How to build clang/examples/PrintFunctionNames? - build

Question

I need some simple example to start using clang.
I downloaded llvm and clang and built:
mkdir llvm-build
cd llvm-build
../llvm/configure
make
I tried to build PrintFunctionNames from clang examples but got an error message:
../../../../Makefile.common:61: ../../../../Makefile.config: No such file or directory
../../../../Makefile.common:69: /Makefile.rules: No such file or directory
make: * No rule to make target `/Makefile.rules'. Stop.
Readme file says that only make is needed.
So how to build this plugin?

Answer 1

Go into llvm-build/tools/clang, and run "make BUILD_EXAMPLES=1".

Answer 2

Most assuredly you will have your LLVM trunk checkout and under the tools path you have checked out Clang trunk as well [explained under building Clang via http://clang.llvm.org/get_started.html.
Makefile Build Guide: http://llvm.org/docs/MakefileGuide.html
On OS X the build set up is a bit different, but on Debian Linux I'm building it daily as follows:
../trunk/configure --enable-target=x86_64,arm,cpp,cbe --with-built-clang --enable-pic --enable-polly --enable-shared --with-cxx-include-arch=x86_64 --enable-optimized --with-optimize-option=-Os --enable-assertions --disable-bootstrap --disable-multilib --enable-jit --enable-threads --no-create --no-recursion
then applying the make -j (n+1 number of cores) on the command for my Pentium D 945 system:
make [building against autotools make -j (n+1) doesn't always building llvm cleanly as it does against cmake. So if you want to run all cores, expect the possibility of running make -j(n+1) more than once to result in a clean build.
Standard form without accessing multiple cores:
make BUILD_EXAMPLES='1' //Read the note below
always results in a clean build, and if it doesn't report a bug to LLVM.
Note: If you're at the top level you can svn update the llvm trunk, project-test trunk and clang trunk as follows:
make trunk
Then go and run make again now that BUILD_EXAMPLES=1 is configured ahead of time.
make BUILD_EXAMPLES='1'
NOTE: Autotools will allow one to configure the BUILD_EXAMPLES='1' but will ignore the flag when you go to run make if you don't explicitly include BUILD_EXAMPLES='1' after make on the command line.
At the top of the LLVM tree you build against running make BUILD_EXAMPLES='1' will build the LLVM specific examples, then going inside your build/tools/clang path you then must run make BUILD_EXAMPLES='1' again to build the Clang examples.
Hence:
LLVM Top:
make BUILD_EXAMPLES='1' // for LLVM examples
cd tools/clang
make BUILD_EXAMPLES='1' // for Clang specific examples
Verify the examples installing under /usr/local/bin for LLVM and /usr/local/lib/ for Clang.
If you use CMAKE the default location for the binary examples is under /usr/local/examples

Answer 3

I followed the instructions at http://clang.llvm.org/get_started.html with two exceptions:
My build dir is inside the source dir (i.e. cd llvm ; mkdir build), but I don't think it's relevant.
I issued cmake as so :
cd build
cmake -DLLVM_BUILD_EXAMPLES=1 -DCLANG_BUILD_EXAMPLES=1 ..
After that (and compiling of course (make -j8)) I could find the examples in the build dir :
find -iname '*printfunctionname*'
./lib/PrintFunctionNames.so
...

Answer 4

I tried to do something similar yesterday: get a list of methods in a class using clang and succeeded. Maybe my post helps here also. My best help was this AST Matchers tutorial.