tools build: Support compiling C++ source file
Add new rule to compile .cpp file to .o use g++. C++ support is required
for built-in clang and LLVM support.
Linker side support will be introduced by following commits.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1474874832-134786-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/build/Build.include b/tools/build/Build.include
index 0248938..1dcb95e 100644
--- a/tools/build/Build.include
+++ b/tools/build/Build.include
@@ -90,6 +90,7 @@
# - per object C flags
# - BUILD_STR macro to allow '-D"$(variable)"' constructs
c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))
+cxx_flags = -Wp,-MD,$(depfile),-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj))
###
## HOSTCC C flags
diff --git a/tools/build/Makefile.build b/tools/build/Makefile.build
index 190519a..99c0ccd 100644
--- a/tools/build/Makefile.build
+++ b/tools/build/Makefile.build
@@ -61,6 +61,9 @@
quiet_cmd_host_cc_o_c = HOSTCC $@
cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
+quiet_cmd_cxx_o_c = CXX $@
+ cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
+
quiet_cmd_cpp_i_c = CPP $@
cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
@@ -88,6 +91,10 @@
$(call rule_mkdir)
$(call if_changed_dep,$(host)cc_o_c)
+$(OUTPUT)%.o: %.cpp FORCE
+ $(call rule_mkdir)
+ $(call if_changed_dep,cxx_o_c)
+
$(OUTPUT)%.o: %.S FORCE
$(call rule_mkdir)
$(call if_changed_dep,$(host)cc_o_c)