Paul Pluzhnikov <[EMAIL PROTECTED]> writes:
> I forgot exactly how glibc achieves that, but I know that in newer
> versions of glibc, fopen() calls mmap() directly (instead of
> calling through PLT):
The glibc avoids PIC overhead by using
__attribute__((visibility("hidden"))):
$ cat junk.c
int foo() ATTR;
int bar() { return foo(); }
$ gcc -c -DATTR -fPIC junk.c && objdump -dr junk.o
...
d: 81 c3 03 00 00 00 add $0x3,%ebx
f: R_386_GOTPC _GLOBAL_OFFSET_TABLE_
13: e8 fc ff ff ff call 14 <bar+0x14>
14: R_386_PLT32 foo
...
$ gcc -DATTR='__attribute__((visibility ("hidden")))' -c -fPIC junk.c &&
objdump -dr junk.o
...
6: e8 fc ff ff ff call 7 <bar+0x7>
7: R_386_PC32 foo
...
Cheers,
--
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