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Add hidden visibility to internal function prototypes

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Add hidden visibility to internal function prototypes to allow direct
access to internal functions within libc.a without using GOT when the
compiler defaults to -fPIE.

Size comparison of elf/ldconfig when the compiler defaults to -fPIE:

On x86-64:
        text	   data	    bss	    dec	    hex
Before: 619646	  20132	   5488	 645266	  9d892
After : 619502	  20132	   5488	 645122	  9d802
On i686:
        text	   data	    bss	    dec	    hex
Before: 550333	  10748	   3060	 564141	  89bad
After : 546453	  10732	   3060	 560245	  88c75

	* include/libc-symbols.h (__hidden_proto_hiddenattr): New for
	building libc.a.
	(hidden_proto): Likewise.
	(hidden_tls_proto): Likewise.
	(__hidden_proto): Likewise.
This commit is contained in:
H.J. Lu 2017-08-21 05:50:38 -07:00
parent 7c41b4a131
commit 568ff4296c
2 changed files with 22 additions and 2 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2017-08-21 H.J. Lu <hongjiu.lu@intel.com>
* include/libc-symbols.h (__hidden_proto_hiddenattr): New for
building libc.a.
(hidden_proto): Likewise.
(hidden_tls_proto): Likewise.
(__hidden_proto): Likewise.
2017-08-21 H.J. Lu <hongjiu.lu@intel.com>
* include/libc-symbols.h (attribute_hidden): Enable hidden

16
include/libc-symbols.h
View File

@ -513,8 +513,20 @@ for linking")
# endif
#else
# ifndef __ASSEMBLER__
# define hidden_proto(name, attrs...)
# define hidden_tls_proto(name, attrs...)
# if !defined SHARED && IS_IN (libc) && !defined LIBC_NONSHARED \
&& !defined NO_HIDDEN
# define __hidden_proto_hiddenattr(attrs...) \
__attribute__ ((visibility ("hidden"), ##attrs))
# define hidden_proto(name, attrs...) \
__hidden_proto (name, , name, ##attrs)
# define hidden_tls_proto(name, attrs...) \
__hidden_proto (name, __thread, name, ##attrs)
# define __hidden_proto(name, thread, internal, attrs...) \
extern thread __typeof (name) name __hidden_proto_hiddenattr (attrs);
# else
# define hidden_proto(name, attrs...)
# define hidden_tls_proto(name, attrs...)
# endif
# else
# define HIDDEN_JUMPTARGET(name) JUMPTARGET(name)
# endif /* Not __ASSEMBLER__ */