master b35431b218a: Fix bootstrap-clean in the cross directory on USG

[Po Lu]

branch: master
commit b35431b218ada2d84eb251d18e5543388b598d80
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Fix bootstrap-clean in the cross directory on USG
    
    * cross/Makefile.in (FIND_DELETE): New variable.
    (CLEAN_SUBDIRS): Avoid including src if not already present.
    (clean, bootstrap-clean, etc): Use FIND_DELETE.
---
 cross/Makefile.in | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/cross/Makefile.in b/cross/Makefile.in
index a7b5700440e..b66025283aa 100644
--- a/cross/Makefile.in
+++ b/cross/Makefile.in
@@ -22,6 +22,8 @@ srcdir = @srcdir@
 top_builddir = @top_builddir@
 builddir = @builddir@
 
+FIND_DELETE = @FIND_DELETE@
+
 -include $(top_builddir)/src/verbose.mk
 
 # Cross-compiling Emacs for Android.
@@ -51,7 +53,7 @@ LIB_SRC_TOP_SRCDIR = $(realpath $(top_src))
 LIBSRC_BINARIES = lib-src/etags lib-src/ctags lib-src/emacsclient \
                  lib-src/ebrowse lib-src/hexl lib-src/movemail
 
-CLEAN_SUBDIRS = src lib-src lib etc
+CLEAN_SUBDIRS = $(wildcard src lib-src lib etc)
 
 .PHONY: all
 all: lib/libgnu.a src/libemacs.so src/android-emacs $(LIBSRC_BINARIES)
@@ -174,17 +176,19 @@ $(LIBSRC_BINARIES) &: src/verbose.mk $(top_builddir)/$@ 
lib/libgnu.a \
 
 .PHONY: clean maintainer-clean distclean
 clean:
-       for dir in $(CLEAN_SUBDIRS); do \
-         find $$dir -type f -delete;   \
+       for dir in $(CLEAN_SUBDIRS); do         \
+         find $$dir -type f $(FIND_DELETE);    \
        done
        rm -rf lib/config.h lib-src/config.h
 # ndk-build won't have been generated in a non-Android build.
-       -make -C ndk-build clean
+       if test -f ndk-build/Makefile; then     \
+          $(MAKE) -C ndk-build clean;          \
+       fi
 
 maintainer-clean distclean bootstrap-clean: clean
 # Remove links created by configure.
-       for dir in $(CLEAN_SUBDIRS); do \
-         find $$dir -type l -delete;   \
+       for dir in $(CLEAN_SUBDIRS); do         \
+         find $$dir -type l $(FIND_DELETE);    \
        done
        rm -rf lib/Makefile lib/gnulib.mk ndk-build/Makefile
        rm -rf ndk-build/ndk-build.mk Makefile