btrfs-progs: autoconf: make btrfs-convert build optional

Proposed at https://github.com/kdave/btrfs-progs/pull/6, I've added the
configure options.

Signed-off-by: David Sterba <dsterba@suse.cz>

Makefile.in

@@ -8,6 +8,7 @@ RM = @RM@
 RMDIR = @RMDIR@
 INSTALL = @INSTALL@
 DISABLE_DOCUMENTATION = @DISABLE_DOCUMENTATION@
+DISABLE_BTRFSCONVERT = @DISABLE_BTRFSCONVERT@
 
 # Non-static compilation flags
 CFLAGS = @CFLAGS@ \
@@ -67,7 +68,7 @@ endif
 MAKEOPTS = --no-print-directory Q=$(Q)
 
 progs = mkfs.btrfs btrfs-debug-tree btrfsck \
-	btrfs btrfs-map-logical btrfs-image btrfs-zero-log btrfs-convert \
+	btrfs btrfs-map-logical btrfs-image btrfs-zero-log \
 	btrfs-find-root btrfstune btrfs-show-super \
 	btrfs-corrupt-block btrfs-select-super btrfs-calc-size
 
@@ -75,6 +76,10 @@ progs_extra = btrfs-fragments
 
 progs_static = $(foreach p,$(progs),$(p).static)
 
+ifneq ($(DISABLE_BTRFSCONVERT),1)
+progs += btrfs-convert
+endif
+
 # external libs required by various binaries; for btrfs-foo,
 # specify btrfs_foo_libs = <list of libs>; see $($(subst...)) rules below
 btrfs_convert_libs = -lext2fs -lcom_err

configure.ac

@@ -85,6 +85,14 @@ if test "x$enable_documentation" = xyes; then
 	AC_PROG_SED
 fi
 
+AC_ARG_ENABLE([convert],
+	      AS_HELP_STRING([--disable-convert], [do not build btrfs-convert]),
+  [], [enable_btrfsconvert=yes]
+)
+
+AS_IF([test "x$enable_btrfsconvert" = xyes], [DISABLE_BTRFSCONVERT=0], [DISABLE_BTRFSCONVERT=1])
+AC_SUBST([DISABLE_BTRFSCONVERT])
+
 
 dnl Define <NAME>_LIBS= and <NAME>_CFLAGS= by pkg-config
 dnl