.5.0 or newer as the stage-1 compiler in the native-GCC case.