[filesystem] path.cpp fails to compile under clang/Cygwin

Peter Dimov

5 Jan 2015 5 Jan '15

4:31 p.m.

Fails like this: clang-linux.compile.c++.without-pth ..\..\..\bin.v2\libs\filesystem\build\clang-linux-3.4.2\release\link-static\path.obj ..\..\..\libs\filesystem\src\path.cpp:36:11: fatal error: 'windows_file_codecvt.hpp' file not found # include "windows_file_codecvt.hpp" ^ 1 error generated. "clang++" -c -x c++ -Wno-variadic-macros -Wno-c99-extensions -O3 -Wno-inline -Wall -DBOOST_ALL_NO_LIB=1 -DBOOST_FILESYSTEM_STATIC_LINK=1 -DBOOST_SYSTEM_STATIC_LINK=1 -DNDEBUG -I"..\..\..\include" -o "..\..\..\bin.v2\libs\filesystem\build\clang-linux-3.4.2\release\link-static\path.obj" "..\..\..\libs\filesystem\src\path.cpp" Looks like a clang bug; the file is certainly there, in the same directory as path.cpp.

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Nelson, Erik - 2

5 Jan 5 Jan

4:51 p.m.

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Beman Dawes

4:59 p.m.

New subject: [filesystem] path.cpp fails to compile under clang/Cygwin

On Mon, Jan 5, 2015 at 11:31 AM, Peter Dimov wrote:

...

Fails like this:

clang-linux.compile.c++.without-pth ..\..\..\bin.v2\libs\ filesystem\build\clang-linux-3.4.2\release\link-static\path.obj ..\..\..\libs\filesystem\src\path.cpp:36:11: fatal error: 'windows_file_codecvt.hpp' file not found # include "windows_file_codecvt.hpp" ^ 1 error generated.

"clang++" -c -x c++ -Wno-variadic-macros -Wno-c99-extensions -O3 -Wno-inline -Wall -DBOOST_ALL_NO_LIB=1 -DBOOST_FILESYSTEM_STATIC_LINK=1 -DBOOST_SYSTEM_STATIC_LINK=1 -DNDEBUG -I"..\..\..\include" -o "..\..\..\bin.v2\libs\filesystem\build\clang-linux- 3.4.2\release\link-static\path.obj" "..\..\..\libs\filesystem\src\ path.cpp"

Looks like a clang bug; the file is certainly there, in the same directory as path.cpp.

Filesystem build and test with clang work for me. clang++ --version reports "Ubuntu clang version 3.5-1ubuntu1 (trunk) (based on LLVM 3.5)" The regression tests for both master and develop also show quite a few linux clang results, and none are reporting any errors. So it looks like something is whacky that is specific to your setup. HTH, --Beman

Peter Dimov

5:07 p.m.

New subject: [filesystem] path.cpp fails to compile under clang/Cygwin

Beman Dawes wrote:

...

Filesystem build and test with clang work for me.

clang++ --version reports "Ubuntu clang version 3.5-1ubuntu1 (trunk) (based on LLVM 3.5)"

My clang is the Cygwin one, running under Windows.

Beman Dawes

16 Jan 16 Jan

12:27 p.m.

New subject: [filesystem] path.cpp fails to compile under clang/Cygwin

On Mon, Jan 5, 2015 at 12:07 PM, Peter Dimov wrote:

...

My clang is the Cygwin one, running under Windows.

I'm having no luck at all with "b2 toolset=clang" on Windows. What does your "using" entry in user-config.jam look like? Thanks, --Beman

Peter Dimov

4:29 p.m.

New subject: [filesystem] path.cpp fails to compile underclang/Cygwin

Beman Dawes wrote:

...

On Mon, Jan 5, 2015 at 12:07 PM, Peter Dimov wrote:

...
My clang is the Cygwin one, running under Windows.

I'm having no luck at all with "b2 toolset=clang" on Windows.

What does your "using" entry in user-config.jam look like?

using clang : : : <cxxflags>-Wno-variadic-macros <cxxflags>-Wno-c99-extensions ; feature.subfeature toolset clang : std : cxx0x cxx11 cxx1y cxx14 : optional composite propagated ; feature.compose toolset-clang:stdcxx0x : <cxxflags>-std=c++0x ; feature.compose toolset-clang:stdcxx11 : <cxxflags>-std=c++11 ; feature.compose toolset-clang:stdcxx1y : <cxxflags>-std=c++1y ; feature.compose toolset-clang:stdcxx14 : <cxxflags>-std=c++14 ; but I doubt that this is the issue. I'm also on the develop branch, if that makes a difference. I had many problems with clang when I tried to make it work on mingw, but the Cygwin version (installed via the Cygwin installer) works out of the box (well, apart from the relative include bug.)

Edward Diener

6:40 p.m.

New subject: [filesystem] path.cpp fails to compile underclang/Cygwin

On 1/16/2015 11:29 AM, Peter Dimov wrote:

...

Beman Dawes wrote:

...
On Mon, Jan 5, 2015 at 12:07 PM, Peter Dimov wrote:

...
My clang is the Cygwin one, running under Windows.

I'm having no luck at all with "b2 toolset=clang" on Windows.

What does your "using" entry in user-config.jam look like?

using clang : : : <cxxflags>-Wno-variadic-macros <cxxflags>-Wno-c99-extensions ;

feature.subfeature toolset clang : std : cxx0x cxx11 cxx1y cxx14 : optional composite propagated ;

feature.compose toolset-clang:stdcxx0x : <cxxflags>-std=c++0x ; feature.compose toolset-clang:stdcxx11 : <cxxflags>-std=c++11 ; feature.compose toolset-clang:stdcxx1y : <cxxflags>-std=c++1y ; feature.compose toolset-clang:stdcxx14 : <cxxflags>-std=c++14 ;

but I doubt that this is the issue. I'm also on the develop branch, if that makes a difference.

I had many problems with clang when I tried to make it work on mingw, but the Cygwin version (installed via the Cygwin installer) works out of the box (well, apart from the relative include bug.)

I have never tried using clang with Cygwin but clang should now be working correctly with mingw, with the last fix I put in Boost Build for clang under Windows, and which has now been put in Boost Build 'master' as well as 'develop'. Of course I am speaking of clang for Windows built using mingw/gcc and not msvc. The msvc compatible implementation is highly problematical due to the clang developers replicating some of the VC++ preprocessor bugs, which breaks Boost PP which expects a standard conforming preprocessor for clang. Also the clang-win.jam which I added to Boost Build for the msvc compatible implementation of clang, and which is frankly based on someone else's implementation kindly available in another post, has never been integrated into Boost Build.

Peter Dimov

9:56 p.m.

New subject: [filesystem] path.cpp fails to compile underclang/Cygwin

Edward Diener wrote:

...

I have never tried using clang with Cygwin...

To clarify, I'm not using clang _with_ Cygwin, that is, I am not using my own compiled clang with an existing Cygwin installation. I am using Cygwin's clang package, as installed by the Cygwin installer. Cygwin's g++ was for a long time stuck at 3.4.6, which made it not particularly viable for Boost testing, but it's on 4.8.3 now and I find it very useful, because it's a POSIX platform, which is good for test coverage. And it has -std=c++11. And clang. What's not to like? Only the fact that gcc.archive fails for some reason, which breaks all tests that want to statically link to Boost.Test. And that Boost.Test fails with -std=c++11 due to absence of mkstemp and putenv. But apart from that, it's perfect. :-)

Edward Diener

11:03 p.m.

New subject: [filesystem] path.cpp fails to compile underclang/Cygwin

On 1/16/2015 4:56 PM, Peter Dimov wrote:

...

Edward Diener wrote:

...
I have never tried using clang with Cygwin...

To clarify, I'm not using clang _with_ Cygwin, that is, I am not using my own compiled clang with an existing Cygwin installation. I am using Cygwin's clang package, as installed by the Cygwin installer.

Cygwin's g++ was for a long time stuck at 3.4.6, which made it not particularly viable for Boost testing, but it's on 4.8.3 now and I find it very useful, because it's a POSIX platform, which is good for test coverage. And it has -std=c++11. And clang. What's not to like? Only the fact that gcc.archive fails for some reason, which breaks all tests that want to statically link to Boost.Test. And that Boost.Test fails with -std=c++11 due to absence of mkstemp and putenv. But apart from that, it's perfect. :-)

I will try running the tests in Boost.Test with both gcc and clang under Windows, to see what the problems with clang are. Maybe I can figure out what is wrong with it.

Beman Dawes

11:27 p.m.

New subject: [filesystem] path.cpp fails to compile underclang/Cygwin

On Fri, Jan 16, 2015 at 4:56 PM, Peter Dimov wrote:

...

Edward Diener wrote:

...
I have never tried using clang with Cygwin...

To clarify, I'm not using clang _with_ Cygwin, that is, I am not using my own compiled clang with an existing Cygwin installation. I am using Cygwin's clang package, as installed by the Cygwin installer.

Cygwin's g++ was for a long time stuck at 3.4.6, which made it not particularly viable for Boost testing, but it's on 4.8.3 now

Better yet, 4.9.2 has been available for a few days now!

...

and I find it very useful, because it's a POSIX platform, which is good for test coverage.

+1. For stuff that I am worried about, I run Linux in a virtual machine, but for every day tests cygwin is great.

...

And it has -std=c++11. And clang. What's not to like? Only the fact that gcc.archive fails for some reason, which breaks all tests that want to statically link to Boost.Test.

I'm having failures for gcc on Windows with the three or four Filesystem test that link statically. It looks to me like Boost.Build is missing dependencies, so compiles aren't run soon enough and then the archive fails. So I'm wondering if the same problem is affecting Boost.Test. Boost.Timer is also failing gcc static links, but I haven't had a chance to look at that in any detail.

...

And that Boost.Test fails with -std=c++11 due to absence of mkstemp and putenv. But apart from that, it's perfect. :-)

I've run into the putenv problem, too. I fixed if for -std=c++11 but now I'm getting a failure for c++ 03 builds, so I've got to reinstate a fix for that case. --Beman

Peter Dimov

11:50 p.m.

New subject: [filesystem] path.cpp fails to compile underclang/Cygwin

Beman Dawes wrote:

...

On Fri, Jan 16, 2015 at 4:56 PM, Peter Dimov wrote:

...
And it has -std=c++11. And clang. What's not to like? Only the fact that gcc.archive fails for some reason, which breaks all tests that want to statically link to Boost.Test.

I'm having failures for gcc on Windows with the three or four Filesystem test that link statically. It looks to me like Boost.Build is missing dependencies, so compiles aren't run soon enough and then the archive fails. So I'm wondering if the same problem is affecting Boost.Test.

Not, it's not that. The problem appears to be that gcc.jam is using g++ -print-prog-name=ar to obtain the path to ar, and this returns /usr/lib/gcc/i686-pc-cygwin/4.8.3/../../../../i686-pc-cygwin/bin/ar.exe which would work in a Cygwin shell, but does not work in a cmd.exe shell, from where I invoke b2. At the moment, I have no idea how this can be fixed.

Peter Dimov

18 Jan 18 Jan

2:24 a.m.

New subject: [filesystem] path.cpp fails to compile underclang/Cygwin

Beman Dawes wrote:

...

Better yet, 4.9.2 has been available for a few days now!

But, as I just discovered, it breaks Clang, because it can no longer find its stdlib headers (looks for 4.8.3). This might be why it doesn't work for you.

Edward Diener

17 Jan 17 Jan

9:25 p.m.

New subject: [filesystem] path.cpp fails to compile underclang/Cygwin

On 1/16/2015 11:29 AM, Peter Dimov wrote:

...

Beman Dawes wrote:

...
On Mon, Jan 5, 2015 at 12:07 PM, Peter Dimov wrote:

...
My clang is the Cygwin one, running under Windows.

I'm having no luck at all with "b2 toolset=clang" on Windows.

What does your "using" entry in user-config.jam look like?

using clang : : : <cxxflags>-Wno-variadic-macros <cxxflags>-Wno-c99-extensions ;

feature.subfeature toolset clang : std : cxx0x cxx11 cxx1y cxx14 : optional composite propagated ;

feature.compose toolset-clang:stdcxx0x : <cxxflags>-std=c++0x ; feature.compose toolset-clang:stdcxx11 : <cxxflags>-std=c++11 ; feature.compose toolset-clang:stdcxx1y : <cxxflags>-std=c++1y ; feature.compose toolset-clang:stdcxx14 : <cxxflags>-std=c++14 ;

but I doubt that this is the issue. I'm also on the develop branch, if that makes a difference.

I had many problems with clang when I tried to make it work on mingw, but the Cygwin version (installed via the Cygwin installer) works out of the box (well, apart from the relative include bug.)

Running Boost.Test using clang targeting mingw/gcc I am running into a problem with "exported" classes, which are '__attribute__((__visibility__("default")))' in clang. Evidently when clang 'exports' a class it attempts to generate a default copy constructor and a default assignment operator when no user-defined functionality is specified, even when no copying or assigning is done for any instance of that class. This causes it to produce errors for a number of Boost.Test classes, execution_monitor in particular, using a member of the non-copyable, non-assignable boost:scoped_ptr type. Has anyone run into this with Boost.Test or any other Boost library compiled with clang ? Is this a known issue with clang ? I reported this on the clang developer's list, although the 'export' reason for the bug was spotted by a clang developer and not me. I am curious that this does not show up for you with cygwin, but maybe this is the cause of some of Beman's problems with clang. This is compiling clang in non-c++11 mode.

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Beman Dawes
Edward Diener
Nelson, Erik - 2
Peter Dimov