gcc7 vs gcc10

tests.txt

smartos-build-2(~/gcc10-shadow)[0]% cat /tmp/simple.c 
#include <stdio.h>

main()
{
	printf("Hello, world.\n");
}
smartos-build-2(~/gcc10-shadow)[0]% gcc --version
gcc (GCC) 7.3.0
Copyright (C) 2017 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.

smartos-build-2(~/gcc10-shadow)[0]% proto.strap/usr/gcc/7/bin/gcc --version    
gcc (GCC) 7.5.0
Copyright (C) 2017 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.

smartos-build-2(~/gcc10-shadow)[0]% proto.strap/usr/gcc/10/bin/gcc --version
gcc (GCC) 10.3.0
Copyright (C) 2020 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.

smartos-build-2(~/gcc10-shadow)[0]% gcc -o /tmp/simple /tmp/simple.c
/tmp/simple.c:3:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main()
 ^~~~
smartos-build-2(~/gcc10-shadow)[0]% echo "__xpg4/X" | mdb /tmp/simple
mdb: failed to dereference symbol: unknown symbol name
smartos-build-2(~/gcc10-shadow)[0]% proto.strap/usr/gcc/7/bin/gcc -o /tmp/simple /tmp/simple.c
/tmp/simple.c:3:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main()
 ^~~~
smartos-build-2(~/gcc10-shadow)[0]% echo "__xpg4/X" | mdb /tmp/simple
mdb: failed to dereference symbol: unknown symbol name
smartos-build-2(~/gcc10-shadow)[0]% proto.strap/usr/gcc/10/bin/gcc -o /tmp/simple /tmp/simple.c
/tmp/simple.c:3:1: warning: return type defaults to 'int' [-Wimplicit-int]
    3 | main()
      | ^~~~
smartos-build-2(~/gcc10-shadow)[0]% echo "__xpg4/X" | mdb /tmp/simple
simple`__xpg4:
simple`__xpg4:  1               
smartos-build-2(~/gcc10-shadow)[0]% 




AND ON OMNIOS TOO!


# uname -a
SunOS bloody 5.11 omnios-master-1b78ae4a16 i86pc i386 i86pc
# gcc --version
gcc (OmniOS 151041/10.3.0-il-1) 10.3.0
Copyright (C) 2020 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.

# gcc -o /tmp/simple /tmp/simple.c
/tmp/simple.c:3:1: warning: return type defaults to 'int' [-Wimplicit-int]
    3 | main()
      | ^~~~
# echo "__xpg4/X" | mdb /tmp/simple
simple`__xpg4:
simple`__xpg4:  1               
#