Hello,
The code works with gcc-6.2.0, clang 3.9.0, pcc from 20161212, but
not with tcc (either ed99f3608df3d6dd4c8c7d52d608a8212203dfe4 or the
old version shipped with Ubuntu 16.10). I am working on x86-64 Linux
with recent 4.x kernels.
trouble.c:18: error: invalid clobber register '%rcx'
Is this a bug in tcc or does it just not support clobbers yet?
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#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#define __NR_write 1UL
void outputbuf(void);
void outputbuf(void) {
char OBUF[] = "I AM HAVING TROUBLE WITH CLOBBERS\n";
unsigned long int OUTPUT_WIDTH = (unsigned long int)strlen(OBUF);
signed long int ret;
asm volatile (
"syscall"
: "=a" (ret)
: "0"(__NR_write), "D"(STDOUT_FILENO), "S"(OBUF), "d"(OUTPUT_WIDTH)
: "cc", "%rcx", "%r11", "memory"
);
if (ret < 0L) abort();
return;
}
int main(void) {
outputbuf();
return EXIT_SUCCESS;
}
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