- Haskell-Cafe - Haskell.org

Melbourne Haskell Meetup, 2015-10-29 @ 18:30
by Lyndon Maydwell 26 Oct '15

26 Oct '15

Hi All, This week, the monthly Melbourne Haskell Meetup will take place on Thursday, October 29 at the Silverpond offices on Hardware Lane. For details see here: http://www.meetup.com/Melbourne-Haskell-Users-Group/events/225596759/ There will be a talk on Constraint Programming in Haskell by David Overton, as well as the usual free discussion about all things Haskell. Please come along if this interests you :-) - Lyndon ( Thanks to Christian Neukirchen's Munich Haskell announcement for reminding me to tell the Café about our meetup from time to time. )

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Munich Haskell Meeting, 2015-10-29 @ 19:30
by Christian Neukirchen 26 Oct '15

26 Oct '15

Dear all, This week, our monthly Munich Haskell Meeting will take place again on Thursday, October 29 at Cafe Puck at 19h30. For details see here: http://chneukirchen.github.io/haskell-munich.de/dates (http://www.haskell-munich.de/ is currently out of order, but will be restored soon! I hope...) If you plan to join, please add yourself to this dudle so we can reserve enough seats! It is OK to add yourself to the dudle anonymously or pseudonymously. https://dudle.inf.tu-dresden.de/haskell-munich-oct-2015/ Everybody is welcome! cu, -- Christian Neukirchen <chneukirchen(a)gmail.com> http://chneukirchen.org

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Hackage feature request: show types of names listed in index page
by Ömer Sinan Ağacan 26 Oct '15

26 Oct '15

I pretty much said all I wanted to say in the title, but just to rephrase, I think it'd be super helpful if Hackage listed types of names listed in index pages. The reason is because most of the time I'm using index pages for searching things, but if I wanted to list all functions that somehow use a type, for example, index pages don't help. With type information in the index pages I can just search for a type and my browser would highlight all functions that somehow use the type.

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Five more days: Call for Contributions: BOB 2016 - Berlin, Feb 19, 2016
by Matthias Fischmann 26 Oct '15

26 Oct '15

The submission deadline for is five days away. We are happy with the submissions so far, but you can always have more. So if you always wanted to look into some library that everybody is fussing about and then tell people what you learned, or if you have this trick or you wrote that piece of code that you are fond of, please take a minute to check out our submission guidelines this week. http://bobkonf.de/2016/cfp (We have speaker grants for under-represented groups.) cheers, m.

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mashup of Haskell News and hdiff
by Erik Rantapaa 26 Oct '15

26 Oct '15

Hi all, For Haskell News junkies I created a simple mashup of haskellnews.org and Luite Stegeman's hdiff site. It adds a "hdiff" link to all Hackage upload news items so you can conveniently see what changed in the new version. It consists of just an html file and .js file and is available at: https://github.com/erantapaa/haskellnews-hdiff ER

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Glib-0.13.2.1 build failure: multiple definition of `__debugbreak' (ghc-7.11.20151024)
by Burkhard Groh 25 Oct '15

25 Oct '15

In my latest attempt to finally build the gtk3 package with ghc-head 'ghc-master' (7.11.20151024) for a current project under windows x64 using the latest msys2-version and its supplied gtk3 libraries (mingw64/mingw-w64-x86_64-gtk3 3.18.2-1) I encountered this cryptical (linking) error. (See complete log for command './Setup build -v3' attached) I should add that I'm rather a beginner with regards to the Haskell language and its package distribution system cabal. Thus all thoughts, ideas and suggestions how to fix this problem are welcome. Best regards Burkhard complete building response in msys2-shell using the mingw64 script: $ ./Setup build -v3 Component build order: library creating dist\build creating dist\build\autogen Building glib-0.13.2.1... Environment: [("","C:=C:\\Windows\\System32"),("ACLOCAL_PATH","C:\\MSYS2\\mingw64\\share\\aclocal;C:\\MSYS2\\usr\\share\\aclocal"),("ALLUSERSPROFILE","C:\\ProgramData"),("APPDATA","C:\\Users\\PC-08\\AppData\\Roaming"),("CHECKDEF","C:\\Applications\\wingx\\bin"),("COMMONPROGRAMFILES","C:\\Program Files\\Common Files"),("COMMONPROGRAMFILES(X86)","C:\\Program Files (x86)\\Common Files"),("COMMONPROGRAMW6432","C:\\Program Files\\Common Files"),("COMPUTERNAME","PC-08"),("COMSPEC","C:\\Windows\\system32\\cmd.exe"),("FP_NO_HOST_CHECK","NO"),("HOME","C:\\MSYS2\\home\\Ms PC-08"),("HOMEDRIVE","C:"),("HOMEPATH","\\Users\\PC-08"),("HOSTNAME","PC-08"),("INFOPATH","C:\\MSYS2\\usr\\local\\info;C:\\MSYS2\\usr\\share\\info;C:\\MSYS2\\usr\\info;C:\\MSYS2\\share\\info"),("LANG","de_DE.UTF-8"),("LOCALAPPDATA","C:\\Users\\PC-08\\AppData\\Local"),("LOGONSERVER","\\\\PC-08"),("MANPATH","C:\\MSYS2\\mingw64\\share\\man;C:\\MSYS2\\usr\\local\\man;C:\\MSYS2\\usr\\share\\man;C:\\MSYS2\\usr\\man;C:\\MSYS2\\share\\man"),("MSYSCON","mintty.exe"),("MSYSTEM","MINGW64"),("NUMBER_OF_PROCESSORS","4"),("OLDPWD","C:/MSYS2/home/Ms PC-08/cabal"),("ORTEPDIR","C:\\Applications\\ortep3"),("OS","Windows_NT"),("PATH","C:\\Users\\PC-08\\AppData\\Roaming\\cabal\\bin;C:\\Haskell\\ghc-7.11.20151024\\bin;C:\\Haskell\\ghc-7.11.20151024\\mingw\\bin;C:\\MSYS2\\mingw64\\bin;C:\\MSYS2\\usr\\local\\bin;C:\\MSYS2\\usr\\bin;C:\\MSYS2\\usr\\bin;C:\\Program Files (x86)\\CambridgeSoft\\ChemOffice2015\\ChemScript\\Lib;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0;C:\\Program Files (x86)\\ATI Technologies\\ATI.ACE\\Core-Static;C:\\Program Files\\Intel\\WiFi\\bin;C:\\Program Files\\Common Files\\Intel\\WirelessCommon;C:\\Applications\\LinksPortable;C:\\Program Files\\Intel\\WiFi\\bin;C:\\Program Files\\Common Files\\Intel\\WirelessCommon;C:\\Program Files\\Miktex\\miktex\\bin\\x64;C:\\MSYS2\\usr\\bin\\site_perl;C:\\MSYS2\\usr\\bin\\vendor_perl;C:\\MSYS2\\usr\\bin\\core_perl;C:\\Users\\PC-08\\AppData\\Roaming\\cabal\\bin;C:\\Users\\PC-08\\AppData\\Roaming\\cabal\\bin"),("PATHEXT",".COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC"),("PGFONT","C:\\Applications\\wingx\\files\\grfont.dat"),("PKG_CONFIG_PATH","C:\\MSYS2\\mingw64\\lib\\pkgconfig;C:\\MSYS2\\mingw64\\share\\pkgconfig"),("PRINTER","Brother HL-5270DN"),("PROCESSOR_ARCHITECTURE","AMD64"),("PROCESSOR_IDENTIFIER","Intel64 Family 6 Model 69 Stepping 1, GenuineIntel"),("PROCESSOR_LEVEL","6"),("PROCESSOR_REVISION","4501"),("PROGRAMDATA","C:\\ProgramData"),("PROGRAMFILES","C:\\Program Files"),("PROGRAMFILES(X86)","C:\\Program Files (x86)"),("PROGRAMW6432","C:\\Program Files"),("PROMPT","$P$G"),("PS1","\\[\\e]0;\\w\\a\\]\\n\\[\\e[32m\\]\\u@\\h \\[\\e[35m\\]$MSYSTEM\\[\\e[0m\\] \\[\\e[33m\\]\\w\\[\\e[0m\\]\\n\\$ "),("PSMODULEPATH","C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\Modules\\"),("PUBLIC","C:\\Users\\Public"),("PWD","C:/Haskell/gtk2hs-master/glib"),("PYTHONPATH","C:\\Program Files (x86)\\CambridgeSoft\\ChemOffice2015\\ChemScript\\Lib"),("RASMOLPATH","C:\\Program Files (x86)\\RasWin"),("SESSIONNAME","Console"),("SHELL","C:/MSYS2/usr/bin/bash"),("SHLVL","1"),("SYSTEMDRIVE","C:"),("SYSTEMROOT","C:\\Windows"),("TEMP","C:\\Users\\PC-08\\AppData\\Local\\Temp"),("TERM","xterm-256color"),("TMP","C:\\Users\\PC-08\\AppData\\Local\\Temp"),("UOIPME_REG_PATH","C:\\Program Files\\Intel Corporation\\USB over IP"),("USER","Ms PC-08"),("USERDOMAIN","PC-08"),("USERNAME","Ms PC-08"),("USERPROFILE","C:\\Users\\PC-08"),("VS110COMNTOOLS","C:\\Program Files (x86)\\Microsoft Visual Studio 11.0\\Common7\\Tools\\"),("VS120COMNTOOLS","C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\Common7\\Tools\\"),("WD","C:\\MSYS2\\usr\\bin\\"),("WINDIR","C:\\Windows"),("WINGXDIR","C:\\Applications\\wingx"),("XML_CATALOG_FILES","C:/MSYS2/etc/xml/docbook-xml /etc/xml/catalog"),("_","./Setup")] ("C:\\Haskell\\ghc-7.11.20151024\\bin\\ghc-pkg.exe",["init","dist\\package.conf.inplace","-v2"]) writing cache dist\package.conf.inplace\package.cache Preprocessing library glib-0.13.2.1... creating dist\build\System\Glib Environment: [("","C:=C:\\Windows\\System32"),("ACLOCAL_PATH","C:\\MSYS2\\mingw64\\share\\aclocal;C:\\MSYS2\\usr\\share\\aclocal"),("ALLUSERSPROFILE","C:\\ProgramData"),("APPDATA","C:\\Users\\PC-08\\AppData\\Roaming"),("CHECKDEF","C:\\Applications\\wingx\\bin"),("COMMONPROGRAMFILES","C:\\Program Files\\Common Files"),("COMMONPROGRAMFILES(X86)","C:\\Program Files (x86)\\Common Files"),("COMMONPROGRAMW6432","C:\\Program Files\\Common Files"),("COMPUTERNAME","PC-08"),("COMSPEC","C:\\Windows\\system32\\cmd.exe"),("FP_NO_HOST_CHECK","NO"),("HOME","C:\\MSYS2\\home\\Ms PC-08"),("HOMEDRIVE","C:"),("HOMEPATH","\\Users\\PC-08"),("HOSTNAME","PC-08"),("INFOPATH","C:\\MSYS2\\usr\\local\\info;C:\\MSYS2\\usr\\share\\info;C:\\MSYS2\\usr\\info;C:\\MSYS2\\share\\info"),("LANG","de_DE.UTF-8"),("LOCALAPPDATA","C:\\Users\\PC-08\\AppData\\Local"),("LOGONSERVER","\\\\PC-08"),("MANPATH","C:\\MSYS2\\mingw64\\share\\man;C:\\MSYS2\\usr\\local\\man;C:\\MSYS2\\usr\\share\\man;C:\\MSYS2\\usr\\man;C:\\MSYS2\\share\\man"),("MSYSCON","mintty.exe"),("MSYSTEM","MINGW64"),("NUMBER_OF_PROCESSORS","4"),("OLDPWD","C:/MSYS2/home/Ms PC-08/cabal"),("OS","Windows_NT"),("PATH","C:\\Users\\PC-08\\AppData\\Roaming\\cabal\\bin;C:\\Haskell\\ghc-7.11.20151024\\bin;C:\\Haskell\\ghc-7.11.20151024\\mingw\\bin;C:\\MSYS2\\mingw64\\bin;C:\\MSYS2\\usr\\local\\bin;C:\\MSYS2\\usr\\bin;C:\\MSYS2\\usr\\bin;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0;C:\\Program Files (x86)\\ATI Technologies\\ATI.ACE\\Core-Static;C:\\Program Files\\Intel\\WiFi\\bin;C:\\Program Files\\Common Files\\Intel\\WirelessCommon;C:\\Program Files\\Intel\\WiFi\\bin;C:\\Program Files\\Common Files\\Intel\\WirelessCommon;C:\\Program Files\\Miktex\\miktex\\bin\\x64;C:\\MSYS2\\usr\\bin\\site_perl;C:\\MSYS2\\usr\\bin\\vendor_perl;C:\\MSYS2\\usr\\bin\\core_perl;C:\\Users\\PC-08\\AppData\\Roaming\\cabal\\bin;C:\\Users\\PC-08\\AppData\\Roaming\\cabal\\bin"),("PATHEXT",".COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC"),("PGFONT","C:\\Applications\\wingx\\files\\grfont.dat"),("PKG_CONFIG_PATH","C:\\MSYS2\\mingw64\\lib\\pkgconfig;C:\\MSYS2\\mingw64\\share\\pkgconfig"),("PRINTER",""),("PROCESSOR_ARCHITECTURE","AMD64"),("PROCESSOR_IDENTIFIER","Intel64 Family 6 Model 69 Stepping 1, GenuineIntel"),("PROCESSOR_LEVEL","6"),("PROCESSOR_REVISION","4501"),("PROGRAMDATA","C:\\ProgramData"),("PROGRAMFILES","C:\\Program Files"),("PROGRAMFILES(X86)","C:\\Program Files (x86)"),("PROGRAMW6432","C:\\Program Files"),("PROMPT","$P$G"),("PS1","\\[\\e]0;\\w\\a\\]\\n\\[\\e[32m\\]\\u@\\h \\[\\e[35m\\]$MSYSTEM\\[\\e[0m\\] \\[\\e[33m\\]\\w\\[\\e[0m\\]\\n\\$ "),("PSMODULEPATH","C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\Modules\\"),("PUBLIC","C:\\Users\\Public"),("PWD","C:/Haskell/gtk2hs-master/glib"),("PYTHONPATH","C:\\Program Files (x86)\\CambridgeSoft\\ChemOffice2015\\ChemScript\\Lib"),("RASMOLPATH","C:\\Program Files (x86)\\RasWin"),("SESSIONNAME","Console"),("SHELL","C:/MSYS2/usr/bin/bash"),("SHLVL","1"),("SYSTEMDRIVE","C:"),("SYSTEMROOT","C:\\Windows"),("TEMP","C:\\Users\\PC-08\\AppData\\Local\\Temp"),("TERM","xterm-256color"),("TMP","C:\\Users\\PC-08\\AppData\\Local\\Temp"),("UOIPME_REG_PATH","C:\\Program Files\\Intel Corporation\\USB over IP"),("USER","Ms PC-08"),("USERDOMAIN","PC-08"),("USERNAME","Ms PC-08"),("USERPROFILE","C:\\Users\\PC-08"),("VS110COMNTOOLS","C:\\Program Files (x86)\\Microsoft Visual Studio 11.0\\Common7\\Tools\\"),("VS120COMNTOOLS","C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\Common7\\Tools\\"),("WD","C:\\MSYS2\\usr\\bin\\"),("WINDIR","C:\\Windows"),("WINGXDIR","C:\\Applications\\wingx"),("XML_CATALOG_FILES","C:/MSYS2/etc/xml/docbook-xml /etc/xml/catalog"),("_","./Setup")] ("C:\\Haskell\\ghc-7.11.20151024\\bin\\hsc2hs.exe",["--cc=C:\\Haskell\\ghc-7.11.20151024\\mingw\\bin\\gcc.exe","--ld=C:\\Haskell\\ghc-7.11.20151024\\mingw\\bin\\gcc.exe","--cflag=-fno-stack-protector","--lflag=-fno-stack-protector","--cflag=-D__GLASGOW_HASKELL__=711","--cflag=-Dmingw32_BUILD_OS=1","--cflag=-Dx86_64_BUILD_ARCH=1","--cflag=-Dmingw32_HOST_OS=1","--cflag=-Dx86_64_HOST_ARCH=1","--cflag=-Idist\\build\\autogen","--cflag=-Idist\\build","--cflag=-ISystem/Glib","--cflag=-IC:/MSYS2/mingw64/include/glib-2.0","--cflag=-IC:/MSYS2/mingw64/lib/glib-2.0/include","--cflag=-mms-bitfields","--cflag=-U__BLOCKS__","--cflag=-D__attribute__(A)=","--cflag=-DUSE_GCLOSURE_SIGNALS_IMPL","--cflag=-Idist\\build\\autogen","--cflag=-include","--cflag=dist\\build\\autogen\\cabal_macros.h","--lflag=-LC:/MSYS2/mingw64/lib","--lflag=-lgobject-2.0","--lflag=-lglib-2.0","--lflag=-lintl","--cflag=-IC:\\Haskell\\ghc-7.11.20151024\\lib\\bytestring-0.10.6.0\\include","--cflag=-IC:\\Haskell\\ghc-7.11.20151024\\lib\\base-4.8.2.0\\include","--cflag=-IC:\\Haskell\\ghc-7.11.20151024\\lib\\integer-gmp-1.0.0.0\\include","--cflag=-IC:\\Haskell\\ghc-7.11.20151024\\lib/include","--lflag=-LC:\\Users\\PC-08\\AppData\\Roaming\\cabal\\x86_64-windows-ghc-7.11.20151024\\utf8s_LAIfwUZWplI3JK3b6W44Yv","--lflag=-LC:\\Users\\PC-08\\AppData\\Roaming\\cabal\\x86_64-windows-ghc-7.11.20151024\\text_IqwR9CiNGjxJyQdu3bLbNv","--lflag=-LC:\\Haskell\\ghc-7.11.20151024\\lib\\binary-0.7.5.0","--lflag=-LC:\\Haskell\\ghc-7.11.20151024\\lib\\containers-0.5.6.2","--lflag=-LC:\\Haskell\\ghc-7.11.20151024\\lib\\bytestring-0.10.6.0","--lflag=-LC:\\Haskell\\ghc-7.11.20151024\\lib\\deepseq-1.4.1.1","--lflag=-LC:\\Haskell\\ghc-7.11.20151024\\lib\\array-0.5.1.0","--lflag=-LC:\\Haskell\\ghc-7.11.20151024\\lib\\base-4.8.2.0","--lflag=-lwsock32","--lflag=-luser32","--lflag=-lshell32","--lflag=-LC:\\Haskell\\ghc-7.11.20151024\\lib\\integer-gmp-1.0.0.0","--lflag=-LC:\\Haskell\\ghc-7.11.20151024\\lib\\ghc-prim-0.4.0.0","--lflag=-LC:\\Haskell\\ghc-7.11.20151024\\lib/rts","--lflag=-lm","--lflag=-lwsock32","--lflag=-lgdi32","--lflag=-lwinmm","-o","dist\\build\\System\\Glib\\StoreValue.hs","System\\Glib\\StoreValue.hsc"]) dist\build\System\Glib\StoreValue_hsc_utils.o:StoreValue_hsc_utils.c:(.text+0x0): multiple definition of `__debugbreak' dist\build\System\Glib\StoreValue_hsc_make.o:StoreValue_hsc_make.c:(.text+0x0): first defined here collect2.exe: error: ld returned 1 exit status linking dist\build\System\Glib\StoreValue_hsc_make.o failed (exit code 1) command was: C:\Haskell\ghc-7.11.20151024\mingw\bin\gcc.exe dist\build\System\Glib\StoreValue_hsc_make.o dist\build\System\Glib\StoreValue_hsc_utils.o -o dist\build\System\Glib\StoreValue_hsc_make.exe -fno-stack-protector -LC:/MSYS2/mingw64/lib -lgobject-2.0 -lglib-2.0 -lintl -LC:\Users\PC-08\AppData\Roaming\cabal\x86_64-windows-ghc-7.11.20151024\utf8s_LAIfwUZWplI3JK3b6W44Yv -LC:\Users\PC-08\AppData\Roaming\cabal\x86_64-windows-ghc-7.11.20151024\text_IqwR9CiNGjxJyQdu3bLbNv -LC:\Haskell\ghc-7.11.20151024\lib\binary-0.7.5.0 -LC:\Haskell\ghc-7.11.20151024\lib\containers-0.5.6.2 -LC:\Haskell\ghc-7.11.20151024\lib\bytestring-0.10.6.0 -LC:\Haskell\ghc-7.11.20151024\lib\deepseq-1.4.1.1 -LC:\Haskell\ghc-7.11.20151024\lib\array-0.5.1.0 -LC:\Haskell\ghc-7.11.20151024\lib\base-4.8.2.0 -lwsock32 -luser32 -lshell32 -LC:\Haskell\ghc-7.11.20151024\lib\integer-gmp-1.0.0.0 -LC:\Haskell\ghc-7.11.20151024\lib\ghc-prim-0.4.0.0 -LC:\Haskell\ghc-7.11.20151024\lib/rts -lm -lwsock32 -lgdi32 -lwinmm C:\Haskell\ghc-7.11.20151024\bin\hsc2hs.exe returned ExitFailure 1

2 2

Avoiding Dependency loops
by martin 25 Oct '15

25 Oct '15

Hello all, I just split up a program I'm working on into several source files and ran into the following difficulty: module Process implements Process which has a field Runner. Runner is a basically a function which alters a 'System' state. So Process needs Runner, Runner needs System and thus Process needs System. module System implements among others a collection of Processes (because Processes can alter their states). So System needs Process. Eh voila, I have a loop. What I did was to leave the type of the Runner unspecified in Process, i.e. I now have (Process r) where r is the type of the Runner. Thus Process no longer needs to know about System. This does work, but it feels strange and I'm a bit worried that this is an indication for a design flaw, but I cannot see it.

2 4

Projectional editing: Separating a program's AST from its presentation
by Jeffrey Brown 25 Oct '15

25 Oct '15

These ideas were touched on in a previous thread [1]. Our work would be easier if, as data, we separated a program's AST from its layout. If, for instance, the order in which a library's functions are presented on the page were stored as a "projection", separate from the AST that defined those functions, then one could reorder the functions without obscuring the history of changes to anything that was "moved". I assume I am not alone in making a lot of edits aimed solely at allowing me to read or traverse the code faster? Those within-function changes of presentation, like across-function changes of order, obscure the record of functional (as opposed to cosmetic) changes. They don't have to. Moreover, if projections and the AST were separate data, one could use contradictory hierarchiies|projections|layouts for the same data. One projection might group functions by their common purpose (an "is-tree"), while another grouped them by priority to the reader-rewriter (a "do-tree"). Given current technology, text folding does allow us to impose a hierarchy on a text document (even a Haskell document! you just need to indent the code relative to the comments that define the hierarchy). However, if the code is stored as text, then only one hierarchy is possible. In particular one is presently forced to choose between an "is-tree" and a "do-tree". https://groups.google.com/forum/#!msg/haskell-cafe/d8h8J8VxZxo/BNlKUjWeAgAJ -- Jeffrey Benjamin Brown

1 0

Google Cloud API
by Tomas Carnecky 24 Oct '15

24 Oct '15

I recently migrated some infrastructure from AWS to Google Cloud and needed a way to upload a file to a storage bucket. For AWS there's an awesome Haskell library (aws), but I couldn't find anything comparable for interacting with the Google Cloud APIs. While it wouldn't be difficult to write a standalone function for that simple task, I decided to package it up in a library. Currently implemented is uploading a ByteString to a bucket and some metadata server queries. That's all I need currently, but I may add a few more selected APIs in the near future (mostly around managing compute instances). Adding support for new APIs should be relatively easy, even without having to change the library itself. All the internals are exposed to users of the library. There is nothing private or hidden. The library gives you access to convenience functions to send HTTP requests. That, coupled with a bit of JSON/aeson parsing, should cover most use cases. http://hackage.haskell.org/package/google-cloud https://github.com/wereHamster/google-cloud#readme

4 5

wxHaskell on Windows compilation problems
by Michael Jones 24 Oct '15

24 Oct '15

I’m trying to compile an established wxHaskell application (Ubuntu) on Windows 7 and after a day of frustration, I wanted to see if anyone had some clues. The problem is getting wxc to compile against wxWidgets, where wxWidgets was compiled with MinGHC (GHC 7.8.4). Following are my steps up to trouble: - On 64 bit Win 7, install MinGHC, which ends up in the AppData path. - Grab wxWidgets with git and using MSYS shell compile like: mingw32-make -f makefile.gcc SHARED=1 UNICODE=1 BUILD=release clean mingw32-make -f makefile.gcc SHARED=1 UNICODE=1 BUILD=release with the goal of compiler compatibility. - Setup some environment variables like: C_INCLUDE_PATH == C:\PCRE\include CPLUS_INCLUDE_PATH == C:\Libs\wxWidgets\3.0.2\include LIBRARY_PATH == C:\PCRE\lib;C:\Libs\wxHaskell\3.0.2\\lib\gcc_lib MSYSTEM == MINGW64 WXCFG == gcc_dll\mswu WXWIN == C:\Libs\wxWidgets\3.0.2 PATH = C:\Users\michaeljones\AppData\Local\Programs\minghc-7.8.4-x86_64\git-2.4.5.1\cmd;C:\Users\michaeljones\AppData\Local\Programs\minghc-7.8.4-x86_64\git-2.4.5.1\usr\bin;C:\Users\michaeljones\AppData\Local\Programs\minghc-7.8.4-x86_64\ghc-7.8.4\mingw\bin;C:\Users\michaeljones\AppData\Local\Programs\minghc-7.8.4-x86_64\ghc-7.8.4\bin;C:\Users\michaeljones\AppData\Local\Programs\minghc-7.8.4-x86_64\bin;C:\Users\michaeljones\AppData\Roaming\cabal\bin; - Tweak wxUSE_GRAPHICS_CONTEXT - Create sandbox for my project with pointer to a local copy of wxHaskell - Apply a few patches to enable some new table support (stable stuff) - Configure with cabal and compile The first problem is it can’t run wx-config because it looks for a script, so I tweaked the Setup.hs to use the exe and it continues to compile. It gets this error: Building wxc C:\Users\michaeljones\AppData\Local\Programs\minghc-7.8.4-x86_64\ghc-7.8.4\mingw\bin\gcc.exe -Isrc/include -IC:/Users/michaeljones /Documents/linti/libs/wxHaskell/wxc -IC:/Users/michaeljones/Documents/linti/libs/wxHaskell/wxc -DWXUSINGDLL -D_UNICODE -D__WXDEBUG __ -D__WXMSW__ -DHAVE_W32API_H -DwxcREFUSE_MEDIACTRL -DBUILD_DLL -c src\cpp\apppath.cpp -o dist\dist-sandbox-95204306\build\src/cp p/apppath.o In file included from C:\Libs\wxWidgets\3.0.2\include/wx/defs.h:20:0, from C:\Libs\wxWidgets\3.0.2\include/wx/wx.h:14, from src/include/wrapper.h:20, from src\cpp\apppath.cpp:1: C:\Libs\wxWidgets\3.0.2\include/wx/platform.h:136:22: fatal error: wx/setup.h: No such file or directory compilation terminated. So, I copy the wxWidgets setup.h file from include/msvc/wx to include/wx and compile to a new error: Build log ( C:\Users\michaeljones\Documents\linti\linti-beagle\.cabal-sandbox\logs\wxc-0.92.0.0.log ): Building wxc C:\Users\michaeljones\AppData\Local\Programs\minghc-7.8.4-x86_64\ghc-7.8.4\mingw\bin\gcc.exe -Isrc/include -IC:/Users/michaeljones /Documents/linti/libs/wxHaskell/wxc -IC:/Users/michaeljones/Documents/linti/libs/wxHaskell/wxc -DWXUSINGDLL -D_UNICODE -D__WXDEBUG __ -D__WXMSW__ -DHAVE_W32API_H -DwxcREFUSE_MEDIACTRL -DBUILD_DLL -c src\cpp\apppath.cpp -o dist\dist-sandbox-95204306\build\src/cp p/apppath.o In file included from C:\Libs\wxWidgets\3.0.2\include/wx/platform.h:136:0, from C:\Libs\wxWidgets\3.0.2\include/wx/defs.h:20, from C:\Libs\wxWidgets\3.0.2\include/wx/wx.h:14, from src/include/wrapper.h:20, from src\cpp\apppath.cpp:1: C:\Libs\wxWidgets\3.0.2\include/wx/setup.h:12:6: error: #error "This file should only be included when using Microsoft Visual C++" In file included from C:\Libs\wxWidgets\3.0.2\include/wx/platform.h:136:0, from C:\Libs\wxWidgets\3.0.2\include/wx/defs.h:20, from C:\Libs\wxWidgets\3.0.2\include/wx/wx.h:14, from src/include/wrapper.h:20, from src\cpp\apppath.cpp:1: C:\Libs\wxWidgets\3.0.2\include/wx/setup.h:121:1: error: pasting "/" and "vc_x64_dll" does not give a valid preprocessing token C:\Libs\wxWidgets\3.0.2\include/wx/setup.h:121:1: error: pasting "vc_x64_dll" and "/" does not give a valid preprocessing token C:\Libs\wxWidgets\3.0.2\include/wx/setup.h:121:1: error: pasting "/" and "msw" does not give a valid preprocessing token C:\Libs\wxWidgets\3.0.2\include/wx/setup.h:121:1: error: pasting "mswu" and "/" does not give a valid preprocessing token C:\Libs\wxWidgets\3.0.2\include/wx/setup.h:121:27: fatal error: ../../../lib/vc_x64_dll /mswu /wx/setup.h: No such file or directo I assume the problem is that the wxWidget compilation that comes with makefile.gcc is somehow bypassing some linux based compilation method and not leaving the tree in the proper state for wxHaskell. The Wiki page is based on platform, not MinGHC. I used MinGHC because it got me over problems compiling regex-pcre against libpcre where I failed with cygwin. From reading is appeared MinGHC was a good general path. Note, I had the TDM compiler on the machine, but it was taken out, so there is no accidentally use of the wrong compiler or anything going on. Does anyone have any clues how to make wxHaskell and MinGHC work together? Mike

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