GCC 4.7 vs ARM assembly

In a recent bout of ‘They Changed It, Now It Sucks’, GCC 4.7 won't add interworking instructions to ARM assembly code unless you add a .type directive to the function boilerplate. Following some code from devkitARM 38 announcement:

    @ section directive goes here.
    @ code dirctive goes here.
    .align  2
    .global foo
    .type   foo STT_FUNC                @ Add this line right here
    @ etc

Though the change is simple, it does effectively mean that basically all older assembly code is now b0rked, including tonc and many of the ASM functions I've written about here. I hope I can assess the damage this weekend and fix everything.

UPDATE 2012-05-20

Had some time to work on this. When I first saw that I was going to have to do this, I though ‘Oh naw, I'm going to have to update every single ASM function I have?’ But then I noticed that I had already done so, more or less. One of the things I realized some time after the 1.4 release was that copy-pasting the standard boiler-plate code for ASM functions was stupid, so I created macros to do that instead. I was pleasantly surprised to see that I had already upgraded all tonclib functions with that macro, so all I had to do was add the single line in a single place and recompile. Fuck yeah, macros.

The only troublesome thing was that the inline ASM I used in swi_demo failed horrifically, so I just removed those.


The current status is that all the code's okay again, but the text parts still need to be updated.

One thought on “GCC 4.7 vs ARM assembly

  1. I wish you the best of luck, and that the code doesn't miss treat you too much =P.
    And there is always time.

Leave a Reply

Your email address will not be published. Required fields are marked *