Broken libcc1 lookup in GDB/Ubuntu

[Luis Machado]

On 3/24/21 1:45 PM, Ruslan Kabatsayev wrote:
> Hi,
> 
> On Wed, 24 Mar 2021 at 18:15, Luis Machado via Gdb <gdb@sourceware.org> wrote:
>>
>> Hi,
>>
>> While looking at enabling the compile tests in GDB's testsuite, I
>> noticed GDB doesn't find the right shared library because it is looking
>> for a different naming pattern.
>>
>> In the case of Ubuntu 18.04/20.04, the shared library is named like so:
>>
>> /usr/lib/aarch64-linux-gnu/libcc1.so.0.0.0
>> /usr/lib/aarch64-linux-gnu/libcc1.so.0 -> libcc1.so.0.0.0
> 
> "apt-file search libcc1.so" shows me that e.g. gcc-9 package (and
> other versions of gcc) provides the suffixless version. It's installed
> as a symlink into /usr/lib/gcc/aarch64-linux-gnu/9/libcc1.so . Can it
> not be found?
> 

Those do exist, but GDB seems to want to load that library from 
/usr/lib/aarch64-linux-gnu, and not from, say, 
/usr/lib/aarch64-linux-gnu/9/libcc1.so.

There is no symlink from /usr/lib/aarch64-linux-gnu/libcc1.so.0 pointing 
at the version-specific file.

>>
>> But GDB is looking for libcc1.so in the following ways:
>>
>> #define GCC_C_FE_LIBCC libcc1.so
>> #define GCC_CP_FE_LIBCC libcc1.so
>>
>> So, basically, the gdb.compile tests will never be exercised
>> out-of-the-box, even if you install the libcc1 package. I had to add a
>> symlink named "libcc1.so" to make GDB happy.
>>
>> Now, I noticed there was a proposed fix for this many years ago, in the
>> following series:
>>
>> https://gcc.gnu.org/legacy-ml/gcc-patches/2015-04/msg01241.html
>> https://gcc.gnu.org/legacy-ml/gcc-patches/2015-04/msg01242.html
>> https://gcc.gnu.org/legacy-ml/gcc-patches/2015-04/msg01243.html
>> https://gcc.gnu.org/legacy-ml/gcc-patches/2015-04/msg01244.html
>> https://gcc.gnu.org/legacy-ml/gcc-patches/2015-04/msg01245.html
>>
>> Was this dropped for some reason? Or is this still valid and should be
>> pursued upstream?
>>
>>
>> Thanks,
>> Luis
> 
> Regards,
> Ruslan
>