#775: xapian-omega can't find non-system iconv installations
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Reporter: ryandesign | Owner: olly
Type: defect | Status: new
Priority: normal | Milestone:
Component: Omega | Version: 1.4.9
Severity: normal | Keywords:
Blocked By: | Blocking:
Operating System: All |
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Hello, I'm investigating the possibility of
[https://trac.macports.org/ticket/29654 adding xapian-omega to MacPorts].
I used the `--with-iconv` configure flag, which resulted in the error
message:
{{{
checking for library containing iconv... no
configure: error: iconv not found, but --with-iconv specified
}}}
The config.log says:
{{{
configure:17416: checking for library containing iconv
configure:17447: ccache /usr/bin/clang++ -o conftest -pipe -Os
-stdlib=libc++ -arch x86_64 -arch i386 -std=gnu++11 -I/opt/local/include
-I/opt/local/include -L/opt/local/lib -Wl,-headerpad_max_install_names
-arch x86_64 -arch i386 conftest.cpp >&5
Undefined symbols for architecture x86_64:
"_iconv", referenced from:
_main in conftest-5ad1ad.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
}}}
and then:
{{{
configure:17447: ccache /usr/bin/clang++ -o conftest -pipe -Os
-stdlib=libc++ -arch x86_64 -arch i386 -std=gnu++11 -I/opt/local/include
-I/opt/local/include -L/opt/local/lib -Wl,-headerpad_max_install_names
-arch x86_64 -arch i386 conftest.cpp -liconv >&5
Undefined symbols for architecture x86_64:
"_iconv", referenced from:
_main in conftest-519ed3.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
}}}
So it tried to find iconv both with and without `-liconv` and failed both
times. libiconv is installed with !MacPorts so it should have succeeded
when using `-liconv`.
The reason it failed is that it is searching only for a symbol called
`iconv`. Only a primary libiconv installation, such as that provided by an
operating system vendor (and configured with `LIBICONV_PLUG` set), will
have the symbol `iconv`. But in any secondary copies of libiconv, such as
the one provided by !MacPorts, Fink, Homebrew, or manually compiled by the
user, the symbol will instead be called `libiconv`. Other symbols in
secondary libiconv installations are similarly mangled. This symbol
mangling is intentional, so that a user-supplied copy of libiconv does not
interfere with a system-provided possibly older version of libiconv or
even a non-libiconv iconv implementation.
As long as you `#include <iconv.h>` this symbol renaming is transparent to
you. So you probably only need to modify the configure script to include
that header in that test. I'm not an autotools expert and don't know the
best way to accomplish that. There is an iconv.m4 file provided by gettext
which you might be able to look at for ideas.
--
Ticket URL: <https://trac.xapian.org/ticket/775>
Xapian <https://xapian.org/>
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