examples/custom_toolchain/sample_compiler

#!/usr/bin/env bash
#
# Sample script demonstrating custom C++ toolchain selection: handles
# the command that translates a cc_library's .cc (source file) into .o  (object
# file).

echo "$0: running sample cc_library compiler (produces .o output)."

# https://docs.bazel.build/versions/master/cc-toolchain-config-reference.html
# defines fancier ways to generate custom command lines. This script just shows
# the default, which looks like:
#
# examples/custom_toolchain/sample_compiler <various compiler flags> -o bazel-out/x86-fastbuild/bin/examples/custom_toolchain/_objs/buildme/buildme.o.

# The .o is the last parameter.
OBJECT_FILE=${@: -1}
# Swap out .o for .d to get expected .d (source dependency output).
DOTD_FILE=${OBJECT_FILE%?}d

echo "$0: sample .o output" > $OBJECT_FILE
echo "sample .d output ($0)" > $DOTD_FILE