Option for specifying custom parent source path

Set the parent source path with `--with-src` (e.i --with-src=/path/to/parent)
Use `arc-gnu-toolchain` as parent source by default.

Signed-off-by: Luis Silva <[email protected]>

Author: luismgsilva

Makefile.in

@@ -23,28 +23,33 @@ LINUX_BRANCH 		:= arc64
 
 
 BINUTILS_SRCDIR		:= @with_binutils_src@
-ifeq ($(BINUTILS_SRCDIR),)
-BINUTILS_SRCDIR		:= $(srcdir)/binutils-gdb
-endif
 NEWLIB_SRCDIR		:= @with_newlib_src@
-ifeq ($(NEWLIB_SRCDIR),)
-NEWLIB_SRCDIR		:= $(srcdir)/newlib
-endif
 GCC_SRCDIR		:= @with_gcc_src@
-ifeq ($(GCC_SRCDIR),)
-GCC_SRCDIR		:= $(srcdir)/gcc
-endif
 GLIBC_SRCDIR		:= @with_glibc_src@
-ifeq ($(GLIBC_SRCDIR),)
-GLIBC_SRCDIR		:= $(srcdir)/glibc
-endif
 LINUX_SRCDIR		:= @with_linux_src@
-ifeq ($(LINUX_SRCDIR),)
-LINUX_SRCDIR		:= $(srcdir)/linux
-endif
 QEMU_SRCDIR		:= @with_qemu_src@
-ifeq ($(QEMU_SRCDIR),)
-QEMU_SRCDIR		:= $(srcdir)/qemu
+
+PARENT_SRCDIR = @with_src@
+
+ifneq ($(PARENT_SRCDIR),)
+ifeq ($(BINUTILS_SRCDIR),$(srcdir)/binutils-gdb)
+BINUTILS_SRCDIR = $(PARENT_SRCDIR)/binutils-gdb
+endif
+ifeq ($(NEWLIB_SRCDIR),$(srcdir)/newlib)
+NEWLIB_SRCDIR = $(PARENT_SRCDIR)/newlib
+endif
+ifeq ($(GCC_SRCDIR),$(srcdir)/gcc)
+GCC_SRCDIR = $(PARENT_SRCDIR)/gcc
+endif
+ifeq ($(GLIBC_SRCDIR),$(srcdir)/glibc)
+GLIBC_SRCDIR = $(PARENT_SRCDIR)/glibc
+endif
+ifeq ($(LINUX_SRCDIR),$(srcdir)/linux)
+LINUX_SRCDIR = $(PARENT_SRCDIR)/linux
+endif
+ifeq ($(QEMU_SRCDIR),$(srcdir)/qemu)
+QEMU_SRCDIR = $(PARENT_SRCDIR)/qemu
+endif
 endif
 
 SYSROOT := $(INSTALL_DIR)/sysroot

configure.ac

@@ -177,13 +177,23 @@ AC_DEFUN([AX_ARG_WITH_SRC],
 	  m4_popdef([opt_name])
 	}])
 
-AX_ARG_WITH_SRC(binutils, binutils)
+AX_ARG_WITH_SRC(binutils, binutils-gdb)
 AX_ARG_WITH_SRC(newlib, newlib)
 AX_ARG_WITH_SRC(gcc, gcc)
 AX_ARG_WITH_SRC(glibc, glibc)
 AX_ARG_WITH_SRC(linux, linux)
 AX_ARG_WITH_SRC(qemu, qemu)
 
+AC_ARG_WITH(src,
+	[AS_HELP_STRING([--with-src],
+		[Select parent source path, use `arc-gnu-toolchain` as parent source path by default])],
+	[],
+	[]
+	)
+AS_IF([test "x$with_src" != x],
+    [AC_SUBST(with_src, $with_src)],
+	[AC_SUBST(with_src, "")])
+
 
 AC_ARG_WITH(target_cflags,
 	[AS_HELP_STRING([--with-target-cflags],