[llvm-bugs] [Bug 32425] New: Regression with Musl after adding support for outputting to /dev/null

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32425

            Bug ID: 32425
           Summary: Regression with Musl after adding support for
                    outputting to /dev/null
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dima at golovin.in
                CC: llvm-bugs at lists.llvm.org

Created attachment 18172
  --> https://bugs.llvm.org/attachment.cgi?id=18172&action=edit
revert regressive commit

I believe that the regression was introduced with revision 291485 "Support
outputting to /dev/null."

I really don't know why is this the case, but it is proven to work. The patch
doesn't seem to affect anything with compilation process, but it does.


Symptoms:

LLVM builds fine, musl builds fine, linking with musl always fails with this
error message:

    ld.lld: error: ../crt/crt1.c:(function _start_c): cannot preempt symbol
'__libc_start_main' defined in /path/to/sysroot/bin/../lib/libc.so
    ld.lld: error: hello.c:(function main): cannot preempt symbol 'printf'
defined in /path/to/sysroot/bin/../lib/libc.so
    clang-5.0: error: linker command failed with exit code 1 (use -v to see
invocation)


Steps to reproduce:

1. Build llvm with clang, lld and compiler-rt.
2. Build musl with resulting compiler.
3. Build a "Hello, World!" program and try to link it with musl.

It fails with anything newer than revision 291485. It will not fail if attached
patch is applied (but /dev/null as an output will also be unsupported).

-- 
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/20170325/61e00ff3/attachment.html>