gentoo-overlay/dev-lang/rust/files/rust-9999-libdir.patch

This patch adds proper support for --libdir configure option
See https://github.com/rust-lang/rust/issues/11671 and
https://github.com/rust-lang/rust/pull/16552

diff --git a/configure b/configure
index 636d502..fff67b6 100755
--- a/configure
+++ b/configure
@@ -459,6 +459,14 @@ fi
 
 valopt libdir "${CFG_PREFIX}/${CFG_LIBDIR_RELATIVE}" "install libraries"
 
+case "$CFG_LIBDIR" in
+    "$CFG_PREFIX"/*) CAT_INC=2;;
+    "$CFG_PREFIX"*)  CAT_INC=1;;
+    *)
+        err "libdir must begin with the prefix. Use --prefix to set it accordingly.";;
+esac
+CFG_LIBDIR_RELATIVE=`echo ${CFG_LIBDIR} | cut -c$((${#CFG_PREFIX}+${CAT_INC}))-`
+
 if [ $HELP -eq 1 ]
 then
     echo
@@ -855,6 +863,15 @@ for h in $CFG_HOST
 do
     for t in $CFG_TARGET
     do
+        # host lib dir stage0
+        make_dir $h/stage0/lib
+
+        # target bin dir stage0
+        make_dir $h/stage0/lib/rustlib/$t/bin
+
+        # target lib dir stage0
+        make_dir $h/stage0/lib/rustlib/$t/lib
+
         for i in 0 1 2 3
         do
             # host bin dir
diff --git a/mk/main.mk b/mk/main.mk
index 2bdfc1b..bca5b3b 100644
--- a/mk/main.mk
+++ b/mk/main.mk
@@ -311,7 +311,11 @@ define SREQ
 # Destinations of artifacts for the host compiler
 HROOT$(1)_H_$(3) = $(3)/stage$(1)
 HBIN$(1)_H_$(3) = $$(HROOT$(1)_H_$(3))/bin
+ifeq ($(1),0)
+HLIB$(1)_H_$(3) = $$(HROOT$(1)_H_$(3))/lib
+else
 HLIB$(1)_H_$(3) = $$(HROOT$(1)_H_$(3))/$$(CFG_LIBDIR_RELATIVE)
+endif
 
 # Destinations of artifacts for target architectures
 TROOT$(1)_T_$(2)_H_$(3) = $$(HLIB$(1)_H_$(3))/rustlib/$(2)
diff --git a/src/etc/install.sh b/src/etc/install.sh
index c949743..1a472c6 100644
--- a/src/etc/install.sh
+++ b/src/etc/install.sh
@@ -301,9 +301,16 @@ fi
 flag uninstall "only uninstall from the installation prefix"
 opt verify 1 "verify that the installed binaries run correctly"
 valopt prefix "/usr/local" "set installation prefix"
-# NB This isn't quite the same definition as in `configure`.
-# just using 'lib' instead of CFG_LIBDIR_RELATIVE
+# NB This is exactly the same definition as in `configure`.
 valopt libdir "${CFG_PREFIX}/${CFG_LIBDIR_RELATIVE}" "install libraries"
+case "$CFG_LIBDIR" in
+    "$CFG_PREFIX"/*) CAT_INC=2;;
+    "$CFG_PREFIX"*)  CAT_INC=1;;
+    *)
+        err "libdir must begin with the prefix. Use --prefix to set it accordingly.";;
+esac
+CFG_LIBDIR_RELATIVE=`echo ${CFG_LIBDIR} | cut -c$((${#CFG_PREFIX}+${CAT_INC}))-`
+
 valopt mandir "${CFG_PREFIX}/share/man" "install man pages in PATH"
 
 if [ $HELP -eq 1 ]
@@ -428,9 +435,9 @@ while read p; do
     # Decide the destination of the file
     FILE_INSTALL_PATH="${CFG_PREFIX}/$p"
 
-    if echo "$p" | grep "^lib/" > /dev/null
+    if echo "$p" | grep "^${CFG_LIBDIR_RELATIVE}/" > /dev/null
     then
-        pp=`echo $p | sed 's/^lib\///'`
+        pp=`echo $p | sed "s%^${CFG_LIBDIR_RELATIVE}/%%"`
         FILE_INSTALL_PATH="${CFG_LIBDIR}/$pp"
     fi
 
diff --git a/src/librustc/metadata/filesearch.rs b/src/librustc/metadata/filesearch.rs
index 99b98b6..f3e37ff 100644
--- a/src/librustc/metadata/filesearch.rs
+++ b/src/librustc/metadata/filesearch.rs
@@ -243,10 +243,14 @@ fn find_libdir(sysroot: &Path) -> String {
     // of the directory where librustc is located, rather than where the rustc
     // binary is.
 
-    if sysroot.join(primary_libdir_name()).join(rustlibdir()).exists() {
-        return primary_libdir_name();
-    } else {
-        return secondary_libdir_name();
+    match option_env!("CFG_LIBDIR_RELATIVE") {
+        None => if sysroot.join(primary_libdir_name()).join(rustlibdir()).exists() {
+            return primary_libdir_name();
+        } else {
+            return secondary_libdir_name();
+        },
+
+        Some(libdir) => return libdir.to_string()
     }
 
     #[cfg(target_word_size = "64")]