Use gnu gold or clang lld linkers if available

Builds/CMake/CMakeFuncs.cmake

@@ -509,6 +509,15 @@ macro(setup_build_boilerplate)
 
   if (is_gcc)
     add_compile_options(-Wno-unused-but-set-variable -Wno-deprecated)
+
+    # use gold linker if available
+    execute_process(
+      COMMAND ${CMAKE_CXX_COMPILER} -fuse-ld=gold -Wl,--version
+      ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
+    if ("${LD_VERSION}" MATCHES "GNU gold")
+      append_flags(CMAKE_EXE_LINKER_FLAGS -fuse-ld=gold)
+    endif ()
+    unset(LD_VERSION)
   endif()
 
   # Generator expressions are not supported in add_definitions, use set_property instead
@@ -551,6 +560,15 @@ macro(setup_build_boilerplate)
       add_compile_options(
         -Wno-redeclared-class-member -Wno-mismatched-tags -Wno-deprecated-register)
       add_definitions(-DBOOST_ASIO_HAS_STD_ARRAY)
+
+      # use ldd linker if available
+      execute_process(
+        COMMAND ${CMAKE_CXX_COMPILER} -fuse-ld=lld -Wl,--version
+        ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
+      if ("${LD_VERSION}" MATCHES "LLD")
+        append_flags(CMAKE_EXE_LINKER_FLAGS -fuse-ld=lld)
+      endif ()
+      unset(LD_VERSION)
     endif()
 
     if (APPLE)

SConstruct

@@ -552,6 +552,13 @@ def config_env(toolchain, variant, env):
         if toolchain == 'clang':
             env.Append(CCFLAGS=['-Wno-redeclared-class-member'])
             env.Append(CPPDEFINES=['BOOST_ASIO_HAS_STD_ARRAY'])
+            try:
+                ldd_ver = subprocess.check_output([env['CLANG_CXX'], '-fuse-ld=lld', '-Wl,--version'],
+                                            stderr=subprocess.STDOUT).strip()
+                # have lld
+                env.Append(LINKFLAGS=['-fuse-ld=lld'])
+            except:
+                pass
 
         env.Append(CXXFLAGS=[
             '-frtti',
@@ -583,11 +590,17 @@ def config_env(toolchain, variant, env):
                     '-D_GLIBCXX_USE_CXX11_ABI' : 0
                 })
             if toolchain == 'gcc':
-
                 env.Append(CCFLAGS=[
                     '-Wno-unused-but-set-variable',
                     '-Wno-deprecated',
                     ])
+                try:
+                    ldd_ver = subprocess.check_output([env['GNU_CXX'], '-fuse-ld=gold', '-Wl,--version'],
+                                                      stderr=subprocess.STDOUT).strip()
+                    # have ld.gold
+                    env.Append(LINKFLAGS=['-fuse-ld=gold'])
+                except:
+                    pass
 
         boost_libs = [
             # resist the temptation to alphabetize these. coroutine

src/ripple/app/paths/impl/PaySteps.cpp

@@ -498,9 +498,6 @@ isDirectXrpToXrp<XRPAmount, XRPAmount> (Strand const& strand)
     return (strand.size () == 2);
 }
 
-template
-bool
-isDirectXrpToXrp<XRPAmount, XRPAmount> (Strand const& strand);
 template
 bool
 isDirectXrpToXrp<XRPAmount, IOUAmount> (Strand const& strand);