[Qemu-devel] qemu-0.8.2 on glibc 2.2.5: CLOCK_MONOTONIC not defined

[Wolfgang Schildbach]

I stumbled upon the same problem as Bill Rossi (see his post below):

The current cvs version of qemu fails to compile on my machine because 
CLOCK_MONOTONIC is not defined in my glibc. According to clock_gettime(3), 
systems that define this functionality have _POSIX_MONOTONIC_CLOCK and 
_POSIX_TIMERS set. Updating the ifdef (see patch below) to include these 
makes the offending code go away on my CLOCK_MONOTONIC-less system 
(gcc3.3), but continues to include it on a newer system with a later 
libgcc. Not sure if the __linux__ in there is still necessary, but I left 
it in for good measure.

Please consider for inclusing into CVS.

Thx,
- Wolfgang Schildbach

Index: vl.c
===================================================================
RCS file: /sources/qemu/qemu/vl.c,v
retrieving revision 1.217
diff -r1.217 vl.c
550c550
< #if defined(__linux__)
---
> #if defined (__linux__) && defined(_POSIX_TIMERS) && 
defined(_POSIX_MONOTONIC_CLOCK)
562c562
< #if defined(__linux__)
---
> #if defined (__linux__) && defined(_POSIX_TIMERS) && 
defined(_POSIX_MONOTONIC_CLOCK)


Bill Rossi wrote on 26.07.2006 19:38:08:

> 
> Fails to compile on Linux with glibc 2.2.5.  CLOCK_MONOTONIC isn't
> defined in glibc 2.2.5.  The following patch is a workaround:
> 
> --- qemu-0.8.2/vl.c     2006-07-22 13:23:34.000000000 -0400
> +++ ../qemu-0.8.2/vl.c  2006-07-26 11:37:34.000000000 -0400
> @@ -541,7 +541,7 @@
>  static void init_get_clock(void)
>  {
>      use_rt_clock = 0;
> -#if defined(__linux__)
> +#if 0 //defined(__linux__)
>      {
>          struct timespec ts;
>          if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
> @@ -553,7 +553,7 @@
> 
>  static int64_t get_clock(void)
>  {
> -#if defined(__linux__)
> +#if 0 //defined(__linux__)
>      if (use_rt_clock) {
>          struct timespec ts;
>          clock_gettime(CLOCK_MONOTONIC, &ts);
> 
> 
> 
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--
Wolfgang Schildbach
Group Manager Systems Engineering and Consulting
Coding Technologies GmbH