Fix meson.build for header only install and add *.pc gen.

    This project compiled by meson used to produce an empty .a file.
    This should not happen since lyra is pure header library.
    Now meson can correctly install these header files.
    Now lyra.pc file is automatically created by meson.

Co-authored-by: René Ferdinand Rivera Morell <[email protected]>

data/build.jam

@@ -100,15 +100,25 @@ $(lyra_headers_relative:J=$(meson_build_header_join_str))
 "
 ]
 
-inc_dir = [include_directories('include')]
-
-lyra_lib = shared_library('lyra',
-	sources : src,
-	include_directories: inc_dir,
-	install: true,
-	install_dir : '/usr/lib')
-
-lyra_dep = declare_dependency(include_directories: inc_dir, link_with: lyra_lib)
+fs = import('fs')
+foreach header : src
+	# use substring to drop `include/` prefix
+	install_headers(header, subdir : fs.parent(header.substring(8)))
+endforeach
+
+inc_dir = include_directories('include')
+
+lyra_dep = declare_dependency(include_directories: inc_dir)
+
+pkg = import('pkgconfig')
+pkg.generate(
+	subdirs : 'lyra',
+	filebase : 'lyra',
+	version : meson.project_version(),
+	name : meson.project_name(),
+	description : 'A simple to use, composing, header only, command line arguments parser for C++ 11 and beyond.',
+	url: 'https://github.com/bfgroup/Lyra',
+)
 " ;
 
 .meson_build_file = $(.meson_build_file:J=) ;

meson.build

@@ -68,12 +68,22 @@ src = [
 	'include/lyra/version.hpp'
 ]
 
-inc_dir = [include_directories('include')]
+fs = import('fs')
+foreach header : src
+	# use substring to drop `include/` prefix
+	install_headers(header, subdir : fs.parent(header.substring(8)))
+endforeach
 
-lyra_lib = shared_library('lyra',
-	sources : src,
-	include_directories: inc_dir,
-	install: true,
-	install_dir : '/usr/lib')
+inc_dir = include_directories('include')
 
-lyra_dep = declare_dependency(include_directories: inc_dir, link_with: lyra_lib)
+lyra_dep = declare_dependency(include_directories: inc_dir)
+
+pkg = import('pkgconfig')
+pkg.generate(
+	subdirs : 'lyra',
+	filebase : 'lyra',
+	version : meson.project_version(),
+	name : meson.project_name(),
+	description : 'A simple to use, composing, header only, command line arguments parser for C++ 11 and beyond.',
+	url: 'https://github.com/bfgroup/Lyra',
+)