From bb9c221f2a28f90f3ca20f657424d3ff05fcbbd3 Mon Sep 17 00:00:00 2001
From: Oscar Fuentes <ofv@wanadoo.es>
Date: Sun, 9 Nov 2008 18:53:19 +0000
Subject: [PATCH] CMake: Support for cross-compiling. For now, requires a
 previously built native tblgen which is passed to cmake in the variable
 LLVM_TABLEGEN.

See

http://www.cmake.org/Wiki/CmakeMingw

for a quick example on how to cross-compile with CMake.

llvm-svn: 58939
---
 CMakeLists.txt                               |  9 ++++++++-
 cmake/modules/AddPartiallyLinkedObject.cmake |  2 +-
 cmake/modules/CrossCompileLLVM.cmake         |  6 ++++++
 cmake/modules/TableGen.cmake                 |  2 +-
 tools/llvm-config/CMakeLists.txt             | 10 +++++++++-
 tools/llvmc2/driver/CMakeLists.txt           |  2 +-
 6 files changed, 26 insertions(+), 5 deletions(-)
 create mode 100644 cmake/modules/CrossCompileLLVM.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4c013327720..f634503b453 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -111,10 +111,17 @@ add_subdirectory(lib/System)
 # Everything else depends on Support and System:
 set(LLVM_COMMON_DEPENDS ${LLVM_COMMON_DEPENDS} ${LLVM_LIBS} )
 
+set(LLVM_TABLEGEN "tblgen" CACHE
+  STRING "Native TableGen executable.")
+
+if( CMAKE_CROSSCOMPILING )
+  include( CrossCompileLLVM )
+endif( CMAKE_CROSSCOMPILING )
+
 add_subdirectory(utils/TableGen)
 
 add_custom_command(OUTPUT ${llvm_builded_incs_dir}/Intrinsics.gen
-  COMMAND tblgen -gen-intrinsic -I ${LLVM_MAIN_INCLUDE_DIR} ${LLVM_MAIN_INCLUDE_DIR}/llvm/Intrinsics.td -o ${llvm_builded_incs_dir}/Intrinsics.gen
+  COMMAND ${LLVM_TABLEGEN} -gen-intrinsic -I ${LLVM_MAIN_INCLUDE_DIR} ${LLVM_MAIN_INCLUDE_DIR}/llvm/Intrinsics.td -o ${llvm_builded_incs_dir}/Intrinsics.gen
   DEPENDS tblgen
   COMMENT "Building intrinsics.gen...")
 
diff --git a/cmake/modules/AddPartiallyLinkedObject.cmake b/cmake/modules/AddPartiallyLinkedObject.cmake
index 4da8eac3f29..d607306dfe2 100755
--- a/cmake/modules/AddPartiallyLinkedObject.cmake
+++ b/cmake/modules/AddPartiallyLinkedObject.cmake
@@ -24,7 +24,7 @@ macro(add_partially_linked_object lib)
       DEPENDS ${lib}
       WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/temp_lib
       COMMAND ar x ${CMAKE_STATIC_LIBRARY_PREFIX}${lib}${CMAKE_STATIC_LIBRARY_SUFFIX}
-      COMMAND ld "${LLVM_PLO_FLAGS}" -r "*${CMAKE_CXX_OUTPUT_EXTENSION}" -o ${pll}
+      COMMAND ${CMAKE_LINKER} "${LLVM_PLO_FLAGS}" -r "*${CMAKE_CXX_OUTPUT_EXTENSION}" -o ${pll}
       COMMAND rm -f *${CMAKE_CXX_OUTPUT_EXTENSION}
       )
     target_name_of_partially_linked_object(${lib} tnplo)
diff --git a/cmake/modules/CrossCompileLLVM.cmake b/cmake/modules/CrossCompileLLVM.cmake
new file mode 100644
index 00000000000..0377c056142
--- /dev/null
+++ b/cmake/modules/CrossCompileLLVM.cmake
@@ -0,0 +1,6 @@
+# TODO: Build a native tblgen when cross-compiling, if the user
+# didn't set LLVM_TABLEGEN. Then, remove this check:
+if( CMAKE_CROSSCOMPILING AND ${LLVM_TABLEGEN} STREQUAL "tblgen" )
+  message(FATAL_ERROR
+    "Set LLVM_TABLEGEN to the full route to a native tblgen executable")
+endif()
diff --git a/cmake/modules/TableGen.cmake b/cmake/modules/TableGen.cmake
index c332ed1ac48..6d69e8ae912 100644
--- a/cmake/modules/TableGen.cmake
+++ b/cmake/modules/TableGen.cmake
@@ -4,7 +4,7 @@
 
 macro(tablegen ofn)
   add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
-    COMMAND tblgen ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR} -I ${CMAKE_SOURCE_DIR}/lib/Target -I ${LLVM_MAIN_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS} -o ${ofn}
+    COMMAND ${LLVM_TABLEGEN} ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR} -I ${CMAKE_SOURCE_DIR}/lib/Target -I ${LLVM_MAIN_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS} -o ${ofn}
     DEPENDS tblgen ${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS}
     COMMENT "Building ${ofn}..."
     )
diff --git a/tools/llvm-config/CMakeLists.txt b/tools/llvm-config/CMakeLists.txt
index b5551bb132e..9f1f2f2d311 100644
--- a/tools/llvm-config/CMakeLists.txt
+++ b/tools/llvm-config/CMakeLists.txt
@@ -63,8 +63,16 @@ set(LLVM_CONFIG_IN ${CMAKE_CURRENT_BINARY_DIR}/llvm-config.in)
 # set(LIBDEPS_TMP LibDeps.txt.tmp)
 # set(FINAL_LIBDEPS FinalLibDeps.txt)
 
+if( CMAKE_CROSSCOMPILING )
+  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
+endif()
+
+if( NOT NM_PATH )
+  message(FATAL_ERROR "`nm' was not found")
+endif()
+
 add_custom_command(OUTPUT ${LIBDEPS_TMP}
-  COMMAND ${PERL_EXECUTABLE} ${LLVM_MAIN_SRC_DIR}/utils/GenLibDeps.pl -flat ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY} > ${LIBDEPS_TMP}
+  COMMAND ${PERL_EXECUTABLE} ${LLVM_MAIN_SRC_DIR}/utils/GenLibDeps.pl -flat ${CMAKE_ARCHIVE_OUTPUT_DIRECTORY} ${NM_PATH} > ${LIBDEPS_TMP}
   COMMENT "Regenerating ${LIBDEPS_TMP}")
 
 add_custom_command(OUTPUT ${LIBDEPS}
diff --git a/tools/llvmc2/driver/CMakeLists.txt b/tools/llvmc2/driver/CMakeLists.txt
index 538f8974a37..6a7a2a8f011 100644
--- a/tools/llvmc2/driver/CMakeLists.txt
+++ b/tools/llvmc2/driver/CMakeLists.txt
@@ -3,7 +3,7 @@ set(LLVM_REQUIRES_EH 1)
 
 macro(tgen ofn)
   add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
-    COMMAND tblgen ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR} -I ${CMAKE_SOURCE_DIR}/lib/Target -I ${LLVM_MAIN_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/Graph.td -o ${ofn}
+    COMMAND ${LLVM_TABLEGEN} ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR} -I ${CMAKE_SOURCE_DIR}/lib/Target -I ${LLVM_MAIN_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/Graph.td -o ${ofn}
     DEPENDS
     tblgen
     ${LLVM_MAIN_INCLUDE_DIR}/llvm/CompilerDriver/Common.td