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authorWang Nan <wangnan0@huawei.com>2016-11-26 07:03:32 +0000
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-12-05 15:51:43 -0300
commitc7fb4f62e2a97bd25d555263ef501fe053edcbb6 (patch)
tree5a376a0071de175056029fe799bc8914526a60d2 /tools/build
parentcb40d55b595cd117ef7c1880247605875b2115e8 (diff)
downloadlinux-c7fb4f62e2a97bd25d555263ef501fe053edcbb6.tar.bz2
tools build: Add feature detection for clang
Check if basic clang compiling environment is ready. Doesn't like 'llvm-config --libs' which can returns llvm libraries in right order and duplicates some libraries if necessary, there's no correspondence for clang libraries (-lclangxxx). to avoid extra complexity and to avoid new clang breaking libraries ordering, use --start-group and --end-group. In this test case, manually identify required clang libs and hope it to be stable. Putting all clang libraries here is possible (use make's wildcard), but then feature checking becomes very slow. 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: Joe Stringer <joe@ovn.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-9-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/build')
-rw-r--r--tools/build/feature/Makefile10
-rw-r--r--tools/build/feature/test-clang.cpp21
2 files changed, 31 insertions, 0 deletions
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index c09de59affc9..871d5536951d 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -237,6 +237,16 @@ $(OUTPUT)test-llvm.bin:
$(shell $(LLVM_CONFIG) --libs Core BPF) \
$(shell $(LLVM_CONFIG) --system-libs)
+$(OUTPUT)test-clang.bin:
+ $(BUILDXX) -std=gnu++11 \
+ -I$(shell $(LLVM_CONFIG) --includedir) \
+ -L$(shell $(LLVM_CONFIG) --libdir) \
+ -Wl,--start-group -lclangBasic -lclangDriver \
+ -lclangFrontend -lclangEdit -lclangLex \
+ -lclangAST -Wl,--end-group \
+ $(shell $(LLVM_CONFIG) --libs Core option) \
+ $(shell $(LLVM_CONFIG) --system-libs)
+
-include $(OUTPUT)*.d
###############################
diff --git a/tools/build/feature/test-clang.cpp b/tools/build/feature/test-clang.cpp
new file mode 100644
index 000000000000..e23c1b1f1b91
--- /dev/null
+++ b/tools/build/feature/test-clang.cpp
@@ -0,0 +1,21 @@
+#include "clang/Basic/VirtualFileSystem.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+using namespace clang::driver;
+
+int main()
+{
+ IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
+ IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
+
+ DiagnosticsEngine Diags(DiagID, &*DiagOpts);
+ Driver TheDriver("test", "bpf-pc-linux", Diags);
+
+ llvm::llvm_shutdown();
+ return 0;
+}