[MacPorts] #57673: claws-mail: configure: error: libetpan 0.57 not found

[MacPorts]

#57673: claws-mail: configure: error: libetpan 0.57 not found
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  pmetzger
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  claws-mail  |
-------------------------+----------------------

Old description:

> [https://build.macports.org/builders/ports-10.6_i386_legacy-
> builder/builds/56474/steps/install-port/logs/stdio claws-mail fails to
> configure with gcc-4.2]:
>
> {{{
> checking whether to use libetpan... yes
> checking for libetpan-config... /opt/local/bin/libetpan-config
> checking libetpan/libetpan.h usability... yes
> checking libetpan/libetpan.h presence... yes
> checking for libetpan/libetpan.h... yes
> checking whether libetpan-config hints compiles and links fine... no
> *** Claws Mail requires libetpan 0.57 or newer. See http://www.etpan.org/
> *** You can use --disable-libetpan if you don't need IMAP4 and/or NNTP
> support.
> configure: error: libetpan 0.57 not found
> }}}
>
> libetpan is of course installed; config.log shows the reason why it
> wasn't detected:
>
> {{{
> configure:20395: checking whether libetpan-config hints compiles and
> links fine
> configure:20409: /usr/bin/gcc-4.2 -o conftest -pipe -Os -arch x86_64
> -Wno-unused-function -Wno-pointer-sign -Wall -no-cpp-precomp -fno-common
> -I/opt/local/include -I/opt/local/include -L/opt/local/lib
> -Wl,-headerpad_max_install_names -arch x86_64 -Wl,-export_dynamic
> conftest.c  -lm -lresolv -L/opt/local/lib -letpan -L/opt/local/lib
> -Wl,-headerpad_max_install_names -L/opt/local/lib -L/opt/local/lib
> -L/opt/local/lib -lcurl -lidn2 -lpsl -lssl -lcrypto -lssl -lcrypto -lz
> -lexpat -lz -lssl -lcrypto -liconv -lsasl2 -lssl -lcrypto >&5
> ld: unknown option: -export_dynamic
> collect2: ld returned 1 exit status
> }}}

New description:

 [https://build.macports.org/builders/ports-10.6_i386_legacy-
 builder/builds/56474/steps/install-port/logs/stdio claws-mail fails to
 configure on Snow Leopard]:

 {{{
 checking whether to use libetpan... yes
 checking for libetpan-config... /opt/local/bin/libetpan-config
 checking libetpan/libetpan.h usability... yes
 checking libetpan/libetpan.h presence... yes
 checking for libetpan/libetpan.h... yes
 checking whether libetpan-config hints compiles and links fine... no
 *** Claws Mail requires libetpan 0.57 or newer. See http://www.etpan.org/
 *** You can use --disable-libetpan if you don't need IMAP4 and/or NNTP
 support.
 configure: error: libetpan 0.57 not found
 }}}

 libetpan is of course installed; config.log shows the reason why it wasn't
 detected:

 {{{
 configure:20395: checking whether libetpan-config hints compiles and links
 fine
 configure:20409: /usr/bin/gcc-4.2 -o conftest -pipe -Os -arch x86_64 -Wno-
 unused-function -Wno-pointer-sign -Wall -no-cpp-precomp -fno-common
 -I/opt/local/include -I/opt/local/include -L/opt/local/lib
 -Wl,-headerpad_max_install_names -arch x86_64 -Wl,-export_dynamic
 conftest.c  -lm -lresolv -L/opt/local/lib -letpan -L/opt/local/lib
 -Wl,-headerpad_max_install_names -L/opt/local/lib -L/opt/local/lib
 -L/opt/local/lib -lcurl -lidn2 -lpsl -lssl -lcrypto -lssl -lcrypto -lz
 -lexpat -lz -lssl -lcrypto -liconv -lsasl2 -lssl -lcrypto >&5
 ld: unknown option: -export_dynamic
 collect2: ld returned 1 exit status
 }}}

--

Comment (by ryandesign):

 Replying to [comment:1 pmetzger]:
 > This works under current Xcode.

 No doubt! But apparently the version of `ld` on Snow Leopard is too old to
 know about `-export_dynamic`. (I was mistaken earlier when I thought it
 was due to the old compiler because I saw `/usr/bin/gcc-4.2` on the line,
 but `-Wl,-export_dynamic` means "pass `-export_dynamic` to the linker", so
 it's actually the old linker that's causing the problem.)

 Ideally, the configure script should first check whether the linker
 understands a flag before trying to use it. That's the purpose of
 configure scripts: to determine the capabilities of the system and not
 make assumptions. Looking at configure.ac, it's unconditionally using
 `-Wl,-export_dynamic` on macOS.

-- 
Ticket URL: <https://trac.macports.org/ticket/57673#comment:2>
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