Run gperf with --output-file instead of output redirection

When missing gperf, the redirection generates an empty file, which must
be manually removed after gperf has been installed. This is difficult
to diagnose, as the produced build error is cryptic.

Use --output-file of gperf instead to avoid creating an empty file if
gperf is missing. This still requires the user to re-run ./configure
after installing gperf, though.

diff --git a/src/libstrongswan/Makefile.am b/src/libstrongswan/Makefile.am
index 827e0ad..db8e9c2 100644 (file)
--- a/src/libstrongswan/Makefile.am
+++ b/src/libstrongswan/Makefile.am
@@ -236,8 +236,8 @@ $(srcdir)/crypto/proposal/proposal_keywords_static.h: $(srcdir)/crypto/proposal/
 $(srcdir)/crypto/proposal/proposal_keywords_static.c:  $(srcdir)/crypto/proposal/proposal_keywords_static.txt \
                                                                                                                $(srcdir)/crypto/proposal/proposal_keywords_static.h
                $(AM_V_GEN) \
-               $(GPERF) -N proposal_get_token_static -m 10 -C -G -c -t -D < \
-                                                                                               $(srcdir)/crypto/proposal/proposal_keywords_static.txt > $@
+               $(GPERF) -N proposal_get_token_static -m 10 -C -G -c -t -D \
+                       --output-file=$@ $<
 
 if STATIC_PLUGIN_CONSTRUCTORS
 BUILT_SOURCES += $(srcdir)/plugin_constructors.c

diff --git a/src/starter/Makefile.am b/src/starter/Makefile.am
index 759d179..1dc656f 100644 (file)
--- a/src/starter/Makefile.am
+++ b/src/starter/Makefile.am
@@ -54,7 +54,8 @@ keywords.h: $(srcdir)/keywords.h.in
 
 keywords.c:    $(srcdir)/keywords.txt keywords.h
                $(AM_V_GEN) \
-               $(GPERF) -m 10 -C -G -D -t < $(srcdir)/keywords.txt > $@
+               $(GPERF) -m 10 -C -G -D -t \
+                       --output-file=$@ $<
 
 install-exec-local :
                test -e "$(DESTDIR)${sysconfdir}/ipsec.d" || $(INSTALL) -d "$(DESTDIR)$(sysconfdir)/ipsec.d" || true

diff --git a/src/stroke/Makefile.am b/src/stroke/Makefile.am
index 5c04b5a..3b7c465 100644 (file)
--- a/src/stroke/Makefile.am
+++ b/src/stroke/Makefile.am
@@ -19,4 +19,5 @@ stroke_keywords.h: $(srcdir)/stroke_keywords.h.in
 
 stroke_keywords.c:     $(srcdir)/stroke_keywords.txt stroke_keywords.h
                $(AM_V_GEN) \
-               $(GPERF) -m 10 -D -C -G -t < $(srcdir)/stroke_keywords.txt > $@
+               $(GPERF) -m 10 -D -C -G -t \
+                       --output-file=$@ $<