Modernize TestWeakSymbols Makefile

CFLAGS_EXTRAS := -std=c99

LD_FLAGS := -dynamiclib

include Makefile.rules

all: a.out dylib missing

C_SOURCES := main.c

CFLAGS_EXTRAS := -std=c99 -fmodules

LD_EXTRAS := -ldylib -L.

dylib: dylib.o

	$(CC)  $(LD_FLAGS) -o libdylib.dylib dylib.o

missing: dylib2.o

	mkdir hidden

	$(CC)  $(LD_FLAGS) -o hidden/libdylib.dylib dylib2.o

all: a.out hidden/libdylib.dylib

a.out: main.o dylib missing

	$(CC)  $(CFLAGS) -L. -ldylib main.o

a.out: libdylib.dylib

dylib.o: dylib.h $(SRCDIR)/dylib.c

	$(CC) -DHAS_THEM  $(CFLAGS) -c $(SRCDIR)/dylib.c

dylib2.o: dylib.h $(SRCDIR)/dylib.c

	$(CC)  $(CFLAGS) -c $(SRCDIR)/dylib.c -o dylib2.o

include Makefile.rules

main.o: dylib.h $(SRCDIR)/main.c

	$(CC)  $(CFLAGS) -c $(SRCDIR)/main.c -fmodules -fmodules-cache-path=$(CLANG_MODULE_CACHE_DIR)

libdylib.dylib: dylib.c

	$(MAKE) -C $(BUILDDIR) -f $(MAKEFILE_RULES) \

		C_SOURCES= DYLIB_C_SOURCES=dylib.c DYLIB_NAME=dylib \

		CFLAGS_EXTRAS=-DHAS_THEM LD_EXTRAS=-dynamiclib

hidden/libdylib.dylib:

	mkdir hidden

	$(MAKE) -C $(BUILDDIR)/hidden -f $(MAKEFILE_RULES) \

		C_SOURCES= DYLIB_C_SOURCES=dylib.c DYLIB_NAME=dylib \

		LD_EXTRAS=-dynamiclib