DevOps, CI/CD and Automation

Hello.

In my quest to get a project compiled which depends on boost (amongst others), I tried to compile boost 1.49. After small modifications, the compile went peacefully but sunCC chokes on some assembler which is unfortunately required for parts that the project depends on.

Here is a small testcase. The atomic_add32() is taken straight from boost. What is interesting though is that if no -xO flag is set, sunCC compiles without any warnings/errors but seems to ignore the assembler because it produces the wrong output (5 instead of 30). As soon as a -xO[0-5] is set, the following error is produced: "test.cpp", [main]:ube: error: Invalid reference to argument '0' in GASM Inlining

Again, I am using a x86_64 Linux (Gentoo) with Studio 12.3 and gcc 4.6.2 (if that matters). Naturally, gcc/icc/path64 all compile is code just fine and produce the right result.

-----
#include <stdint.h>
#include <iostream>

inline uint32_t atomic_add32(volatile uint32_t *mem, uint32_t val)
{
int r;

asm volatile
(
"lock\n\t"
"xadd %1, %0":
"+m"( *mem ), "=r"( r ): // outputs (%0, %1)
"1"( val ): // inputs (%2 == %1)
"memory", "cc" // clobbers
);

return r;
}

int main(void)
{
uint32_t test = 5;

atomic_add32(&test, 25);

std::cout << test << std::endl;

return 0;
}
-----

Thanks for any help in advance.

So long,
matthias