r285741 - [test] Fix detecting LLVM zlib support in stand-alone builds

[Michal Gorny via cfe-commits]

Author: mgorny
Date: Tue Nov  1 15:31:52 2016
New Revision: 285741

URL: http://llvm.org/viewvc/llvm-project?rev=285741&view=rev
Log:
[test] Fix detecting LLVM zlib support in stand-alone builds

Fix the test run to declare missing HAVE_LIBZ value in stand-alone
builds, using the LLVM_ENABLE_ZLIB that is exported in LLVMConfig.cmake.

When using in-tree builds, HAVE_LIBZ is declared in
cmake/config-ix.cmake as a result of LLVM's CMake checks. When building
stand-alone, this value is not available and as a result caused clang to
wrongly assume that LLVM was built without zlib support.

To fix it, set it to the value of LLVM_ENABLE_ZLIB. While this variable
is originally used to control the user preference, LLVM updates its
value to 0 if zlib checks fail. Therefore, we can use it to reliably
determine whether LLVM was built with zlib support or not.

Differential Revision: https://reviews.llvm.org/D24869

Modified:
    cfe/trunk/test/CMakeLists.txt

Modified: cfe/trunk/test/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CMakeLists.txt?rev=285741&r1=285740&r2=285741&view=diff
==============================================================================
--- cfe/trunk/test/CMakeLists.txt (original)
+++ cfe/trunk/test/CMakeLists.txt Tue Nov  1 15:31:52 2016
@@ -9,6 +9,15 @@ endif ()
 
 string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} CLANG_TOOLS_DIR ${LLVM_RUNTIME_OUTPUT_INTDIR})
 
+if(CLANG_BUILT_STANDALONE)
+  # Set HAVE_LIBZ according to recorded LLVM_ENABLE_ZLIB value. This
+  # value is forced to 0 if zlib was not found, so it is fine to use it
+  # instead of HAVE_LIBZ (not recorded).
+  if(LLVM_ENABLE_ZLIB)
+    set(HAVE_LIBZ 1)
+  endif()
+endif()
+
 configure_lit_site_cfg(
   ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
   ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg