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# This file defines a template for adding a unittest binary.
#
# It's a thin wrapper around GN's built-in executable() target type and
# accepts the same parameters, and in addition this paramater:
#
# has_custom_main (optional)
# [bool] If set, link against gtest instead of UnitTestMain; for tests
# that define their own main() function.
#
# Example use:
#
# unittest("FormatTest") {
# sources = [ ... ]
# ...
# }
template("unittest") {
executable(target_name) {
has_custom_main = false # Default value.
# Foward everything (has_custom_main if set; configs, sources, deps, ...).
forward_variables_from(invoker, "*")
assert(!defined(invoker.output_dir), "cannot set unittest output_dir")
assert(!defined(invoker.testonly), "cannot set unittest testonly")
# Common settings for all unit tests.
# Unit test binaries shouldn't go right in out/gn/bin, for two reasons:
# 1. That's where production binaries go.
# 2. The CMake build doesn't put the unit tests of all projects (clang,
# lld,...) in one directory, so it's not guaranteed that there won't
# be name collisions between test binaries from separate projects.
# Each lit suite takes an foo_obj_root parameter and puts temporary files
# for lit tests at foo_obj_root/test and looks for unit test binaries
# below foo_obj_root/unittests. As long as the BUILD.gn files processing
# the lit.site.cfg.py.in files match the output dir here, it doesn't
# matter all that much where the unit test binaries go, with the weak
# constraints that test binaries of different projects should go in
# different folders, and that it's not too difficult to manually
# run the unit test binary if necessary. Using target_out_dir here
# means that //clang/unittests/Format gets its binary in
# out/gn/obj/clang/unittests/Format/FormatTests, which seems fine.
#
# If you change output_dir here, look through
# `git grep target_out_dir '*/unittests/*'` and update those too.
output_dir = target_out_dir
if (has_custom_main) {
deps += [ "//third-party/unittest:gtest" ]
} else {
deps += [ "//third-party/unittest/UnitTestMain" ]
}
testonly = true
}
}
set_defaults("unittest") {
configs = shared_binary_target_configs
}
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