Link BusyBox dynamically

make/busybox.mk

@@ -4,12 +4,17 @@ dest/bin/busybox: build/busybox/busybox
 build/busybox/busybox: build/busybox/.config dest/usr/lib/libc.a
 	$(MAKE) -C build/busybox
 
-build/busybox/.config:
+build/busybox/musl-gcc.specs:
+	mkdir -p build/busybox
+	./musl-gcc-specs.sh $(ABS_REPO)/dest/usr/include $(ABS_REPO)/dest/usr/lib /lib/ld-musl-x86_64.so.1 > build/busybox/musl-gcc.specs
+
+build/busybox/.config: build/busybox/musl-gcc.specs
 	mkdir -p build/busybox
 	$(MAKE) -C build/busybox -f $(ABS_REPO)/vendor/busybox/Makefile KBUILD_SRC=$(ABS_REPO)/vendor/busybox defconfig
 	cp build/busybox/.config build/busybox/.config.bak
+	sed -i 's!^#* *CONFIG_EXTRA_CFLAGS[ =].*$$!CONFIG_EXTRA_CFLAGS="-specs $(ABS_REPO)/build/busybox/musl-gcc.specs"!' build/busybox/.config
 	sed -i 's!^#* *CONFIG_PREFIX[ =].*$$!CONFIG_PREFIX="$(ABS_REPO)/dest"!'       build/busybox/.config
-	sed -i 's!^#* *CONFIG_STATIC[ =].*$$!CONFIG_STATIC=y!'                        build/busybox/.config
+	#sed -i 's!^#* *CONFIG_STATIC[ =].*$$!CONFIG_STATIC=y!'                        build/busybox/.config
 	sed -i 's!^#* *CONFIG_SYSROOT[ =].*$$!CONFIG_SYSROOT="$(ABS_REPO)/dest"!'     build/busybox/.config
 	sed -i 's!^#* *CONFIG_WERROR[ =].*$$!CONFIG_WERROR=n!'                        build/busybox/.config
 	# It's for Linux

musl-gcc-specs.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+set -eu
+
+incdir="$1"
+libdir="$2"
+ldso="$3"
+
+cat <<EOF
+%rename cpp_options old_cpp_options
+
+*cpp_options:
+-nostdinc -isystem $incdir -isystem include%s %(old_cpp_options)
+
+*cc1:
+%(cc1_cpu) -nostdinc -isystem $incdir -isystem include%s
+
+*link_libgcc:
+-L$libdir -L .%s
+
+*libgcc:
+libgcc.a%s %:if-exists(libgcc_eh.a%s)
+
+*startfile:
+%{!shared: $libdir/Scrt1.o} $libdir/crti.o crtbeginS.o%s
+
+*endfile:
+crtendS.o%s $libdir/crtn.o
+
+*link:
+-dynamic-linker $ldso -nostdlib %{shared:-shared} %{static:-static} %{rdynamic:-export-dynamic}
+
+*esp_link:
+
+
+*esp_options:
+
+
+*esp_cpp_options:
+
+
+EOF