meson: de-duplicate binaries using symlinks

Use custom targets to create symlinks for testing.
meson will dereference these at install time, so use install_symlink().

meson.build

@@ -6,7 +6,7 @@ project('OpenRC', 'c',
     'prefix=/usr',
     'warning_level=3',
     ],
-  meson_version : '>=0.53.2')
+  meson_version : '>=0.61.0')
 
 cc = meson.get_compiler('c')
 fs = import('fs')

src/einfo/meson.build

@@ -1,6 +1,5 @@
 einfo_execs = [
   'einfon',
-  'einfo',
   'ewarnn',
   'ewarn',
   'eerrorn',
@@ -22,11 +21,19 @@ einfo_execs = [
   'veoutdent',
   ]
 
+executable('einfo',
+  ['einfo.c', version_h],
+  include_directories: [incdir, einfo_incdir, rc_incdir],
+  link_with: [libeinfo, librc],
+  install: true,
+  install_dir: rc_bindir)
+
 foreach exec: einfo_execs
-  executable(exec,
-    ['einfo.c', version_h],
-    include_directories: [incdir, einfo_incdir, rc_incdir],
-    link_with: [libeinfo, librc],
-    install: true,
-    install_dir: rc_bindir)
+  custom_target(exec,
+    build_by_default: true,
+    command: ['ln', '-fns', 'einfo', '@OUTPUT@'],
+    output: exec)
+  install_symlink(exec,
+    install_dir: rc_bindir,
+    pointing_to: 'einfo')
 endforeach

src/mark_service/meson.build

@@ -1,5 +1,4 @@
 mark_service_execs =	[
-  'mark_service_starting',
   'mark_service_started',
   'mark_service_stopping',
   'mark_service_stopped',
@@ -10,11 +9,19 @@ mark_service_execs =	[
   'mark_service_crashed',
   ]
 
+executable('mark_service_starting',
+  ['mark_service.c', misc_c, version_h],
+  include_directories: [incdir, einfo_incdir, rc_incdir],
+  link_with: [libeinfo,librc],
+  install: true,
+  install_dir: rc_sbindir)
+
 foreach exec : mark_service_execs
-  executable(exec,
-    ['mark_service.c', misc_c, version_h],
-    include_directories: [incdir, einfo_incdir, rc_incdir],
-    link_with: [libeinfo,librc],
-    install: true,
-    install_dir: rc_sbindir)
+  custom_target(exec,
+    build_by_default: true,
+    command: ['ln', '-fns', 'mark_service_starting', '@OUTPUT@'],
+    output: exec)
+  install_symlink(exec,
+    install_dir: rc_sbindir,
+    pointing_to: 'mark_service_starting')
 endforeach

src/service/meson.build

@@ -1,5 +1,4 @@
 service_execs = [
-  'service_starting',
   'service_started',
   'service_stopping',
   'service_stopped',
@@ -10,11 +9,19 @@ service_execs = [
   'service_crashed',
   ]
 
+executable('service_starting',
+  ['service.c', misc_c, version_h],
+  include_directories: [incdir, einfo_incdir, rc_incdir],
+  link_with: [libeinfo, librc],
+  install: true,
+  install_dir: rc_bindir)
+
 foreach exec : service_execs
-  executable(exec,
-    ['service.c', misc_c, version_h],
-    include_directories: [incdir, einfo_incdir, rc_incdir],
-    link_with: [libeinfo, librc],
-    install: true,
-    install_dir: rc_bindir)
+  custom_target(exec,
+    build_by_default: true,
+    command: ['ln', '-fns', 'service_starting', '@OUTPUT@'],
+    output: exec)
+  install_symlink(exec,
+    install_dir: rc_bindir,
+    pointing_to: 'service_starting')
 endforeach

src/value/meson.build

@@ -1,15 +1,22 @@
 value_execs = [
-  'service_get_value',
   'service_set_value',
   'get_options',
   'save_options',
   ]
 
+executable('service_get_value',
+  ['value.c', misc_c, version_h],
+  include_directories: [incdir, einfo_incdir, rc_incdir],
+  link_with: [libeinfo, librc],
+  install: true,
+  install_dir: rc_bindir)
+
 foreach exec : value_execs
-  executable(exec,
-    ['value.c', misc_c, version_h],
-    include_directories: [incdir, einfo_incdir, rc_incdir],
-    link_with: [libeinfo, librc],
-    install: true,
-    install_dir: rc_bindir)
+  custom_target(exec,
+    build_by_default: true,
+    command: ['ln', '-fns', 'service_get_value', '@OUTPUT@'],
+    output: exec)
+  install_symlink(exec,
+    install_dir: rc_bindir,
+    pointing_to: 'service_get_value')
 endforeach