r-rmariadb: add mariadb library path (#21406)

var/spack/repos/builtin/packages/r-rmariadb/configure_add_rpath.patch

@@ -0,0 +1,13 @@
+diff --git a/configure b/configure
+index 6c0f43c..bd7f627 100755
+--- a/configure
++++ b/configure
+@@ -29,7 +29,7 @@ fi
+ if [ "$INCLUDE_DIR" ] || [ "$LIB_DIR" ]; then
+   echo "Found INCLUDE_DIR and/or LIB_DIR!"
+   PKG_CFLAGS="-I$INCLUDE_DIR $PKG_CFLAGS"
+-  PKG_LIBS="-L$LIB_DIR $PKG_LIBS"
++  PKG_LIBS="-L$LIB_DIR -Wl,-rpath,$LIB_DIR $PKG_LIBS"
+ elif [ "$PKGCONFIG_CFLAGS" ] || [ "$PKGCONFIG_LIBS" ]; then
+   echo "Found mysql_config/mariadb_config cflags and libs!"
+   PKG_CFLAGS=${PKGCONFIG_CFLAGS}

var/spack/repos/builtin/packages/r-rmariadb/package.py

@@ -29,3 +29,12 @@ class RRmariadb(RPackage):
     depends_on('r-bh', type=('build', 'run'))
     depends_on('r-plogr', type=('build', 'run'))
     depends_on('mariadb-client')
+
+    patch('configure_add_rpath.patch')
+
+    def configure_vars(self):
+        lib_dir = self.spec['mariadb-client'].prefix.lib.mariadb
+        inc_dir = self.spec['mariadb-client'].prefix.include.mariadb
+        args = ['LIB_DIR={0}'.format(lib_dir),
+                'INCLUDE_DIR={0}'.format(inc_dir)]
+        return args