https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67220
Bug ID: 67220
Summary: GCC fails to properly handle libcall symbol visibility
of built functions
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
[hjl@gnu-6 builtins-2]$ cat x.c
typedef __SIZE_TYPE__ size_t;
extern void *memset(void *s, int c, size_t n)
__attribute__ ((visibility ("hidden")));
void
foo1 (void *s, size_t n)
{
memset (s, '\0', n);
}
void
foo2 (void *s, int c, size_t n)
{
memset (s, c, n);
}
[hjl@gnu-6 builtins-2]$ make
/export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -O2 -fPIC -S -o x.s x.c
[hjl@gnu-6 builtins-2]$ cat x.s
.file "x.c"
.section .text.unlikely,"ax",@progbits
.LCOLDB0:
.text
.LHOTB0:
.p2align 4,,15
.globl foo1
.type foo1, @function
foo1:
.LFB0:
.cfi_startproc
movq %rsi, %rdx
xorl %esi, %esi
jmp memset@PLT <<<<<<<<<<<<<< It shouldn't use PLT.
.cfi_endproc
.LFE0:
.size foo1, .-foo1
.section .text.unlikely
.LCOLDE0:
.text
.LHOTE0:
.section .text.unlikely
.LCOLDB1:
.text
.LHOTB1:
.p2align 4,,15
.globl foo2
.type foo2, @function
foo2:
.LFB1:
.cfi_startproc
jmp memset
.cfi_endproc
.LFE1:
.size foo2, .-foo2
.section .text.unlikely
.LCOLDE1:
.text
.LHOTE1:
.hidden memset
.ident "GCC: (GNU) 6.0.0 20150812 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-6 builtins-2]$
