genxml: avoid using a GNU make pattern rule

% pattern rules are a GNU extension.  Convert the use of one to a
inference rule to allow this to build on OpenBSD.

v2: inference rules can't have additional prerequisites so add a target
rule to still depend on gen_pack_header.py

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

diff --git a/src/intel/genxml/Makefile.am b/src/intel/genxml/Makefile.am
index f493d48..0b5b3a6 100644 (file)
--- a/src/intel/genxml/Makefile.am
+++ b/src/intel/genxml/Makefile.am
@@ -28,7 +28,11 @@ BUILT_SOURCES =                                         \
 
 PYTHON3_GEN = $(AM_V_GEN)$(PYTHON3) $(PYTHON_FLAGS)
 
-%_pack.h : %.xml gen_pack_header.py
+SUFFIXES = _pack.h .xml
+
+$(BUILT_SOURCES): gen_pack_header.py
+
+.xml_pack.h:
        $(PYTHON3_GEN) $(srcdir)/gen_pack_header.py $< > $@
 
 CLEANFILES = $(BUILT_SOURCES)