add --with-compat by default

[ruslantalpa]

without this flag, building dynamic modules, targeting a specific openresty package release is a pain. One has to use -V option to figure out the build arguments used when building the official release and jsut a copy/pasted does not work since paths are not the same

Is this flag missing on purpose?

with this flag one basically needs just ./configure --with-compat --add-dynamic-module=..

[ruslantalpa]

also when building modules, it seems --with-dtrace-probes flag breaks the process.
without the flag, at the end there is a .so file, after adding the flag, the file is not longer generated, but the build finishes successfully (i don't see any errors)

I don't know if all modules are affected or just the one i am building (https://github.com/ruslantalpa/lua-upstream-cache-nginx-module)

[agentzh]

We could add --with-compat. That seems reasonable though at a small price. Pull requests welcome :)

Not sure about the --with-dtrace-probes thing, maybe our nginx dtrace patch needs some love for dynamic module building. See here:

https://github.com/openresty/openresty/blob/master/patches/nginx-1.15.8-dtrace.patch

This patch was created before nginx has got dynamic module support. It would be great if you can help dig this up. Pull requests welcome :)

Thanks!

[ruslantalpa]

a quick followup for anyone reading this, i was able to build the module using this

./configure \
        --with-pcre-jit \
		--without-http_rds_json_module \
		--without-http_rds_csv_module \
		--without-lua_rds_parser \
		--with-stream \
		--with-stream_ssl_module \
		--with-stream_ssl_preread_module \
		--with-http_v2_module \
		--without-mail_pop3_module \
		--without-mail_imap_module \
		--without-mail_smtp_module \
		--with-http_stub_status_module \
		--with-http_realip_module \
		--with-http_addition_module \
		--with-http_auth_request_module \
		--with-http_secure_link_module \
		--with-http_random_index_module \
		--with-http_gzip_static_module \
		--with-http_sub_module \
		--with-http_dav_module \
		--with-http_flv_module \
		--with-http_mp4_module \
		--with-http_gunzip_module \
		--with-threads \
		--with-luajit-xcflags='-DLUAJIT_NUMMODE=2 -DLUAJIT_ENABLE_LUA52COMPAT' \
		--with-pcre=/tmp/pcre-${RESTY_PCRE_VERSION} \
		--with-openssl=/tmp/openssl-${RESTY_OPENSSL_VERSION} \
		--with-zlib=/tmp/zlib-${RESTY_ZLIB_VER} \
		--add-dynamic-module=/tmp/lua-upstream-cache-nginx-module

this was for openresty/openresty:1.15.8.1-2-stretch-fat

and the vars were

ENV NGINX_VERSION="1.15.8"
############ This section is copied from the parent image ##################
# Docker Build Arguments
ARG RESTY_VERSION="1.15.8.1"
# ARG RESTY_LUAROCKS_VERSION="2.4.3"
ARG RESTY_OPENSSL_VERSION="1.1.0j"
ARG RESTY_PCRE_VERSION="8.42"
ARG RESTY_ZLIB_VER="1.2.11"

it seems it's safe to eliminate --with-dtrace-probes from config params, the module will still be compatible

[ruslantalpa]

the dtrace part will probably be hard for me to figure out but the --with-compat part I will make a PR
Thank you. All I can say about dtrace patch is that it's safe to eliminate when building modules (i'll double check that today)

[ruslantalpa]

about the dtrace, if you can point me in the right direction about that patch (list of files from there that could cause this, just to narrow it down a bit), i could look into it.
thank you

[agentzh]

about the dtrace, if you can point me in the right direction about that patch (list of files from there that could cause this, just to narrow it down a bit), i could look into it.

Thanks. It might be our changes in the files under the auto/ directory, i.e., the nginx build system.