[compiler-rt] Use ZLIB_FOUND not LLVM_ENABLE_ZLIB

LLVM_ENABLE_ZLIB is set to On by default and does not imply that ZLIB
was actually found, only being set to FORCE_ON would imply that it was
found before control reached compiler-rt/test/CMakeLists.txt. Instead,
use ZLIB_FOUND which guarantees that zlib is available.

Differential Revision: https://reviews.llvm.org/D151229

compiler-rt/test/CMakeLists.txt

@@ -12,6 +12,9 @@ option(COMPILER_RT_TEST_STANDALONE_BUILD_LIBS
 pythonize_bool(COMPILER_RT_TEST_STANDALONE_BUILD_LIBS)
 
 pythonize_bool(LLVM_ENABLE_EXPENSIVE_CHECKS)
+
+pythonize_bool(ZLIB_FOUND)
+
 configure_compiler_rt_lit_site_cfg(
   ${CMAKE_CURRENT_SOURCE_DIR}/lit.common.configured.in
   ${CMAKE_CURRENT_BINARY_DIR}/lit.common.configured)

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

@@ -231,7 +231,7 @@ if re.match(r"^x86_64.*-linux", config.target_triple):
 
 config.available_features.add("host-byteorder-" + sys.byteorder + "-endian")
 
-if config.have_zlib == "1":
+if config.have_zlib:
     config.available_features.add("zlib")
 
 # Use ugly construction to explicitly prohibit "clang", "clang++" etc.

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

@@ -65,7 +65,7 @@ elif config.android:
 else:
   set_default("target_suffix", "-%s" % config.target_arch)
 
-set_default("have_zlib", "@LLVM_ENABLE_ZLIB@")
+set_default("have_zlib", @ZLIB_FOUND_PYBOOL@)
 set_default("libcxx_used", "@LLVM_LIBCXX_USED@")
 
 # LLVM tools dir can be passed in lit parameters, so try to