can't build external gcc

Many projects (Buildroot, coreboot, Yocto) require building a toolchain.

Every time it tries to build it (I've checked Buildroot and coreboot) it fails with the following errors:

In file included from ./bconfig.h:3:0,

from ../../gcc/gengtype-lex.c:4:

./auto-host.h:2396:16: error: declaration does not declare anything [-fpermissive]

#define rlim_t long

^

In file included from /d/gcc-8.4.0/gcc-8.4.0/gcc/gengtype-lex.l:30:0:

../../gcc/system.h:488:14: error: conflicting declaration of C function ‘void* sbrk(int)’

extern void *sbrk (int);

In file included from /d/gcc-8.4.0/gcc-8.4.0/gcc/gengtype-lex.l:30:0:

../../gcc/system.h:496:14: error: ambiguating new declaration of ‘char* strstr(const char*, const char*)’

extern char *strstr (const char *, const char *);

In file included from /d/gcc-8.4.0/gcc-8.4.0/gcc/gengtype-lex.l:30:0:

../../gcc/system.h:540:20: error: conflicting declaration of C function ‘const char* strsignal(int)’

extern const char *strsignal (int);

In file included from ../../gcc/system.h:691:0,

from /d/gcc-8.4.0/gcc-8.4.0/gcc/gengtype-lex.l:30:

../../gcc/../include/libiberty.h:112:14: error: ambiguating new declaration of ‘char* basename(const char*)’

extern char *basename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1);

Switching gcc versions doesn't help.

One can find a simple way to reproduce in buildroot.txt, build-gcc.log provides a complete log.

Looking forward for your help. Thanks!

-- 

Best Regards,

Timofey Komarov

wget https://buildroot.org/downloads/buildroot-2020.02.1.tar.gz

tar -xf buildroot-2020.02.1.tar.gz

cd buildroot-2020.02.1

make menuconfig # save default

make

On Tue, 05 May 2020 04:35:31 +0300

Tim Komarov <happycorsair@yandex.ru> wrote:

What I'm trying to do (currently with devkitPro and EDK2) is to just

create a Guix package for the patched GCC toolchain and either use that

directly (devkitPro) or convince the build scripts to use the packaged

toolchain (EDK2).

I'm not sure if it will work out, but in the long run, it seems like

the better choice. That is, if it will work at all.