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120 lines
3.5 KiB
120 lines
3.5 KiB
# Copyright 2020 The Pigweed Authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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import("//build_overrides/pigweed.gni")
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import("$dir_pw_build/exec.gni")
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import("$dir_pw_build/target_types.gni")
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import("$dir_pw_toolchain/generate_toolchain.gni")
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# Preprocess a linker script and turn it into a target.
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#
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# In lieu of direct GN support for linker scripts, this template makes it
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# possible to run the C Preprocessor on a linker script file so defines can
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# be properly evaluated before the linker script is passed to the dir_pw_build
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#
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# TODO(pwbug/53): This template serves as a stand-in until native GN support for
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# linker scripts is added.
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#
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# Args:
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# linker_script: The linker script to send through the C preprocessor.
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#
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# defines: Preprocessor defines to apply when running the C preprocessor.
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#
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# cflags: Flags to pass to the C compiler.
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#
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# inputs: Files that, when changed, should trigger a re-build of the linker
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# script. linker_script is implicitly added to this by the template.
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#
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# Example:
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#
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# pw_linker_script("generic_linker_script") {
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# defines = [
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# "PW_HEAP_SIZE=1K",
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# "PW_NOINIT_SIZE=512"
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# ]
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# linker_script = "basic_script.ld"
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# }
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#
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template("pw_linker_script") {
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assert(
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defined(invoker.linker_script) && invoker.linker_script != "",
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"$target_name did not set `linker_script` to refer to a valid linker " +
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"script. This variable is required for linker script targets.")
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_final_linker_script = "${target_gen_dir}/${target_name}_final.ld"
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# This action invokes the C compiler provided by the target to preprocess the
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# linker script.
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pw_exec("${target_name}_preprocess") {
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program = pw_toolchain_SCOPE.cxx
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inputs = [ invoker.linker_script ]
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args = [
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# Run compiler in preprocessor-only mode.
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"-E",
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# Do not generate linemarkers in output.
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"-P",
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# Do not discard comments.
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"-C",
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# Treat the following file as a C file.
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"-x",
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"c",
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rebase_path(invoker.linker_script),
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]
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# Include any explicitly listed c flags.
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if (defined(invoker.cflags)) {
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args += cflags
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}
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# Add defines.
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if (defined(invoker.defines)) {
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foreach(compiler_define, invoker.defines) {
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args += [ "-D${compiler_define}" ]
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}
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}
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# Set output file.
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args += [
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"-o",
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rebase_path(_final_linker_script),
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]
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outputs = [ _final_linker_script ]
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}
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# This config adds a the linker script produced by the preprocess action to
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# the linker flags.
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config("${target_name}_config") {
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inputs = [ invoker.linker_script ]
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if (!defined(invoker.ldflags)) {
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ldflags = []
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}
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ldflags += [ "-T" + rebase_path(_final_linker_script) ]
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}
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# The target that adds the linker script config to this library and everything
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# that depends on it.
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pw_source_set(target_name) {
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inputs = [ _final_linker_script ]
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if (defined(invoker.inputs)) {
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inputs += invoker.inputs
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}
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all_dependent_configs = [ ":${target_name}_config" ]
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deps = [ ":${target_name}_preprocess" ]
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}
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}
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