How to build current FASM on MacOS?

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TmX

Joined: 02 Mar 2006
Posts: 837
Location: Jakarta, Indonesia

TmX

I used fasm-1.73.27.tar.gz as starting point.

First, built objconv found at here
Then grab FASM.

Convert the object file:

Code:

./objconv -fmacho -nu fasm.o fasm.obj

Quote:

Input file: fasm.o, output file: fasm.obj
Converting from ELF32 to Mach-O Little Endian32
Adding leading underscores to symbol names

0 Debug sections removed
0 Exception sections removed
14 Changes in leading underscores on symbol names

Last part: link with gcc

Code:

gcc fasm.obj -o fasm

I got this:

Quote:

ld: warning: ignoring file fasm.obj, building for macOS-x86_64 but attempting to link with file built for unknown-i386
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

For those who are not familiar with MacOS:

Quote:

starting with macOS Catalina, 32-bit apps are no longer compatible with macOS

https://support.apple.com/en-us/HT208436

Any help?

21 Feb 2021, 13:39

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18646
Location: In your JS exploiting you and your system

revolution

You can make a 64-bit compatible binary here:
https://board.flatassembler.net/topic.php?t=19593

21 Feb 2021, 15:18

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8000
Location: Kraków, Poland

Tomasz Grysztar

If you start with fasmg (which comes with a 64-bit Mach-O executable in the official package), you might be able to use its Mach-O formatter and make fasm.x64 in Mach-O format instead of ELF (similarly to what jacobly did for fasmg).

21 Feb 2021, 16:10

TmX

Joined: 02 Mar 2006
Posts: 837
Location: Jakarta, Indonesia

TmX

Tomasz Grysztar wrote:

If you start with fasmg (which comes with a 64-bit Mach-O executable in the official package), you might be able to use its Mach-O formatter and make fasm.x64 in Mach-O format instead of ELF (similarly to what jacobly did for fasmg).

Sorry for very late reply. OK, just noticed there's fasmg for 64-bit MacOS
Next step, I assume, is to modify Linux fasm's code and then assemble it with fasmg?

06 Jan 2022, 05:44

ford

Joined: 21 Jan 2010
Posts: 118
Location: Absurdistan

ford

Tomasz Grysztar wrote:

If you start with fasmg (which comes with a 64-bit Mach-O executable in the official package), you might be able to use its Mach-O formatter and make fasm.x64 in Mach-O format instead of ELF (similarly to what jacobly did for fasmg).

Would there be any hope for FASM on M1 without Rosetta2?

_________________
Everything is absurd.

15 Mar 2022, 17:35

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