Commit a5ad6b16 authored by Sergei Trofimovich's avatar Sergei Trofimovich Committed by Ondřej Surý

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

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/691708Signed-off-by: 's avatarSergei Trofimovich <slyfox@gentoo.org>
parent d3506c97
......@@ -357,6 +357,9 @@
/* Define to 1 if you have the `setresuid' function. */
#undef HAVE_SETRESUID
/* define if the SPARC pause instruction is available */
#undef HAVE_SPARC_PAUSE
/* define if struct stat has st_mtim.tv_nsec field */
#undef HAVE_STAT_NSEC
......
......@@ -13872,6 +13872,39 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext ;; #(
;;
esac
#
# Check for pause support on SPARC processors
#
case $host in #(
sparc*) :
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for pause instruction support" >&5
$as_echo_n "checking for pause instruction support... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
__asm__ __volatile__ ("pause")
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
$as_echo "yes" >&6; }
$as_echo "#define HAVE_SPARC_PAUSE 1" >>confdefs.h
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
$as_echo "no" >&6; }
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext ;; #(
*) :
;;
esac
for ac_func in sysctlbyname
do :
ac_fn_c_check_func "$LINENO" "sysctlbyname" "ac_cv_func_sysctlbyname"
......
......@@ -415,6 +415,20 @@ AS_CASE([$host],
[define if the ARM yield instruction is available])],
[AC_MSG_RESULT([no])])])
#
# Check for pause support on SPARC processors
#
AS_CASE([$host],
[sparc*],
[AC_MSG_CHECKING([for pause instruction support])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]],
[[__asm__ __volatile__ ("pause")]])],
[AC_MSG_RESULT([yes])
AC_DEFINE([HAVE_SPARC_PAUSE], [1],
[define if the SPARC pause instruction is available])],
[AC_MSG_RESULT([no])])])
AC_CHECK_FUNCS([sysctlbyname])
#
......
......@@ -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)
......
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