https://llvm.org/bugs/show_bug.cgi?id=26729
Bug ID: 26729
Summary: lld: define special symbols _etext and _edata
Product: lld
Version: unspecified
Hardware: PC
OS: FreeBSD
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedb...@nondot.org
Reporter: ema...@freebsd.org
CC: llvm-bugs@lists.llvm.org
Blocks: 23214
Classification: Unclassified
In addition to _end, other linkers define _etext and _edata as the first
address after the text and data segment respectively. GNU GDB in the FreeBSD
base system relies on _etext and fails to build with lld.
Demonstration code:
% cat end_syms.c
#include <stdio.h>
#include <stdlib.h>
extern char etext, edata, end;
int
main(int argc, char *argv[])
{
printf("etext: %p\n", &etext);
printf("edata: %p\n", &edata);
printf("end: %p\n", &end);
}
% cc -fuse-ld=bfd end_syms.c
% ./a.out
etext: 0x4007e6
edata: 0x600aa4
end: 0x600ab8
% cc -fuse-ld=lld end_syms.c
udefined symbol: edata in /tmp/end_syms-2375e5.o
undefined symbol: etext in /tmp/end_syms-2375e5.o
cc: error: linker command failed with exit code 1 (use -v to see invocation)
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