[PATCH] D27119: Use Darwin libtool's -no_warning_for_no_symbols if available to silence the "has no symbols" link warning

[Kuba (Brecka) Mracek via Phabricator via llvm-commits]

kubabrecka removed rL LLVM as the repository for this revision.
kubabrecka updated this revision to Diff 79316.

https://reviews.llvm.org/D27119

Files:
  CMakeLists.txt


Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -73,9 +73,23 @@
   if(CMAKE_LIBTOOL)
     set(CMAKE_LIBTOOL ${CMAKE_LIBTOOL} CACHE PATH "libtool executable")
     message(STATUS "Found libtool - ${CMAKE_LIBTOOL}")
+
+    set(LIBTOOL_NO_WARNING_FLAG "")
+    execute_process(COMMAND ${CMAKE_LIBTOOL} -V
+      OUTPUT_VARIABLE LIBTOOL_V_OUTPUT
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+    if("${LIBTOOL_V_OUTPUT}" MATCHES ".*cctools-([0-9.]+).*")
+      string(REGEX REPLACE ".*cctools-([0-9.]+).*" "\\1" LIBTOOL_VERSION
+        ${LIBTOOL_V_OUTPUT})
+      if(NOT LIBTOOL_VERSION VERSION_LESS "862")
+        set(LIBTOOL_NO_WARNING_FLAG "-no_warning_for_no_symbols")
+      endif()
+    endif()
+    
     foreach(lang ${languages})
       set(CMAKE_${lang}_CREATE_STATIC_LIBRARY
-        "${CMAKE_LIBTOOL} -static -o <TARGET> <LINK_FLAGS> <OBJECTS> ")
+        "${CMAKE_LIBTOOL} -static ${LIBTOOL_NO_WARNING_FLAG} -o <TARGET> \
+        <LINK_FLAGS> <OBJECTS> ")
     endforeach()
   endif()
 


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