[llvm-bugs] [Bug 30435] New: [Rust][DebugInfo] SHF_MERGE section size must be a multiple of sh_entsize

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30435

            Bug ID: 30435
           Summary: [Rust][DebugInfo] SHF_MERGE section size must be a
                    multiple of sh_entsize
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: japaricious at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Trying to link a hello world program written in Rust with debuginfo enabled
yields the following error message:

```
hello.o: SHF_MERGE section size must be a multiple of sh_entsize
```

Omitting the debuginfo results in bug 30434
(https://llvm.org/bugs/show_bug.cgi?id=30434)

Linking with `ld` instead of `lld` works fine.

### Steps To Reproduce

As a bash script but I've also attached the .cpio file generated by these
commands below:

.cpio file: https://www.dropbox.com/s/nikwo5s8fms22du/debuginfo.cpio?dl=0

``` bash
main() {
    # install_rust

    # test program
    echo 'fn main() { println!("Hello, world!"); }' > hello.rs

    # compile only, we'll link manually
    rm -f hello.o
    # NOTE omit the `-g` to omit debuginfo
    rustc -g --emit=obj hello.rs

    # store the path to the sysroot in a variable to make the following
commands shorter
    local sysroot=$(rustc --print sysroot)

    # link 
    # NOTE The arguments used here are what `rustc` (and `cc`) would ultimately
pass to `ld` when
    # directly building an executable via the `rustc hello.rs` command. You can
see what flags
    # `rustc` passes to `cc` with the `rustc -Z print-link-args hello.rs`
command.
    # NOTE(2) You will have to update the library search paths and paths to
startup objects
    ld.lld \
        --build-id \
        --eh-frame-hdr \
        --hash-style=gnu \
        -m \
        elf_x86_64 \
        -dynamic-linker \
        /lib64/ld-linux-x86-64.so.2 \
        -pie \
        -o \
        hello \
        /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib/Scrt1.o \
        /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib/crti.o \
        /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/crtbeginS.o \
        -L$sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib \
        -L$sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib \
        -L/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1 \
        -L/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib \
        -L/lib/../lib \
        -L/usr/lib/../lib \
        -L/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../.. \
        --as-needed \
        -z \
        noexecstack \
        hello.o \
        --gc-sections \
        -Bstatic \
        -Bdynamic \
        $sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-411f48d3.rlib
\
       
$sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-411f48d3.rlib
\
       
$sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-411f48d3.rlib \
        $sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/librand-411f48d3.rlib
\
       
$sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcollections-411f48d3.rlib
\
       
$sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_unicode-411f48d3.rlib
\
       
$sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-411f48d3.rlib \
       
$sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc_jemalloc-411f48d3.rlib
\
        $sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-411f48d3.rlib
\
        $sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-411f48d3.rlib
\
       
$sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-411f48d3.rlib
\
        -ldl \
        -lpthread \
        -lgcc_s \
        -lpthread \
        -lc \
        -lm \
        -lrt \
        -lutil \
        /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/crtendS.o \
        /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.1/../../../../lib/crtn.o \
        --reproduce debuginfo

    uninstall_rust
}

install_rust() {
    curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain
nightly-2016-09-15 --no-modify-path -y
    source ~/.cargo/env
}

uninstall_rust() {
    rustup self uninstall
}

main
```

### Meta

```
$ ld.lld --version
LLD 4.0 (git://github.com/llvm-mirror/lld.git
a499b2da2436789a9136f046f193caad0801ed93)
```

```
$ rustc -Vv
rustc 1.13.0-nightly (6ffdda1ba 2016-09-14)
binary: rustc
commit-hash: 6ffdda1ba183c981d57e63b59c88184be449eee4
commit-date: 2016-09-14
host: x86_64-unknown-linux-gnu
release: 1.13.0-nightly
```

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