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rules_foreign_cc/examples/cmake_crosstool/BUILD
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

30 lines
754 B
Python

load("@rules_foreign_cc//tools/build_defs:cmake.bzl", "cmake_external")
filegroup(
name = "srcs",
srcs = glob(["**"]),
visibility = ["//src/test/shell/bazel/testdata:__pkg__"],
)
cc_library(
name = "hello",
srcs = ["hello.cc"],
)
cmake_external(
name = "hello_cmake",
lib_source = "//static:srcs",
generate_crosstool_file = True,
static_libraries = ["libhello.a"],
out_include_dir = "include/version123",
)
# I do not make it a test, since it is a cross-compilation example,
# requires test that just checks something about output
cc_binary(
name = "libhello_test",
# includes just hello.h, include directory: "include/version123"
srcs = ["//static:hello_client.c"],
deps = [":hello_cmake"],
)