gcc fix

sys/devel/gcc/ympbuild

@@ -32,7 +32,6 @@ prepare(){
 setup(){
     options=(
       --prefix=/usr
-      --libdir=/usr/lib64
       --libexecdir=/usr/libexec
       --mandir=/usr/share/man
       --infodir=/usr/share/info
@@ -44,24 +43,44 @@ setup(){
       --enable-plugin
       --enable-lto
       --enable-languages=c,c++$(use_opt langs ",fortran,go,objc,obj-c++" "")
-      $(use_opt multilib "--enable-multilib" "")
-      $(use_opt multilib "--enable-multiarch" "")
       --enable-shared
       --without-zstd
       --with-system-zlib
       --disable-nls
     )
+    if use multilib ; then
+        mkdir build-lib32
+        cd build-lib32
+        ../configure ${options[@]} \
+            --libdir=/usr/lib32 \
+            --target=i686-pc-linux-gnu
+        cd ..
+    fi
     mkdir build
     cd build
-    ../configure ${options[@]}
+    ../configure ${options[@]} \
+        --libdir=/usr/lib64 \
+        --target=x86_64-pc-linux-gnu \
+        $(use_opt multilib "--enable-multilib" "") \
+        $(use_opt multilib "--with-multilib-list=m32,m64" "")
 }
 
 build(){
+    if use multilib ; then
+        cd build-lib32
+        make -j`nproc`
+        cd ..
+    fi
     cd build
     make -j`nproc`
 }
 
 package(){
+    if use multilib ; then
+        cd build-lib32
+        make install -j`nproc`
+        cd ..
+    fi
     cd build
     make install -j`nproc`
     mkdir -p ${DESTDIR}/usr/lib64/
@@ -71,5 +90,8 @@ package(){
             mv ${DESTDIR}/usr/{lib,lib32}
         fi
     fi
+    ln -s gcc ${DESTDIR}/usr/bin/cc
+    ln -s g++ ${DESTDIR}/usr/bin/cxx
+    ln -s ../usr/bin/cpp ${DESTDIR}/lib64/cpp
 }