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rules_foreign_cc/examples/cmake_crosstool/hello.cc
irengrig 9a261f7993
Crosstool example + fixes (#174)
* Add crosstool example; does not work with cmake rule yet

the code is taken from Bazel test data (bazel_toolchain_test_data)

* Make crosstool compilation of cmake_external + cc_binary work

To build example, cd examples/cmake_crosstool bazel build //:libhello_test

Changes:
1) Initially suggested in #124: put $EXT_BUILD_ROOT on path, so that relative paths can be resolved by CMake
2) Toolchain tools are references as relative paths, and they themselves refer to external repository with external/ prefix.
This will not work with CMake, as CMake also perform compiler tests and the build is performed in some temp directory.
We need to convert to absolute paths.
I did a trick with checking of $EXT_BUILD_ROOT is defined and then using it as a prefix.
3) I had to change the visibility of the cc-compiler-k8 toolchain to public
4) For CMake crosstool file, CMAKE_C_COMPILER, CMAKE_CXX_COMPILER, CMAKE_AR need to be absolute, so in cases when they are relative and not under external directory, force paths conversion
2018-12-06 18:14:00 +01:00

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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <iostream>
int main(int argc, char* argv[]) {
std::cout << "Hello! sqrt(time) = " << std::sqrt(time(NULL)) << std::endl;
return EXIT_SUCCESS;
}