Support -fuse-ld=lld for riscv

Add a configure feature test to filter out tests that explicitly depend on platform linker.

Differential Revision: https://reviews.llvm.org/D74704

Author: serge-sans-paille

clang/lib/Driver/ToolChains/RISCVToolchain.cpp

@@ -142,7 +142,7 @@ void RISCV::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("elf32lriscv");
   }
 
-  std::string Linker = getToolChain().GetProgramPath(getShortName());
+  std::string Linker = getToolChain().GetLinkerPath();
 
   bool WantCRTs =
       !Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles);

clang/test/Driver/riscv32-toolchain.c

@@ -1,8 +1,13 @@
 // A basic clang -cc1 command-line, and simple environment check.
+// REQUIRES: platform-linker
 
 // RUN: %clang %s -### -no-canonical-prefixes -target riscv32 2>&1 | FileCheck -check-prefix=CC1 %s
 // CC1: clang{{.*}} "-cc1" "-triple" "riscv32"
 
+// Test interaction with -fuse-ld=lld, if lld is available.
+// RUN: %clang %s -### -no-canonical-prefixes -target riscv32 -fuse-ld=lld 2>&1 | FileCheck -check-prefix=LLD %s
+// LLD: {{(error: invalid linker name in argument '-fuse-ld=lld')|(ld.lld)}}
+
 // In the below tests, --rtlib=platform is used so that the driver ignores
 // the configure-time CLANG_DEFAULT_RTLIB option when choosing the runtime lib
 

clang/test/Driver/riscv64-toolchain.c

@@ -1,8 +1,13 @@
 // A basic clang -cc1 command-line, and simple environment check.
+// REQUIRES: platform-linker
 
 // RUN: %clang %s -### -no-canonical-prefixes -target riscv64 2>&1 | FileCheck -check-prefix=CC1 %s
 // CC1: clang{{.*}} "-cc1" "-triple" "riscv64"
 
+// Test interaction with -fuse-ld=lld, if lld is available.
+// RUN: %clang %s -### -no-canonical-prefixes -target riscv32 -fuse-ld=lld 2>&1 | FileCheck -check-prefix=LLD %s
+// LLD: {{(error: invalid linker name in argument '-fuse-ld=lld')|(ld.lld)}}
+
 // In the below tests, --rtlib=platform is used so that the driver ignores
 // the configure-time CLANG_DEFAULT_RTLIB option when choosing the runtime lib
 

clang/test/lit.site.cfg.py.in

@@ -46,5 +46,8 @@ except KeyError:
 import lit.llvm
 lit.llvm.initialize(lit_config, config)
 
+if not "@CLANG_DEFAULT_LINKER@":
+    config.available_features('platform-linker')
+
 # Let the main config do the real work.
 lit_config.load_config(config, "@CLANG_SOURCE_DIR@/test/lit.cfg.py")