[GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

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[GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.2.1
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Currently if you pass a C source file on the GHC command line you can
 control whether the compiler treats it as C or C++ via the it's extension:
 GCC will treat a file ending in `.c` as C, whereas `.cpp` is treated as
 C++.

 However, we currently have no means of controlling what language a stub
 added with in Template Haskell with `addCStub` will be treated as.
 Consequently it is currently impossible to compile a C++ source file with
 `addCStub` without using `-optc`. Moreover, you can't have mixed C/C++
 stubs at all.

 It really seems like this interface should be amended to fix this before
 we release it in 8.2. Perhaps `addCStub` should accept both the source and
 a set of compiler flags which will be added to the usual flags (allowing
 one to pass `-x c++` to the compiler when compiling C++ files)?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by facundo.dominguez):

 In the current implementation all stubs go into the same file as the C
 stubs.

 This means that multiple calls of `addCStub` have visibility of the the
 definitions that have been inserted earlier (actually I'm not sure of the
 order but this could be arranged).

 We could send each stub to a different file certainly. And ask for forward
 declarations.

 > Moreover, you can't have mixed C/C++ stubs at all.

 Not even doing
 {{{
 addCStub "extern \"C\" { ... }"
 }}}
 ?

 BTW, what's wrong with using `-optc`?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:1>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bgamari):

 > Perhaps a dumb question: What's wrong with using -optc?

 It very well may break other stubs, who expect to be compiled with a C
 compiler (and therefore will break with C++ name mangling). These users
 include GHC itself, which uses C stubs for static pointers and profiler
 initialization.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:2>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bitonic
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bitonic):

 * owner:  (none) => bitonic


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:3>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bitonic
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by mboes):

 I'm not convinced there is any bug here. inline-c snippets really are
 stubs, and C ones at that, no different from the ones produced by the
 `capi` calling convention and foreign exports. So it makes sense to treat
 them as such. And even to include the inline-c snippets in the same stubs
 file as the other stubs, since any compiler options should apply equally
 to both.

 Now, should we furthermore support C++? I'm unconvinced that this should
 be done as part of `addCStub`. After all, C++ is an entirely separate
 language. It so happens that a large subset of C is included in C++, but
 that's incidental. In fact C++ is so different that name mangling is
 different, and not understood by GHC at all.

 So I think that if users want not just C stubs but also C++ stubs, that it
 makes sense to have `addCppStubs`, which ideally would take into account
 Cabal's `cpp-options`, just as `addCStubs` takes into account `cc-
 options`. And why not, in the future `addJavaStubs`, `addCsharpStubs` etc.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:4>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bitonic
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by mboes):

 Argh forget what I said about `cpp-options`... That's CPP as in the
 preprocessor obviously.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:5>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bitonic
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bitonic):

 The situation is that right now `addCStubs` streams content to the same
 file that is used for Haskell-from-C exports and `capi` calls, which I
 think is very fragile.

 This file includes imports and CPP macros outside the control of the
 person using `addCStub`, and thus code using `addCStub` might very well
 break if we change how that file is generated of simply if the C code
 conflicts with the content that is already in the stubs file.

 Moreover, if we want to add multi-language support, we needed to generate
 multiple files anyway.

 So me, rwbarton, and bgamari concluded that it would be better to just let
 the user emit an arbitrary number of files that will be compiled and
 linked with the current module. This is well-suited to `inline-c` since we
 can collect all the stubs and emit them at once with `addModFinalizer`.

 Hopefully this makes the motivation for the change clearer.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:6>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bitonic
            Type:  feature request   |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by rwbarton):

 * differential:   => Phab:D3280
 * type:  bug => feature request


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:7>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bitonic
            Type:  feature request   |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by facundo.dominguez):

 Is this addressed after merging Phab:D3280? IIUC, it is ok to use `-optc`
 to affect all stubs in a module as long as `-x lang` is not given.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:8>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bitonic
            Type:  feature request   |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bitonic):

 Yes, this is solved by D3280, since `addForeignFile` gives the user
 specific support for languages other than C.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:9>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bitonic
            Type:  feature request   |               Status:  closed
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bitonic):

 * status:  new => closed
 * resolution:   => fixed


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:10>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  bitonic
            Type:  feature request   |               Status:  closed
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bitonic):

 Actually, I realized now that the scope of the ticket is a bit wider --
 since it's regarding any compilation flag. It would be easy to extend
 `addForeignFile` to accept other flags, but I don't think is as critical
 (at least it isn't for my use cases). I'll leave the decision to bgamari.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:11>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bitonic):

 * owner:  bitonic => (none)
 * status:  closed => new
 * resolution:  fixed =>


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:12>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  feature request   |               Status:  closed
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 I think the currently situation is good enough for now.

 Phab:D3280 was merged in 0fac488cca04a07224926e35be9c45ee2d0e1631.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:13>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  feature request   |               Status:  closed
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by alpmestan):

 The `T13366` test fails on master from yesterday, when executed with the
 `ghci` way:

 {{{
 =====> T13366(ghci) 1 of 1 [0, 0, 0]
 cd "./th/T13366.run" && "/home/alp/ghc/inplace/test   spaces/ghc-stage2"
 T13366.hs -dcore-lint -dcmm-lint -no-user-package-db -rtsopts -fno-warn-
 missed-specialisations -fshow-warning-groups -fdiagnostics-color=never
 -fno-diagnostics-show-caret -dno-debug-output -XTemplateHaskell -package
 template-haskell --interactive -v0 -ignore-dot-ghci -fno-ghci-history +RTS
 -I0.1 -RTS -lstdc++ -v0< T13366.genscript
 Actual stderr output differs from expected:
 diff -uw "/dev/null" "./th/T13366.run/T13366.run.stderr.normalised"
 --- /dev/null   2018-03-07 13:03:27.344000000 +0100
 +++ ./th/T13366.run/T13366.run.stderr.normalised        2018-03-08
 14:49:20.583965000 +0100
 @@ -0,0 +1,13 @@
 +ghc: ^^ Could not load 'fcxx', dependency unresolved. See top entry
 above.
 +
 +
 +ByteCodeLink: can't find label
 +During interactive linking, GHCi couldn't find the following symbol:
 +  fcxx
 +This may be due to you not asking GHCi to load extra object files,
 +archives or DLLs needed by your current session.  Restart GHCi,
 specifying
 +the missing library using the -L/path/to/object/dir and -lmissinglibname
 +flags, or simply by naming the relevant files on the GHCi command line.
 +Alternatively, this link failure might indicate a bug in GHCi.
 +If you suspect the latter, please send a bug report to:
 +  [hidden email]
 *** unexpected failure for T13366(ghci)
 }}}

 where the aforementionned symbol is defined in a snippet of C++ code that
 TH adds to the build through `addForeignFile`:

 {{{#!hs
 foreign import ccall fcxx :: Int -> IO Int

 do addForeignFile LangCxx $ unlines
      [ "#include <iostream>"
      , "extern \"C\" {"
      , "  int fcxx(int x) {"
      , "    std::cout << \"calling fcxx(\" << x << \")\" << std::endl;"
      , "    std::cout.flush();"
      , "    return A_MACRO + x;"
      , "  }"
      , "}"
      ]
    return []
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:14>
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Re: [GHC] #13366: addCStub doesn't allow control over compiler flags or source file file

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#13366: addCStub doesn't allow control over compiler flags or source file file
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  feature request   |               Status:  closed
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3280
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by alpmestan):

 * cc: alpmestan (added)


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13366#comment:15>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler

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