From 5182c97e8f15d72eaac6b4b4ad93729130343011 Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@chromium.org>
Date: Wed, 13 Jun 2018 05:32:22 +0000
Subject: Reland "Passthrough additional flags to custom libcxx CMake build"

This is needed when we're cross-compiling compiler-rt.

Differential Revision: https://reviews.llvm.org/D47834

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@334570 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/Modules/AddCompilerRT.cmake | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)

(limited to 'cmake')

diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
index 2383670a9..95432e298 100644
--- a/cmake/Modules/AddCompilerRT.cmake
+++ b/cmake/Modules/AddCompilerRT.cmake
@@ -474,11 +474,6 @@ macro(add_custom_libcxx name prefix)
   endif()
 
   cmake_parse_arguments(LIBCXX "USE_TOOLCHAIN" "" "DEPS;CFLAGS;CMAKE_ARGS" ${ARGN})
-  foreach(flag ${LIBCXX_CFLAGS})
-    set(flagstr "${flagstr} ${flag}")
-  endforeach()
-  set(LIBCXX_C_FLAGS ${flagstr})
-  set(LIBCXX_CXX_FLAGS ${flagstr})
 
   if(LIBCXX_USE_TOOLCHAIN)
     set(compiler_args -DCMAKE_C_COMPILER=${COMPILER_RT_TEST_COMPILER}
@@ -514,9 +509,29 @@ macro(add_custom_libcxx name prefix)
   add_custom_target(${name}-clobber
     DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${name}-clobber-stamp)
 
-  if(CMAKE_SYSROOT)
-    set(sysroot_arg -DCMAKE_SYSROOT=${CMAKE_SYSROOT})
-  endif()
+  set(PASSTHROUGH_VARIABLES
+    CMAKE_C_COMPILER_TARGET
+    CMAKE_CXX_COMPILER_TARGET
+    CMAKE_INSTALL_PREFIX
+    CMAKE_MAKE_PROGRAM
+    CMAKE_LINKER
+    CMAKE_AR
+    CMAKE_RANLIB
+    CMAKE_NM
+    CMAKE_OBJCOPY
+    CMAKE_OBJDUMP
+    CMAKE_STRIP
+    CMAKE_SYSROOT
+    CMAKE_SYSTEM_NAME)
+  foreach(variable ${PASSTHROUGH_VARIABLES})
+    if(${variable})
+      list(APPEND CMAKE_PASSTHROUGH_VARIABLES -D${variable}=${${variable}})
+    endif()
+  endforeach()
+
+  string(REPLACE ";" " " FLAGS_STRING "${LIBCXX_CFLAGS}")
+  set(LIBCXX_C_FLAGS "${FLAGS_STRING}")
+  set(LIBCXX_CXX_FLAGS "${FLAGS_STRING}")
 
   ExternalProject_Add(${name}
     DEPENDS ${name}-clobber ${LIBCXX_DEPS}
@@ -524,13 +539,11 @@ macro(add_custom_libcxx name prefix)
     SOURCE_DIR ${COMPILER_RT_LIBCXX_PATH}
     STAMP_DIR ${STAMP_DIR}
     BINARY_DIR ${BINARY_DIR}
-    CMAKE_ARGS -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
+    CMAKE_ARGS ${CMAKE_PASSTHROUGH_VARIABLES}
                ${compiler_args}
-               ${sysroot_arg}
                -DCMAKE_C_FLAGS=${LIBCXX_C_FLAGS}
                -DCMAKE_CXX_FLAGS=${LIBCXX_CXX_FLAGS}
                -DCMAKE_BUILD_TYPE=Release
-               -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
                -DLLVM_PATH=${LLVM_MAIN_SRC_DIR}
                -DLLVM_BINARY_DIR=${prefix}
                -DLLVM_LIBRARY_OUTPUT_INTDIR=${prefix}/lib
-- 
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