Bash function to build, sanitise, debug and PGO profile a single source C++ file such as a (header-only) library test file

compile++.sh

function compile++ {
    local outfn="${1%.*}"
    ionice -c 3 \
    nice -n 19 \
    g++ \
        -std=gnu++17 \
        -pipe \
        -march=haswell \
        -mtune=skylake \
        -O3 \
        -fconstexpr-loop-limit=2147483647 \
        -fstack-protector-strong \
        -flto \
        -fno-fat-lto-objects \
        -fuse-linker-plugin \
        -fdiagnostics-color=always \
        -fbounds-check \
        -fstack-check \
        -fsanitize=undefined,address \
        -ggdb \
        -Wl\,--unresolved-symbols=report-all \
        -Wl\,--print-memory-usage \
        -Wno-packed-bitfield-compat \
        -Wall \
        -Wextra \
        -Wuninitialized \
        -Wnull-dereference \
        -Wdouble-promotion \
        -Wchkp \
        -Wmisleading-indentation \
        -Wduplicated-cond \
        -Wduplicated-branches \
        -Wlogical-op \
        -Wrestrict \
        -Wshadow \
        -Wformat=2 \
        -Wno-pmf-conversions \
        -Wuseless-cast \
        -o "${outfn}" "$1" || return $?

    # Valgrind does not combine with the run-time sanitizer:
    # valgrind --track-origins=yes --leak-check=full ./"${outfn}"
    echo "*** Running with full instrumentation (run-time sanitizer) and debugging:" && sleep 30s && \
    ./"${outfn}"

    if [ $? -eq 0 ]; then

        ionice -c 3 \
        nice -n 19 \
        g++ \
            -std=gnu++17 \
            -pipe \
            -march=haswell \
            -mtune=skylake \
            -O3 \
            -fconstexpr-loop-limit=2147483647 \
            -flto \
            -fno-fat-lto-objects \
            -fuse-linker-plugin \
            -fdiagnostics-color=always \
            -fprofile-generate \
            --coverage \
            -o "${outfn}" "$1" && \
        echo "*** Running optimized and PGO instrumented:" &&  sleep 30s &&\
        ./"${outfn}" && \
        ionice -c 3 \
        nice -n 19 \
        g++ \
            -std=gnu++17 \
            -pipe \
            -march=haswell \
            -mtune=skylake \
            -O3 \
            -fconstexpr-loop-limit=2147483647 \
            -flto \
            -fno-fat-lto-objects \
            -fuse-linker-plugin \
            -fdiagnostics-color=always \
            -fprofile-use \
            -o "${outfn}.pgo" "$1" && \
        echo "*** Running optimized and PGO profiled:" && sleep 30s && \
        ./"${outfn}.pgo"

        gcov "$1" -mrblf > /dev/null
    else
        gdb -ex "set logging file /tmp/gdb-$1-`date +%Y-%m-%d_%H:%M:%S`.txt" -ex "set logging on" -ex run -ex bt -ex quit "${outfn}"
    fi
}
complete -f -X '!*.@(cpp|cxx|c++|CPP|CXX|C++)' compile++