Hi, GNU Assembler and the clang assembler support more complex macros natively (using the .macro and.endm directives), without the need for the C preprocessor. This completely sidesteps the need for explicit ";" as the GAS macros respect newlines inside the macro.
See https://godbolt.org/z/6zzqoeKE4 for a very simple example. Of course, you can also pass arguments, see https://sourceware.org/binutils/docs/as/Macro.html for the full documentation. Best regards, Pedro On Wed, Jan 5, 2022 at 8:36 PM Andrew Fish via groups.io <afish= [email protected]> wrote: > I was playing around with getting Xcode to compile AArch64 code and I hit > an interesting compatibility issue. The assembler line continuation token > for GCC (;) is a comment for the Xcode clang assembler. For Xcode clang you > need to use %%. Yikes [1] > > I was wondering if any one else has hit this in another project and if > there was any cool workaround? > > The only thing I can think of is the “big hammer” on both (well you only > need one) ends. We could replace ; with a #define that matches the > assembler. It looks like this issue mostly hits in Code that is using C > pre-processor macros so we could refactor the code. I’m a little concerned > that the C pre processor is getting used since the macro languages of the > assembler might also have some compatibility issues? > > Looking for ideas and opinions on the best way to fix this if we want to > add Xcode as an ARM compiler in the future. > > > [1] > https://github.com/tianocore/edk2/blob/master/MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.S#L13 > > #define GPR_LAYOUT \ > REG_PAIR (x19, x20, 0); \ > REG_PAIR (x21, x22, 16); \ > REG_PAIR (x23, x24, 32); \ > REG_PAIR (x25, x26, 48); \ > REG_PAIR (x27, x28, 64); \ > REG_PAIR (x29, x30, 80);/*FP, LR*/ \ > REG_ONE (x16, 96) /*IP0*/ > I had to change it to: > > #define GPR_LAYOUT \ > REG_PAIR (x19, x20, 0)%% \ > REG_PAIR (x21, x22, 16)%% \ > REG_PAIR (x23, x24, 32)%% \ > REG_PAIR (x25, x26, 48)%% \ > REG_PAIR (x27, x28, 64)%% \ > REG_PAIR (x29, x30, 80)%%/*FP, LR*/ \ > REG_ONE (x16, 96) /*IP0*/ > > Thanks, > > Andrew Fish > > > > -- Pedro Falcato -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#85293): https://edk2.groups.io/g/devel/message/85293 Mute This Topic: https://groups.io/mt/88223192/21656 Group Owner: [email protected] Unsubscribe: https://edk2.groups.io/g/devel/unsub [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
