[Buildroot] [git commit] eglibc: add comment explaining why we pass -O2

[Thomas Petazzoni]

commit: http://git.buildroot.net/buildroot/commit/?id=f443c8317bfadfdfdfe38a1731dcfbdba3a6d0ae
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master

While reviewing the eglibc package, Peter mentionned that it would be
good to add a comment that explains why we explicitly build eglibc
with -O2 instead of using the user selected optimization level. This
commit add such a comment.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 package/eglibc/eglibc.mk |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/package/eglibc/eglibc.mk b/package/eglibc/eglibc.mk
index 253dabd..8873a06 100644
--- a/package/eglibc/eglibc.mk
+++ b/package/eglibc/eglibc.mk
@@ -36,6 +36,9 @@ endif
 #
 #  2. We have to execute the configure script with bash and not sh.
 #
+# Note that as mentionned in
+# http://patches.openembedded.org/patch/38849/, eglibc must be built
+# with -O2, so we pass our own CFLAGS and CXXFLAGS below.
 define EGLIBC_CONFIGURE_CMDS
 	mkdir -p $(@D)/build
 	# Do the configuration