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authorNick Alcock <nick.alcock@oracle.com>2016-12-26 10:08:18 +0100
committerFlorian Weimer <fweimer@redhat.com>2016-12-26 10:08:19 +0100
commit03baef1c9cfb396d76cae20a00aee657871e79c4 (patch)
treeed115b828293aa26c4b5f338391286b25eaa955e /config.h.in
parent81e0662e5f2c342ffa413826b7b100d56677b613 (diff)
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Configure support for --enable-stack-protector [BZ #7065]
This adds =all and =strong, with obvious semantics, defaulting to off.

We don't validate the value of the option yet: that's in a later patch.
Nor do we use it for anything at this stage.

We differentiate between 'the compiler understands -fstack-protector'
and 'the user wanted -fstack-protector' so that we can pass
-fno-stack-protector in appropriate places even if the user didn't want
to turn on -fstack-protector for other parts.  (This helps us overcome
another existing limitation, that glibc doesn't work with GCCs hacked
to pass in -fstack-protector by default.)

We also arrange to set the STACK_PROTECTOR_LEVEL #define to a value
appropriate for the stack-protection level in use for each file in
particular.
Diffstat (limited to 'config.h.in')
-rw-r--r--config.h.in6
1 files changed, 6 insertions, 0 deletions
diff --git a/config.h.in b/config.h.in
index 33757bd553..d96ce0f8cf 100644
--- a/config.h.in
+++ b/config.h.in
@@ -48,6 +48,12 @@
 /* Define if compiler accepts -ftree-loop-distribute-patterns.  */
 #undef  HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
 
+/* The level of stack protection in use for glibc as a whole.
+   May be overridden on a file-by-file basis.  */
+#ifndef STACK_PROTECTOR_LEVEL
+#undef	STACK_PROTECTOR_LEVEL
+#endif
+
 /* Define if the regparm attribute shall be used for local functions
    (gcc on ix86 only).  */
 #undef	USE_REGPARMS