[libc++] Running tests from cmake?

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[libc++] Running tests from cmake?

David Chisnall-2
Hi,

I've been working on the FreeBSD port of libc++, and have now finished implementing all of the xlocale APIs that libc++ requires, but I haven't been able to run the test suite.  There doesn't seem to be any documentation on building with cmake, but I presumed that make check would work after the build.  It definitely does something, but it dies with:

import pkgutil # precompiled from /usr/local/lib/python2.7/pkgutil.pyc
/usr/local/bin/python2.7: can't find '__main__' module in '/root/libcxx/build/test'

Has anyone else ever tried this, and if so (how) did you make it work?

David
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Re: [libc++] Running tests from cmake?

Howard Hinnant
On Sep 19, 2011, at 7:49 AM, David Chisnall wrote:

> Hi,
>
> I've been working on the FreeBSD port of libc++, and have now finished implementing all of the xlocale APIs that libc++ requires, but I haven't been able to run the test suite.  There doesn't seem to be any documentation on building with cmake, but I presumed that make check would work after the build.  It definitely does something, but it dies with:
>
> import pkgutil # precompiled from /usr/local/lib/python2.7/pkgutil.pyc
> /usr/local/bin/python2.7: can't find '__main__' module in '/root/libcxx/build/test'
>
> Has anyone else ever tried this, and if so (how) did you make it work?
>
> David
> _______________________________________________
> cfe-dev mailing list
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Hi David,

Great news about your porting work!

I don't know anything about the cmake build system.  But since make check obviously isn't doing what you want it to, I thought it might be helpful to tell you how the test system works outside of cmake so that you might better be able to get make check working.

There's a shell script in the test directory called testit.  Running this shell script should recursively walk through the test directory running all tests it finds.  Tests that end in *.pass.cpp are expected to pass.   Tests that end in *.fail.cpp are expected to fail.  You can run testit from any subdirectory under test/ to run a subset of the suite.

Howard

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Re: [libc++] Running tests from cmake?

OKUMURA Yuki
In reply to this post by David Chisnall-2
2011/9/19 David Chisnall <[hidden email]>:
> Hi,
>
> I've been working on the FreeBSD port of libc++, and have now finished implementing all of the xlocale APIs that libc++ requires

Wow

> , but I haven't been able to run the test suite.  There doesn't seem to be any documentation on building with cmake, but I presumed that make check would work after the build.  It definitely does something, but it dies with:
>
> import pkgutil # precompiled from /usr/local/lib/python2.7/pkgutil.pyc
> /usr/local/bin/python2.7: can't find '__main__' module in '/root/libcxx/build/test'
>
> Has anyone else ever tried this, and if so (how) did you make it work?

At I did something before (at
https://github.com/okuoku/bsd-cxx-runtime ), IIRC, CMake didn't set
proper lit.py path for it.
So if you like to use lit.py to testing the build:

1) checkout llvm and specify its utils/lit/lit.py fullpath for libc++
CMake configuration (as -DLIT_EXECUTABLE=/PATH/TO/utils/lit/lit.py)
2) Arrange libc++ test/lit.cfg to add FreeBSD configuration (like:
https://github.com/okuoku/libcxx/commit/abcfa43d5e6360dc311db63320a9d940e0c21ed1#diff-11
)

Good luck!
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Re: [libc++] Running tests from cmake?

Ruben Van Boxem

Op 19 sep. 2011 16:28 schreef "OKUMURA Yuki" <[hidden email]> het volgende:
>
> 2011/9/19 David Chisnall <[hidden email]>:
> > Hi,
> >
> > I've been working on the FreeBSD port of libc++, and have now finished implementing all of the xlocale APIs that libc++ requires

How applicable is that BSD code to, say, Windows?

Ruben

>
> Wow
>
> > , but I haven't been able to run the test suite.  There doesn't seem to be any documentation on building with cmake, but I presumed that make check would work after the build.  It definitely does something, but it dies with:
> >
> > import pkgutil # precompiled from /usr/local/lib/python2.7/pkgutil.pyc
> > /usr/local/bin/python2.7: can't find '__main__' module in '/root/libcxx/build/test'
> >
> > Has anyone else ever tried this, and if so (how) did you make it work?
>
> At I did something before (at
> https://github.com/okuoku/bsd-cxx-runtime ), IIRC, CMake didn't set
> proper lit.py path for it.
> So if you like to use lit.py to testing the build:
>
> 1) checkout llvm and specify its utils/lit/lit.py fullpath for libc++
> CMake configuration (as -DLIT_EXECUTABLE=/PATH/TO/utils/lit/lit.py)
> 2) Arrange libc++ test/lit.cfg to add FreeBSD configuration (like:
> https://github.com/okuoku/libcxx/commit/abcfa43d5e6360dc311db63320a9d940e0c21ed1#diff-11
> )
>
> Good luck!
> _______________________________________________
> cfe-dev mailing list
> [hidden email]
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev


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Re: [libc++] Running tests from cmake?

David Chisnall
On 19 Sep 2011, at 16:14, Ruben Van Boxem wrote:

> > > I've been working on the FreeBSD port of libc++, and have now finished implementing all of the xlocale APIs that libc++ requires
>
> How applicable is that BSD code to, say, Windows?

Unless someone wants to port FreeBSD libc to Windows... not very.  It's pretty deeply interwoven with standard libc functionality, so it would be very difficult to extract it as a stand-alone library.

David

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Re: [libc++] Running tests from cmake?

Ruben Van Boxem
2011/9/19 David Chisnall <[hidden email]>
On 19 Sep 2011, at 16:14, Ruben Van Boxem wrote:

> > > I've been working on the FreeBSD port of libc++, and have now finished implementing all of the xlocale APIs that libc++ requires
>
> How applicable is that BSD code to, say, Windows?

Unless someone wants to port FreeBSD libc to Windows... not very.  It's pretty deeply interwoven with standard libc functionality, so it would be very difficult to extract it as a stand-alone library.

So if I understand what you did correctly, you implemented some/most of the functions listed here:
http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/xlocale.3.html

And then libc++ locale stuff works? Anything else that might be necessary and unpresent on win32?
 

David

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Re: [libc++] Running tests from cmake?

David Chisnall-2
On 19 Sep 2011, at 17:14, Ruben Van Boxem wrote:

> 2011/9/19 David Chisnall <[hidden email]>
> On 19 Sep 2011, at 16:14, Ruben Van Boxem wrote:
>
> > > > I've been working on the FreeBSD port of libc++, and have now finished implementing all of the xlocale APIs that libc++ requires
> >
> > How applicable is that BSD code to, say, Windows?
>
> Unless someone wants to port FreeBSD libc to Windows... not very.  It's pretty deeply interwoven with standard libc functionality, so it would be very difficult to extract it as a stand-alone library.
>
> So if I understand what you did correctly, you implemented some/most of the functions listed here:
> http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/xlocale.3.html

Yes.

> And then libc++ locale stuff works?

Well, it compiles.  Once I've got the tests working, I'll know if it works, but I want to add a couple of things to libcxxrt to support exception_ptr and tweak libc++ to be able to use libcxxrt easily before I get that far.

> Anything else that might be necessary and unpresent on win32?

Well, exceptions are a very platform-specific, they'd likely need a lot of work to run on Win32.  I'd be more inclined to look at Win64, since it has a vaguely sane EH ABI (win32 has 3, mutually incompatible, EH ABIs, none of which is even approximately sane).

I also had to add some stubs to FreeBSD's libm[1], since it lacks a lot of the long double variants of functions that were added with C99.  Since Windows doesn't come with a C99 implementation, I wouldn't be surprised if these were missing there too, although a quick look on MSDN indicates that they do.  

Those were the only two places where libc++ didn't work out of the box on FreeBSD.  That doesn't necessarily mean anything for porting to other platforms though - there's very little divergence between Darwin and FreeBSD userlands, so code is generally easier to port between the two than between any other pair of operating systems.

David

[1] Any Apple people: it would be really great if Darwin's libm could be BSD, MIT, or UIUC licensed - these functions are present (and look to be quite nicely optimised) in the Darwin version, but Apple's slapped an APSL on them so we can't use them.
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Re: [libc++] Running tests from cmake?

David Chisnall-2
In reply to this post by Howard Hinnant
Thanks to many helpful off-list emails from Howard and others, I now have a working port of libc++, running on top of libcxxrt on FreeBSD, giving us (I think) a completely GNU-free C++ stack.  For the moment, we actually have more tests passing on FreeBSD than Darwin, although I'm sure that won't last for long.  

Many thanks to everyone who helped make this possible,

David

On 19 Sep 2011, at 14:13, Howard Hinnant wrote:

> On Sep 19, 2011, at 7:49 AM, David Chisnall wrote:
>
>> Hi,
>>
>> I've been working on the FreeBSD port of libc++, and have now finished implementing all of the xlocale APIs that libc++ requires, but I haven't been able to run the test suite.  There doesn't seem to be any documentation on building with cmake, but I presumed that make check would work after the build.  It definitely does something, but it dies with:
>>
>> import pkgutil # precompiled from /usr/local/lib/python2.7/pkgutil.pyc
>> /usr/local/bin/python2.7: can't find '__main__' module in '/root/libcxx/build/test'
>>
>> Has anyone else ever tried this, and if so (how) did you make it work?
>>
>> David
>> _______________________________________________
>> cfe-dev mailing list
>> [hidden email]
>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
> Hi David,
>
> Great news about your porting work!
>
> I don't know anything about the cmake build system.  But since make check obviously isn't doing what you want it to, I thought it might be helpful to tell you how the test system works outside of cmake so that you might better be able to get make check working.
>
> There's a shell script in the test directory called testit.  Running this shell script should recursively walk through the test directory running all tests it finds.  Tests that end in *.pass.cpp are expected to pass.   Tests that end in *.fail.cpp are expected to fail.  You can run testit from any subdirectory under test/ to run a subset of the suite.
>
> Howard
>


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Re: [libc++] Running tests from cmake?

Marshall Clow
On Sep 21, 2011, at 12:32 PM, David Chisnall wrote:

> Thanks to many helpful off-list emails from Howard and others, I now have a working port of libc++, running on top of libcxxrt on FreeBSD, giving us (I think) a completely GNU-free C++ stack.  For the moment, we actually have more tests passing on FreeBSD than Darwin, although I'm sure that won't last for long.  
>
> Many thanks to everyone who helped make this possible,

Congratulations!

Is there a write-up of what you've done somewhere (or is this planned)?

Thanks in advance!

-- Marshall

Marshall Clow     Idio Software   <mailto:[hidden email]>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki


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Re: [libc++] Running tests from cmake?

David Chisnall-2
On 21 Sep 2011, at 21:30, Marshall Clow wrote:

> On Sep 21, 2011, at 12:32 PM, David Chisnall wrote:
>
>> Thanks to many helpful off-list emails from Howard and others, I now have a working port of libc++, running on top of libcxxrt on FreeBSD, giving us (I think) a completely GNU-free C++ stack.  For the moment, we actually have more tests passing on FreeBSD than Darwin, although I'm sure that won't last for long.  
>>
>> Many thanks to everyone who helped make this possible,
>
> Congratulations!
>
> Is there a write-up of what you've done somewhere (or is this planned)?

There isn't, aside from a blog entry that the FreeBSD Foundation will be publishing soon, but I'm happy to answer any questions or write something up if you want some more details.  The FreeBSD patch is still pending code review, but you can get it here:

http://lists.freebsd.org/pipermail/freebsd-hackers/attachments/20110921/ef9d8701/xlocale-0001.obj

The changes to libc++ and libcxxrt are committed already.  

The main changes to FreeBSD involved implementing the xlocale APIs.  These are Apple extensions to the POSIX2008 per-thread locale APIs which provide _l suffixed versions of all of the locale-aware C functions that take an explicit locale as an argument.  libc++ uses these extensively[1] for the locale support.  The remaining changes were mostly fixing things where FreeBSD hid C99 declarations in C++ mode (these are mostly now visible in C++11 mode).  I also needed to fix a few bugs in FreeBSD libc.  For example, one of Howard's tests showed me that wcstod() and wcstold() returned the wrong value for strings with leading spaces.

In libcxxrt, we've now got a small set of functions for supporting exception_ptr.  These are more or less the same as the ones proposed by Sebastian Redl as extensions to the CodeSourcery Itanium C++ ABI.  The libc++ exception_ptr tests, in conjunction with valgrind, were very helpful in debugging this.  

There's a small amount of overlap between libc++ and libcxxrt (e.g. std::set_unexpected() and friends), so I added some conditional compilation to prevent libc++ from compiling these if you're compiling it for use with libcxxrt.  These might be better off as weak symbols in libc++ so that they're simply ignored if you link against libcxxrt.  Apple's libcxxabi places the layers in slightly different places.  

There wasn't much needed in libc++ beyond a little tweaking and some test fixes (some of the tests were checking implementation details of Darwin, and a few were testing the wrong thing.  For example, a few were comparing C++ strings containing NULL characters against ones constructed from C string literals - I fixed some of these, Howard fixed the rest).  A few of the code paths in libc++ hadn't been tested.  For example, converting a double to a string was done by calling asprintf... without passing the double as an argument.  There's still a code path in locale.cpp that's broken on non-Darwin, non-FreeBSD libc implementations (I added a FIXME, but I haven't fixed it).  Most of my changes were in r140245, which is a pretty small commit.  The 'port' was more a case of implementing the features that libc++ wanted, rather than modifying libc++ to work with the existing features.  

I'm currently testing libc++ for STL, libcxxrt for the ABI layer, and libgcc_s for the generic unwind code.  Roman Divacky and others at PathScale have built a replacement for this using libunwind and compiler-rt.  This is working with PathScale's C++ stack, based on Apache libstdcxx, so I don't expect any problems dropping it into this stack - but that's for Roman to do when my FreeBSD changes are committed.  So, we have all of the pieces for a completely open C++ stack and GNU ld is, I think, the last big stumbling block for a GPL-free FreeBSD 10.

David

[1] It also seems to call newlocale a lot more than it needs to - a call to std::locale() calls newlocale() 8 times, when it should only need to call it once and maybe duplocale() (which is a lot cheaper) a few times.  

P.S. I hope you'll excuse the slightly rambling structure of this mail.
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Re: [libc++] Running tests from cmake?

C Bergström
  On 09/22/11 04:33 AM, David Chisnall wrote:
> So, we have all of the pieces for a completely open C++ stack and GNU ld is, I think, the last big stumbling block for a GPL-free FreeBSD 10.
PathScale is lining up the pieces to do part of the work for a linker,
but not all of it.  Someone @FBSD contacted me, but hasn't followed-up
to figure out if our work will be beneficial to you guys at all.

I honestly think the best option is grab the OpenSolaris linker.  (I
recently too a quick look at the sources and someone should be able to
easily extract it)

Pros
1) You may be able to find ports of it for ARM/MIPS/PPC/SPARC/x86
2) It works well - (I call bs to anyone that says contrary)
3) Extensively tested

Cons (I could be wrong on some of this)
1) Performance - This would possibly pop up with large C++ codes, but I
have no benchmarks to say how slow/fast it is.
2) Plugin architecture - This would tie into LTO/IPA and other compiler
optimizations
3) You're a license zealot
---------------

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Re: [libc++] Running tests from cmake?

OKUMURA Yuki
In reply to this post by OKUMURA Yuki
Hi list,
I'd tested this myself, but some tests failed with ETXTBSY and
"testit" script is preferred choice for now..
(It seems clang driver problem, but i haven't confirmed it yet.)

To reproduce...:
1) (install https://github.com/okuoku/freebsd-head to get xlocale-ready FBSD)
2) install devel/libunwind
3) install libcxxrt from https://github.com/pathscale/libcxxrt
4) patch libcxx/test/lit.cfg

diff --git a/test/lit.cfg b/test/lit.cfg
index d8023fd..026ea63 100644
--- a/test/lit.cfg
+++ b/test/lit.cfg
@@ -146,6 +146,9 @@ if sys.platform == 'darwin':
 if sys.platform == 'linux2':
   libraries += ['-lgcc_eh', '-lsupc++', '-lc', '-lm', '-lrt', '-lgcc_s']
   libraries += ['-Wl,-R', libcxx_obj_root + '/lib']
+if sys.platform == 'freebsd8':
+  libraries += ['-lpthread', '-lcxxrt', '-lunwind', '-lc', '-lm', '-lgcc_s']
+  libraries += ['-Wl,-R', libcxx_obj_root + '/lib']

 config.test_format = LibcxxTestFormat(cxx_under_test,
                                       cpp_flags = ['-nostdinc++'] +
compile_flags + include_paths,

5) configure libc++ with: cmake
-DLIT_EXECUTABLE=/PATH/TO/llvm/utils/lit/lit.py
-DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ /PATH/TO/libcxx
6) gmake && gmake check

You will get errors like following:

UNRESOLVED: libc++ ::
localization/locale.categories/category.monetary/locale.moneypunct.byname/neg_format.pass.cpp
(1980 of 4324)
******************** TEST 'libc++ ::
localization/locale.categories/category.monetary/locale.moneypunct.byname/neg_format.pass.cpp'
FAILED ********************
Exception during script execution:
Traceback (most recent call last):
  File "/usr/home/oku/repos/llvm/utils/lit/lit/main.py", line 122, in runTest
    self.litConfig)
  File "/home/oku/repos/libcxx/test/lit.cfg", line 86, in execute
    out, err, exitCode = self.execute_command(cmd)
  File "/home/oku/repos/libcxx/test/lit.cfg", line 29, in execute_command
    stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  File "/usr/local/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/usr/local/lib/python2.7/subprocess.py", line 1228, in _execute_child
    raise child_exception
OSError: [Errno 26] Text file busy

-- oku
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Re: [libc++] Running tests from cmake?

David Chisnall
I used testit to run the tests.  The FreeBSD port of libunwind contains a semicolon in unwind.h that breaks inclusion in any C++ programs, so you need to remove that after step 3.

When you build libcxxrt, you'll need to specify -nostdlib when you compile, or it will link against libstdc++ (which causes some interesting test failures later).

You don't want to be linking against both libunwind and libgcc_s - they both contain implementations of the generic unwind code, so you're likely to end up with everything horribly broken.  If you want to replace libgcc_s with libunwind, then you will need to use PathScale's version - the libunwind port is just installed for the header, not for the library.

The unresolved libc++ error sounds like it can't find libc++.  I symlinked libc++.so and libcxxrt.so into /usr/local/lib, used clang from svn (which looks here by default - the system compiler only looks in /usr, the ports version looks in /usr/local).  

With that done, almost all of the tests pass.  Hopefully in a few days Roman will start working on merging this stuff into the base system, so end users won't need to worry about it.

David

On 22 Sep 2011, at 23:51, OKUMURA Yuki wrote:

> Hi list,
> I'd tested this myself, but some tests failed with ETXTBSY and
> "testit" script is preferred choice for now..
> (It seems clang driver problem, but i haven't confirmed it yet.)
>
> To reproduce...:
> 1) (install https://github.com/okuoku/freebsd-head to get xlocale-ready FBSD)
> 2) install devel/libunwind
> 3) install libcxxrt from https://github.com/pathscale/libcxxrt
> 4) patch libcxx/test/lit.cfg
>
> diff --git a/test/lit.cfg b/test/lit.cfg
> index d8023fd..026ea63 100644
> --- a/test/lit.cfg
> +++ b/test/lit.cfg
> @@ -146,6 +146,9 @@ if sys.platform == 'darwin':
> if sys.platform == 'linux2':
>   libraries += ['-lgcc_eh', '-lsupc++', '-lc', '-lm', '-lrt', '-lgcc_s']
>   libraries += ['-Wl,-R', libcxx_obj_root + '/lib']
> +if sys.platform == 'freebsd8':
> +  libraries += ['-lpthread', '-lcxxrt', '-lunwind', '-lc', '-lm', '-lgcc_s']
> +  libraries += ['-Wl,-R', libcxx_obj_root + '/lib']
>
> config.test_format = LibcxxTestFormat(cxx_under_test,
>                                       cpp_flags = ['-nostdinc++'] +
> compile_flags + include_paths,
>
> 5) configure libc++ with: cmake
> -DLIT_EXECUTABLE=/PATH/TO/llvm/utils/lit/lit.py
> -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ /PATH/TO/libcxx
> 6) gmake && gmake check
>
> You will get errors like following:
>
> UNRESOLVED: libc++ ::
> localization/locale.categories/category.monetary/locale.moneypunct.byname/neg_format.pass.cpp
> (1980 of 4324)
> ******************** TEST 'libc++ ::
> localization/locale.categories/category.monetary/locale.moneypunct.byname/neg_format.pass.cpp'
> FAILED ********************
> Exception during script execution:
> Traceback (most recent call last):
>  File "/usr/home/oku/repos/llvm/utils/lit/lit/main.py", line 122, in runTest
>    self.litConfig)
>  File "/home/oku/repos/libcxx/test/lit.cfg", line 86, in execute
>    out, err, exitCode = self.execute_command(cmd)
>  File "/home/oku/repos/libcxx/test/lit.cfg", line 29, in execute_command
>    stdout=subprocess.PIPE, stderr=subprocess.PIPE)
>  File "/usr/local/lib/python2.7/subprocess.py", line 679, in __init__
>    errread, errwrite)
>  File "/usr/local/lib/python2.7/subprocess.py", line 1228, in _execute_child
>    raise child_exception
> OSError: [Errno 26] Text file busy
>
> -- oku


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