[Xen-changelog] [xen-unstable] [XEN] Define -fvisibility=hidden in CFLAGS to reduce -fpic cost

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 1d7c72e53d3de0cf66b3590a08d78000f4747c3e
# Parent  3e4fa8b5b245889a89a894faf6f5b8398a8f9907
[XEN] Define -fvisibility=hidden in CFLAGS to reduce -fpic cost
when compiling for x86/64.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 xen/arch/x86/Rules.mk |    3 +++
 1 files changed, 3 insertions(+)

diff -r 3e4fa8b5b245 -r 1d7c72e53d3d xen/arch/x86/Rules.mk
--- a/xen/arch/x86/Rules.mk     Tue Sep 12 11:43:22 2006 -0600
+++ b/xen/arch/x86/Rules.mk     Wed Sep 13 13:52:03 2006 +0100
@@ -42,6 +42,9 @@ ifeq ($(TARGET_SUBARCH),x86_64)
 ifeq ($(TARGET_SUBARCH),x86_64)
 CFLAGS  += -mno-red-zone -fpic -fno-reorder-blocks
 CFLAGS  += -fno-asynchronous-unwind-tables
+# -fvisibility=hidden reduces -fpic cost, if it's available
+CFLAGS  += $(shell $(CC) -v --help 2>&1 | grep " -fvisibility=" | \
+             grep -q hidden && echo "-fvisibility=hidden")
 LDFLAGS += -m elf_x86_64
 x86_32 := n
 x86_64 := y

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