build: make generation of atom-glue compatible with older gcc versions

With old versions, cpp doesn't accept several files as input. See #186.

diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index 250e32a769242eb5b0e9645332b6085e7b22b90f..2a5cdb3e997222ed5f189abf13f23eee1d0853f0 100644 (file)
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -20,8 +20,9 @@ nodist_liblldpctl_la_SOURCES = atom-glue.c
 liblldpctl_la_LIBADD  = $(top_builddir)/src/libcommon-daemon-lib.la libfixedpoint.la
 
 atom-glue.c: $(ATOM_FILES) Makefile
-       $(AM_V_GEN)($(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
-               $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) $(ATOM_FILES:%=$(srcdir)/%) | \
+       $(AM_V_GEN)(for f in $(ATOM_FILES:%=$(srcdir)/%); do \
+               $(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
+               $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) $$f; done | \
                $(SED) -n 's+^void init_atom_builder_\([^(]*\)().*, \([0-9]*\)).*+\2 \1+p' | \
                sort | \
                $(AWK) '{ atoms[$$2] = 1 } \
@@ -30,8 +31,9 @@ atom-glue.c: $(ATOM_FILES) Makefile
                                print " static int init = 0; if (init) return; init++;"; \
                               for (atom in atoms) { print " init_atom_builder_"atom"();" } \
                               print "}"; }' && \
+               for f in $(ATOM_FILES:%=$(srcdir)/%); do \
                $(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
-               $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) $(ATOM_FILES:%=$(srcdir)/%) | \
+               $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) $$f; done | \
                $(SED) -n 's+^void init_atom_map_\([^(]*\)().*, \([0-9]*\)).*+\2 \1+p' | \
                sort -n | \
                $(AWK) '{ atoms[$$2] = 1 } \