https://bugs.llvm.org/show_bug.cgi?id=43627
Bug ID: 43627
Summary: LTO + LLD fails with "SHF_MERGE section size must be a
multiple of sh_entsize"
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: samitolva...@google.com
CC: htmldevelo...@gmail.com, jgalen...@google.com,
llvm-bugs@lists.llvm.org, ndesaulni...@google.com,
r...@google.com
When compiling the Linux kernel with ThinLTO+LLD, we ran into an issue that can
be reproduced as follows:
$ cat test.c
#include <stdio.h>
#define SIZE_AB 2
#define SIZE_C 3
#define __initconst __attribute__((__section__(".init.rodata")))
static const unsigned int __initconst a[][SIZE_AB] = {
{ 0, 0 },
{ 0, 0 },
};
static const unsigned int __initconst b[][SIZE_AB] = {
{ 0, 0 },
{ 0, 0 },
};
static const unsigned int __initconst c[][SIZE_C] = {
{ 0, 0, 0 },
{ 0, 0, 0 },
};
int main() {
for (int i = 0; i < 2; i++) {
printf("%u\n", a[i][0]);
printf("%u\n", b[i][0]);
printf("%u\n", c[i][0]);
}
return 0;
}
$ clang -flto=thin -fvisibility=default -c -o test.o test.c
$ ld.lld -r -o all.o test.o
ld.lld: error: lto.tmp: SHF_MERGE section size must be a multiple of sh_entsize
Here, the section size is 56 bytes, while sh_entsize is 16 bytes.
In the kernel, we don't have this issue with full LTO, but the reproducer above
fails to compile also with -flto. Here's the ClangBuiltLinux bug:
https://github.com/ClangBuiltLinux/linux/issues/510
This issue is reproducible with a ToT LLVM.
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