feat: update install_dirs to derive mandir and infodir from datarootdir

src/builder/meson.rs

@@ -176,7 +176,6 @@ fn meson_setup_args(
         ("--localstatedir", dirs.localstatedir),
         ("--sharedstatedir", dirs.sharedstatedir),
         ("--includedir", dirs.includedir),
-        ("--datarootdir", dirs.datarootdir),
         ("--datadir", dirs.datadir),
         ("--mandir", dirs.mandir),
         ("--infodir", dirs.infodir),
@@ -305,12 +304,25 @@ mod tests {
         assert!(args.iter().any(|a| a == "--localstatedir=/var"));
         assert!(args.iter().any(|a| a == "--sharedstatedir=/var/lib"));
         assert!(args.iter().any(|a| a == "--includedir=/usr/include"));
-        assert!(args.iter().any(|a| a == "--datarootdir=/usr/share"));
         assert!(args.iter().any(|a| a == "--datadir=/usr/share"));
         assert!(args.iter().any(|a| a == "--mandir=/usr/share/man"));
         assert!(args.iter().any(|a| a == "--infodir=/usr/share/info"));
     }
 
+    #[test]
+    fn test_meson_setup_args_derive_dirs_from_datarootdir() {
+        let flags = BuildFlags {
+            datarootdir: "/opt/share-root".to_string(),
+            ..BuildFlags::default()
+        };
+
+        let args = meson_setup_args(&flags, None, &[]);
+        assert!(!args.iter().any(|a| a.starts_with("--datarootdir=")));
+        assert!(args.iter().any(|a| a == "--datadir=/opt/share-root"));
+        assert!(args.iter().any(|a| a == "--mandir=/opt/share-root/man"));
+        assert!(args.iter().any(|a| a == "--infodir=/opt/share-root/info"));
+    }
+
     #[test]
     fn test_meson_setup_args_honor_explicit_prefix() {
         let flags = BuildFlags {

src/builder/mod.rs

@@ -68,6 +68,8 @@ pub(crate) fn install_dirs(flags: &crate::package::BuildFlags) -> InstallDirs {
         default_libdir_for_variant(flags.lib32_variant),
     );
     let datarootdir = configured_install_dir(&flags.datarootdir, "/usr/share");
+    let default_mandir = format!("{datarootdir}/man");
+    let default_infodir = format!("{datarootdir}/info");
 
     InstallDirs {
         bindir: configured_install_dir(&flags.bindir, "/usr/bin"),
@@ -80,8 +82,8 @@ pub(crate) fn install_dirs(flags: &crate::package::BuildFlags) -> InstallDirs {
         includedir: configured_install_dir(&flags.includedir, "/usr/include"),
         datarootdir: datarootdir.clone(),
         datadir: configured_install_dir(&flags.datadir, &datarootdir),
-        mandir: configured_install_dir(&flags.mandir, "/usr/share/man"),
+        mandir: configured_install_dir(&flags.mandir, &default_mandir),
-        infodir: configured_install_dir(&flags.infodir, "/usr/share/info"),
+        infodir: configured_install_dir(&flags.infodir, &default_infodir),
     }
 }