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authorH.J. Lu <hjl.tools@gmail.com>2017-10-04 17:18:23 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-10-04 17:18:42 -0700
commitee417882e07277b2a36e7e61e6ef7edd96415b3f (patch)
treebdd0f60f81b8a631c63275ea083308ad4127f404 /config.h.in
parenta67029ff12319300458a502be1d12aa2065c48da (diff)
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Don't use hidden visibility in libc.a with PIE on i386
On i386, when multi-arch is enabled, all external functions must be
called via PIC PLT in PIE, which requires setting up EBX register,
since they may be IFUNC functions.

	* config.h.in (NO_HIDDEN_EXTERN_FUNC_IN_PIE): New.
	* include/libc-symbols.h (__hidden_proto_hiddenattr): Add check
	for PIC and NO_HIDDEN_EXTERN_FUNC_IN_PIE.
	* sysdeps/i386/configure.ac (NO_HIDDEN_EXTERN_FUNC_IN_PIE): New
	AC_DEFINE if multi-arch is enabled.
	* sysdeps/i386/configure: Regenerated.
Diffstat (limited to 'config.h.in')
-rw-r--r--config.h.in4
1 files changed, 4 insertions, 0 deletions
diff --git a/config.h.in b/config.h.in
index 0d38476fa4..c140ff3ecb 100644
--- a/config.h.in
+++ b/config.h.in
@@ -86,6 +86,10 @@
 #undef	PI_STATIC_AND_HIDDEN
 
 /* Define this to disable the 'hidden_proto' et al macros in
+   include/libc-symbols.h that avoid PLT slots in PIE.  */
+#undef  NO_HIDDEN_EXTERN_FUNC_IN_PIE
+
+/* Define this to disable the 'hidden_proto' et al macros in
    include/libc-symbols.h that avoid PLT slots in the shared objects.  */
 #undef	NO_HIDDEN