Build problem

[mdole]

I'm trying to build llvm/clang using the instructions provided (and I've tried using make instead of cmake), and I'm getting nothing but errors. I think the problem is in the compiler-rt section, as the errors are always in its subdirectories. The exact errors vary depending on which method I use to build--sometimes it can't find certain files, sometimes it doesn't recognize a flag, etc. Can anyone help me out? I'm happy to provide more detailed information if that would be useful.

Thanks!

[azhang7]

What OS are you building on? Can you post the full output of cmake followed by make (maybe as a Gist)?

[mdole]

I'm working on Linux. Sure! Give me a few minutes.

[mdole]

Ok, here's the exact steps I took plus the Gist (beginning in $HOME):

1. git clone -b cilkplus https://github.com/cilkplus/llvm
2. git clone -b cilkplus https://github.com/cilkplus/clang llvm/tools/clang
3. git clone -b cilkplus https://github.com/cilkplus/compiler-rt llvm/projects/compiler-rt
4. cd llvm
5. mkdir build && cd build
6. cmake -DCMAKE_INSTALL_PREFIX=$HOME/llvm-cilkplus -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=X86 ..
   Gist w/ cmake output: https://gist.github.com/mdole/8d36893d45cb6ad4b4fe
   I can't make at this stage (at least, not from the build directory) because no makefile is present. So I tried the following:
7. ../configure --enable-optimization
8. make -j8 > make_output.txt 2>&1
   Gist w/ make output: https://gist.github.com/mdole/d92d188910f05c3dd7f9

Thoughts?

[azhang7]

Did you build CMake yourself? I've never tried version 3 of CMake before but it looks like there's some changes that make it incompatible with how our CMake files are written. Try version 2.8 if possible.

Alternatively, if you want to use configure+make, remove the references to '-Werror' (just -Werror, not the entire line they appear on) in the .mk files in projects/compiler-rt/make/ and projects/compiler-rt/make/platform and it should build.

[mdole]

I did build cmake. I'll try v2.8 and see if that works first, and if it doesn't, I'll check out the -Werror idea. Thanks again, and I'll let you know what happens.

[mdole]

One other question: after running cmake with an older version (I'm trying 2.8.12.2), should the makefile be created in build? Or will I still have to configure?

[azhang7]

CMake will generate Makefiles. configure is the other build system (autoconf). So don't run configure after running cmake.

[mdole]

Ok, that's what I thought. Even with the older cmake, the makefiles still aren't being made, and it's throwing the same error as before about not being able to find BasicBlockPlacement.cpp. I also tried removing the -Werrors, and using configure and make, and was met with this error:
make/platform/clang_linux.mk:16: *** "unable to infer compiler target triple for /export/shakespeare/home/dolem/llvm/build/Release+Asserts/bin/clang". Stop.
Anything else I can try?

[azhang7]

What does:
$(CC) -v

produce? I'm guessing your compiler is gcc. I assume you cleaned out the build directory after editing the .mk files and switching between cmake and autoconf.

[mdole]

Yeah, I removed and remade build. I didn't undo the edits to the .mk files though; should I have? $CC is currently undefined, but I either use gcc or g++. I just set it (and CXX) with
export CC=/export/shakespeare/home/dolem/gcc-cilk/bin/gcc:$CC
export CXX=/export/shakespeare/home/dolem/gcc-cilk/bin/g++:$CXX
Now when I cmake I get the following:
Could not find compiler set in environment variable CXX:

/export/shakespeare/home/dolem/gcc-cilk/bin/g++:.

Call Stack (most recent call first):
CMakeLists.txt:3 (project)

CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
Missing variable is:
CMAKE_CXX_COMPILER_ENV_VAR
CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
Missing variable is:
CMAKE_CXX_COMPILER
CMake Error: Could not find cmake module file: /export/shakespeare/home/dolem/llvm/build/CMakeFiles/2.8.12.2/CMakeCXXCompiler.cmake
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!
See also "/export/shakespeare/home/dolem/llvm/build/CMakeFiles/CMakeOutput.log".

Maybe I need to make sure I built cmake properly. I'll give that a shot.

[azhang7]

$CC doesn't work like that. It's the command to use for invoking the C compiler, so you can't give it a list. Anyway, I meant run 'gcc -v' because that's what the autoconf file does before giving the error about not being able to infer the compiler triple. For gcc, I've only ever tried version 4.6 and 4.7 so I thought maybe there was something strange with the 4.4 output of -v.

Don't set CC and CXX before running cmake. It'll figure out your system defaults on its own. (You also don't have a binary called gcc in your llvm build dir/bin)

Leave the edits to the .mk files. It should stop the error about the unused variable in asan or whatever the other compiler-rt project was.

[azhang7]

Also, what distro of Linux are you running?

[avt77]

I'm using make and have no any problems except the one: I can't build
cilkplus runtime library (there are some problems with tools' versions).
Because of that I commented out the cilk folder in
.../projects/compiler-rt/lib/Makefile.mk:

#SubDirs += cilk

Without this folder everything works fine for me.

2014-07-09 20:57 GMT+04:00 Matt Dole notifications@github.com:

I'm trying to build llvm/clang using the instructions provided (and I've
tried using make instead of cmake), and I'm getting nothing but errors. I
think the problem is in the compiler-rt section, as the errors are always
in its subdirectories. The exact errors vary depending on which method I
use to build--sometimes it can't find certain files, sometimes it doesn't
recognize a flag, etc. Can anyone help me out? I'm happy to provide more
detailed information if that would be useful.

Thanks!

—
Reply to this email directly or view it on GitHub
#13.

[mdole]

azhang--I'm on redhat. I'm using the version of gcc that comes with cilkplus; gcc -v produces version 4.9.0. Also, I configured it with --disable-multilib if that matters at all. I'll try switching my compiler to the stock gcc and see if that makes a difference (the default on my system is 4.8.2).

atv--Unfortunately, the cilkplus runtime library is the one I need. I'm building this to use with a cilk profiling tool. I tried doing a basic llvm build, and that worked fine, so I'm probably having a similar problem.

[azhang7]

mdole -- Try going back to commit 635b68f in clang, 61a84fd533 in llvm. Those were the last versions I worked on and I'm almost 100% certain that should build like the instructions on the Github page say.

Unfortunately, CilkPlus/LLVM doesn't support cilk-specific profiling tools afaik. Perhaps someone on the current team can correct me if that's changed.

If you can build the compiler without the compiler-rt project, you may want to just grab the official Intel Cilk Plus runtime from https://www.cilkplus.org/download#runtime-sources. We use the exact same code, but changed the build system to conform to LLVM's.