zfcpdbf: test-compile the script during the build using perl -c

For a slightly easier development loop add a pseudo compilation of the
zfcpdbf Perl script. This will run the Perl interpreter in syntax-check
mode:

  -c   causes Perl to check the syntax of the program and then exit
       without executing it.  Actually, it will execute any "BEGIN",
       "UNITCHECK", or "CHECK" blocks and any "use" statements: these are
       considered as occurring outside the execution of your program.
       "INIT" and "END" blocks, however, will be skipped.

Additionally add the `-w` switch when the Make variable `W` is `1`. This
will print additional warnings about dubious constructs (according to
Perl).

So this pseudo compilation only happens whenever the script is changed
during development create a file `.zfcpdbf.ct` as a result so we can
describe the relationship and dependency in Make. This file can be ignored
otherwise.

Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

scripts/.gitignore

@@ -0,0 +1 @@
+/.zfcpdbf.ct

scripts/Makefile

@@ -36,4 +36,21 @@ install:
 
 clean:
 
+.zfcpdbf.ct: zfcpdbf
+	$(PERLC) $(ALL_PERLCFLAGS) zfcpdbf 2>$(@);			\
+	if [ "$${?}" -ne 0 ]; then					\
+		cat "$(@)" >&2 && rm "$(@)";				\
+	elif [ "$$(cat '$(@)' | wc -l)" -gt 1 ]; then			\
+		cat "$(@)" >&2;						\
+	elif [ " $(V)" = " 1" ]; then					\
+		cat "$(@)";						\
+	fi
+
+.PHONY: .zfcpdbf.ct-clean
+.zfcpdbf.ct-clean:
+	rm -f .zfcpdbf.ct
+
+all: .zfcpdbf.ct
+clean: .zfcpdbf.ct-clean
+
 .PHONY: all install clean