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Enable hidden visibility in libc.a compiled with PIE

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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.
This commit is contained in:
H.J. Lu 2017-08-21 05:47:10 -07:00
parent 483d706879
commit 7c41b4a131
2 changed files with 7 additions and 1 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2017-08-21 H.J. Lu <hongjiu.lu@intel.com>
* include/libc-symbols.h (attribute_hidden): Enable hidden
visibility in libc.a compiled with PIE.
2017-08-21 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822]

3
include/libc-symbols.h
View File

@ -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