[Qemu-devel] [RFC 2/4] rules.mak: support C++ compiling and linking

[Claudio Fontana <claudio.fontana@huawei.com>]

support compilation of .cc and .cpp files,
and if C++ is enabled always link with C++ in the non-libtool case.

Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org>
---
 rules.mak | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/rules.mak b/rules.mak
index 4499745..d2f1b1f 100644
--- a/rules.mak
+++ b/rules.mak
@@ -8,9 +8,14 @@ MAKEFLAGS += -rR
 %.d:
 %.h:
 %.c:
+%.cc:
+%.cpp:
 %.m:
 %.mak:
 
+# Flags for C++ compilation
+QEMU_CXXFLAGS = -D__STDC_LIMIT_MACROS $(filter-out -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wold-style-declaration -Wold-style-definition -Wredundant-decls, $(QEMU_CFLAGS))
+
 # Flags for dependency generation
 QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(*D)/$(*F).d
 
@@ -21,11 +26,21 @@ QEMU_INCLUDES += -I$(<D) -I$(@D)
 	$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<,"  CC    $(TARGET_DIR)$@")
 %.o: %.rc
 	$(call quiet-command,$(WINDRES) -I. -o $@ $<,"  RC    $(TARGET_DIR)$@")
+%.o: %.cc
+	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CXXFLAGS) -c -o $@ $<, "  CXX    $(TARGET_DIR)$@")
+%.o: %.cpp
+	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CXXFLAGS) -c -o $@ $<, "  CXX    $(TARGET_DIR)$@")
 
 ifeq ($(LIBTOOL),)
-LINK = $(call quiet-command,$(CC) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
-       $(sort $(filter %.o, $1)) $(filter-out %.o, $1) $(version-obj-y) \
-       $(LIBS),"  LINK  $(TARGET_DIR)$@")
+  ifeq ($(CXX),)
+  LINK = $(call quiet-command,$(CC) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
+         $(sort $(filter %.o, $1)) $(filter-out %.o, $1) $(version-obj-y) \
+         $(LIBS),"  LINK  $(TARGET_DIR)$@")
+  else
+  LINK = $(call quiet-command,$(CXX) $(QEMU_CXXFLAGS) $(CXXFLAGS) $(LDFLAGS) -o $@ \
+         $(sort $(filter %.o, $1)) $(filter-out %.o, $1) $(version-obj-y) \
+         $(LIBS),"  LINK  $(TARGET_DIR)$@")
+  endif
 else
 LIBTOOL += $(if $(V),,--quiet)
 %.lo: %.c
@@ -70,7 +85,8 @@ quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
 cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
               >/dev/null 2>&1 && echo OK), $2, $3)
 
-VPATH_SUFFIXES = %.c %.h %.S %.m %.mak %.texi %.sh %.rc
+VPATH_SUFFIXES = %.c %.h %.S %.cpp %.cc %.m %.mak %.texi %.sh %.rc
+
 set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
 
 # find-in-path
-- 
1.8.1