I assumed a wget musl-libc-1.1.24.tar.gz wouldn't bother anyone, and it could have been a decent test-case for various reasons. Please keep in mind i had to fork kernel, libc, and a set of ~500 builds for TinyCC support, and it's final system-integration of a TinyCC driven OS release that i focus on, not individual implementation details, while i had to patch into hundreds of components already.
>
> I have no idea why arm-tcc would behave as you say because it doesn't.
Anyway, a matter of interpretation of the fact, seems this doesn't work either:
.text
.global START
.type START ,%function
START :
mov r11, #0
mov r14, #0
ldr r1, [1f]
add r1, r15, r1
mov r0, r13
2: and r12, r0, #-16
mov r13, r12
bl START_c
.weak _DYNAMIC
.hidden _DYNAMIC
.align 2
1: .word _DYNAMIC-2b
$ arm-tcc -c arch/arm/crt_arch.S
arch/arm/crt_arch.S:7: error: operand expected
Obviously some dynamic address calculation is necessary, and a thing like this
wouldn't do neither, syntactically at least:
ldr r1, [_DYNAMIC-2b]
arch/arm/crt_arch.S:7: error: local label '2' not found backward
nor:
ldr r1, [_DYNAMIC-2f]
arch/arm/crt_arch.S:7: error: invalid operation with label
I fear i'll have to leave that to anyone very much smarter with ARM mnemonics
than myself. And it's more __asm__() magic hiding inside musl-libc arch/arm,
which is a whole separate project to cope with, which i can't nor won't myself.
Question would be, if arm-tcc __asm__ support deserved and was relevant to any
future release tag made (besides other quirks related to aarch32 involved),
and if at all that was any priority for anyone. I merely considered it for
extended test coverage for TinyCC with a _final_ system integration of a
complete TinyCC driven OS release. And for aarch32 this probably doesn't deserve
any more noise of mine on the mailing-list anyway. If anyone else was capable
to address the issue i am willing to re-iterate over ~500builds linking against
musl-libc with arm-tcc then, if and how much would pass compile-time/run-time.
Otherhwise, sorry.
--
Michael Ackermann
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