Perform shallow clones of submodules

Greatly reduces the time it takes to checkout the various submodules, and also reduces required storage.

Signed-off-by: Nick Kossifidis <[email protected]>

.gitmodules

@@ -2,44 +2,56 @@
 	path = binutils
 	url = https://sourceware.org/git/binutils-gdb.git
 	branch = binutils-2_43-branch
+	shallow = true
 [submodule "gcc"]
 	path = gcc
 	url = https://gcc.gnu.org/git/gcc.git
 	branch = releases/gcc-14
+	shallow = true
 [submodule "glibc"]
 	path = glibc
 	url = https://sourceware.org/git/glibc.git
+	shallow = true
 [submodule "dejagnu"]
 	path = dejagnu
 	url = https://git.savannah.gnu.org/git/dejagnu.git
 	branch = master
+	shallow = true
 [submodule "newlib"]
 	path = newlib
 	url = https://sourceware.org/git/newlib-cygwin.git
 	branch = master
+	shallow = true
 [submodule "gdb"]
 	path = gdb
 	url = https://sourceware.org/git/binutils-gdb.git
 	branch = gdb-15-branch
+	shallow = true
 [submodule "qemu"]
 	path = qemu
 	url = https://gitlab.com/qemu-project/qemu.git
+	shallow = true
 [submodule "musl"]
 	path = musl
 	url = https://git.musl-libc.org/git/musl
 	branch = master
+	shallow = true
 [submodule "spike"]
 	path = spike
 	url = https://github.com/riscv-software-src/riscv-isa-sim.git
 	branch = master
+	shallow = true
 [submodule "pk"]
 	path = pk
 	url = https://github.com/riscv-software-src/riscv-pk.git
 	branch = master
+	shallow = true
 [submodule "llvm"]
 	path = llvm
 	url = https://github.com/llvm/llvm-project.git
 	branch = release/17.x
+	shallow = true
 [submodule "uclibc-ng"]
 	path = uclibc-ng
-	url = https://git.uclibc-ng.org/git/uclibc-ng.git
+	url = https://github.com/wbx-github/uclibc-ng.git
+	shallow = true

Makefile.in

@@ -347,7 +347,7 @@ endif
 $(srcdir)/%/.git:
 	cd $(srcdir) && \
 	flock `git rev-parse --git-dir`/config git submodule init $(dir $@) && \
-	flock `git rev-parse --git-dir`/config git submodule update --progress $(dir $@)
+	flock `git rev-parse --git-dir`/config git submodule update --progress --depth 1 $(dir $@)
 
 stamps/install-host-gcc: $(GCC_SRCDIR) $(GCC_SRC_GIT)
 	if test -f $</contrib/download_prerequisites && test "@NEED_GCC_EXTERNAL_LIBRARIES@" = "true"; then cd $< && ./contrib/download_prerequisites; fi