tup: Custom CFLAGS/LDFLAGS, fix THREAD_MODULE config;

Tuprules.tup

@@ -15,7 +15,7 @@ CFLAGS += -Wno-typedef-redefinition
 CFLAGS += -Wno-unused-parameter
 
 # stdatomic.h is used for atomic refcounts when threads are enabled, and that's a C11 feature.
-ifeq (@(MODULE_THREAD),y)
+ifeq (@(THREAD),y)
   CFLAGS += -std=c11
 else
   CFLAGS += -std=c99
@@ -84,6 +84,9 @@ LDFLAGS += @(OPENVR_LDFLAGS)
 LDFLAGS += @(OPENXR_LDFLAGS)
 LDFLAGS += @(ENET_LDFLAGS)
 
+CFLAGS += @(CFLAGS)
+LDFLAGS += @(LDFLAGS)
+
 # Macros
 !compile = |> ^ CC %f^ @(CC) $(CFLAGS) $(CFLAGS_y) -c %f -o %o |> $(ROOT)/.obj/%B.o $(ROOT)/<objects>
 !link = |> ^ LD %o^ @(CC) $(LDFLAGS) -o %o |>

tup.config

@@ -41,8 +41,11 @@ CONFIG_GL=GL
 ## Compiler options
 # The CC option stands for "C Compiler".  Some common compilers are clang and gcc.
 # Debug builds compile faster and have debug symbols, but the executable is bigger and slower.
+# Also, extra compiler flags (CFLAGS) and linker flags (LDFLAGS) can be provided.
 CONFIG_CC=clang
 CONFIG_DEBUG=y
+CONFIG_CFLAGS=
+CONFIG_LDFLAGS=
 
 ## Libraries
 # Explicit compiler flags for compilation (CFLAGS) and linking (LDFLAGS) go here.