Ensure we error on lto with link.exe on non-cl mode driver

Author: MaxEW707

clang/lib/Driver/Driver.cpp

@@ -4022,7 +4022,8 @@ void Driver::handleArguments(Compilation &C, DerivedArgList &Args,
     // Emitting LLVM while linking disabled except in HIPAMD Toolchain
     if (Args.hasArg(options::OPT_emit_llvm) && !Args.hasArg(options::OPT_hip_link))
       Diag(clang::diag::err_drv_emit_llvm_link);
-    if (IsCLMode() && LTOMode != LTOK_None &&
+    if (C.getDefaultToolChain().getTriple().isWindowsMSVCEnvironment() &&
+        LTOMode != LTOK_None &&
         !Args.getLastArgValue(options::OPT_fuse_ld_EQ)
              .equals_insensitive("lld"))
       Diag(clang::diag::err_drv_lto_without_lld);

clang/test/Driver/cl-options.c

@@ -626,6 +626,8 @@
 // LTO-THIN: -flto=thin
 
 // RUN: not %clang_cl -### -Fe%t.exe -entry:main -flto -- %s 2>&1 | FileCheck -check-prefix=LTO-WITHOUT-LLD %s
+// RUN: not %clang_cl -### -fuse-ld=link -Fe%t.exe -entry:main -flto -- %s 2>&1 | FileCheck -check-prefix=LTO-WITHOUT-LLD %s
+// RUN: not %clang -### --target=x86_64-windows-msvc -fuse-ld=link -Fe%t.exe -entry:main -flto -- %s 2>&1 | FileCheck -check-prefix=LTO-WITHOUT-LLD %s
 // LTO-WITHOUT-LLD: LTO requires -fuse-ld=lld
 
 // RUN: %clang_cl  -### -- %s 2>&1 | FileCheck -check-prefix=NOCFGUARD %s

clang/test/Driver/clang_f_opts.c

@@ -605,7 +605,7 @@
 // RUN: %clang -### -S -fjmc -g -fno-jmc --target=x86_64-pc-windows-msvc %s 2>&1 | FileCheck -check-prefix=CHECK_NOJMC %s
 // RUN: %clang -### -S -fjmc -g --target=x86_64-unknown-linux %s 2>&1 | FileCheck -check-prefix=CHECK_JMC %s
 // RUN: %clang -### -S -fjmc -g -fno-jmc --target=x86_64-unknown-linux %s 2>&1 | FileCheck -check-prefix=CHECK_NOJMC %s
-// RUN: %clang -### -fjmc -g -flto --target=x86_64-pc-windows-msvc %s 2>&1 | FileCheck -check-prefix=CHECK_NOJMC_LTO %s
+// RUN: %clang -### -fjmc -g -flto -fuse-ld=lld --target=x86_64-pc-windows-msvc %s 2>&1 | FileCheck -check-prefix=CHECK_NOJMC_LTO %s
 // RUN: %clang -### -fjmc -g -flto --target=x86_64-unknown-linux %s 2>&1 | FileCheck -check-prefix=CHECK_JMC_LTO %s
 // RUN: %clang -### -fjmc -g -flto -fno-jmc --target=x86_64-unknown-linux %s 2>&1 | FileCheck -check-prefix=CHECK_NOJMC_LTO %s
 // CHECK_JMC_WARN: -fjmc requires debug info. Use -g or debug options that enable debugger's stepping function; option ignored

clang/test/Driver/lto.c

@@ -5,7 +5,7 @@
 // CHECK-COMPILE-ACTIONS: 2: compiler, {1}, ir
 // CHECK-COMPILE-ACTIONS: 3: backend, {2}, lto-bc
 
-// RUN: %clang -ccc-print-phases %s -flto 2> %t
+// RUN: %clang -ccc-print-phases -fuse-ld=lld %s -flto 2> %t
 // RUN: FileCheck -check-prefix=CHECK-COMPILELINK-ACTIONS < %t %s
 //
 // CHECK-COMPILELINK-ACTIONS: 0: input, "{{.*}}lto.c", c

clang/test/Driver/thinlto.c

@@ -5,7 +5,7 @@
 // CHECK-COMPILE-ACTIONS: 2: compiler, {1}, ir
 // CHECK-COMPILE-ACTIONS: 3: backend, {2}, lto-bc
 
-// RUN: %clang -ccc-print-phases %s -flto=thin 2> %t
+// RUN: %clang -fuse-ld=lld -ccc-print-phases %s -flto=thin 2> %t
 // RUN: FileCheck -check-prefix=CHECK-COMPILELINK-ACTIONS < %t %s
 //
 // CHECK-COMPILELINK-ACTIONS: 0: input, "{{.*}}thinlto.c", c

clang/test/Driver/thinlto.cu

@@ -6,7 +6,7 @@
 // CHECK-COMPILE-ACTIONS-NOT: lto-bc
 // CHECK-COMPILE-ACTIONS: 12: backend, {11}, lto-bc, (host-cuda)
 
-// RUN: %clangxx -ccc-print-phases --no-offload-new-driver -nocudainc -nocudalib %s -flto=thin 2> %t
+// RUN: %clangxx -ccc-print-phases -fuse-ld=lld --no-offload-new-driver -nocudainc -nocudalib %s -flto=thin 2> %t
 // RUN: FileCheck -check-prefix=CHECK-COMPILELINK-ACTIONS < %t %s
 //
 // CHECK-COMPILELINK-ACTIONS: 0: input, "{{.*}}thinlto.cu", cuda, (host-cuda)