prereq: prefer existing built coreutils as symlink target

For the utilities provided by coreutils
but required before coreutils is built,
if coreutils is actually built already, prefer a symlink to
the built versions instead of the host machine's version.

Tested-by: Georgi Valkov <[email protected]> # macOS
Signed-off-by: Michael Pratt <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16522
Signed-off-by: Robert Marko <[email protected]>

include/prereq-build.mk

@@ -126,10 +126,12 @@ $(eval $(call SetupHostCommand,diff,Please install GNU diffutils, \
 	diff --version 2>&1 | grep GNU))
 
 $(eval $(call SetupHostCommand,cp,Please install GNU fileutils, \
+	$(TOPDIR)/staging_dir/host/bin/gcp --help 2>&1 | grep 'Copy SOURCE', \
 	gcp --help 2>&1 | grep 'Copy SOURCE', \
 	cp --help 2>&1 | grep 'Copy SOURCE'))
 
 $(eval $(call SetupHostCommand,seq,Please install seq, \
+	$(TOPDIR)/staging_dir/host/bin/gseq --version, \
 	gseq --version, \
 	seq --version 2>&1 | grep seq))
 
@@ -153,10 +155,12 @@ $(eval $(call SetupHostCommand,getopt, \
 	/opt/local/bin/getopt -o t --long test -- --test | grep '^ *--test *--'))
 
 $(eval $(call SetupHostCommand,realpath,Please install a 'realpath' utility, \
+	$(TOPDIR)/staging_dir/host/bin/grealpath /, \
 	grealpath /, \
 	realpath /))
 
 $(eval $(call SetupHostCommand,stat,Cannot find a file stat utility, \
+	$(TOPDIR)/staging_dir/host/bin/gstat -c%s $(TOPDIR)/Makefile, \
 	gnustat -c%s $(TOPDIR)/Makefile, \
 	gstat -c%s $(TOPDIR)/Makefile, \
 	stat -c%s $(TOPDIR)/Makefile))
@@ -175,6 +179,7 @@ $(eval $(call SetupHostCommand,wget,Please install GNU 'wget', \
 	wget --version | grep GNU))
 
 $(eval $(call SetupHostCommand,install,Please install GNU 'install', \
+	$(TOPDIR)/staging_dir/host/bin/ginstall --version | grep GNU, \
 	install --version | grep GNU, \
 	ginstall --version | grep GNU))