download, build, and test program using libc++

clang-libcxx-test.sh

mkdir ~/projects/test-c11
cd ~/projects/test-c11
svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx
cd libcxx/lib
export CXX=/opt/llvm2/bin/clang++
export CC=/opt/llvm2/bin/clang
export LD=/opt/llvm2/bin/clang
export TRIPLE=-apple-
./buildit
# fix install name id since it is wrongly hardcoded in the build script
install_name_tool -id `pwd`/libc++.1.dylib ./libc++.1.dylib 
# create symlink without version to allow -stdlib=libc++ to work
ln -sf libc++.1.dylib libc++.dylib
cd ../../
# create a test file
echo '#include <iostream>' > test.cpp
echo 'int main() { std::clog << "hello\n"; return 0; }' >> test.cpp
$CXX -std=c++11 -stdlib=libc++ -nostdinc++ -I./libcxx/include -L./libcxx/lib -lc++ -lSystem test.cpp -o test
# this also works for me which adds `-nostdlib` and removes `-stdlib=libc++`
$CXX -std=c++11 -nostdlib -nostdinc++ -I`pwd`/libcxx/include -L`pwd`/libcxx/lib test.cpp -o test -lc++ -lSystem /usr/lib/crt1.o
# and going further this also works which adds `-syslibroot` to point at our cust
# location and then requires manually linking to libSystem
$CXX -std=c++11 -stdlib=libc++ -nostdlib -nostdinc++ -I./libcxx/include -L./libcxx/lib test.cpp -o test -lc++ /usr/lib/crt1.o -Wl,-syslibroot,`pwd`/libcxx/lib -L/usr/lib -lSystem
# ensure it runs
$ ./test
hello
# ensure proper linking
$ otool -L test
test:
  /Users/dane/projects/test-c11/libcxx/lib/libc++.1.dylib (compatibility version 1.0.0, current version 1.0.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.1.0)

@springmeyer - great!

building node.js 0.8.18 with libcxx:

export CC=clang
export RANLIB=clang
export CXX=clang++
export LD=clang
export CFLAGS=""
export LIBCXX=/Users/dane/src/libcxx
export CXXFLAGS="-std=c++11 -nostdinc++ -I${LIBCXX}/include"
export LDFLAGS="-nostdlib -stdlib=libc++  -L${LIBCXX}/lib -lc++ /usr/lib/crt1.o  -lSystem"
./configure --prefix=/opt/node-c11

applied this patch:

--- src/node.cc 2013-01-22 13:22:00.000000000 -0800
+++ src/node.cc 2013-01-22 13:22:03.000000000 -0800
@@ -2983,7 +2983,7 @@

 #ifndef NDEBUG
   // Clean up. Not strictly necessary.
-  V8::Dispose();
+  //V8::Dispose();
 #endif  // NDEBUG

   // Clean up the copy:

then:

make -j8
make test

test results:

make -C out BUILDTYPE=Release V=1
make[1]: Nothing to be done for `all'.
ln -fs out/Release/node node
python tools/test.py --mode=release simple message
=== release test-child-process-customfd-bounded ===                    
Path: simple/test-child-process-customfd-bounded
child_process.js:794
    throw errnoException(errno, 'spawn');
          ^
Error: spawn EMFILE
    at errnoException (child_process.js:847:11)
    at ChildProcess.spawn (child_process.js:794:11)
    at exports.spawn (child_process.js:618:9)
    at Object.exports.spawnPwd (/Users/dane/src/node-v0.8.18/test/common.js:72:12)
    at Object.<anonymous> (/Users/dane/src/node-v0.8.18/test/simple/test-child-process-customfd-bounded.js:29:8)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.runMain (module.js:492:10)
Command: out/Release/node /Users/dane/src/node-v0.8.18/test/simple/test-child-process-customfd-bounded.js
=== release test-memory-usage-emfile ===                                       
Path: simple/test-memory-usage-emfile
fs.js:338
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
                 ^
Error: EMFILE, too many open files '/Users/dane/src/node-v0.8.18/test/simple/test-memory-usage-emfile.js'
    at Object.fs.openSync (fs.js:338:18)
    at Object.<anonymous> (/Users/dane/src/node-v0.8.18/test/simple/test-memory-usage-emfile.js:33:17)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.runMain (module.js:492:10)
    at process.startup.processNextTick.process._tickCallback (node.js:244:9)
Command: out/Release/node /Users/dane/src/node-v0.8.18/test/simple/test-memory-usage-emfile.js
[02:19|% 100|+ 462|-   2]: Done                                                
make: *** [test] Error 1