Add zlib feature to compiler-rt lit config

[ormris]

Summary

A new test was added to libfuzzer in r352265 that requires zlib. Our internal
buildbot doesn’t have zlib installed and other projects (llvm, clang) allow us
to add this as a “REQUIRES” flag. This change adds this flag to the compiler-rt
project.

[ormris]

Move this change to the top level of compiler-rt lit config.

[ormris]

Update again due to git confusion.

[eugenis]

LGTM

compiler-rt/test/lit.common.configured.in

49 ↗

(On Diff #184000)

Use set_default for consistency. I doubt anything would want to override this setting, but still.

compiler-rt/trunk/test/lit.common.cfg

 if platform.system() == 'Windows' and '-win' in config.target_triple:
   config.environment['LIB'] = os.environ['LIB']
 
 config.available_features.add(config.host_os.lower())
 
 if re.match(r'^x86_64.*-linux', config.target_triple):
   config.available_features.add("x86_64-linux")
 
+if config.have_zlib == "1":
+  config.available_features.add("zlib")
+
 # Use ugly construction to explicitly prohibit "clang", "clang++" etc.
 # in RUN lines.
 config.substitutions.append(
     (' clang', """\n\n*** Do not use 'clangXXX' in tests,
      instead define '%clangXXX' substitution in lit config. ***\n\n""") )
 
 # Allow tests to be executed on a simulator or remotely.
 if config.emulator:

compiler-rt/trunk/test/lit.common.configured.in

 set_default("have_rpc_xdr_h", @HAVE_RPC_XDR_H@)
 config.available_features.add('target-is-%s' % config.target_arch)
 
 if config.enable_per_target_runtime_dir:
   set_default("target_suffix", "")
 else:
   set_default("target_suffix", "-%s" % config.target_arch)
 
+set_default("have_zlib", "@HAVE_LIBZ@")
+
 # LLVM tools dir can be passed in lit parameters, so try to
 # apply substitution.
 try:
   config.llvm_tools_dir = config.llvm_tools_dir % lit_config.params
   config.clang = config.clang % lit_config.params
   config.compiler_rt_libdir = config.compiler_rt_libdir % lit_config.params
 except KeyError as e:
   key, = e.args
   lit_config.fatal("unable to find %r parameter, use '--param=%s=VALUE'" % (key, key))
 
 if not os.path.exists(config.clang):
   lit_config.fatal("Can't find compiler on path %r" % config.clang)
 
 # Setup attributes common for all compiler-rt projects.
 lit_config.load_config(config, "@COMPILER_RT_SOURCE_DIR@/test/lit.common.cfg")