build(meson): much more robust build system

build-extra/pkg-config/gridfire-wheel.pc.in

@@ -0,0 +1,9 @@
+prefix=${pcfiledir}/../..
+includedir=${prefix}/include
+libdir=${prefix}/lib
+
+Name: gridfire
+Description: GridFire nuclear reaction network solver (bundled with the gridfire Python wheel)
+Version: @VERSION@
+Cflags: -I${includedir} -I${includedir}/gridfire/vendor -I${includedir}/fourdst/vendor
+Libs: -L${libdir} -lgridfire -Wl,-rpath,${libdir}

build-extra/pkg-config/meson.build

@@ -1,22 +1,29 @@
-if get_option('pkg_config')
+if get_option('build_python')
+    message('Generating wheel-relocatable pkg-config file for GridFire...')
+    wheel_pc_conf = configuration_data()
+    wheel_pc_conf.set('VERSION', meson.project_version())
+    configure_file(
+        input: 'gridfire-wheel.pc.in',
+        output: 'gridfire.pc',
+        configuration: wheel_pc_conf,
+        install: true,
+        install_dir: gridfire_pcdir,
+    )
+elif get_option('pkg_config')
     message('Generating pkg-config file for GridFire...')
     pkg = import('pkgconfig')
     pkg.generate(
+        libgridfire,
         name: 'gridfire',
         description: 'GridFire nuclear reaction network solver',
-        version: meson.project_version(),
-        libraries: [
-            libgridfire,
-            libcomposition,
-            libconst,
-            liblogging,
-            libcppad_static,
-            libcvode_static,
-            libkinsol_static
-            
-        ],
-        subdirs: ['gridfire'],
         filebase: 'gridfire',
-        install_dir: join_paths(get_option('libdir'), 'pkgconfig')
+        subdirs: ['gridfire'],
+        requires: [
+            'fourdst_composition',
+            'fourdst_config',
+            'fourdst_constants',
+            'fourdst_logging',
+        ],
+        extra_cflags: ['-I${includedir}' / 'gridfire' / 'vendor'],
     )
 endif