Test pseudo-namespaces in C

In C you can create pseudo-namespaces by abusing structs of function
pointers, making function calls look like `module.func(x)` instead of
`func(x)`.

A lot of people online spout that this creates overhead, but this should
show that clang>=15.0.7 will still inline such function calls. GCC 11.3.1
is unable  to inline the function, but will still call the function
directly.

Makefile

@@ -0,0 +1,29 @@
+
+CC ?= clang
+
+# compiler specific flags
+CFLAGS.gcc := 
+CFLAGS.clang := 
+
+# general flags
+CFLAGS := \
+	-Wall -Wextra -Werror -Wpedantic \
+	-O3 -g -flto \
+	-std=c2x \
+	${CFLAGS.${CC}} \
+	-DNAMESPACES \
+
+LDFLAGS := \
+	-flto \
+	-Wl,-O3
+
+dump.asm : test
+	gdb $< -batch -ex 'disassemble main' > $@
+	(gdb $< -batch -ex 'disassemble succ' >> $@) || true
+
+test : main.o module.o
+	$(CC) $(CFLAGS) -o $@ $^
+
+%.o : %.c
+	$(CC) $(CFLAGS) -o $@ -c $^
+