https://llvm.org/bugs/show_bug.cgi?id=25528
Bug ID: 25528
Summary: lld -Bstatic fails to link because _end is undefined
Product: lld
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedb...@nondot.org
Reporter: dav...@freebsd.org
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The first bug found while building world on FreeBSD =)
sbrk() access _end (directly!) to understand where .bss ends.
The linker should probably insert that in the generated executable (at least
when -Bstatic is used). It seems gold doesn't strip the symbol even if not
referenced.
% ./clang sbrk.c -fuse-ld=lld2 -o sbrs -static
undefined symbol: _end in sbrk.o
clang-3.8: error: linker command failed with exit code 1 (use -v to see
invocation)
Linker invocation:
"/exps/llvm-lld/build/bin/./ld.lld2" -Bstatic -o sbrs /usr/lib/crt1.o
/usr/lib/crti.o /usr/lib/crtbeginT.o -L/usr/lib /tmp/sbrk-63b6db.o -lgcc
-lgcc_eh -lc -lgcc -lgcc_eh /usr/lib/crtend.o /usr/lib/crtn.o
% cat sbrk.c
#include <sys/types.h>
#include <unistd.h>
int
main(void)
{
void *me = sbrk(42);
return (0);
}
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