diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -976,6 +976,10 @@
   for (const auto &II : Inputs)
     CmdArgs.push_back(II.getFilename());
 
+  if (Arg *A = Args.getLastArg(options::OPT_g_Flag, options::OPT_gN_Group))
+    if (!A->getOption().matches(options::OPT_g0))
+      Args.AddLastArg(CmdArgs, options::OPT_g_Flag);
+
   const char *Exec =
       Args.MakeArgString(getToolChain().GetProgramPath(DefaultAssembler));
   C.addCommand(std::make_unique<Command>(JA, *this,
diff --git a/clang/test/Driver/as-options.s b/clang/test/Driver/as-options.s
--- a/clang/test/Driver/as-options.s
+++ b/clang/test/Driver/as-options.s
@@ -116,3 +116,13 @@
 // RUN: %clang -mrelax-all -fno-integrated-as -x c++ %s -S -o /dev/null 2>&1 \
 // RUN:   | FileCheck --check-prefix=WARN --allow-empty %s
 // WARN: unused
+
+// Test that -g is passed through to GAS.
+// RUN: %clang --target=aarch64-linux-gnu -fno-integrated-as -g %s -### 2>&1 | \
+// RUN:   FileCheck --check-prefix=DEBUG %s
+// RUN: %clang --target=aarch64-linux-gnu -fno-integrated-as -g0 -g %s -### 2>&1 | \
+// RUN:   FileCheck --check-prefix=DEBUG %s
+// DEBUG: "-g"
+// RUN: %clang --target=aarch64-linux-gnu -fno-integrated-as -g -g0 %s -### 2>&1 | \
+// RUN:   FileCheck --check-prefix=NODEBUG %s
+// NODEBUG-NOT: "-g"