[llvm-bugs] [Bug 44594] New: clang++ cannot compile an executable with -fPIE because of possibly incorrect linking of

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44594

            Bug ID: 44594
           Summary: clang++ cannot compile an executable with -fPIE
                    because of possibly incorrect linking of
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kolan_n at mail.ru
                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

```
clang++-10 ./hw.cpp -o hw -fPIE -Wl,-pie -Wl,-O1 -Wl,--sort-common
-Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,-z,shstk -Wl,-z,notext
-Wl,--verbose
GNU ld (GNU Binutils for Ubuntu) 2.33
...
/usr/bin/ld: mode elf_x86_64
....
attempt to open /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o succeeded
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o
.....
/usr/bin/ld: /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o: relocation
R_X86_64_32 against hidden symbol `__TMC_END__' can not be used when making a
PIE object
/usr/bin/ld: final link failed: nonrepresentable section on output
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```

```
clang++-10 ./hw.cpp -o hw -fPIE -Wl,-pie -Wl,-O1 -Wl,--sort-common
-Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,-z,shstk -Wl,-z,notext -fuse-ld=lld
-Wl,--verbose
...
ld.lld: /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o
....
ld.lld: error: cannot preempt symbol: __TMC_END__
>>> defined in /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtend.o
>>> referenced by crtstuff.c
>>>               /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o:(.text+0x1)

ld.lld: error: relocation R_X86_64_32S cannot be used against local symbol;
recompile with -fPIC
>>> defined in /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o
>>> referenced by crtstuff.c
>>>               /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o:(.text+0x7)

ld.lld: error: relocation R_X86_64_32 cannot be used against local symbol;
recompile with -fPIC
>>> defined in /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o
>>> referenced by crtstuff.c
>>>               /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o:(.text+0x18)

ld.lld: error: cannot preempt symbol: __TMC_END__
>>> defined in /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtend.o
>>> referenced by crtstuff.c
>>>               /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o:(.text+0x31)

ld.lld: error: relocation R_X86_64_32S cannot be used against local symbol;
recompile with -fPIC
>>> defined in /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o
>>> referenced by crtstuff.c
>>>               /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o:(.text+0x38)

ld.lld: error: relocation R_X86_64_32 cannot be used against local symbol;
recompile with -fPIC
>>> defined in /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o
>>> referenced by crtstuff.c
>>>               /usr/bin/../lib/gcc/x86_64-linux-gnu/9/crtbegin.o:(.text+0x5A)
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```

```
g++-9 ./hw.cpp -o hw -fPIE -Wl,-pic -Wl,-O1 -Wl,--sort-common -Wl,--as-needed
-Wl,-flto -Wl,-z,relro -Wl,-z,now -Wl,-z,ibtplt -Wl,-z,ibt -Wl,-z,shstk
-Wl,--verbose
GNU ld (GNU Binutils for Ubuntu) 2.33
....
/usr/bin/ld: mode elf_x86_64
....
attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/crtbeginS.o succeeded
/usr/lib/gcc/x86_64-linux-gnu/9/crtbeginS.o
```
compiles and links OK

https://dev.gentoo.org/~vapier/crt.txt says:

>crtbegin.o
>  GCC uses this to find the start of the constructors.
>crtbeginS.o
>  Used in place of crtbegin.o when generating shared objects/PIEs.
>crtend.o
>  GCC uses this to find the start of the destructors.
>crtendS.o
>  Used in place of crtend.o when generating shared objects/PIEs.

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