GNU logs - #35427, boring messages

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Subject: bug#35427: Conflicting declarations of GC_is_heap_ptr
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From: =?UTF-8?Q?S=C3=B6ren?= Jonsson <sorjon02@HIDDEN>
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Date: Thu, 25 Apr 2019 08:20:31 +0200
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Hello,

I'm working on building guile 2.2.4 for Cygwin/Windows. I have now 
resolved a couple of library issues, and have run into a problem with 
conflicting declarations.

Environment:

    Cygwin

    $ gcc --version
    gcc (GCC) 7.4.0
    Copyright � 2017 Free Software Foundation, Inc.

    guile-2.2.4

    gc-8.0.4

Error message:

    make� all-am
    make[3]: Entering directory '/tmp/guile-2.2.4/libguile'
     � CC������ guile-guile.o
    In file included from ../libguile.h:81:0,
     ���������������� from guile.c:34:
    ../libguile/pairs.h:182:1: error: conflicting types for 'GC_is_heap_ptr'
     �GC_is_heap_ptr (void *ptr)
     �^~~~~~~~~~~~~~
    In file included from ../libguile/bdw-gc.h:47:0,
     ���������������� from ../libguile/gc.h:156,
     ���������������� from ../libguile/atomic.h:25,
     ���������������� from ../libguile.h:37,
     ���������������� from guile.c:34:
    /usr/local/include/gc/gc.h:551:20: note: previous declaration of
    'GC_is_heap_ptr' was here
     �GC_API int GC_CALL GC_is_heap_ptr(const void *);
     ������������������� ^~~~~~~~~~~~~~
    make[3]: *** [Makefile:3575: guile-guile.o] Error 1
    make[3]: Leaving directory '/tmp/guile-2.2.4/libguile'

Analysis:

    This appears to be a simple problem with the the function
    GC_is_heap_ptr declared in two different ways in two different
    files: /usr/local/include/gc/gc.h.156 and
    /tmp/guile/2.2.4/libguile/pairs.h. The first file declares it as
    "GC_API int GC_CALL GC_is_heap_ptr(const void *);", and the second
    as "static int
    GC_is_heap_ptr (void *ptr)
    {
     � return GC_base (ptr) != NULL;
    }
    ".

Proposed solution:

    The obvious solution would be to surround the definition in
    libguile/pairs.h with a conditional #ifndef HAVE_GC_IS_HEAP_PTR, but
    i get the impression that libguile/pairs.h is auto-generated, so I
    might brake your code.� What would be your preferred solution?

With my best regards,

-- 
S�ren Jonsson
K�rnv�gen 237
906 27 UME�
SWEDEN
Tel: 090-180 339, 070-603 3896


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<html>
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    <p><br>
    </p>
    <p>Hello,</p>
    <p>I'm working on building guile 2.2.4 for Cygwin/Windows. I have
      now resolved a couple of library issues, and have run into a
      problem with conflicting declarations.</p>
    <p>Environment: <br>
    </p>
    <blockquote>
      <p>Cygwin</p>
      <p>$ gcc --version<br>
        gcc (GCC) 7.4.0<br>
        Copyright � 2017 Free Software Foundation, Inc.</p>
      <p>guile-2.2.4</p>
      <p>gc-8.0.4<br>
      </p>
    </blockquote>
    <p>Error message:</p>
    <blockquote>
      <p>make� all-am<br>
        make[3]: Entering directory '/tmp/guile-2.2.4/libguile'<br>
        � CC������ guile-guile.o<br>
        In file included from ../libguile.h:81:0,<br>
        ���������������� from guile.c:34:<br>
        ../libguile/pairs.h:182:1: error: conflicting types for
        'GC_is_heap_ptr'<br>
        �GC_is_heap_ptr (void *ptr)<br>
        �^~~~~~~~~~~~~~<br>
        In file included from ../libguile/bdw-gc.h:47:0,<br>
        ���������������� from ../libguile/gc.h:156,<br>
        ���������������� from ../libguile/atomic.h:25,<br>
        ���������������� from ../libguile.h:37,<br>
        ���������������� from guile.c:34:<br>
        /usr/local/include/gc/gc.h:551:20: note: previous declaration of
        'GC_is_heap_ptr' was here<br>
        �GC_API int GC_CALL GC_is_heap_ptr(const void *);<br>
        ������������������� ^~~~~~~~~~~~~~<br>
        make[3]: *** [Makefile:3575: guile-guile.o] Error 1<br>
        make[3]: Leaving directory '/tmp/guile-2.2.4/libguile'<br>
      </p>
    </blockquote>
    <p>Analysis:</p>
    <blockquote>
      <p>This appears to be a simple problem with the the function
        GC_is_heap_ptr declared in two different ways in two different
        files: /usr/local/include/gc/gc.h.156 and
        /tmp/guile/2.2.4/libguile/pairs.h. The first file declares it as
        "GC_API int GC_CALL GC_is_heap_ptr(const void *);", and the
        second as "static int<br>
        GC_is_heap_ptr (void *ptr)<br>
        {<br>
        � return GC_base (ptr) != NULL;<br>
        }<br>
        ". <br>
      </p>
    </blockquote>
    <p>Proposed solution:</p>
    <blockquote>
      <p>The obvious solution would be to surround the definition in
        libguile/pairs.h with a conditional #ifndef HAVE_GC_IS_HEAP_PTR,
        but i get the impression that libguile/pairs.h is
        auto-generated, so I might brake your code.� What would be your
        preferred solution?<br>
      </p>
    </blockquote>
    <p>With my best regards,<br>
    </p>
    <pre class="moz-signature" cols="72">-- 
S�ren Jonsson
K�rnv�gen 237
906 27 UME�
SWEDEN
Tel: 090-180 339, 070-603 3896</pre>
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To: =?UTF-8?Q?S=C3=B6ren?= Jonsson <sorjon02@HIDDEN>
Subject: bug#35427: Acknowledgement (Conflicting declarations of
 GC_is_heap_ptr)
Message-ID: <handler.35427.B.155620225017968.ack <at> debbugs.gnu.org>
References: <e184bf44-2c7a-2bd8-e640-a980a40e1c64@HIDDEN>
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Date: Thu, 25 Apr 2019 14:25:02 +0000

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Message sent to bug-guile@HIDDEN:

Subject: bug#35427: Problem solved
References: <e184bf44-2c7a-2bd8-e640-a980a40e1c64@HIDDEN>
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Hello,

By examining the code in both /usr/local/include/gc.h and 
libguile/pairs.h I managed to resolve the problems.

I did this by adding two lines to gc.h, at the top of the file.

    #define HAVE_GC_IS_HEAP_PTR������������� // OSJ
    #define HAVE_GC_MOVE_DISAPPEARING_LINK�� // OSJ

This is maybe not your preffered solution, but I managed to compile and 
link the libraries and programs. Hopefully this helps you.

Best regards,

-- 
S�ren Jonsson
K�rnv�gen 237
906 27 UME�
SWEDEN
Tel: 090-180 339, 070-603 3896


--------------E5A49E9E1F8AD6622815A742
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<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=windows-1252">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <p><br>
    </p>
    <p>Hello,</p>
    <p>By examining the code in both /usr/local/include/gc.h and
      libguile/pairs.h I managed to resolve the problems.</p>
    <p>I did this by adding two lines to gc.h, at the top of the file.<br>
    </p>
    <blockquote>
      <p>#define HAVE_GC_IS_HEAP_PTR������������� // OSJ<br>
        #define HAVE_GC_MOVE_DISAPPEARING_LINK�� // OSJ</p>
    </blockquote>
    <p>This is maybe not your preffered solution, but I managed to
      compile and link the libraries and programs. Hopefully this helps
      you.</p>
    <p>Best regards,<br>
    </p>
    <pre class="moz-signature" cols="72">-- 
S�ren Jonsson
K�rnv�gen 237
906 27 UME�
SWEDEN
Tel: 090-180 339, 070-603 3896</pre>
  </body>
</html>

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Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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