esp-idf/make/build_examples.sh

#!/bin/bash
#
# Build all examples from the examples directory, out of tree to
# ensure they can run when copied to a new directory.
#
# Runs as part of CI process.
#
# Assumes CWD is an out-of-tree build directory, and will copy examples to individual subdirectories, one by one.
#
[ -z ${IDF_PATH} ] && echo "IDF_PATH is not set" && exit 1

export BATCH_BUILD=1
export V=0 # only build verbose if there's an error

EXAMPLE_NUM=1
RESULT=0
FAILED_EXAMPLES=""

RESULT_WARNINGS=22  # magic number result code for "warnings found"

# traverse categories
for category in ${IDF_PATH}/examples/*; do
    # traverse examples within each category
    for example in ${category}/*; do
        [ -f ${example}/Makefile ] || continue
        echo "Building ${example} as ${EXAMPLE_NUM}..."
        mkdir -p example_builds/${EXAMPLE_NUM}
        cp -r ${example} example_builds/${EXAMPLE_NUM}
        pushd example_builds/${EXAMPLE_NUM}/`basename ${example}`

        # be stricter in the CI build than the default IDF settings
        export EXTRA_CFLAGS="-Werror -Werror=deprecated-declarations"
        export EXTRA_CXXFLAGS=${EXTRA_CFLAGS}

        # build non-verbose first
        BUILDLOG=$(mktemp -t examplebuild.XXXX.log)
        (
            set -o pipefail  # so result of make all isn't lost when piping to tee
            set -e
            make clean defconfig
            make $* all 2>&1 | tee $BUILDLOG
        ) || { RESULT=$?; FAILED_EXAMPLES+=" ${example}"; make V=1; } # verbose output for errors
        popd
        EXAMPLE_NUM=$(( $EXAMPLE_NUM + 1 ))

        if grep -q ": warning:" $BUILDLOG; then
            [ $RESULT -eq 0 ] && RESULT=$RESULT_WARNINGS
            FAILED_EXAMPLES+=" ${example} (warnings)"
        fi

        rm -f $BUILDLOG
    done
done

if [ $RESULT -eq $RESULT_WARNINGS ]; then
    echo "Build would have passed, except for warnings."
fi

[ $RESULT -eq 0 ] || echo "Failed examples: $FAILED_EXAMPLES"

exit $RESULT