Build rpcgen-generated files when cross compiling.

1 files changed, 24 insertions, 8 deletions

diff --git a/sunrpc/Makefile b/sunrpc/Makefile
index b4548d5ccd..e61efd02b3 100644
--- a/sunrpc/Makefile
+++ b/sunrpc/Makefile
@@ -97,15 +97,12 @@ ifeq ($(have-thread-library),yes)
 xtests += thrsvc
 endif
 
-ifeq (no,$(cross-compiling))
-# We can only build this library if we can run the rpcgen we build.
 headers += $(rpcsvc:%.x=rpcsvc/%.h)
 extra-libs := librpcsvc
 extra-libs-others := librpcsvc # Make it in `others' pass, not `lib' pass.
 librpcsvc-routines = $(rpcsvc:%.x=x%)
 librpcsvc-inhibit-o = .os # Build no shared rpcsvc library.
 omit-deps = $(librpcsvc-routines)
-endif
 
 ifeq (yes,$(build-shared))
 rpc-compat-routines = $(addprefix compat-,$(need-export-routines))
@@ -143,7 +140,9 @@ CFLAGS-pmap_rmt.c = -fexceptions
 CFLAGS-clnt_perr.c = -fexceptions
 CFLAGS-openchild.c = -fexceptions
 
-CPPFLAGS += -D_RPC_THREAD_SAFE_
+sunrpc-CPPFLAGS = -D_RPC_THREAD_SAFE_
+CPPFLAGS += $(sunrpc-CPPFLAGS)
+BUILD_CPPFLAGS += $(sunrpc-CPPFLAGS)
 
 $(objpfx)tst-getmyaddr: $(common-objpfx)linkobj/libc.so
 $(objpfx)tst-xdrmem: $(common-objpfx)linkobj/libc.so
@@ -151,13 +150,30 @@ $(objpfx)tst-xdrmem2: $(common-objpfx)linkobj/libc.so
 
 $(objpfx)rpcgen: $(addprefix $(objpfx),$(rpcgen-objs))
 
+cross-rpcgen-objs := $(addprefix $(objpfx)cross-,$(rpcgen-objs))
+extra-objs += $(cross-rpcgen-objs)
+
+# When generic makefile support for build system programs is
+# available, it should replace this code.  See
+# <http://sourceware.org/bugzilla/show_bug.cgi?id=14087>.
+$(cross-rpcgen-objs): $(objpfx)cross-%.o: %.c
+	$(make-target-directory)
+	$(BUILD_CC) $($(basename $(<F))-CFLAGS) $(ALL_BUILD_CFLAGS) $< \
+		$(OUTPUT_OPTION) $(compile-mkdep-flags) -c
+
+$(objpfx)cross-rpcgen: $(cross-rpcgen-objs)
+	$(BUILD_CC) $^ $(BUILD_LDFLAGS) -o $@
+
 # This makes sure -DNOT_IN_libc is passed for all these modules.
 cpp-srcs-left := $(rpcgen-objs:.o=.c)
 lib := nonlib
 include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left))
 
-# Tell rpcgen where to find the C preprocessor.
-rpcgen-cmd = CPP='$(CC) -E -x c-header' $(built-program-cmd) -Y ../scripts
+# How we run rpcgen to generate sources and headers in the rules below.
+# Setting CPP tells it how to run the C preprocessor correctly.  Note
+# that $(built-program-file) requires that the just-built cross-rpcgen
+# binary be the second dependency listed in each rule using rpcgen-cmd.
+rpcgen-cmd = CPP='$(CC) -E -x c-header' $(built-program-file) -Y ../scripts
 
 # Install the rpc data base file.
 $(inst_sysconfdir)/rpc: etc.rpc $(+force)
@@ -168,7 +184,7 @@ $(inst_sysconfdir)/rpc: etc.rpc $(+force)
 # relinked.
 $(rpcsvc:%.x=$(objpfx)rpcsvc/%.h): $(objpfx)rpcsvc/%.h: $(objpfx)rpcsvc/%.stmp
 	@:
-$(objpfx)rpcsvc/%.stmp: rpcsvc/%.x $(objpfx)rpcgen
+$(objpfx)rpcsvc/%.stmp: rpcsvc/%.x $(objpfx)cross-rpcgen
 	$(make-target-directory)
 	-@rm -f ${@:stmp=T} $@
 	$(rpcgen-cmd) -h $< -o ${@:stmp=T}
@@ -178,7 +194,7 @@ $(objpfx)rpcsvc/%.stmp: rpcsvc/%.x $(objpfx)rpcgen
 # Generate the rpcsvc XDR functions with rpcgen.
 $(rpcsvc:%.x=$(objpfx)x%.c): $(objpfx)x%.c: $(objpfx)x%.stmp
 	@:
-$(objpfx)x%.stmp: rpcsvc/%.x $(objpfx)rpcgen
+$(objpfx)x%.stmp: rpcsvc/%.x $(objpfx)cross-rpcgen
 	-@rm -f ${@:stmp=T} $@
 	$(rpcgen-cmd) -c $< -o ${@:stmp=T}
 	$(move-if-change) $(@:stmp=T) $(@:stmp=c)