[llvm-bugs] [Bug 46332] New: fatal error: error in backend: 'main' label emitted multiple times to assembly file

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46332

            Bug ID: 46332
           Summary: fatal error: error in backend: 'main' label emitted
                    multiple times to assembly file
           Product: clang
           Version: 7.0
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rspoerri at yuhsbstudents.org
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

I was doing some evil things in C, and I wrote the following code:

asm("main:");
int main() {
  return 0;
}

I compiled it:

$ clang-7 -pthread -lm -o main main.c
fatal error: error in backend: 'main' label emitted multiple
      times to assembly file
clang-7: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 7.0.0 (git at github.com:apple/swift-clang.git
5c9d04dc0697297a47b5edb0c1a581b306a42bdb) (git at github.com:apple/swift-llvm.git
34250a6eef79ee8a83c5cfb4deb1583176dcbb63)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
clang-7: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.llvm.org/ and include the crash backtrace, preprocessed source,
and associated run script.
clang-7: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-7: note: diagnostic msg: /tmp/main-e9d39a.c
clang-7: note: diagnostic msg: /tmp/main-e9d39a.sh
clang-7: note: diagnostic msg: 

********************
compiler exit status 70

However, when I did:

asm("x:x:");
int main() {
  return 0;
}

I got a normal, external error:

$ clang-7 -pthread -lm -o main main.c
<inline asm>:1:3: error: invalid symbol redefinition
x:x:
  ^
1 error generated.
compiler exit status 1

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20200615/7204b811/attachment.html>