[BUG] [cpp-pistache-server] Generated cmake project does not build

Created by: JulianGmp

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Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists?
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Description

A recent pull request in the pistache repository made changes to their build system, in which the install target was removed from the CMakeLists.txt (see diff ).

That target is used by the pistache templates, and thus building the server will currently fail. Tested on current master (7bf792a3).

Build commands used

cmake -S . -B build/
cmake --build build/ -j 1 --target all

Last bits of the output:

[ 16%] Performing build step for 'PISTACHE'
[ 91%] Built target pistache
[ 95%] Built target pistache_static
[100%] Built target pistache_shared
[ 20%] Performing install step for 'PISTACHE'
gmake[3]: *** No rule to make target 'install'.  Stop.
gmake[2]: *** [CMakeFiles/PISTACHE.dir/build.make:93: PISTACHE-prefix/src/PISTACHE-stamp/PISTACHE-install] Error 2
gmake[1]: *** [CMakeFiles/Makefile2:154: CMakeFiles/PISTACHE.dir/all] Error 2
gmake: *** [Makefile:103: all] Error 2

openapi-generator version

openapi-generator-cli 5.1.1-SNAPSHOT commit : 7bf792a3 built : 2021-04-01T11:56:22+02:00

OpenAPI declaration file content or url

The yaml was the sample from https://swagger.io/docs/specification/basic-structure/

openapi: 3.0.0
info:
  title: Sample API
  description: Optional multiline or single-line description in [CommonMark](http://commonmark.org/help/) or HTML.
  version: 0.1.9

servers:
  - url: http://api.example.com/v1
    description: Optional server description, e.g. Main (production) server
  - url: http://staging-api.example.com
    description: Optional server description, e.g. Internal staging server for testing

paths:
  /users:
    get:
      summary: Returns a list of users.
      description: Optional extended description in CommonMark or HTML.
      responses:
        '200':    # status code
          description: A JSON array of user names
          content:
            application/json:
              schema: 
                type: array
                items: 
                  type: string

Generation Details

java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g cpp-pistache-server -o out_temp2 -i ./sample.yaml

Steps to reproduce

Clone and build latest master
Generate any cpp-pistache-server
Run cmake build

Related issues/PRs

N/A

Suggest a fix

N/A