[libunwind] r353084 - [CMake] Support CMake variables for setting target, sysroot and toolchain

[Petr Hosek via cfe-commits]

Author: phosek
Date: Mon Feb  4 12:02:26 2019
New Revision: 353084

URL: http://llvm.org/viewvc/llvm-project?rev=353084&view=rev
Log:
[CMake] Support CMake variables for setting target, sysroot and toolchain

CMake has a standard way of setting target triple, sysroot and external
toolchain through CMAKE_<LANG>_COMPILER_TARGET, CMAKE_SYSROOT and
CMAKE_<LANG>_COMPILER_EXTERNAL_TOOLCHAIN. These are turned into
corresponding --target=, --sysroot= and --gcc-toolchain= variables add
included appended to CMAKE_<LANG>_FLAGS.

libunwind, libc++abi, libc++ provides their own mechanism through
<PROJECT>_TARGET_TRIPLE, <PROJECT>_SYSROOT and <PROJECT>_GCC_TOOLCHAIN
variables. These are also passed to lit via lit.site.cfg, and lit config
uses these to set the corresponding compiler flags when building tessts.

This means that there are two different ways of setting target, sysroot
and toolchain, but only one is properly supported in lit. This change
extends CMake build for libunwind, libc++abi and libc++ to also support
the CMake variables in addition to project specific ones in lit.

Differential Revision: https://reviews.llvm.org/D57670

Modified:
    libunwind/trunk/CMakeLists.txt
    libunwind/trunk/test/lit.site.cfg.in

Modified: libunwind/trunk/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/libunwind/trunk/CMakeLists.txt?rev=353084&r1=353083&r2=353084&view=diff
==============================================================================
--- libunwind/trunk/CMakeLists.txt (original)
+++ libunwind/trunk/CMakeLists.txt Mon Feb  4 12:02:26 2019
@@ -225,12 +225,22 @@ macro(add_target_flags_if condition var)
 endmacro()
 
 add_target_flags_if(LIBUNWIND_BUILD_32_BITS "-m32")
-add_target_flags_if(LIBUNWIND_TARGET_TRIPLE
-          "--target=${LIBUNWIND_TARGET_TRIPLE}")
-add_target_flags_if(LIBUNWIND_GCC_TOOLCHAIN
-          "--gcc-toolchain=${LIBUNWIND_GCC_TOOLCHAIN}")
-add_target_flags_if(LIBUNWIND_SYSROOT
-          "--sysroot=${LIBUNWIND_SYSROOT}")
+
+if(LIBUNWIND_TARGET_TRIPLE)
+  add_target_flags("--target=${LIBUNWIND_TARGET_TRIPLE}")
+elseif(CMAKE_CXX_COMPILER_TARGET)
+  set(LIBUNWIND_TARGET_TRIPLE "${CMAKE_CXX_COMPILER_TARGET}")
+endif()
+if(LIBUNWIND_GCC_TOOLCHAIN)
+  add_target_flags("--gcc-toolchain=${LIBUNWIND_GCC_TOOLCHAIN}")
+elseif(CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN)
+  set(LIBUNWIND_GCC_TOOLCHAIN "${CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN}")
+endif()
+if(LIBUNWIND_SYSROOT)
+  add_target_flags("--sysroot=${LIBUNWIND_SYSROOT}")
+elseif(CMAKE_SYSROOT)
+  set(LIBUNWIND_SYSROOT "${CMAKE_SYSROOT}")
+endif()
 
 if (LIBUNWIND_TARGET_TRIPLE)
   set(TARGET_TRIPLE "${LIBUNWIND_TARGET_TRIPLE}")

Modified: libunwind/trunk/test/lit.site.cfg.in
URL: http://llvm.org/viewvc/llvm-project/libunwind/trunk/test/lit.site.cfg.in?rev=353084&r1=353083&r2=353084&view=diff
==============================================================================
--- libunwind/trunk/test/lit.site.cfg.in (original)
+++ libunwind/trunk/test/lit.site.cfg.in Mon Feb  4 12:02:26 2019
@@ -20,7 +20,7 @@ config.enable_shared            = "@LIBC
 config.enable_exceptions        = "@LIBUNWIND_ENABLE_EXCEPTIONS@"
 config.host_triple              = "@LLVM_HOST_TRIPLE@"
 config.target_triple            = "@TARGET_TRIPLE@"
-config.use_target               = len("@LIBUNWIND_TARGET_TRIPLE@") > 0
+config.use_target               = bool("@LIBUNWIND_TARGET_TRIPLE@")
 config.sysroot                  = "@LIBUNWIND_SYSROOT@"
 config.gcc_toolchain            = "@LIBUNWIND_GCC_TOOLCHAIN@"
 config.cxx_ext_threads          = "@LIBUNWIND_BUILD_EXTERNAL_THREAD_LIBRARY@"