Get Fabrice Bellard's JavaScript engine to build

$ m=tiny
$ make -j12 MODE=$m o/$m/third_party/quickjs/qjs.com
$ o/$m/third_party/quickjs/qjs.com -e 'console.log(2 + 2)'
4
$ ls -hal o/$m/third_party/quickjs/qjs.com
631.5K

See #97

third_party/quickjs/quickjs.mk

@@ -0,0 +1,85 @@
+#-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
+#───vi: set et ft=make ts=8 tw=8 fenc=utf-8 :vi───────────────────────┘
+
+PKGS += THIRD_PARTY_QUICKJS
+
+THIRD_PARTY_QUICKJS_FILES := $(wildcard third_party/quickjs/*)
+THIRD_PARTY_QUICKJS_SRCS = $(filter %.c,$(THIRD_PARTY_QUICKJS_FILES))
+THIRD_PARTY_QUICKJS_HDRS = $(filter %.h,$(THIRD_PARTY_QUICKJS_FILES))
+THIRD_PARTY_QUICKJS_BINS = $(THIRD_PARTY_QUICKJS_COMS) $(THIRD_PARTY_QUICKJS_COMS:%=%.dbg)
+THIRD_PARTY_QUICKJS = $(THIRD_PARTY_QUICKJS_DEPS) $(THIRD_PARTY_QUICKJS_A)
+THIRD_PARTY_QUICKJS_A = o/$(MODE)/third_party/quickjs/quickjs.a
+
+THIRD_PARTY_QUICKJS_OBJS =				\
+	$(THIRD_PARTY_QUICKJS_SRCS:%.c=o/$(MODE)/%.o)
+
+THIRD_PARTY_QUICKJS_COMS =				\
+	o/$(MODE)/third_party/quickjs/qjs.com
+
+THIRD_PARTY_QUICKJS_CHECKS =				\
+	$(THIRD_PARTY_QUICKJS_A).pkg			\
+	$(THIRD_PARTY_QUICKJS_HDRS:%=o/$(MODE)/%.ok)
+
+THIRD_PARTY_QUICKJS_DIRECTDEPS =			\
+	LIBC_ALG					\
+	LIBC_CALLS					\
+	LIBC_FMT					\
+	LIBC_INTRIN					\
+	LIBC_LOG					\
+	LIBC_MEM					\
+	LIBC_NEXGEN32E					\
+	LIBC_RUNTIME					\
+	LIBC_SOCK					\
+	LIBC_STDIO					\
+	LIBC_STR					\
+	LIBC_SYSV					\
+	LIBC_SYSV_CALLS					\
+	LIBC_TIME					\
+	LIBC_TINYMATH					\
+	LIBC_UNICODE					\
+	LIBC_X						\
+	THIRD_PARTY_COMPILER_RT				\
+	THIRD_PARTY_GDTOA				\
+	THIRD_PARTY_GETOPT				\
+	THIRD_PARTY_MUSL
+
+THIRD_PARTY_QUICKJS_DEPS :=				\
+	$(call uniq,$(foreach x,$(THIRD_PARTY_QUICKJS_DIRECTDEPS),$($(x))))
+
+$(THIRD_PARTY_QUICKJS_A):				\
+		third_party/quickjs/			\
+		$(THIRD_PARTY_QUICKJS_A).pkg		\
+		$(filter-out %/quickjs.c,$(THIRD_PARTY_QUICKJS_OBJS))
+
+$(THIRD_PARTY_QUICKJS_A).pkg:				\
+		$(THIRD_PARTY_QUICKJS_OBJS)		\
+		$(foreach x,$(THIRD_PARTY_QUICKJS_DIRECTDEPS),$($(x)_A).pkg)
+
+o/$(MODE)/third_party/quickjs/qjs.com.dbg:		\
+		$(THIRD_PARTY_QUICKJS_DEPS)		\
+		$(THIRD_PARTY_QUICKJS_A)		\
+		$(THIRD_PARTY_QUICKJS_A).pkg		\
+		o/$(MODE)/third_party/quickjs/qjs.o	\
+		$(CRT)					\
+		$(APE)
+	-@$(APELINK)
+
+$(THIRD_PARTY_QUICKJS_OBJS):				\
+		OVERRIDE_CPPFLAGS +=			\
+			-DCONFIG_BIGNUM			\
+			-DCONFIG_VERSION=\"$(shell cat third_party/quickjs/VERSION)\"
+
+o/$(MODE)/third_party/quickjs/unicode_gen.o:		\
+		OVERRIDE_CPPFLAGS +=			\
+			-DSTACK_FRAME_UNLIMITED
+
+# TODO(jart): Replace alloca() calls with malloc().
+o/$(MODE)/third_party/quickjs/libregexp.o		\
+o/$(MODE)/third_party/quickjs/quickjs.o:		\
+		OVERRIDE_CPPFLAGS +=			\
+			-DSTACK_FRAME_UNLIMITED
+
+.PHONY: o/$(MODE)/third_party/quickjs
+o/$(MODE)/third_party/quickjs:				\
+		$(THIRD_PARTY_QUICKJS_BINS)		\
+		$(THIRD_PARTY_QUICKJS_CHECKS)