[Driver][SYCL] Update option for undefined symbols for hostdep link (#8947)

When performing the host link for dependencies, we added '-z undefs' to
the link command line. This is fine for the bfd linker, but the option
is not supported for gold. Update the option used to use the common
--unresolved-symbols=ignore-all instead.

Author: mdtoguchi

clang/lib/Driver/ToolChains/Gnu.cpp

@@ -595,10 +595,8 @@ void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
 
   // Performing link for dependency file information, undefined symbols are OK.
   // True link time errors for symbols will be captured at host link.
-  if (JA.getType() == types::TY_Host_Dependencies_Image) {
-    CmdArgs.push_back("-z");
-    CmdArgs.push_back("undefs");
-  }
+  if (JA.getType() == types::TY_Host_Dependencies_Image)
+    CmdArgs.push_back("--unresolved-symbols=ignore-all");
 
   Args.AddAllArgs(CmdArgs, options::OPT_L);
   Args.AddAllArgs(CmdArgs, options::OPT_u);

clang/test/Driver/sycl-offload-intelfpga-link.cpp

@@ -110,7 +110,7 @@
 // RUN:          -target x86_64-unknown-linux-gnu %S/Inputs/SYCL/liblin64.a \
 // RUN:          %s -### 2>&1 \
 // RUN:  | FileCheck %s --check-prefix=CHK-FPGA-LINK-UNDEFS
-// CHK-FPGA-LINK-UNDEFS: ld{{.*}} "-z" "undefs"
+// CHK-FPGA-LINK-UNDEFS: ld{{.*}} "--unresolved-symbols=ignore-all"
 // CHK-FPGA-LINK-UNDEFS: clang-offload-deps{{.*}}
 
 /// -fintelfpga -fsycl-link from source

clang/test/Driver/sycl-offload-static-lib-2.cpp

@@ -150,7 +150,7 @@
 // RUN: %clangxx -target x86_64-unknown-linux-gnu -fsycl -fsycl-targets=nvptx64-nvidia-cuda %t_lib.a -o output_name -lOpenCL -### %s 2>&1 \
 // RUN:   | FileCheck %s -check-prefix=STATIC_LIB_SRC2 -DBUNDLE_TRIPLE=sycl-nvptx64-nvidia-cuda-sm_50 -DDEPS_TRIPLE=sycl-nvptx64-nvidia-cuda-sm_50
 // STATIC_LIB_SRC2: clang{{.*}} "-emit-obj" {{.*}} "-o" "[[HOSTOBJ:.+\.o]]"
-// STATIC_LIB_SRC2: ld{{(.exe)?}}" {{.*}} "-o" "[[HOSTEXE:.+\.out]]" {{.*}}"-z" "undefs"
+// STATIC_LIB_SRC2: ld{{(.exe)?}}" {{.*}} "-o" "[[HOSTEXE:.+\.out]]" {{.*}}"--unresolved-symbols=ignore-all"
 // STATIC_LIB_SRC2: clang-offload-deps{{.*}} "-targets=[[DEPS_TRIPLE]]" "-outputs=[[OUTDEPS:.+\.bc]]" "[[HOSTEXE]]"
 // STATIC_LIB_SRC2_DEF: clang-offload-bundler{{.*}} "-type=aoo" "-targets=[[BUNDLE_TRIPLE]]" {{.*}} "-output=[[OUTLIB:.+\.txt]]"
 // STATIC_LIB_SRC2_NVPTX: clang-offload-bundler{{.*}} "-type=a" "-targets=[[BUNDLE_TRIPLE]]" {{.*}} "-output=[[OUTLIB:.+\.a]]"