Enable cxx11 abi for GCC 4.9+ on linux.

GCC version is checked, if version is 4.8 or lower then cxx11 ABI is disabled. Added new `--no-cxx11-abi` option. It explicitly disables cxx11 ABI even on new compilers. This option is also taken into account when building LLVM.

Author: rokups

build/Helpers.lua

@@ -9,6 +9,11 @@ newoption {
    }
 }
 
+newoption {
+   trigger     = "no-cxx11-abi",
+   description = "disable cxx11 abi on gcc 4.9+"
+}
+
 explicit_target_architecture = _OPTIONS["arch"]
 
 function is_64_bits_mono_runtime()
@@ -95,6 +100,12 @@ function SetupNativeProject()
     defines { "WIN32", "_WINDOWS" }
 
   filter {}
+
+  if os.istarget("linux") then
+    if not UseCxx11ABI() then
+      defines { "_GLIBCXX_USE_CXX11_ABI=0" }
+    end
+  end
 end
 
 function SetupManagedProject()
@@ -164,3 +175,20 @@ function StaticLinksOpt(libnames)
 
   links(existing_libnames)
 end
+
+function GccVersion()
+  local compiler = os.getenv("CXX")
+  if compiler == nil then
+    compiler = "gcc"
+  end
+  local out = os.outputof(compiler.." -v")
+  local version = string.match(out, "gcc version [0-9\\.]+")
+  return string.sub(version, 13)
+end
+
+function UseCxx11ABI()
+  if os.istarget("linux") and GccVersion() >= '4.9.0' and _OPTIONS["no-cxx11-abi"] == nil then
+    return true
+  end
+  return false
+end

build/scripts/LLVM.lua

@@ -181,6 +181,14 @@ function cmake(gen, conf, builddir, options)
 	os.chdir(builddir)
 	local cmake = os.ishost("macosx") and "/Applications/CMake.app/Contents/bin/cmake"
 		or "cmake"
+
+	if options == nil then
+		options = ""
+	end
+	if os.istarget("linux") and _OPTIONS["no-cxx11-abi"] ~= nil then
+		options = options.." -DCMAKE_CXX_FLAGS='-D_GLIBCXX_USE_CXX11_ABI=0'"
+	end
+
 	local cmd = cmake .. " -G " .. '"' .. gen .. '"'
  		.. ' -DLLVM_BUILD_TOOLS=false '
  		.. ' -DLLVM_ENABLE_LIBEDIT=false'

src/CppParser/Bindings/CSharp/premake5.lua

@@ -25,7 +25,11 @@ project "CppSharp.Parser.CSharp"
       end
 
   elseif os.istarget("linux") then
-      files { "x86_64-linux-gnu/**.cs" }
+      local abi = ""
+      if UseCxx11ABI() then
+          abi = "-cxx11abi"
+      end
+      files { "x86_64-linux-gnu"..abi.."/**.cs" }
   else
       print "Unknown architecture"
   end

src/CppParser/premake5.lua

@@ -22,9 +22,6 @@ project "CppSharp.CppParser"
     linkoptions { "/ignore:4099" } -- LNK4099: linking object as if no debug info
   end
 
-  filter "system:linux"
-    defines { "_GLIBCXX_USE_CXX11_ABI=0" }
-
   filter {}
 
   files
@@ -65,7 +62,11 @@ project "Std-symbols"
       end
 
   elseif os.istarget("linux") then
-      files { "Bindings/CSharp/x86_64-linux-gnu/Std-symbols.cpp" }
+      local abi = ""
+      if UseCxx11ABI() then
+          abi = "-cxx11abi"
+      end
+      files { "Bindings/CSharp/x86_64-linux-gnu"..abi.."/Std-symbols.cpp" }
   else
       print "Unknown architecture"
   end