diff options
| author | Wang Nan <wangnan0@huawei.com> | 2016-09-26 07:26:56 +0000 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-10-05 19:59:35 -0300 |
| commit | 87095f7ddeff3038a0cf8e6574922f9c11688619 (patch) | |
| tree | 73eb2890678d20f32da70d5f373612e03bd6e509 /tools/build | |
| parent | f61bdc3304281e9ff9eec4f1ed9fb15bcf4d8a5e (diff) | |
| download | linux-87095f7ddeff3038a0cf8e6574922f9c11688619.tar.bz2 | |
tools build: Add feature detection for g++
Check if g++ is available. The result will be used by builtin clang and
LLVM support. Since LLVM requires C++11, this feature detector checks
std::move().
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/1474874832-134786-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/build')
| -rw-r--r-- | tools/build/Makefile.feature | 2 | ||||
| -rw-r--r-- | tools/build/feature/Makefile | 10 | ||||
| -rw-r--r-- | tools/build/feature/test-cxx.cpp | 15 |
3 files changed, 25 insertions, 2 deletions
diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature index a120c6b755a9..ae52e029dd22 100644 --- a/tools/build/Makefile.feature +++ b/tools/build/Makefile.feature @@ -7,7 +7,7 @@ endif feature_check = $(eval $(feature_check_code)) define feature_check_code - feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C $(feature_dir) $(OUTPUT_FEATURES)test-$1.bin >/dev/null 2>/dev/null && echo 1 || echo 0) + feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" CXXFLAGS="$(EXTRA_CXXFLAGS) $(FEATURE_CHECK_CXXFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C $(feature_dir) $(OUTPUT_FEATURES)test-$1.bin >/dev/null 2>/dev/null && echo 1 || echo 0) endef feature_set = $(eval $(feature_set_code)) diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile index a0b29a311816..ac9c477a2a48 100644 --- a/tools/build/feature/Makefile +++ b/tools/build/feature/Makefile @@ -46,11 +46,13 @@ FILES= \ test-lzma.bin \ test-bpf.bin \ test-get_cpuid.bin \ - test-sdt.bin + test-sdt.bin \ + test-cxx.bin FILES := $(addprefix $(OUTPUT),$(FILES)) CC := $(CROSS_COMPILE)gcc -MD +CXX := $(CROSS_COMPILE)g++ -MD PKG_CONFIG := $(CROSS_COMPILE)pkg-config all: $(FILES) @@ -58,6 +60,9 @@ all: $(FILES) __BUILD = $(CC) $(CFLAGS) -Wall -Werror -o $@ $(patsubst %.bin,%.c,$(@F)) $(LDFLAGS) BUILD = $(__BUILD) > $(@:.bin=.make.output) 2>&1 +__BUILDXX = $(CXX) $(CXXFLAGS) -Wall -Werror -o $@ $(patsubst %.bin,%.cpp,$(@F)) $(LDFLAGS) + BUILDXX = $(__BUILDXX) > $(@:.bin=.make.output) 2>&1 + ############################### $(OUTPUT)test-all.bin: @@ -217,6 +222,9 @@ $(OUTPUT)test-bpf.bin: $(OUTPUT)test-sdt.bin: $(BUILD) +$(OUTPUT)test-cxx.bin: + $(BUILDXX) -std=gnu++11 + -include $(OUTPUT)*.d ############################### diff --git a/tools/build/feature/test-cxx.cpp b/tools/build/feature/test-cxx.cpp new file mode 100644 index 000000000000..b1dee9a31d6c --- /dev/null +++ b/tools/build/feature/test-cxx.cpp @@ -0,0 +1,15 @@ +#include <iostream> +#include <memory> + +static void print_str(std::string s) +{ + std::cout << s << std::endl; +} + +int main() +{ + std::string s("Hello World!"); + print_str(std::move(s)); + std::cout << "|" << s << "|" << std::endl; + return 0; +} |