[llvm-bugs] [Bug 47348] New: [x86 asm] Assertion failed: (Type == RT32_32), function getRelocType32, file llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp, line 260.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47348

            Bug ID: 47348
           Summary: [x86 asm] Assertion failed: (Type == RT32_32),
                    function getRelocType32, file
                    llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cp
                    p, line 260.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Building the FreeBSD port graphics/vulkan-loader [1] results in an assertion:

Assertion failed: (Type == RT32_32), function getRelocType32, file
/usr/src/contrib/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp,
line 260.
PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the
crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: clang -cc1as -triple i386-unknown-freebsd13.0
-filetype obj -main-file-name unknown_ext_chain_gas.s -target-cpu i686
-mrelocation-model static unknown_ext_chain_gas.s

This is caused by a @GOT relocation in the .s file [2]; minimized test case:

# clang -cc1as -triple i386-- -filetype obj unknown_ext_chain_gas-min.s
.intel_syntax noprefix
push offset termin_error_string at GOT

I could not find any version of clang that was able to compile this without
asserting! GNU as has no problems, obviously:

% as -v unknown_ext_chain_gas-min.s -o unknown_ext_chain_gas-min.o
GNU assembler version 2.33.1 (i386-portbld-freebsd13.0) using BFD version (GNU
Binutils) 2.33.1

% objdump -d -r unknown_ext_chain_gas-min.o

unknown_ext_chain_gas-min.o:     file format elf32-i386-freebsd


Disassembly of section .text:

00000000 <.text>:
   0:   68 00 00 00 00          push   $0x0
                        1: R_386_GOT32  termin_error_string

[1] https://github.com/KhronosGroup/Vulkan-Loader
[2]
https://github.com/KhronosGroup/Vulkan-Loader/blob/master/loader/unknown_ext_chain_gas.S#L103

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