- Change the example CFLAGS entry to match our default in sys.mk.

- Document that -fno-strict-aliasing is required for -O2.

Prodded by:	users of stable@

1 files changed, 7 insertions, 3 deletions

diff --git a/share/examples/etc/make.conf b/share/examples/etc/make.conf
index bdb5670..8d47d7e 100644
--- a/share/examples/etc/make.conf
+++ b/share/examples/etc/make.conf
@@ -48,10 +48,14 @@
 # CFLAGS controls the compiler settings used when compiling C code.
 # Note that optimization settings other than -O and -O2 are not recommended
 # or supported for compiling the world or the kernel - please revert any
-# nonstandard optimization settings to "-O" or -O2 before submitting bug
-# reports without patches to the developers.
+# nonstandard optimization settings to "-O" or "-O2 -fno-strict-aliasing"
+# before submitting bug reports without patches to the developers.
 #
-#CFLAGS= -O -pipe
+# Compiling with -fstrict-aliasing optimization breaks some [notable] ports.
+# GCC turns on -fstrict-aliasing optimization at all levels above -O[1], so
+# explicitly turn it off when using compiling with the -O2 optimization level.
+#
+#CFLAGS= -O2 -fno-strict-aliasing -pipe
 #
 # CXXFLAGS controls the compiler settings used when compiling C++ code.
 # Note that CXXFLAGS is initially set to the value of CFLAGS.  If you wish