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Mark internal stdlib functions with attribute_hidden [BZ #18822]

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Mark internal stdlib functions with attribute_hidden to allow direct
access within libc.so and libc.a without using GOT nor PLT.  __realpath
is hidden with libc_hidden_proto and libc_hidden_def since the exported
realpath is an alias of __realpath.

	[BZ #18822]
	* include/stdlib.h (__random): Add attribute_hidden.
	(__random_r): Likewise.
	(__srandom_r): Likewise.
	(__initstate_r): Likewise.
	(__setstate_r): Likewise.
	(__erand48_r): Likewise.
	(__nrand48_r): Likewise.
	(__jrand48_r): Likewise.
	(__srand48_r): Likewise.
	(__seed48_r): Likewise.
	(__lcong48_r): Likewise.
	(__drand48_iterate): Likewise.
	(__setenv): Likewise.
	(__unsetenv): Likewise.
	(__clearenv): Likewise.
	(__ptsname_r): Likewise.
	(__posix_openpt): Likewise.
	(__add_to_environ): Likewise.
	(__realpath): Add libc_hidden_proto.
	(__ecvt_r): Likewise.
	(__fcvt_r): Likewise.
	(__qecvt_r): Likewise.
	(__qfcvt_r): Likewise.
	* misc/efgcvt_r.c (cvt_symbol_1): Add libc_hidden_def (local).
	* stdlib/canonicalize.c (__realpath): Add libc_hidden_def.
This commit is contained in:
H.J. Lu
2017-10-01 14:34:18 -07:00
parent ef9b6f73f4
commit 8ed3b64330
4 changed files with 68 additions and 20 deletions
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7
misc/efgcvt_r.c
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@ -240,6 +240,7 @@ __APPEND (FUNC_PREFIX, ecvt_r) (FLOAT_TYPE value, int ndigit, int *decpt,
cvt_symbol_1 (libc, __APPEND (FUNC_PREFIX, symbol), \
APPEND (FUNC_PREFIX, symbol), GLIBC_2_4)
# define cvt_symbol_1(lib, local, symbol, version) \
libc_hidden_def (local) \
versioned_symbol (lib, local, symbol, version)
# else
# define cvt_symbol(symbol) \
@ -247,11 +248,15 @@ __APPEND (FUNC_PREFIX, ecvt_r) (FLOAT_TYPE value, int ndigit, int *decpt,
APPEND (q, symbol), GLIBC_2_0); \
weak_alias (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
# define cvt_symbol_1(lib, local, symbol, version) \
libc_hidden_def (local) \
compat_symbol (lib, local, symbol, version)
# endif
#else
# define cvt_symbol(symbol) \
weak_alias (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
cvt_symbol_1 (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
# define cvt_symbol_1(local, symbol) \
libc_hidden_def (local) \
weak_alias (local, symbol)
#endif
cvt_symbol(fcvt_r);
cvt_symbol(ecvt_r);