Build system: add option for MSVC incremental linking.

(cherry picked from commit bbafe14970cf2a101b8b04dbfafeeaa9ddfb5d4d)

methods.py

@@ -926,6 +926,9 @@ def generate_vs_project(env, num_jobs):
                 if env["custom_modules"]:
                     common_build_postfix.append("custom_modules=%s" % env["custom_modules"])
 
+                if env["incremental_link"]:
+                    common_build_postfix.append("incremental_link=yes")
+
                 result = " ^& ".join(common_build_prefix + [" ".join([commands] + common_build_postfix)])
                 return result
 

platform/windows/detect.py

@@ -72,6 +72,7 @@ def get_opts():
         BoolVariable("use_llvm", "Use the LLVM compiler", False),
         BoolVariable("use_static_cpp", "Link MinGW/MSVC C++ runtime libraries statically", True),
         BoolVariable("use_asan", "Use address sanitizer (ASAN)", False),
+        BoolVariable("incremental_link", "Use MSVC incremental linking. May increase or decrease build times.", False),
     ]
 
 
@@ -214,8 +215,9 @@ def configure_msvc(env, manual_msvc_config):
     else:
         env.AppendUnique(CCFLAGS=["/MD"])
 
-    # MSVC incremental linking is broken and _increases_ link time (GH-77968).
-    env.Append(LINKFLAGS=["/INCREMENTAL:NO"])
+    # MSVC incremental linking is broken and may _increase_ link time (GH-77968).
+    if not env["incremental_link"]:
+        env.Append(LINKFLAGS=["/INCREMENTAL:NO"])
 
     env.AppendUnique(CCFLAGS=["/Gd", "/GR", "/nologo"])
     env.AppendUnique(CCFLAGS=["/utf-8"])  # Force to use Unicode encoding.