> I don't think this does what you expect it to do. At least looking at
> the 8cc makefile, the compiler is hardcoded as `cc', not the expansion
> of the variable `cc'.
You are right.
But the CC flag is accepted.
Try "make CC=clang" and it will work.
But "make CC=../1c/8cc" fails. Any idea how to use relative paths like that?
> On my system, the resulting binaries include references to the path they were compiled at.
That could be the reason then.
Let's try to test on the same absolute paths.
On Tue, Jul 5, 2016 at 3:55 PM, S. Gilles <sgilles_AT_math.umd.edu> wrote:
> On 2016-07-05T15:31:57-0300, Marc Collin wrote:
>> I did some tests with 8cc (because it's easier to build than scc for me).
>> My results are that the binaries aren't identical.
>> Here's a script so you can try to reproduce it.
>>
>> #!/bin/sh
>> mkdir test_comp
>> cd test_comp
>> git clone https://github.com/rui314/8cc
>> mv 8cc 1c
>> cp -r 1c 2c
>> cp -r 1c Ac
>> cp -r 1c Bc
>>
>> # compile 8cc with gcc
>> cd 1c
>> make cc=gcc
>>
>> # compile 8cc with clang
>> cd ../2c
>> make cc=clang
>
> I don't think this does what you expect it to do. At least looking at
> the 8cc makefile, the compiler is hardcoded as `cc', not the expansion
> of the variable `cc'. Try
>
> make cc=/bin/false
>
> or such.
>
>> # compile 8cc with 8cc
>> # using the binary that
>> # was compiled with gcc
>> cd ../Ac
>> make cc=../1c/8cc
>>
>> # compile 8cc with 8cc
>> # using the binary that
>> # was compiled with clang
>> cd ../Bc
>> make cc=../2c/8cc
>>
>> cd ..
>>
>> # compare binaries
>> md5sum Ac/8cc Bc/8cc
>>
>
> On my system, the resulting binaries include references to the path they
> were compiled at.
>
> $ ls */8cc
> 8cc/8cc other_8cc/8cc
> $ strings 8cc/8cc | grep home
> /home/sgilles/temp/a/8cc/include
> #include </home/sgilles/temp/a/8cc/include/8cc.h>
> /home/sgilles/temp/a/8cc
> $ strings other_8cc/8cc | grep home
> /home/sgilles/temp/a/other_8cc/include
> #include </home/sgilles/temp/a/other_8cc/include/8cc.h>
> /home/sgilles/temp/a/other_8cc
>
> I suspect this is what actually causes the differences in md5sums.
>
> --
> S. Gilles
>
Received on Tue Jul 05 2016 - 21:00:11 CEST