[clang][hexagon] Handle library path arguments earlier

The removal of the early return in 96832a6
was an error: it would include the 'standalone' library that's not used
by linux.

Instead we reproduce the library path handling in the linux/musl block.

Differential Revision: https://reviews.llvm.org/D156771

Author: androm3da

clang/lib/Driver/ToolChains/Hexagon.cpp

@@ -383,6 +383,11 @@ constructHexagonLinkArgs(Compilation &C, const JobAction &JA,
       if (HTC.ShouldLinkCXXStdlib(Args))
         HTC.AddCXXStdlibLibArgs(Args, CmdArgs);
     }
+    const ToolChain::path_list &LibPaths = HTC.getFilePaths();
+    for (const auto &LibPath : LibPaths)
+      CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
+    Args.ClaimAllArgs(options::OPT_L);
+    return;
   }
 
   //----------------------------------------------------------------------------

clang/test/Driver/hexagon-toolchain-linux.c

@@ -120,8 +120,12 @@
 // CHECK009-SAME: {{^}} "-internal-isystem" "[[RESOURCE]]/include"
 // CHECK009-SAME: {{^}} "-internal-externc-isystem" "[[INSTALLED_DIR]]/../target/hexagon/include"
 
-// RUN: %clang -fdriver-only -Werror -v -L/tmp \
-// RUN:    --target=hexagon-unknown-linux-musl %s 2>&1 \
+// RUN: %clang -Werror -L/tmp \
+// RUN:    --target=hexagon-unknown-linux-musl %s -### 2>&1 \
 // RUN:    | FileCheck -check-prefix=CHECK010 %s
 // CHECK010:   InstalledDir: [[INSTALLED_DIR:.+]]
+// CHECK010-NOT:  "-lstandalone"
+// CHECK010-NOT:  crt0_standalone.o
+// CHECK010:   crt1.o
 // CHECK010:   "-L/tmp"
+// CHECK010-NOT:  "-lstandalone"