build: disable unsafe optimizations

Compile at -O2 and disable optimizations that trigger gcc bugs.

Some people still reported mksnapshot crashes after commit b40f813 ("build: fix
spurious mksnapshot crashes for good" - so much for that).

Average performance of the -O2 binary is on par with the -O3 binary. Variance
on the http_simple bytes/8 benchmark appears to be slightly greater but small
enough that the possibly of it being noise cannot be excluded.

The new binary very slightly but consistently outperforms the -O3 binary (by
about 0.5%) on the mostly CPU-bound bytes/102400 benchmark. That could be an
artifact of the system I benchmarked it on, a Core 2 Duo with a puny 32 kB of
L1 instruction cache. The smaller binary seems to play nicer with the cache.

1 files changed, 0 insertions, 1 deletions

diff --git a/configure b/configure
index b7d8498abd..6ce54b8b65 100755
--- a/configure
+++ b/configure
@@ -297,7 +297,6 @@ def configure_node(o):
   # SunOS, and we haven't implemented it.)
   if sys.platform.startswith('sunos'):
     o['variables']['node_use_dtrace'] = b(not options.without_dtrace)
-    o['variables']['v8_no_strict_aliasing'] = 1 # work around compiler bug
   elif b(options.with_dtrace) == 'true':
     raise Exception('DTrace is currently only supported on SunOS systems.')
   else: