Makefile.PL: "dsyn" target to check syntax of changed files

We have lots of files and syntax-checking every single one of
them is slow.  Enable "perl -w" in the existing syntax check
while we're at it.

diff --git a/Makefile.PL b/Makefile.PL
index 341d42afcc74fa2e51d52be60838e29ea74e3c97..113f8c776cd2ad7248753724db89bba247fc301d 100644 (file)
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -70,14 +70,17 @@ N = \$\$(( \$\$(nproc 2>/dev/null || gnproc 2>/dev/null || echo 2) + 1 ))
 -include config.mak
 -include Documentation/include.mk
 SCRIPTS := scripts/ssoma-replay
-my_syntax := \$(addsuffix .syntax, $PM_FILES \$(EXE_FILES) \$(SCRIPTS))
-
+syn_files := $PM_FILES \$(EXE_FILES) \$(SCRIPTS)
+my_syntax := \$(addsuffix .syntax, \$(syn_files))
+changed = \$(shell git ls-files -m)
 
 %.syntax ::
-       @\$(PERL) -I lib -c \$(subst .syntax,,\$@)
+       @\$(PERL) -w -I lib -c \$(subst .syntax,,\$@)
 
 syntax:: \$(my_syntax)
 
+dsyn :: \$(addsuffix .syntax, \$(filter \$(changed), \$(syn_files)))
+
 check-manifest :: MANIFEST
        if git ls-files >\$?.gen 2>&1; then diff -u \$? \$?.gen; fi