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authorH.J. Lu <hjl.tools@gmail.com>2017-07-19 08:21:27 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-07-19 08:21:46 -0700
commit2b4fca86d786b4a5ed4f88c571eeec7d9ff5e684 (patch)
treed7881fd054c761a895934fd5a3ab8ff03262af56 /debug/Makefile
parent82e06600505cc26810d263a964d9eca6f3cdfe91 (diff)
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Don't add stack_chk_fail_local.o to libc.a [BZ #21740]
commit 524a8ef2ad76af8ac049293d993a1856b0d888fb Author: Nick Alcock <nick.alcock@oracle.com> Date: Mon Dec 26 10:08:57 2016 +0100 PLT avoidance for __stack_chk_fail [BZ #7065] Add a hidden __stack_chk_fail_local alias to libc.so, and make sure that on targets which use __stack_chk_fail, this does not introduce a local PLT reference into libc.so. which unconditionally added strong_alias (__stack_chk_fail, __stack_chk_fail_local) defines __stack_chk_fail_local as an alias of __stack_chk_fail in libc.a. There is no need to add stack_chk_fail_local.o to libc.a. We only need to add stack_chk_fail_local.oS to libc_nonshared.a. Tested on x86-64: [hjl@gnu-skl-1 build-x86_64-linux]$ nm libc.a | grep __stack_chk_fail 0000000000000000 T __stack_chk_fail 0000000000000000 T __stack_chk_fail_local [hjl@gnu-skl-1 build-x86_64-linux]$ nm libc_nonshared.a | grep __stack_chk_fail_local 0000000000000000 T __stack_chk_fail_local [hjl@gnu-skl-1 build-x86_64-linux]$ [BZ #21740] * debug/Makefile (elide-routines.o): New.
Diffstat (limited to 'debug/Makefile')
-rw-r--r--debug/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/debug/Makefile b/debug/Makefile
index ce5fa88..504bf87 100644
--- a/debug/Makefile
+++ b/debug/Makefile
@@ -53,6 +53,10 @@ routines = backtrace backtracesyms backtracesymsfd noophooks \
$(static-only-routines)
static-only-routines := warning-nop stack_chk_fail_local
+# Don't add stack_chk_fail_local.o to libc.a since __stack_chk_fail_local
+# is an alias of __stack_chk_fail in stack_chk_fail.o.
+elide-routines.o := stack_chk_fail_local
+
# Building the stack-protector failure routines with stack protection
# makes no sense.