Merge pull request RobotLocomotion#4322 from david-german-tri/crosstool

Add a CROSSTOOL file for clang on Ubuntu.

drake/doc/bazel.rst

@@ -70,6 +70,10 @@ Run a test under AddressSanitizer::
 
   bazel test --config=asan drake/systems/framework/test/diagram_test
 
+Build the entire project using clang (on Ubuntu)::
+
+  bazel build --config=clang ...
+
 Run one of the compiled programs manually, from the build outputs directory
 (note that ``bazel-bin`` is a directory name here)::
 

tools/BUILD

@@ -8,3 +8,30 @@ sh_binary(
     srcs = ["valgrind.sh"],
     data = ["valgrind.supp"],
 )
+
+cc_toolchain_suite(
+    name = "default-toolchain",
+    toolchains = {
+        "k8|clang-3.9": "cc-compiler-clang-3.9-linux",
+    },
+)
+
+filegroup(
+    name = "empty",
+    srcs = [],
+) 
+
+cc_toolchain(
+    name = "cc-compiler-clang-3.9-linux",
+    all_files = ":empty",
+    compiler_files = ":empty",
+    cpu = "k8",
+    dwp_files = ":empty",
+    dynamic_runtime_libs = [":empty"],
+    linker_files = ":empty",
+    objcopy_files = ":empty",
+    static_runtime_libs = [":empty"],
+    strip_files = ":empty",
+    supports_param_files = 0,
+)
+

tools/CROSSTOOL

@@ -0,0 +1,70 @@
+major_version: "local"
+minor_version: ""
+default_target_cpu: "same_as_host"
+default_toolchain {
+  cpu: "k8"
+  toolchain_identifier: "clang-3.9-linux"
+}
+
+toolchain {
+  abi_version: "local"
+  abi_libc_version: "local"
+  builtin_sysroot: ""
+  compiler: "clang-3.9"
+  host_system_name: "local"
+  needsPic: true
+  supports_gold_linker: false
+  supports_incremental_linker: false
+  supports_fission: false
+  supports_interface_shared_objects: false
+  supports_normalizing_ar: false
+  supports_start_end_lib: false
+  supports_thin_archives: false
+  target_libc: "local"
+  target_cpu: "k8"
+  target_system_name: "local"
+  toolchain_identifier: "clang-3.9-linux"
+
+  tool_path { name: "ar" path: "/usr/bin/ar" }
+  tool_path { name: "compat-ld" path: "/usr/bin/ld" }
+  tool_path { name: "cpp" path: "/usr/bin/cpp" }
+  tool_path { name: "dwp" path: "/usr/bin/dwp" }
+  tool_path { name: "gcc" path: "/usr/bin/clang-3.9" }
+  cxx_flag: "-std=c++14"
+  compilation_mode_flags {
+    mode: FASTBUILD
+  }
+  compilation_mode_flags {
+    mode: DBG
+    cxx_flag: "-g3"
+    compiler_flag: "-O0"
+  }
+  compilation_mode_flags {
+    mode: COVERAGE
+  }
+  compilation_mode_flags {
+    mode: OPT
+    compiler_flag: "-DNDEBUG"
+    compiler_flag: "-fno-omit-frame-pointer"
+    compiler_flag: "-O2"
+  }
+  linker_flag: "-lstdc++"
+  linker_flag: "-lm"
+  linker_flag: "-B/usr/bin/"
+
+  cxx_builtin_include_directory: "/usr/lib/gcc/"
+  cxx_builtin_include_directory: "/usr/local/include"
+  cxx_builtin_include_directory: "/usr/include"
+  cxx_builtin_include_directory: "/usr/lib/clang/3.9.1/include"
+  cxx_builtin_include_directory: "/usr/lib/llvm-3.9/lib/clang/3.9.1/include"
+
+  tool_path { name: "gcov" path: "/usr/bin/gcov" }
+  tool_path { name: "ld" path: "/usr/bin/ld" }
+  tool_path { name: "nm" path: "/usr/bin/nm" }
+  tool_path { name: "objcopy" path: "/usr/bin/objcopy" }
+  objcopy_embed_flag: "-I"
+  objcopy_embed_flag: "binary"
+  tool_path { name: "objdump" path: "/usr/bin/objdump" }
+  tool_path { name: "strip" path: "/usr/bin/strip" }
+}
+

tools/bazel.rc

@@ -10,6 +10,10 @@ build --cxxopt -std=c++1y
 # Test options.
 test --test_output=errors
 
+# Clang.
+build:clang --compiler=clang-3.9
+build:clang --crosstool_top=//tools:default-toolchain
+
 # Coverage build.
 build:coverage --strip=never
 build:coverage --copt -g