https://llvm.org/bugs/show_bug.cgi?id=26030
Bug ID: 26030
Summary: On arm64 with mcmodel=large and fPIC clang produces
code with absolute relocations
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: phco...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Happens when dereferencing a string.
Sample code:
phcoder@sid:16:25:30:~/grub2$ cat clang-arm64.c
const char *tst(void) {
return "x";
}
Compilation:
phcoder@sid:16:23:46:~/grub2$ clang-3.8 -target aarch64-linux-gnu -fPIC -o 1.o
clang-arm64.c -c -mcmodel=large
clang version:
phcoder@sid:16:25:29:~/grub2$ clang-3.8 -v
Debian clang version 3.8.0-svn254193-1 (trunk) (based on LLVM 3.8.0)
Resultion object file:
1.o: file format elf64-littleaarch64
Disassembly of section .text:
0000000000000000 <tst>:
tst():
0: d2e00008 movz x8, #0x0, lsl #48
0: R_AARCH64_MOVW_UABS_G3 .rodata.str1.1
4: f2c00008 movk x8, #0x0, lsl #32
4: R_AARCH64_MOVW_UABS_G2_NC .rodata.str1.1
8: f2a00008 movk x8, #0x0, lsl #16
8: R_AARCH64_MOVW_UABS_G1_NC .rodata.str1.1
c: f2800008 movk x8, #0x0
c: R_AARCH64_MOVW_UABS_G0_NC .rodata.str1.1
10: aa0803e0 mov x0, x8
14: d65f03c0 ret
Expected results:
No absolute relocations
Actual results:
absolute relocations R_AARCH64_MOVW_UABS_G*
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