https://bugs.llvm.org/show_bug.cgi?id=41169
Bug ID: 41169
Summary: Symbol assignments within output sections are not
relative to enclosing section
Product: lld
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: pkmx...@gmail.com
CC: llvm-bugs@lists.llvm.org, peter.sm...@linaro.org
To reproduce:
$ cat > test.ld <<EOF
SECTIONS {
.foo 0x10000 : {
. = 4;
foo = .;
}
}
EOF
$ clang -xc - -o empty.o < /dev/null
$ ld.lld empty.o -Ttest.ld
ld.lld: error: test.ld:3: unable to move location counter backward for: .foo
ld.lld: error: section .foo at 0x10000 of size 0xFFFFFFFFFFFF0004 exceeds
available address space
It works with ld.bfd:
$ ld.bfd empty.o -Ttest.ld
$ readelf -s a.out | grep foo
4: 0000000000010004 0 NOTYPE GLOBAL DEFAULT 1 foo
---------------------------------
ld.bfd treats numbers in an output section as relative to the beginning of the
section
(https://sourceware.org/binutils/docs/ld/Expression-Section.html#Expression-Section),
so the assignment `. = 4` actually moves dot to 0x10004.
In lld, `. = 4` tries to move dot backwards to absolute address 4, which is not
allowed within an output section.
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