tools: add gnulib source

By having a local copy of gnulib, we can:
import the latest macro fixes into any package,
get rid of some statically stored macros that were otherwise missing,
bootstrap GNU tools with the latest relevant source
without having to wait for a release or rely on git submodules,
and possibly more...

The patch assists in bootstrapping by ignoring
the building of po files using gettext,
and also to allow a user-defined path to a program
to include parameters.

Signed-off-by: Michael Pratt <mcpratt@pm.me>

rules.mk

@@ -358,6 +358,7 @@ ifeq ($(CONFIG_BUILD_LOG),y)
 endif
 
 export BISON_PKGDATADIR:=$(STAGING_DIR_HOST)/share/bison
+export HOST_GNULIB_SRCDIR:=$(STAGING_DIR_HOST)/share/gnulib
 export M4:=$(STAGING_DIR_HOST)/bin/m4
 
 define shvar

tools/Makefile

@@ -45,6 +45,7 @@ tools-y += findutils
 tools-y += firmware-utils
 tools-y += flex
 tools-y += gengetopt
+tools-y += gnulib
 tools-y += libressl
 tools-y += libtool
 tools-y += lzma

tools/gnulib/Makefile

@@ -0,0 +1,25 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=gnulib
+PKG_CPE_ID:=cpe:/a:gnu:$(PKG_NAME)
+PKG_VERSION:=f9a4ee73c3e7b544f640d0d04b55983d3a7b894e# # master
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://git.savannah.gnu.org/cgit/$(PKG_NAME).git/snapshot
+PKG_HASH:=514716d58987a9c0de0d69fb22d42bcd19edf80eed099882a004ff162060f1a8
+
+include $(INCLUDE_DIR)/host-build.mk
+
+define Host/Configure
+endef
+
+define Host/Install
+	$(INSTALL_DIR) $(1)/share/gnulib
+	$(CP) $(HOST_BUILD_DIR)/* $(1)/share/gnulib/
+endef
+
+define Host/Clean
+	rm -rf $(STAGING_DIR_HOST)/share/gnulib
+endef
+
+$(eval $(call HostBuild))

tools/gnulib/patches/000-bootstrap.patch

@@ -0,0 +1,54 @@
+--- a/build-aux/bootstrap
++++ b/build-aux/bootstrap
+@@ -237,14 +237,14 @@ test -r "$conffile" && . "$conffile"
+ 
+ check_exists() {
+   if test "$1" = "--verbose"; then
+-    ($2 --version </dev/null) >/dev/null 2>&1
++    ($2 $3 $4 --version </dev/null) >/dev/null 2>&1
+     if test $? -ge 126; then
+       # If not found, run with diagnostics as one may be
+       # presented with env variables to set to find the right version
+-      ($2 --version </dev/null)
++      ($2 $3 $4 --version </dev/null)
+     fi
+   else
+-    ($1 --version </dev/null) >/dev/null 2>&1
++    ($@ --version </dev/null) >/dev/null 2>&1
+   fi
+ 
+   test $? -lt 126
+@@ -309,7 +309,7 @@ p
+ q'
+ 
+ get_version() {
+-  app=$1
++  app="$@"
+ 
+   $app --version >/dev/null 2>&1 || { $app --version; return 1; }
+ 
+@@ -366,13 +366,13 @@ check_versions() {
+     if [ "$req_ver" = "-" ]; then
+       # Merely require app to exist; not all prereq apps are well-behaved
+       # so we have to rely on $? rather than get_version.
+-      if ! check_exists --verbose $app; then
++      if ! check_exists --verbose "$app"; then
+         warn_ "Error: '$app' not found"
+         ret=1
+       fi
+     else
+       # Require app to produce a new enough version string.
+-      inst_ver=$(get_version $app)
++      inst_ver=$(get_version "$app")
+       if [ ! "$inst_ver" ]; then
+         warn_ "Error: '$app' not found"
+         ret=1
+@@ -1135,7 +1135,7 @@ autogen()
+   # two just-pre-run programs.
+ 
+   # Import from gettext.
+-  with_gettext=yes
++  with_gettext=no
+   grep '^[	 ]*AM_GNU_GETTEXT_VERSION(' configure.ac >/dev/null || \
+       with_gettext=no
+