linux: prevent hybrid-mode compiler warnings

repos/base-linux/lib/import/import-lx_hybrid.mk

@@ -109,3 +109,6 @@ LD_LIBGCC =
 
 # use the host c++ for linking to find shared libraries in DT_RPATH library paths
 LD_CMD = c++
+
+# disable format-string security checks, which prevent non-literal format strings
+CC_OPT += -Wno-format-security

repos/os/src/server/lx_fs/file.h

@@ -129,7 +129,7 @@ class File_system::File : public Node
 
 		void truncate(file_size_t size)
 		{
-			ftruncate(_fd, size);
+			if (ftruncate(_fd, size)) /* nothing */;
 
 			mark_as_updated();
 		}