mapnik fails to build in alpine undefined reference to mapnik::feature_style_processor

[Ghoughpteighbteau]

Error is:

c++ -o demo/c++/rundemo demo/c++/rundemo.o -Ldeps/agg -Lsrc -Lsrc/json -Lsrc/wkt -Lfreetype -L/usr/lib -lmapnik -lagg -lboost_filesystem -lboost_regex -lcairo -lpng -lproj -lsqlite3 -ltiff -lwebp -licui18n -lboost_system -lharfbuzz -ljpeg -licuuc -lfreetype -lz -ldl -lsqlite3 -lpthread
/usr/lib/gcc/x86_64-alpine-linux-musl/10.3.1/../../../../x86_64-alpine-linux-musl/bin/ld: demo/c++/rundemo.o: in function `main':
rundemo.cpp:(.text.startup+0x2781): undefined reference to `mapnik::feature_style_processor<mapnik::agg_renderer<mapnik::image<mapnik::rgba8_t>, mapnik::label_collision_detector4> >::apply(double)'
/usr/lib/gcc/x86_64-alpine-linux-musl/10.3.1/../../../../x86_64-alpine-linux-musl/bin/ld: rundemo.cpp:(.text.startup+0x2b9c): undefined reference to `mapnik::feature_style_processor<mapnik::cairo_renderer<std::shared_ptr<_cairo> > >::apply(double)'
collect2: error: ld returned 1 exit status
scons: *** [demo/c++/rundemo] Error 1

I'm building it inside a container to make sure the environment is pristine and reproduce-able, and this Dockerfile is as close a translation of https://github.com/mapnik/mapnik/blob/master/INSTALL.md as I can get.

FROM alpine:3.15

RUN apk update && apk upgrade
RUN apk add git

WORKDIR /source

RUN git clone "https://github.com/mapnik/mapnik"\
 && cd mapnik\
 && git submodule update --init
WORKDIR /source/mapnik

RUN apk add\
 make\
 python3\
 musl-dev\
 g++\
 boost\
 boost-dev\
 icu\
 icu-dev\
 zlib\
 zlib-dev\
 freetype\
 freetype-dev\
 libxml2\
 libxml2-dev\
 harfbuzz\
 harfbuzz-dev\
 libpng\
 libpng-dev\
 libjpeg\
 libjpeg-turbo-dev\
 tiff\
 tiff-dev\
 libwebp\
 libwebp-dev\
 proj\
 proj-dev\
 cairo\
 cairo-dev\
 libpq\
 libpq-dev\
 gdal\
 gdal-dev\
 sqlite\
 sqlite-dev

ENV PYTHON=python3
RUN ./configure
RUN make || true #preserve if fail
RUN make

This error looks similar to #4264

Is this something that should be added to install.md? I dunno I'm a little lost in all this.

[mathisloge]

I think this is an issue with some scons config. But I don't know anything about SCons.
#4249 #4243 seem to have the same issues

[Ghoughpteighbteau]

is there a different set of build instructions I should follow?

[mathisloge]

There is either SCons or CMake as a build system available. So you can choose between them.
General CMake instructions are here https://github.com/mapnik/mapnik/blob/master/docs/cmake-usage.md

See for an example Docker with CMake: #4267 or with scons https://github.com/jawg/docker-mapnik3 (Note that the latter one does not use the latest master).