Only builds with clang, fails to build with gcc

[xyproto]

When building with clang, it works:

$ CC=clang make
clang -O2 -std=gnu99 -Wall -Werror -Wmissing-prototypes -I/home/afr/clones/vmir -DVMIR_USE_TLSF -I/home/afr/clones/vmir/tlsf -g src/main.c src/vmir.c tlsf/tlsf.c  -lm -o vmir

But with gcc, I get errors:

cc -O2 -std=gnu99 -Wall -Werror -Wmissing-prototypes -I/home/afr/clones/vmir -DVMIR_USE_TLSF -I/home/afr/clones/vmir/tlsf -g src/main.c src/vmir.c tlsf/tlsf.c  -lm -o vmir
In file included from src/vmir.c:595:
src/vmir_vm.c: In function ‘vm_exec’:
src/vmir_vm.c:1635:7: error: ‘strncat’ accessing between 1 and 4294967295 bytes at offsets [0, 4294967295] and [0, 4294967295] may overlap 1 byte at offset [0, 8589934590] [-Werror=restrict]
       strncat(HOSTADDR(R32(1)), HOSTADDR(R32(2)), R32(3));
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/vmir_vm.c:1628:7: error: ‘strncpy’ accessing between 0 and 4294967295 bytes at offsets [0, 4294967295] and [0, 4294967295] may overlap up to 4294967295 bytes at offset 4294967294 [-Werror=restrict]
       strncpy(HOSTADDR(R32(1)), HOSTADDR(R32(2)), R32(3));
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/vmir_vm.c:1621:7: error: ‘strcat’ accessing 1 or more bytes at offsets [0, 4294967295] and [0, 4294967295] may overlap 1 byte at offset [0, 9223372036854775807] [-Werror=restrict]
       strcat(HOSTADDR(R32(1)), HOSTADDR(R32(2)));
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/vmir_vm.c:1614:7: error: ‘strcpy’ accessing 1 byte at offsets [0, 4294967295] and [0, 4294967295] may overlap 1 byte at offset 0 [-Werror=restrict]
       strcpy(HOSTADDR(R32(1)), HOSTADDR(R32(2)));
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [Makefile:29: vmir] Error 1

GCC version:

$ cc --version
cc (GCC) 8.1.1 20180531
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang version:

$ clang --version
clang version 6.0.1 (tags/RELEASE_601/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

This is on 64-bit Arch Linux.

[morimolymoly]

Could you try to add -Wno-error=restrict CFLAGS in Makefile?