build(vendor): vendor libraries now install in a dedicated directory

We now install vendor libraries into includedir/fourdst/vendor to avoid conflicts with user installed libraries. Note that currently this only applies to headers and not compiled shared libraries

BREAKING CHANGE:

build-config/CLI11/meson.build

@@ -1,2 +1,8 @@
 cli11_proj = subproject('cli11')
-cli11_dep = cli11_proj.get_variable('CLI11_dep')
+cli11_dep = cli11_proj.get_variable('CLI11_dep')
+
+install_subdir(
+    meson.project_source_root() / 'subprojects' / 'CLI11-2.6.1' / 'include',
+    install_dir: get_option('includedir') / 'fourdst' / 'vendor',
+    strip_directory: true
+)

build-config/reflect-cpp/meson.build

@@ -32,6 +32,6 @@ reflect_cpp_dep = declare_dependency(
 
 install_subdir(
     'include',
-    install_dir: get_option('includedir'),
+    install_dir: get_option('includedir') / 'fourdst' / 'vendor',
     strip_directory: true
 )

build-config/tomlpp/meson.build

@@ -2,6 +2,6 @@ tomlpp_dep = dependency('tomlplusplus', required: true, static: true).as_system(
 
 install_subdir(
     meson.project_source_root() / 'subprojects' / 'tomlplusplus-3.4.0' / 'include',
-    install_dir: get_option('includedir'),
+    install_dir: get_option('includedir') / 'fourdst' / 'vendor',
     strip_directory: true
 )

meson.build

@@ -37,6 +37,9 @@ endif
 
 if get_option('pkg_config')
     message('Generating pkg-config file for libconfig...')
+
+    vendor_inc_flags = '-I${includedir}' / 'fourdst' / 'vendor'
+
     pkg = import('pkgconfig')
     pkg.generate(
         name: 'libconfig',
@@ -44,6 +47,7 @@ if get_option('pkg_config')
         version: meson.project_version(),
         libraries: [reflect_cpp_library],
         filebase: 'fourdst_config',
-        install_dir: join_paths(get_option('libdir'), 'pkgconfig')
+        install_dir: join_paths(get_option('libdir'), 'pkgconfig'),
+        extra_cflags: vendor_inc_flags
     )
 endif

src/config/meson.build

@@ -1,5 +1,8 @@
 config_dep = declare_dependency(
-    include_directories: include_directories('include'),
+    include_directories: [
+        include_directories('include'),
+        include_directories('include/fourdst/config'),
+    ],
     dependencies: [reflect_cpp_dep],
 )