Build fails due a warning in lib

Build fails due a warning in lib

[Vincenzo Palazzo]

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

Cheers,

Vincent.

----

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,
      |
~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  843 |                                    0, message);
      |                                    ~~~~~~~~~~~
../../../../gittea/gcc/libcpp/expr.cc:845:38: error: format not a
string literal and no format arguments [-Werror=format-security]
  845 |             cpp_pedwarning_with_line (pfile, CPP_W_LONG_LONG,
      |             ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
  846 |                                       virtual_location, 0, message);
      |                                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../../gittea/gcc/libcpp/expr.cc:855:33: error: format not a
string literal and no format arguments [-Werror=format-security]
  855 |           cpp_warning_with_line (pfile, CPP_W_SIZE_T_LITERALS,
      |           ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  856 |                                  virtual_location, 0, message);
      |                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../../gittea/gcc/libcpp/expr.cc:867:42: error: format not a
string literal and no format arguments [-Werror=format-security]
  867 |                 cpp_pedwarning_with_line (pfile, CPP_W_C11_C2X_COMPAT,
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  868 |                                           virtual_location, 0, message);
      |                                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../../gittea/gcc/libcpp/expr.cc:870:39: error: format not a
string literal and no format arguments [-Werror=format-security]
  870 |                 cpp_warning_with_line (pfile, CPP_W_C11_C2X_COMPAT,
      |                 ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  871 |                                        virtual_location, 0, message);
      |                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../../../gittea/gcc/libcpp/expr.cc:877:35: error: format not a
string literal and no format arguments [-Werror=format-security]
  877 |               cpp_error_with_line (pfile, CPP_DL_PEDWARN,
virtual_location, 0,
      |
~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  878 |                                    message);
      |                                    ~~~~~~~~
cc1plus: some warnings being treated as errors

Re: Build fails due a warning in lib

[Kai Ruottu]

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.

Re: Build fails due a warning in lib

[Kai Ruottu]

Kai Ruottu kirjoitti 6.10.2023 klo 13.24:
> 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
>> 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.
Maybe I misunderstood your writing.... Using gcc-12.3.0 to compile some
old GCC sources would also be questionable. Using some older g++ then
would succeed.

Re: Build fails due a warning in lib

[Vincenzo Palazzo]

Hi all,

FYI I found the solution, the problem was my nix shell that was
adding additional build flags.

This was a known problem around the nix community, see [1]

[1] https://stackoverflow.com/questions/77249760/gcc-build-fails-due-a-warning-in-libcpp/77250223#77250223

Cheers,

Vincent.