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authorH.J. Lu <hjl.tools@gmail.com>2017-08-21 05:47:10 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-08-21 05:47:27 -0700
commit7c41b4a1315fc4415e468bbac94f77ecdb74f4c8 (patch)
tree87604a3ee6aa519b03f852d549e5b2706358f305 /include/libc-symbols.h
parent483d70687919ab42c3c6498a99e51b210e5f45ca (diff)
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Enable hidden visibility in libc.a compiled with PIE
When building libc.a with PIE, enable hidden visibility to allow direct access to definitions within libc.a without using GOT. Size comparison of elf/ldconfig when the compiler defaults to -fPIE: On x86-64: text data bss dec hex Before: 619206 20132 5488 644826 9d6da After : 619062 20132 5488 644682 9d64a On i686: text data bss dec hex Before: 556305 10816 3056 570177 8b341 After : 553688 10756 3056 567500 8a8cc * include/libc-symbols.h (attribute_hidden): Enable hidden visibility in libc.a compiled with PIE.
Diffstat (limited to 'include/libc-symbols.h')
-rw-r--r--include/libc-symbols.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/libc-symbols.h b/include/libc-symbols.h
index fe3ab81..d6a1c26 100644
--- a/include/libc-symbols.h
+++ b/include/libc-symbols.h
@@ -363,7 +363,8 @@ for linking")
strong_alias(real, name)
#endif
-#if defined SHARED || defined LIBC_NONSHARED
+#if defined SHARED || defined LIBC_NONSHARED \
+ || (BUILD_PIE_DEFAULT && IS_IN (libc))
# define attribute_hidden __attribute__ ((visibility ("hidden")))
#else
# define attribute_hidden