libiodbc has hard conflict against unixODBC

[spodzone (Tim Haynes)]

sh/scr, psammite  4:20PM libiodbc/ % port info libiodbc|grep -Ei '3.52|conflict'
libiodbc @3.52.12 (devel)
Conflicts with:       unixODBC

This conflict causes a lot of unnecessary pain - I want to install both digiKam (with a load of dependencies through all of KDE to libiodbc) and Saga GIS (wants unixODBC).

There is a simple workaround: invoke ./configure --includedir=DIR --disable-libodbc This will move the conflicting header files and disable the creation of libodbc.so.

[mf2k (Frank Schima)]

In the future, please use WikiFormatting and Cc the port maintainers (port info --maintainers libiodbc), if any.

[ryandesign (Ryan Carsten Schmidt)]

This was partially addressed in [c175b9ba889d42decf33b787906eb70801265031/macports-ports] but see comments at ​https://lists.macports.org/pipermail/macports-dev/2018-May/038837.html about additional changes that are still needed.

[nerdling (Jeremy Lavergne)]

Referring to Ryan's email that had issues with the code:

+variant libodbc description {install extra libodbc.so library} {

+ configure.args-replace --disable-libodbc --enable-libodbc

+}

This variant appears to install the file libodbc.a, not libodbc.so.

libiodbc has these specific configuration flags, whose specific language was used for the variant descriptions:

  --enable-libodbc        install extra libodbc.so library (default)
  --disable-libodbc       do not install extra libodbc.so library

I agree it appears to actually create a .a file as seen below and will swap the extension in our messaging, however I don't doubt that this file still created the reported conflict.

Enable creates these lib/lib* files:

work/destroot/opt/local/lib/libiodbc.2.dylib
work/destroot/opt/local/lib/libiodbc.a
work/destroot/opt/local/lib/libiodbc.dylib
work/destroot/opt/local/lib/libiodbcinst.2.dylib
work/destroot/opt/local/lib/libiodbcinst.a
work/destroot/opt/local/lib/libiodbcinst.dylib

Disable creates these lib/lib* files:

work/destroot/opt/local/lib/libiodbc.2.dylib
work/destroot/opt/local/lib/libiodbc.a
work/destroot/opt/local/lib/libiodbc.dylib
work/destroot/opt/local/lib/libiodbcinst.2.dylib
work/destroot/opt/local/lib/libiodbcinst.a
work/destroot/opt/local/lib/libiodbcinst.dylib
work/destroot/opt/local/lib/libodbc.a

[nerdling (Jeremy Lavergne)]

Unfortunately, the header files still appear to conflict regardless of the variant. So only degree of conflict is conditional, and these ports will always conflict.

% sudo port -Nstu install current -libodbc
--->  Computing dependencies for libiodbc
--->  Fetching distfiles for libiodbc
--->  Attempting to fetch iODBC-3.52.13.tar.gz from https://github.com/openlink/iODBC/tarball/v3.52.13
--->  Verifying checksums for libiodbc
--->  Extracting libiodbc
Warning: The following existing file was hidden from the build system by trace mode:
  /private/var/select/sh
--->  Applying patches to libiodbc
Warning: The following existing file was hidden from the build system by trace mode:
  /private/var/select/sh
--->  Configuring libiodbc
Warning: The following existing files were hidden from the build system by trace mode:
  /opt/local/bin/ggrep
  /opt/local/bin/gmkdir
  /opt/local/bin/gsed
  /opt/local/bin/pkg-config
  /private/var/select/sh
--->  Building libiodbc
Warning: The following existing file was hidden from the build system by trace mode:
  /private/var/select/sh
--->  Staging libiodbc into destroot
Warning: The following existing files were hidden from the build system by trace mode:
  /private/var/select/sh
  /var/root/.CFUserTextEncoding
--->  Installing libiodbc @3.52.13_1+x11
--->  Activating libiodbc @3.52.13_1+x11
Error: Failed to activate libiodbc: Image error: /opt/local/include/odbcinst.h is being used by the active unixODBC port.  Please deactivate this port first, or use 'port -f activate libiodbc' to force the activation.

[nerdling (Jeremy Lavergne)]

Ah, and now I see the --includedir=DIR part now that I'm not focusing on the email that was elsewhere.

Do we have any preference for a replacement includedir just to avoid this conflict?

[nerdling (Jeremy Lavergne)]

Eh, I'll just try using ${prefix}/include/${name}.

[nerdling (Jeremy Lavergne)]

In 2fc686d75679397013381ad49dde2771c14d6297/macports-ports (master):

unixODBC: conditionally conflict with libiodbc (​https://github.com/macports/macports-ports/pull/8282)

libiodbc: avoid default conflicts with unixODBC

• reword variant description from .so to .a
• fix typo in default variants
• change include dir
• conditionally conflict with unixODBC
• bump revision due to changes to installed files
• Fixes #55661