failed to build example

[Crazyokd]

I use meson and setup with below option:

meson setup build \
    -DPISTACHE_USE_RAPIDJSON=true   \
    -DPISTACHE_BUILD_EXAMPLES=true  \
    -DPISTACHE_BUILD_DOCS=true          \
    -DPISTACHE_USE_CONTENT_ENCODING_DEFLATE=true  \
    --prefix=`pwd`/install

but after I execute meson compile -C build. I got:

[20/42] Compiling C++ object examples/runrest_description.p/rest_description.cc.o
FAILED: examples/runrest_description.p/rest_description.cc.o 
c++ -Iexamples/runrest_description.p -Iexamples -I../examples -Iinclude -I../include -fdiagnostics-color=always -DNDEBUG -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -Wextra -Wpedantic -std=c++17 -O3 -Wconversion -Wno-sign-conversion -Wno-missing-field-initializers -pthread -DPISTACHE_USE_CONTENT_ENCODING_DEFLATE -MD -MQ examples/runrest_description.p/rest_description.cc.o -MF examples/runrest_description.p/rest_description.cc.o.d -o examples/runrest_description.p/rest_description.cc.o -c ../examples/rest_description.cc
In file included from ../examples/rest_description.cc:17:
../include/pistache/serializer/rapidjson.h:15:10: fatal error: rapidjson/prettywriter.h: No such file or directory
   15 | #include <rapidjson/prettywriter.h>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
[33/42] Compiling C++ object src/libpistache.so.0.3.1.p/server_router.cc.o
ninja: build stopped: subcommand failed.

From compile command, I can't find corresponding -I option. but I checked meson configure and do not find any problem.

[kiplingw]

@Crazyokd, you're missing the headers for rapidjson.

$ sudo apt install rapidjson-dev

[Crazyokd]

But isn't rapidjson in subprojects?

in subprojects/rapidjson-1.1.0/meson.build, we have

rapidjson_inc = include_directories('include')
rapidjson_dep = declare_dependency(include_directories: rapidjson_inc)

in meson.build, we add it to deps_libpistache.

if get_option('PISTACHE_USE_RAPIDJSON')
	deps_libpistache += dependency('RapidJSON', fallback: ['rapidjson', 'rapidjson_dep'])
endif

int src/meson.build, we add it to pistache_dep.

libpistache = library(
	'pistache',
	sources: pistache_common_src + pistache_server_src + pistache_client_src,
	cpp_args: public_args,
	include_directories: incl_pistache,
	dependencies: deps_libpistache,
	install: get_option('PISTACHE_INSTALL'),
	version: version_str,
	pic: get_option('b_staticpic')
)

pistache_dep = declare_dependency(
	compile_args: public_args,
	include_directories: incl_pistache,
	link_with: libpistache
)

in examples/meson.build, we use pistache_dep.

foreach example_name : pistache_example_files
	executable('run'+example_name, example_name+'.cc', dependencies: [pistache_dep, threads_dep])
endforeach

[Crazyokd]

And if I use rapidjson_dep in examples/meson directly. like below:

foreach example_name : pistache_example_files
	executable('run'+example_name, example_name+'.cc', dependencies: [pistache_dep, threads_dep, dependency('RapidJSON', fallback: ['rapidjson', 'rapidjson_dep'])])
endforeach

I can compile it!

[Crazyokd]

I guess the libpistache do not really use rapidjson. so in libpistache the corresponding information was lost(optimized?).
We can fix it by adding dependency in examples/meson.build directly.