Add a "fork" of musl as //fusl.

fusl/Makefile

+#
+# Makefile for musl (requires GNU make)
+#
+# This is how simple every makefile should be...
+# No, I take that back - actually most should be less than half this size.
+#
+# Use config.mak to override any of the following variables.
+# Do not make changes here.
+#
+
+exec_prefix = /usr/local
+bindir = $(exec_prefix)/bin
+
+prefix = /usr/local/musl
+includedir = $(prefix)/include
+libdir = $(prefix)/lib
+syslibdir = /lib
+
+SRCS = $(sort $(wildcard src/*/*.c arch/$(ARCH)/src/*.c))
+OBJS = $(SRCS:.c=.o)
+LOBJS = $(OBJS:.o=.lo)
+GENH = include/bits/alltypes.h
+GENH_INT = src/internal/version.h
+IMPH = src/internal/stdio_impl.h src/internal/pthread_impl.h src/internal/libc.h
+
+LDFLAGS =
+LDFLAGS_AUTO =
+LIBCC = -lgcc
+CPPFLAGS =
+CFLAGS =
+CFLAGS_AUTO = -Os -pipe
+CFLAGS_C99FSE = -std=c99 -ffreestanding -nostdinc 
+
+CFLAGS_ALL = $(CFLAGS_C99FSE)
+CFLAGS_ALL += -D_XOPEN_SOURCE=700 -I./arch/$(ARCH) -I./src/internal -I./include
+CFLAGS_ALL += $(CPPFLAGS) $(CFLAGS_AUTO) $(CFLAGS)
+CFLAGS_ALL_STATIC = $(CFLAGS_ALL)
+CFLAGS_ALL_SHARED = $(CFLAGS_ALL) -fPIC -DSHARED
+
+LDFLAGS_ALL = $(LDFLAGS_AUTO) $(LDFLAGS)
+
+AR      = $(CROSS_COMPILE)ar
+RANLIB  = $(CROSS_COMPILE)ranlib
+INSTALL = ./tools/install.sh
+
+ARCH_INCLUDES = $(wildcard arch/$(ARCH)/bits/*.h)
+ALL_INCLUDES = $(sort $(wildcard include/*.h include/*/*.h) $(GENH) $(ARCH_INCLUDES:arch/$(ARCH)/%=include/%))
+
+EMPTY_LIB_NAMES = m rt pthread crypt util xnet resolv dl
+EMPTY_LIBS = $(EMPTY_LIB_NAMES:%=lib/lib%.a)
+CRT_LIBS = lib/crt1.o lib/Scrt1.o lib/rcrt1.o lib/crti.o lib/crtn.o
+STATIC_LIBS = lib/libc.a
+SHARED_LIBS = lib/libc.so
+TOOL_LIBS = lib/musl-gcc.specs
+ALL_LIBS = $(CRT_LIBS) $(STATIC_LIBS) $(SHARED_LIBS) $(EMPTY_LIBS) $(TOOL_LIBS)
+ALL_TOOLS = tools/musl-gcc
+
+WRAPCC_GCC = gcc
+WRAPCC_CLANG = clang
+
+LDSO_PATHNAME = $(syslibdir)/ld-musl-$(ARCH)$(SUBARCH).so.1
+
+-include config.mak
+
+all: $(ALL_LIBS) $(ALL_TOOLS)
+
+install: install-libs install-headers install-tools
+
+clean:
+        rm -f crt/*.o
+        rm -f $(OBJS)
+        rm -f $(LOBJS)
+        rm -f $(ALL_LIBS) lib/*.[ao] lib/*.so
+        rm -f $(ALL_TOOLS)
+        rm -f $(GENH) $(GENH_INT)
+        rm -f include/bits
+
+distclean: clean
+        rm -f config.mak
+
+include/bits:
+        @test "$(ARCH)" || { echo "Please set ARCH in config.mak before running make." ; exit 1 ; }
+        ln -sf ../arch/$(ARCH)/bits $@
+
+include/bits/alltypes.h.in: include/bits
+
+include/bits/alltypes.h: include/bits/alltypes.h.in include/alltypes.h.in tools/mkalltypes.sed
+        sed -f tools/mkalltypes.sed include/bits/alltypes.h.in include/alltypes.h.in > $@
+
+src/internal/version.h: $(wildcard VERSION .git)
+        printf '#define VERSION "%s"\n' "$$(sh tools/version.sh)" > $@
+
+src/internal/version.o src/internal/version.lo: src/internal/version.h
+
+crt/rcrt1.o src/ldso/dlstart.lo src/ldso/dynlink.lo: src/internal/dynlink.h arch/$(ARCH)/reloc.h
+
+crt/crt1.o crt/Scrt1.o crt/rcrt1.o src/ldso/dlstart.lo: $(wildcard arch/$(ARCH)/crt_arch.h)
+
+crt/rcrt1.o: src/ldso/dlstart.c
+
+crt/Scrt1.o crt/rcrt1.o: CFLAGS_ALL += -fPIC
+
+OPTIMIZE_SRCS = $(wildcard $(OPTIMIZE_GLOBS:%=src/%))
+$(OPTIMIZE_SRCS:%.c=%.o) $(OPTIMIZE_SRCS:%.c=%.lo): CFLAGS += -O3
+
+MEMOPS_SRCS = src/string/memcpy.c src/string/memmove.c src/string/memcmp.c src/string/memset.c
+$(MEMOPS_SRCS:%.c=%.o) $(MEMOPS_SRCS:%.c=%.lo): CFLAGS_ALL += $(CFLAGS_MEMOPS)
+
+NOSSP_SRCS = $(wildcard crt/*.c) \
+        src/env/__libc_start_main.c src/env/__init_tls.c \
+        src/thread/__set_thread_area.c src/env/__stack_chk_fail.c \
+        src/string/memset.c src/string/memcpy.c \
+        src/ldso/dlstart.c src/ldso/dynlink.c
+$(NOSSP_SRCS:%.c=%.o) $(NOSSP_SRCS:%.c=%.lo): CFLAGS_ALL += $(CFLAGS_NOSSP)
+
+$(CRT_LIBS:lib/%=crt/%): CFLAGS_ALL += -DCRT
+
+# This incantation ensures that changes to any subarch asm files will
+# force the corresponding object file to be rebuilt, even if the implicit
+# rule below goes indirectly through a .sub file.
+define mkasmdep
+$(dir $(patsubst %/,%,$(dir $(1))))$(notdir $(1:.s=.o)): $(1)
+endef
+$(foreach s,$(wildcard src/*/$(ARCH)*/*.s),$(eval $(call mkasmdep,$(s))))
+
+# Choose invocation of assembler to be used
+# $(1) is input file, $(2) is output file, $(3) is assembler flags
+ifeq ($(ADD_CFI),yes)
+        AS_CMD = LC_ALL=C awk -f tools/add-cfi.common.awk -f tools/add-cfi.$(ARCH).awk $< | $(CC) -x assembler -c -o $@ -
+else
+        AS_CMD = $(CC) -c -o $@ $<
+endif
+
+%.o: $(ARCH)$(ASMSUBARCH)/%.sub
+        $(CC) $(CFLAGS_ALL_STATIC) -c -o $@ $(dir $<)$(shell cat $<)
+
+%.o: $(ARCH)/%.s
+        $(AS_CMD) $(CFLAGS_ALL_STATIC)
+
+%.o: %.c $(GENH) $(IMPH)
+        $(CC) $(CFLAGS_ALL_STATIC) -c -o $@ $<
+
+%.lo: $(ARCH)$(ASMSUBARCH)/%.sub
+        $(CC) $(CFLAGS_ALL_SHARED) -c -o $@ $(dir $<)$(shell cat $<)
+
+%.lo: $(ARCH)/%.s
+        $(AS_CMD) $(CFLAGS_ALL_SHARED)
+
+%.lo: %.c $(GENH) $(IMPH)
+        $(CC) $(CFLAGS_ALL_SHARED) -c -o $@ $<
+
+lib/libc.so: $(LOBJS)
+        $(CC) $(CFLAGS_ALL_SHARED) $(LDFLAGS_ALL) -nostdlib -shared \
+        -Wl,-e,_dlstart -Wl,-Bsymbolic-functions \
+        -o $@ $(LOBJS) $(LIBCC)
+
+lib/libc.a: $(OBJS)
+        rm -f $@
+        $(AR) rc $@ $(OBJS)
+        $(RANLIB) $@
+
+$(EMPTY_LIBS):
+        rm -f $@
+        $(AR) rc $@
+
+lib/%.o: crt/%.o
+        cp $< $@
+
+lib/musl-gcc.specs: tools/musl-gcc.specs.sh config.mak
+        sh $< "$(includedir)" "$(libdir)" "$(LDSO_PATHNAME)" > $@
+
+tools/musl-gcc: config.mak
+        printf '#!/bin/sh\nexec "$${REALGCC:-$(WRAPCC_GCC)}" "$$@" -specs "%s/musl-gcc.specs"\n' "$(libdir)" > $@
+        chmod +x $@
+
+tools/%-clang: tools/%-clang.in config.mak
+        sed -e 's!@CC@!$(WRAPCC_CLANG)!g' -e 's!@PREFIX@!$(prefix)!g' -e 's!@INCDIR@!$(includedir)!g' -e 's!@LIBDIR@!$(libdir)!g' -e 's!@LDSO@!$(LDSO_PATHNAME)!g' $< > $@
+        chmod +x $@
+
+$(DESTDIR)$(bindir)/%: tools/%
+        $(INSTALL) -D $< $@
+
+$(DESTDIR)$(libdir)/%.so: lib/%.so
+        $(INSTALL) -D -m 755 $< $@
+
+$(DESTDIR)$(libdir)/%: lib/%
+        $(INSTALL) -D -m 644 $< $@
+
+$(DESTDIR)$(includedir)/bits/%: arch/$(ARCH)/bits/%
+        $(INSTALL) -D -m 644 $< $@
+
+$(DESTDIR)$(includedir)/%: include/%
+        $(INSTALL) -D -m 644 $< $@
+
+$(DESTDIR)$(LDSO_PATHNAME): $(DESTDIR)$(libdir)/libc.so
+        $(INSTALL) -D -l $(libdir)/libc.so $@ || true
+
+install-libs: $(ALL_LIBS:lib/%=$(DESTDIR)$(libdir)/%) $(if $(SHARED_LIBS),$(DESTDIR)$(LDSO_PATHNAME),)
+
+install-headers: $(ALL_INCLUDES:include/%=$(DESTDIR)$(includedir)/%)
+
+install-tools: $(ALL_TOOLS:tools/%=$(DESTDIR)$(bindir)/%)
+
+musl-git-%.tar.gz: .git
+         git archive --format=tar.gz --prefix=$(patsubst %.tar.gz,%,$@)/ -o $@ $(patsubst musl-git-%.tar.gz,%,$@)
+
+musl-%.tar.gz: .git
+         git archive --format=tar.gz --prefix=$(patsubst %.tar.gz,%,$@)/ -o $@ v$(patsubst musl-%.tar.gz,%,$@)
+
+.PHONY: all clean install install-libs install-headers install-tools