ngx_feature_incs="#include <zstd.h>"
ngx_feature_test="(void) ZSTD_createCCtx();"
ngx_feature_libs=
ngx_feature_run=yes

ngx_zstd_opt_I=
ngx_zstd_opt_L=

if [ -n "$ZSTD_INC" -o -n "$ZSTD_LIB" ]; then
    ngx_feature="ZStandard static library in $ZSTD_INC and $ZSTD_LIB"
    ngx_feature_path=$ZSTD_INC

    # we try the static shared library firstly
    ngx_zstd_opt_I="-I$ZSTD_INC -DZSTD_STATIC_LINKING_ONLY"
    ngx_zstd_opt_L="$ZSTD_LIB/libzstd.a"
    SAVED_CC_TAST_FLAGS=$CC_TEST_FLAGS
    CC_TEST_FLAGS="$ngx_zstd_opt_I $CC_TEST_FLAGS"
    SAVED_NGX_TEST_LD_OPT=$NGX_TEST_LD_OPT
    NGX_TEST_LD_OPT="$ngx_zstd_opt_L $NGX_TEST_LD_OPT"

    . auto/feature

    # restore
    CC_TEST_FLAGS=$SAVED_CC_TAST_FLAGS
    NGX_TEST_LD_OPT=$SAVED_NGX_TEST_LD_OPT

    if [ $ngx_found = no ]; then
        # then try the dynamic shared library
        ngx_feature="ZStandard dynamic library in $ZSTD_INC and $ZSTD_LIB"
        ngx_zstd_opt_L="-L$ZSTD_LIB -lzstd -Wl,-rpath, $ZSTD_LIB"

        SAVED_CC_TAST_FLAGS=$CC_TEST_FLAGS
        CC_TEST_FLAGS="$ngx_zstd_opt_I $CC_TEST_FLAGS"
        SAVED_NGX_TEST_LD_OPT=$NGX_TEST_LD_OPT
        NGX_TEST_LD_OPT="$ngx_zstd_opt_L $NGX_TEST_LD_OPT"

        . auto/feature

        # restore
        CC_TEST_FLAGS=$SAVED_CC_TAST_FLAGS
        NGX_TEST_LD_OPT=$SAVED_NGX_TEST_LD_OPT

        if [ $ngx_found = no ]; then
            cat << END
            $0: error: ngx_http_zstd_filter_module requires the ZStandard library, please be sure that "\$ZSTD_INC" and "\$ZSTD_LIB" are set correctly.
END
            exit 1
        fi

    fi
else
    # auto-discovery
    ngx_feature="ZStandard static library"
    ngx_zstd_opt_I="-DZSTD_STATIC_LINKING_ONLY"
    ngx_zstd_opt_L="-l:libzstd.a"

    # still we consider the static library firstly
    SAVED_CC_TAST_FLAGS=$CC_TEST_FLAGS
    CC_TEST_FLAGS="$ngx_zstd_opt_I $CC_TEST_FLAGS"
    SAVED_NGX_TEST_LD_OPT=$NGX_TEST_LD_OPT
    NGX_TEST_LD_OPT="$ngx_zstd_opt_L $NGX_TEST_LD_OPT"

    . auto/feature

    # restore
    CC_TEST_FLAGS=$SAVED_CC_TAST_FLAGS
    NGX_TEST_LD_OPT=$SAVED_NGX_TEST_LD_OPT

    if [ $ngx_found = no ]; then

        ngx_feature="ZStandard dynamic library"
        ngx_zstd_opt_L="-lzstd"
        SAVED_CC_TAST_FLAGS=$CC_TEST_FLAGS
        CC_TEST_FLAGS="$ngx_zstd_opt_I $CC_TEST_FLAGS"
        SAVED_NGX_TEST_LD_OPT=$NGX_TEST_LD_OPT
        NGX_TEST_LD_OPT="$ngx_zstd_opt_L $NGX_TEST_LD_OPT"

        . auto/feature

        if [ $ngx_found = no ]; then
            cat << END
            $0: error: ngx_http_zstd_filter_module requires the ZStandard library.
END
            exit 1
        fi

        # restore
        CC_TEST_FLAGS=$SAVED_CC_TAST_FLAGS
        NGX_TEST_LD_OPT=$SAVED_NGX_TEST_LD_OPT

        cat << END
        $0: warning: ngx_http_zstd_filter_module uses advanced ZStandard APIs (which are still considered experimental) while you are trying to link the dynamic shared library.
END
    fi

    # TODO we need more tries for the different OS port.
fi

CFLAGS="$ngx_zstd_opt_I $CFLAGS"
NGX_LD_OPT="$ngx_zstd_opt_L $NGX_LD_OPT"

# build the ngx_http_zstd_static_module
HTTP_ZSTD_SRCS="$ngx_addon_dir/static/ngx_http_zstd_static_module.c"

ngx_addon_name=ngx_http_zstd_static_module
ngx_module_type=HTTP
ngx_module_name=ngx_http_zstd_static_module
ngx_module_incs="$ngx_zstd_opt_I"
ngx_module_srcs=$HTTP_ZSTD_SRCS

. auto/module