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

Sergei Trofimovich requested to merge (removed):sparc-pause into master

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

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