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From: "harald at gigawatt dot nl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/100731] New: GCC 11 fails to build using GCC 4.8
 because of missing includes
Date: Sun, 23 May 2021 15:43:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100731

            Bug ID: 100731
           Summary: GCC 11 fails to build using GCC 4.8 because of missing
                    includes
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: harald at gigawatt dot nl
  Target Milestone: ---

When building GCC 11 with GCC 4.8 on a platform without _GLIBCXX_USE_C99, t=
he
build fails. The result is:

../../gcc-11.1.0/c++tools/server.cc: In function =E2=80=98void internal_err=
or(const
char*, ...)=E2=80=99:
../../gcc-11.1.0/c++tools/server.cc:199:10: error: =E2=80=98exit=E2=80=99 w=
as not declared in
this scope
   exit (2);
          ^
../../gcc-11.1.0/c++tools/server.cc: In function =E2=80=98void error(const =
char*,
...)=E2=80=99:
../../gcc-11.1.0/c++tools/server.cc:233:10: error: =E2=80=98exit=E2=80=99 w=
as not declared in
this scope
   exit (1);
          ^
../../gcc-11.1.0/c++tools/server.cc: In function =E2=80=98void print_usage(=
int)=E2=80=99:
../../gcc-11.1.0/c++tools/server.cc:284:15: error: =E2=80=98exit=E2=80=99 w=
as not declared in
this scope
   exit (status);
               ^
../../gcc-11.1.0/c++tools/server.cc: In function =E2=80=98void print_versio=
n()=E2=80=99:
../../gcc-11.1.0/c++tools/server.cc:299:10: error: =E2=80=98exit=E2=80=99 w=
as not declared in
this scope
   exit (0);
          ^
../../gcc-11.1.0/c++tools/server.cc: In function =E2=80=98int
maybe_parse_socket(std::string&, module_resolver*)=E2=80=99:
../../gcc-11.1.0/c++tools/server.cc:828:48: error: =E2=80=98strtoul=E2=80=
=99 was not declared
in this scope
    unsigned port =3D strtoul (cptr + 1, &endp, 10);
                                                ^
../../gcc-11.1.0/c++tools/server.cc: In function =E2=80=98void internal_err=
or(const
char*, ...)=E2=80=99:
../../gcc-11.1.0/c++tools/server.cc:200:1: warning: =E2=80=98noreturn=E2=80=
=99 function does
return [enabled by default]
 }
 ^
../../gcc-11.1.0/c++tools/server.cc: In function =E2=80=98void print_versio=
n()=E2=80=99:
../../gcc-11.1.0/c++tools/server.cc:300:1: warning: =E2=80=98noreturn=E2=80=
=99 function does
return [enabled by default]
 }
 ^
../../gcc-11.1.0/c++tools/server.cc: In function =E2=80=98void print_usage(=
int)=E2=80=99:
../../gcc-11.1.0/c++tools/server.cc:285:1: warning: =E2=80=98noreturn=E2=80=
=99 function does
return [enabled by default]
 }
 ^
../../gcc-11.1.0/c++tools/server.cc: In function =E2=80=98void error(const =
char*,
...)=E2=80=99:
../../gcc-11.1.0/c++tools/server.cc:234:1: warning: =E2=80=98noreturn=E2=80=
=99 function does
return [enabled by default]
 }
 ^

If the functions from <stdlib.h> are wanted, this file should just include
<stdlib.h> directly rather than relying on C++ headers pulling it in.

This happens for me on uclibc but is reproducible on glibc by locally modif=
ying
GCC 4.8's c++config.h to not define _GLIBCXX_USE_C99.=