https://llvm.org/bugs/show_bug.cgi?id=31625
Bug ID: 31625
Summary: -fno-zero-initialized-in-bss -fno-common and tentative
definitions
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: hst...@ca.ibm.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Clang's support for -fno-zero-initialized-in-bss does not match GCC's.
In particular, when using -fno-common, tentative definitions are still placed
by GCC into BSS.
Online compiler:
http://melpon.org/wandbox/permlink/76ugV7cPaxxqjIMl
### Source (<stdin>):
int x;
### Compiler invocation:
clang -c -o a.o -x c -fno-common -fno-zero-initialized-in-bss -
### Additional commands:
objdump -wt a.o | grep -P '\b''x\b'
### Expected output:
0000000000000000 g O .bss 0000000000000004 x
### Actual output:
0000000000000000 g O .data 0000000000000004 x
### clang -v:
clang version 4.0.0 (trunk 290110)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/llvm-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
