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    Subject[PATCH 11/34] tools build: Add feature detection for LLVM
    Date
    Check if basic LLVM compiling environment is ready.

    Use llvm-config to detect include and library directories. Avoid using
    'llvm-config --cxxflags' because its result contain some unwanted flags
    like --sysroot (if LLVM is built by yocto).

    Use '?=' to set LLVM_CONFIG, so explicitly passing LLVM_CONFIG to make
    would override it.

    Use 'llvm-config --libs BPF' to check if BPF backend is compiled in.
    Since now BPF bytecode is the only required backend, no need to waste
    time linking llvm and clang if BPF backend is missing. This also
    introduce an implicit requirement that LLVM should be new enough. Old
    LLVM doesn't support BPF backend.

    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/1474874832-134786-4-git-send-email-wangnan0@huawei.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/build/feature/Makefile | 8 ++++++++
    tools/build/feature/test-llvm.cpp | 8 ++++++++
    2 files changed, 16 insertions(+)
    create mode 100644 tools/build/feature/test-llvm.cpp

    diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
    index 8f668bc..c09de59 100644
    --- a/tools/build/feature/Makefile
    +++ b/tools/build/feature/Makefile
    @@ -55,6 +55,7 @@ FILES := $(addprefix $(OUTPUT),$(FILES))
    CC := $(CROSS_COMPILE)gcc -MD
    CXX := $(CROSS_COMPILE)g++ -MD
    PKG_CONFIG := $(CROSS_COMPILE)pkg-config
    +LLVM_CONFIG ?= llvm-config

    all: $(FILES)

    @@ -229,6 +230,13 @@ $(OUTPUT)test-cxx.bin:
    $(OUTPUT)test-jvmti.bin:
    $(BUILD)

    +$(OUTPUT)test-llvm.bin:
    + $(BUILDXX) -std=gnu++11 \
    + -I$(shell $(LLVM_CONFIG) --includedir) \
    + -L$(shell $(LLVM_CONFIG) --libdir) \
    + $(shell $(LLVM_CONFIG) --libs Core BPF) \
    + $(shell $(LLVM_CONFIG) --system-libs)
    +
    -include $(OUTPUT)*.d

    ###############################
    diff --git a/tools/build/feature/test-llvm.cpp b/tools/build/feature/test-llvm.cpp
    new file mode 100644
    index 0000000..d8d2cee
    --- /dev/null
    +++ b/tools/build/feature/test-llvm.cpp
    @@ -0,0 +1,8 @@
    +#include "llvm/Support/ManagedStatic.h"
    +#include "llvm/Support/raw_ostream.h"
    +int main()
    +{
    + llvm::errs() << "Hello World!\n";
    + llvm::llvm_shutdown();
    + return 0;
    +}
    --
    2.10.1
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