illumos gate

In addition to testing that gcc's profiling now works as expected, I also tested what happens if the hook returns a non-zero value.

To do this, I used this fragment with various return codes (0, 1 and 55):

int
__start_crt_compiler (int argc, char **argv)
{
        return 1;
}

Then included this in the link and checked that the behaviour was as expected for both 32- and 64-bit objects:

# No hook
% ld /usr/lib/64/crt1.o /usr/lib/64/crti.o test.o -lc /usr/lib/64/crtn.o
% ./a.out
Test

# Hook returns 0
% ld crt1-64.o hook0.o /usr/lib/64/crti.o test.o -lc /usr/lib/64/crtn.o
% ./a.out
Test

# Hook returns 1
% ld crt1-64.o hook1.o /usr/lib/64/crti.o test.o -lc /usr/lib/64/crtn.o
% ./a.out
% echo $?
1

# Hook returns 55
% ld crt1-64.o hook55.o /usr/lib/64/crti.o test.o -lc /usr/lib/64/crtn.o
% ./a.out
% echo $?
55

and for 32-bit:

% ld crt1-32.o /usr/lib/crti.o test.o -lc /usr/lib/crtn.o
% ./a.out
Test

% ld crt1-32.o hook0.o /usr/lib/crti.o test.o -lc /usr/lib/crtn.o
% file a.out
a.out:          ELF 32-bit LSB executable 80386 Version 1, dynamically linked, not stripped, no debugging information available
% ./a.out
Test

% ld crt1-32.o hook1.o /usr/lib/crti.o test.o -lc /usr/lib/crtn.o
% ./a.out
% echo $?
1
% ld crt1-32.o hook55.o /usr/lib/crti.o test.o -lc /usr/lib/crtn.o
% ./a.out
% echo $?
55