[llvm-bugs] [Bug 35720] New: Link failure with -z notext (it changes behaviour, not just allows DT_TEXTREL)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35720

            Bug ID: 35720
           Summary: Link failure with -z notext (it changes behaviour, not
                    just allows DT_TEXTREL)
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: emaste at freebsd.org
                CC: llvm-bugs at lists.llvm.org

-z notext should allow relocations in a read-only (i.e., the .text) segment,
but lld changes behaviour when -z notext is specified and linking a trivial
application on FreeBSD fails:

% cc -Wl,-z,notext hello.c
/usr/bin/ld: error: relocation R_X86_64_PC32 cannot be used against shared
object; recompile with -fPIC
>>> defined in /lib/libc.so.7
>>> referenced by crt1.c:63 (/usr/home/emaste/src/freebsd/lib/csu/amd64/crt1.c:63)
>>>               /usr/lib/crt1.o:(_start)
cc: error: linker command failed with exit code 1 (use -v to see invocation)

I do not have a reduced test case, but can attach a reproducer for the hello
world link if desired. However, I observe that RelExpr() bypasses the special
case for Sym.isFunc() if !Config->ZText. There's a comment in RelExpr() that
describes this same issue occurring with glibc.

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