[RISCV] Pass -u to linker correctly.

`-u` is a linker option used to pretend a symbol is undefined,
this option are common used for forcing archive member extraction.

This option should pass to `ld`, and many other toolchain in Clang
like `tools::gnutools` has pass that too.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D105091

diff --git a/clang/lib/Driver/ToolChains/RISCVToolchain.cpp b/clang/lib/Driver/ToolChains/RISCVToolchain.cpp
index 0b8c520..075c1dc 100644 (file)
--- a/clang/lib/Driver/ToolChains/RISCVToolchain.cpp
+++ b/clang/lib/Driver/ToolChains/RISCVToolchain.cpp
@@ -184,6 +184,7 @@ void RISCV::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
 
   Args.AddAllArgs(CmdArgs, options::OPT_L);
+  Args.AddAllArgs(CmdArgs, options::OPT_u);
   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
   Args.AddAllArgs(CmdArgs,
                   {options::OPT_T_Group, options::OPT_e, options::OPT_s,

diff --git a/clang/test/Driver/riscv-args.c b/clang/test/Driver/riscv-args.c
index 7b68df9..305a508 100644 (file)
--- a/clang/test/Driver/riscv-args.c
+++ b/clang/test/Driver/riscv-args.c
@@ -1,7 +1,6 @@
 // Check the arguments are correctly passed
 
 // Make sure -T is the last with gcc-toolchain option
-// RUN: %clang -### -target riscv32 \
-// RUN:   --gcc-toolchain= -Xlinker --defsym=FOO=10 -T a.lds %s 2>&1 \
+// RUN: %clang -### -target riscv32 --gcc-toolchain= -Xlinker --defsym=FOO=10 -T a.lds -u foo %s 2>&1 \
 // RUN:   | FileCheck -check-prefix=CHECK-LD %s
-// CHECK-LD: {{.*}} "--defsym=FOO=10" {{.*}} "-T" "a.lds"
+// CHECK-LD: {{.*}} "--defsym=FOO=10" {{.*}} "-u" "foo" {{.*}} "-T" "a.lds"