https://bugs.llvm.org/show_bug.cgi?id=42813
Bug ID: 42813
Summary: Clang should give an error for .bss variables with
invalid initializer
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: john.br...@arm.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Currently if you compile a file containing this
int x __attribute__((section(".bss"))) = 1;
You get a fatal error in the backend
fatal error: error in backend: non-zero initializer found in section '.bss'
Or if the initializer is an address
int x = 1;
int *p __attribute__((section(".bss"))) = &x;
you get a slightly different error
fatal error: error in backend: cannot have fixups in virtual section!
We should be giving a proper error in the frontend, rather than failing with a
fatal error in the backend. gcc already does this, and gives the error
tmp.c:2:6: error: only zero initializers are allowed in section '.bss'
2 | int *p __attribute__((section(".bss"))) = &x;
| ^
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