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configure.ac: autodetect 'pause' instruction presence on sparc

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The change fixes the following build failure on sparc T3 and older CPUs:

```
sparc-unknown-linux-gnu-gcc ... -O2 -mcpu=niagara2 ... -c rwlock.c
{standard input}: Assembler messages:
{standard input}:398: Error: Architecture mismatch on "pause ".
{standard input}:398: (Requires v9e|v9v|v9m|m8; requested architecture is v9b.)
make[1]: *** [Makefile:280: rwlock.o] Error 1
```

`pause` insutruction exists only on `-mcpu=niagara4` (`T4`) and upper.

The change adds `pause` configure-time autodetection and uses it if available.
config.h.in got new `HAVE_SPARC_PAUSE` knob. Fallback is a fall-through no-op.

Build-tested on:

- sparc-unknown-linux-gnu-gcc (no `pause`, build succeeds)
- sparc-unknown-linux-gnu-gcc -mcpu=niagara4 (`pause`, build succeeds)

Reported-by: Rolf Eike Beer
Bug: https://bugs.gentoo.org/691708
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
This commit is contained in:
Sergei Trofimovich
2019-08-08 08:33:10 +01:00
committed by Ondřej Surý
parent d3506c9728
commit a5ad6b16c5
4 changed files with 51 additions and 1 deletions
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2
lib/isc/rwlock.c
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@@ -152,7 +152,7 @@ isc_rwlock_destroy(isc_rwlock_t *rwl) {
# define isc_rwlock_pause() __asm__ __volatile__ ("yield")
#elif defined(sun) && (defined(__sparc) || defined(__sparc__))
# define isc_rwlock_pause() smt_pause()
#elif defined(__sparc) || defined(__sparc__)
#elif (defined(__sparc) || defined(__sparc__)) && HAVE_SPARC_PAUSE
# define isc_rwlock_pause() __asm__ __volatile__ ("pause")
#elif defined(__ppc__) || defined(_ARCH_PPC) || \
defined(_ARCH_PWR) || defined(_ARCH_PWR2) || defined(_POWER)