Implement use_static_cpp flag for Linux

See godotengine/godot-cpp#1747

Author: Spartan322

tools/linux.py

@@ -6,6 +6,7 @@
 
 def options(opts):
     opts.Add(BoolVariable("use_llvm", "Use the LLVM compiler - only effective when targeting Linux", False))
+    opts.Add(BoolVariable("use_static_cpp", "Link libgcc and libstdc++ statically for better portability", True))
     opts.Add(BoolVariable("use_ubsan", "Use LLVM/GCC compiler undefined behavior sanitizer (UBSAN)", False))
     opts.Add(BoolVariable("use_asan", "Use LLVM/GCC compiler address sanitizer (ASAN)", False))
     opts.Add(BoolVariable("use_lsan", "Use LLVM/GCC compiler leak sanitizer (LSAN)", False))
@@ -43,6 +44,10 @@ def generate(env):
         env.Append(CCFLAGS=["-march=rv64gc"])
         env.Append(LINKFLAGS=["-march=rv64gc"])
 
+    # Link statically for portability
+    if env["use_static_cpp"]:
+        env.Append(LINKFLAGS=["-static-libgcc", "-static-libstdc++"])
+
     if env["use_ubsan"] or env["use_asan"] or env["use_lsan"] or env["use_tsan"] or env["use_msan"]:
         env.extra_suffix += ".san"
         env.Append(CCFLAGS=["-DSANITIZERS_ENABLED"])