Add Windows Subsystem build option.

platform/windows/detect.py

@@ -65,6 +65,7 @@ def get_opts():
         # Vista support dropped after EOL due to GH-10243
         ("target_win_version", "Targeted Windows version, >= 0x0601 (Windows 7)", "0x0601"),
         EnumVariable("debug_symbols", "Add debugging symbols to release builds", "yes", ("yes", "no", "full")),
+        EnumVariable("windows_subsystem", "Windows subsystem", "gui", ("console", "gui")),
         BoolVariable("separate_debug_symbols", "Create a separate file containing debugging symbols", False),
         ("msvc_version", "MSVC version to use. Ignored if VCINSTALLDIR is set in shell env.", None),
         BoolVariable("use_mingw", "Use the Mingw compiler, even if MSVC is installed. Only used on Windows.", False),
@@ -177,13 +178,14 @@ def configure_msvc(env, manual_msvc_config):
     """Configure env to work with MSVC"""
 
     # Build type
+    if env["tests"]:
+        env["windows_subsystem"] = "console"
 
     if env["target"] == "release":
         if env["optimize"] == "speed":  # optimize for speed (default)
             env.Append(CCFLAGS=["/O2"])
         else:  # optimize for size
             env.Append(CCFLAGS=["/O1"])
-        env.Append(LINKFLAGS=["/SUBSYSTEM:WINDOWS"])
         env.Append(LINKFLAGS=["/ENTRY:mainCRTStartup"])
         env.Append(LINKFLAGS=["/OPT:REF"])
 
@@ -193,19 +195,22 @@ def configure_msvc(env, manual_msvc_config):
         else:  # optimize for size
             env.Append(CCFLAGS=["/O1"])
         env.AppendUnique(CPPDEFINES=["DEBUG_ENABLED"])
-        env.Append(LINKFLAGS=["/SUBSYSTEM:CONSOLE"])
         env.Append(LINKFLAGS=["/OPT:REF"])
 
     elif env["target"] == "debug":
         env.AppendUnique(CCFLAGS=["/Z7", "/Od", "/EHsc"])
         env.AppendUnique(CPPDEFINES=["DEBUG_ENABLED"])
-        env.Append(LINKFLAGS=["/SUBSYSTEM:CONSOLE"])
         env.Append(LINKFLAGS=["/DEBUG"])
 
     if env["debug_symbols"] == "full" or env["debug_symbols"] == "yes":
         env.AppendUnique(CCFLAGS=["/Z7"])
         env.AppendUnique(LINKFLAGS=["/DEBUG"])
 
+    if env["windows_subsystem"] == "gui":
+        env.Append(LINKFLAGS=["/SUBSYSTEM:WINDOWS"])
+    else:
+        env.Append(LINKFLAGS=["/SUBSYSTEM:CONSOLE"])
+
     ## Compile/link flags
 
     env.AppendUnique(CCFLAGS=["/MT", "/Gd", "/GR", "/nologo"])
@@ -303,6 +308,9 @@ def configure_mingw(env):
 
     ## Build type
 
+    if env["tests"]:
+        env["windows_subsystem"] = "console"
+
     if env["target"] == "release":
         env.Append(CCFLAGS=["-msse2"])
 
@@ -314,8 +322,6 @@ def configure_mingw(env):
         else:  # optimize for size
             env.Prepend(CCFLAGS=["-Os"])
 
-        env.Append(LINKFLAGS=["-Wl,--subsystem,windows"])
-
         if env["debug_symbols"] == "yes":
             env.Prepend(CCFLAGS=["-g1"])
         if env["debug_symbols"] == "full":
@@ -337,6 +343,11 @@ def configure_mingw(env):
         env.Append(CCFLAGS=["-g3"])
         env.Append(CPPDEFINES=["DEBUG_ENABLED"])
 
+    if env["windows_subsystem"] == "gui":
+        env.Append(LINKFLAGS=["-Wl,--subsystem,windows"])
+    else:
+        env.Append(LINKFLAGS=["-Wl,--subsystem,console"])
+
     ## Compiler configuration
 
     if os.name != "nt":