Build script for size investigations

build.sh

#!/bin/bash
set -e
set -x

export PATH=/usr/lib/ccache:$PATH

build_one() {

BUILDDIR=$1
shift

if [ ! -d $BUILDDIR ] ; then
    mkdir $BUILDDIR
fi

pushd $BUILDDIR && rm -rf *
cmake -GNinja \
    -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX=install \
    -DBUILD_SHARED_LIBS=OFF \
    -DBUILD_EXAMPLES=ON \
    -DWITH_CUDA=OFF \
    -DWITH_OPENCL=OFF \
    -DWITH_IPP=OFF \
    -DCPU_DISPATCH= \
    -DWITH_VIZ=FALSE \
    -DBUILD_TESTS=OFF \
    -DBUILD_PERF_TESTS=OFF \
    -DBUILD_opencv_java=OFF \
    -DBUILD_opencv_python2=OFF \
    -DBUILD_opencv_python3=OFF \
    $@ \
    ../opencv
ninja
popd

}


if [ ! 1 ]; then

build_one build-base \
    -DCMAKE_CXX_FLAGS="-DCVAPI_EXPORTS" \
    -DCMAKE_C_FLAGS="-DCVAPI_EXPORTS" \
    -DOPENCV_SKIP_GC_SECTIONS=ON \
    -DOPENCV_SKIP_FUNCTION_SECTIONS=ON

build_one build-base-gc \
    -DCMAKE_CXX_FLAGS="-DCVAPI_EXPORTS" \
    -DCMAKE_C_FLAGS="-DCVAPI_EXPORTS"

build_one build-1 \
    -DOPENCV_SKIP_FUNCTION_SECTIONS=ON \
    -DOPENCV_SKIP_GC_SECTIONS=ON

build_one build-2 \
    -DOPENCV_SKIP_GC_SECTIONS=ON

build_one build-3 \
    -DOPENCV_SKIP_FUNCTION_SECTIONS=ON

build_one build-final

build_one build-base-lto \
    -DCMAKE_CXX_FLAGS="-DCVAPI_EXPORTS" \
    -DCMAKE_C_FLAGS="-DCVAPI_EXPORTS" \
    -DOPENCV_SKIP_GC_SECTIONS=ON \
    -DOPENCV_SKIP_FUNCTION_SECTIONS=ON \
    -DENABLE_LTO=ON

build_one build-lto \
    -DENABLE_LTO=ON

build_one build-base-size \
    -DCMAKE_CXX_FLAGS="-DCVAPI_EXPORTS" \
    -DCMAKE_C_FLAGS="-DCVAPI_EXPORTS" \
    -DOPENCV_SKIP_GC_SECTIONS=ON \
    -DOPENCV_SKIP_FUNCTION_SECTIONS=ON \
    -DENABLE_SIZE_OPTIMIZATION=ON

build_one build-size \
    -DENABLE_SIZE_OPTIMIZATION=ON

build_one build-lto-size \
    -DENABLE_SIZE_OPTIMIZATION=ON \
    -DENABLE_LTO=ON

fi

set +x
for d in build-* ; do
    echo "Folder: $d"
    echo "  files: $(ls -1 $d/bin/cpp-example-* | wc -l)"
    echo "  size: $(du -hc $d/bin/cpp-example-* | grep total)"
    # Typical compile flags
    grep 'opencv/modules/core/src/lapack.cpp' $d/compile_commands.json
    # Typical link flags
    grep -m 1 LINK_FLAGS $d/build.ninja
    echo
done