[tip:perf/urgent] tools build: Support compiling C++ source file

[tip-bot for Wang Nan]

Commit-ID:  f61bdc3304281e9ff9eec4f1ed9fb15bcf4d8a5e
Gitweb:     http://git.kernel.org/tip/f61bdc3304281e9ff9eec4f1ed9fb15bcf4d8a5e
Author:     Wang Nan <wangnan0@xxxxxxxxxx>
AuthorDate: Mon, 26 Sep 2016 07:26:55 +0000
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 5 Oct 2016 19:58:51 -0300

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@xxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxx>
Cc: He Kuang <hekuang@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Zefan Li <lizefan@xxxxxxxxxx>
Cc: pi3orama@xxxxxxx
Link: http://lkml.kernel.org/r/1474874832-134786-2-git-send-email-wangnan0@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/build/Build.include  | 1 +
 tools/build/Makefile.build | 7 +++++++
 2 files changed, 8 insertions(+)

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 @@ if_changed = $(if $(strip $(any-prereq) $(arg-check)),             \
 # - per object C flags
 # - BUILD_STR macro to allow '-D"$(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_cc_o_c = CC       $@
 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 @@ $(OUTPUT)%.o: %.c FORCE
 	$(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)