[llvm-bugs] [Bug 35828] New: lld ignores /usr/lib/rcrt1.o crt file

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35828

            Bug ID: 35828
           Summary: lld ignores /usr/lib/rcrt1.o crt file
           Product: lld
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: bjornpagen at gmail.com
                CC: llvm-bugs at lists.llvm.org

In musl-1.1.10 and foward, musl provides rcrt1 in addition to crt{1,i,n}. This
new crt start file, rcrt1.o, is provided for producing static-linked position
independent executables (PIE). [1] 

rcrt1.o is a dependency of musl, and musl will not compile unless it is able to
access the __dls2 function that is defined in it.

GNU linkers such as bfd and gold have added support for including this file,
and musl compiles with no issue. But when I tried to use lld as a drop in
replacement, the build fails, and the lld throws this error:

/usr/bin/x86_64-gentoo-linux-musl-ld: error: undefined symbol: __dls2
>>> referenced by ld-temp.o
>>>               lto.tmp:(_dlstart_c)
clang-5.0: error: linker command failed with exit code 1 (use -v to see
invocation)


A couple grep -R's in lld's source code didn't reveal anything concerning
rcrt1, so I am assuming it has not been implemented yet.

lld version is 5.0.1

[1] https://www.musl-libc.org/oldversions.html

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