Bug#980204: gdc: Resulting executables segfault on mipsel architecture (signal 11)

[Iain Buclaw <ibuclaw@gdcproject.org>]

Excerpts from Iain Buclaw's message of January 23, 2021 11:07 am:
> Excerpts from Iain Buclaw's message of January 23, 2021 2:36 am:
>> 
>> So the crux of the matter is that on MIPS, dynamic sections are read-only
>> (glibc sets DL_RO_DYN_SECTION 1), which requires special handling when pulling
>> data from dl_phdr_info.
>> 
>> Re-running with the attached patch applied.
>> 
>> Iain.
>> 
>> --- a/libphobos/libdruntime/gcc/sections/elf_shared.d
>> +++ b/libphobos/libdruntime/gcc/sections/elf_shared.d
>> @@ -22,6 +22,8 @@
>>  
>>  module gcc.sections.elf_shared;
>>  
>> +version (MIPS32)  version = MIPS_Any;
>> +version (MIPS64)  version = MIPS_Any;
>>  version (RISCV32) version = RISCV_Any;
>>  version (RISCV64) version = RISCV_Any;
>>  version (S390)    version = IBMZ_Any;
>> @@ -763,6 +765,8 @@ version (Shared)
>>                      // in glibc: #define DL_RO_DYN_SECTION 1
>>                      version (RISCV_Any)
>>                          strtab = cast(const(char)*)(info.dlpi_addr + dyn.d_un.d_ptr); // relocate
>> +                    else version (MIPS_Any)
>> +                        strtab = cast(const(char)*)(info.dlpi_addr + dyn.d_un.d_ptr); // relocate
>>                      else
>>                          strtab = cast(const(char)*)dyn.d_un.d_ptr;
>>                  }
>> 
>> 
> 
> It's halfway through now, and confirm that I see no more failures in the
> testsuite, so I'm fairly confident that everything should be OK now,
> though I'll try building your package later.
> 
> In case I don't get round to doing it myself this weekend, could a PR be
> raised in gcc bugzilla about it?  This so I can reference it in
> backports to gdc-10 and gdc-9.
> 

The logmake application runs just fine here.  Fix has been committed to
gcc mainline, and backported to the version 9 and 10 release branches.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98806

Regards
Iain.