[llvm-shlib] Fix cross-compilation for LLVM-C

When we're cross-compiling, build and use a native llvm-nm instead of
attempting to use the one from the target's build tree.

A nice follow-up would be to add a cache variable to allow specifying a
path to an external native llvm-nm instead of building one ourselves,
similar to LLVM_TABLEGEN and LLVM_CONFIG_PATH.

Differential Revision: https://reviews.llvm.org/D60025

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357487 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/tools/llvm-shlib/CMakeLists.txt b/tools/llvm-shlib/CMakeLists.txt
index af44b8ae8535ca7497ad11d4959e7e5af7bfeba0..bc5ea44e336563b293e816249be7fc7a039d27f3 100644 (file)
--- a/tools/llvm-shlib/CMakeLists.txt
+++ b/tools/llvm-shlib/CMakeLists.txt
@@ -164,9 +164,17 @@ if(MSVC)
 
   set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/libllvm-c.exports)
 
+  if(CMAKE_CROSSCOMPILING)
+    build_native_tool(llvm-nm llvm_nm)
+    set(llvm_nm_target "${llvm_nm}")
+  else()
+    set(llvm_nm $<TARGET_FILE:llvm-nm>)
+    set(llvm_nm_target llvm-nm)
+  endif()
+
   add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
-    COMMAND ${PYTHON_EXECUTABLE} ${GEN_SCRIPT} --libsfile ${LIBSFILE} ${GEN_UNDERSCORE} --nm ${LLVM_TOOLS_BINARY_DIR}/llvm-nm -o ${LLVM_EXPORTED_SYMBOL_FILE}
-    DEPENDS ${LIB_NAMES} llvm-nm
+    COMMAND ${PYTHON_EXECUTABLE} ${GEN_SCRIPT} --libsfile ${LIBSFILE} ${GEN_UNDERSCORE} --nm "${llvm_nm}" -o ${LLVM_EXPORTED_SYMBOL_FILE}
+    DEPENDS ${LIB_NAMES} ${llvm_nm_target}
     COMMENT "Generating export list for LLVM-C"
     VERBATIM )