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Re: [Patch Darwin] fix missing __USER_LABEL_PREFIX__ on extended identifiers.



On 15 Feb 2012, at 17:16, Mike Stump wrote:


On Feb 15, 2012, at 2:21 AM, Iain Sandoe wrote:
I noticed when working on GAS for darwin that we fail to prepend the user label prefix for extended identifiers.

Does this match the native compiler on the platform? This is abi changing, and we can't do it, unless it mismatches the native compiler?


extended identifiers are not recognized by the system gcc-4.0

for gcc-4.2.1:

$ echo " int \u00c0; " | gcc-4.2 -std=c99 -fextended-identifiers -x c - -S -o t.s
$ cat t.s
.section __TEXT,__text,regular,pure_instructions
.section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32
.machine ppc7400
.comm "_À",4,2
.subsections_via_symbols


-------^ .. this is what prompted me to make the fix.

So, this just brings us into line with the current system compiler.

AFAICT: clang does not yet support them.

As for whether it's useful/compatible with earlier tool-chains - apparently usable for Darwin 9 [there can't be any instances in system components there, since the system compiler is 4.0].

so - apply or not?
Iain


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