[builtins] Use libtool for builtins when building for Apple platform

compiler-rt already uses libtool instead of ar when building for
Apple platform, but that's not being used when builtins are being
built separately e.g. as part of the runtimes build. This change
extracts the logic setting up libtool into a separate file and uses
it from both the compiler-rt and standalone builtins build.

Differential Revision: https://reviews.llvm.org/D62820

llvm-svn: 362466

1 files changed, 50 insertions, 0 deletions

diff --git a/compiler-rt/cmake/Modules/UseLibtool.cmake b/compiler-rt/cmake/Modules/UseLibtool.cmake
new file mode 100644
index 00000000000..38d197d4846
--- /dev/null
+++ b/compiler-rt/cmake/Modules/UseLibtool.cmake
@@ -0,0 +1,50 @@
+# if CMAKE_LIBTOOL is not set, try and find it with xcrun or find_program
+if(NOT CMAKE_LIBTOOL)
+  if(NOT CMAKE_XCRUN)
+    find_program(CMAKE_XCRUN NAMES xcrun)
+  endif()
+  if(CMAKE_XCRUN)
+    execute_process(COMMAND ${CMAKE_XCRUN} -find libtool
+      OUTPUT_VARIABLE CMAKE_LIBTOOL
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+  endif()
+
+  if(NOT CMAKE_LIBTOOL OR NOT EXISTS CMAKE_LIBTOOL)
+    find_program(CMAKE_LIBTOOL NAMES libtool)
+  endif()
+endif()
+
+get_property(languages GLOBAL PROPERTY ENABLED_LANGUAGES)
+if(CMAKE_LIBTOOL)
+  set(CMAKE_LIBTOOL ${CMAKE_LIBTOOL} CACHE PATH "libtool executable")
+  message(STATUS "Found libtool - ${CMAKE_LIBTOOL}")
+
+  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 ${LIBTOOL_NO_WARNING_FLAG} -o <TARGET> <LINK_FLAGS> <OBJECTS>")
+  endforeach()
+endif()
+
+# If DYLD_LIBRARY_PATH is set we need to set it on archiver commands
+if(DYLD_LIBRARY_PATH)
+  set(dyld_envar "DYLD_LIBRARY_PATH=${DYLD_LIBRARY_PATH}")
+  foreach(lang ${languages})
+    foreach(cmd ${CMAKE_${lang}_CREATE_STATIC_LIBRARY})
+      list(APPEND CMAKE_${lang}_CREATE_STATIC_LIBRARY_NEW
+           "${dyld_envar} ${cmd}")
+    endforeach()
+    set(CMAKE_${lang}_CREATE_STATIC_LIBRARY
+      ${CMAKE_${lang}_CREATE_STATIC_LIBRARY_NEW})
+  endforeach()
+endif()