Need to mark sccache 0.7.4 as broken

[robertmaynard]

Solution to issue cannot be found in the documentation.

• I checked the documentation.

Issue

The 0.7.4 release of sccache has a serious regression in hash computation, which causes multiple unique compile lines to hash to the same value ( mozilla/sccache#2038 )

> cat verify.cpp
#ifdef GEN_ERROR
# error "expected error"
#endif
> g++ -o build/verify.o -c verify.cpp
> g++ -DGEN_ERROR -o build/verify.o -c verify.cpp

verify.cpp:4:3: error: #error "expected error"

> sccache g++ -o build/verify.o -c verify.cpp 
> sccache g++ -DGEN_ERROR -o build/verify.o -c verify.cpp # no error



### Installed packages

```shell
sccache = 0.7.4

Environment info

active environment : None
            shell level : 0
       user config file : /home/rmaynard/.condarc
 populated config files : /home/rmaynard/.condarc
          conda version : 23.9.0
    conda-build version : 3.27.0
         python version : 3.11.4.final.0
       virtual packages : __archspec=1=x86_64
                          __cuda=12.0=0
                          __glibc=2.31=0
                          __linux=5.4.0=0
                          __unix=0=0
       base environment : /home/rmaynard/miniconda3  (writable)
      conda av data dir : /home/rmaynard/miniconda3/etc/conda
  conda av metadata url : None
           channel URLs : https://conda.anaconda.org/conda-forge/linux-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/linux-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/linux-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /home/rmaynard/miniconda3/pkgs
                          /home/rmaynard/.conda/pkgs
       envs directories : /home/rmaynard/miniconda3/envs
                          /home/rmaynard/.conda/envs
               platform : linux-64
             user-agent : conda/23.9.0 requests/2.31.0 CPython/3.11.4 Linux/5.4.0-169-generic ubuntu/20.04.6 glibc/2.31 solver/libmamba conda-libmamba-solver/23.7.0 libmambapy/1.4.1
                UID:GID : 1000:1000
             netrc file : None
           offline mode : False

[jakirkham]

Looks like this is fixed with PR ( mozilla/sccache#2039 ) in 0.7.6+. Is that right?

[bdice]

Yes. There are no releases of 0.7.5 on conda-forge, so I think only these packages are affected:

https://anaconda.org/conda-forge/sccache/files?version=0.7.4

win-64/sccache-0.7.4-hdbe9166_0.conda
osx-arm64/sccache-0.7.4-hc33459c_0.conda
osx-64/sccache-0.7.4-hdd7f814_0.conda
linux-aarch64/sccache-0.7.4-h5a25046_0.conda
linux-64/sccache-0.7.4-h06160fa_0.conda

[jakirkham]

@conda-forge/sccache , what do you think about marking the packages above broken?

As noted by Rob above, those versions are not caching effectively, which seems undesirable