Re: Check lib on path

[Philip Herron]

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Andrew W. Nosenko wrote:
> On Mon, Aug 10, 2009 at 12:07, Philip
> Herron<address@hidden> wrote:
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>> Andrew W. Nosenko wrote:
>>> On Mon, Aug 10, 2009 at 03:44, Philip
>>> Herron<address@hidden> wrote:
>>>> Hey guys
>>>>
>>>> I have a project i am using GNU MP and MPFR for, and i am using:
>>>>
>>>> ACX_PTHREAD(,AC_MSG_ERROR(could not find libpthread))
>>>> LIBS="${PTHREAD_LIBS} ${LIBS}" AM_CFLAGS="${PTHREAD_CFLAGS}
>>>> ${AM_CFLAGS}" CC="$PTHREAD_CC"
>>>>
>>>> AC_CHECK_LIB([gmp], [__gmpz_init], , [AC_MSG_ERROR([GNU MP not
>>>> found, see http://gmplib.org/])]) AC_CHECK_LIB([mpfr],[mpfr_init]
>>>> , [AC_MSG_ERROR([MPFR not found, see http://www.mpfr.org/])])
>>>>
>>>> The pthreads comes from a macro acx_pthreads.m4 i think, but the
>>>> gmp and mpfr are the problem, I have on a mac machine the
>>>> libraries in /usr/local/lib and the headers in
>>>> /usr/local/include, but on my bsd and linux machines its all in
>>>> /usr
>>>>
>>>> The linux and bsd is ok with ac_check_lib, but on mac no, is
>>>> there a way to pass the library path and header path? To give -I
>>>> and -L to gcc or sun compilers ( i have only been using these
>>>> compilers so far ) or whatever compiler.
>>>>
>>>>
>>>> I can't seem to find anything on this.
>>>>
>>> 1. Try to use -pthread compiler option (or analog, depends on
>>> compiler) instead of linking around libpthread directly.  Sometime
>>> the true name of thread library may be different.  Sometime systems
>>> have more than one thread library.
>>>
>>> 2. IIRC, on Mac OS X you don't need any special library or flag at
>>> all.  All pthread functionality is a part of libSystem (mac analog
>>> of libc) and libpthread is just a symlink to it.
>> My question wasn't on pthreads i'm using a macro i found for that:
>> http://ac-archive.sourceforge.net/ac-archive/acx_pthread.html
>>
>> But the mpfr and gmp libs are the problem, as they are in different
>> paths on both systems. But thanks because i don't know mac os that
>> well just have access to it for a while for some dev.
>>
>
> Sorry.  I didn't understand your needs.
>
> Seems like your compiler doesn't search /usr/local/ hierarchy or its
> analog (at least it is common case on FreeBSD).
>
> I workaround it by following code:
>
>     AC_CANONICAL_HOST
>
>     # Workaround OS related problems in the default search path:
>     #   o  FreeBSD bug: GCC on FreeBSD doesn't search
>     #      /usr/local/include and /usr/local/lib directories.
>     #   o  MacOS X/Darwin problem: GCC on Darwin doesn't search
>     #      /opt/local/include and /opt/local/lib directories.
>     #
>     case "$host_os" in
>     freebsd*)
>         CPPFLAGS="$CPPFLAGS -I/usr/local/include"
>         LDFLAGS="$LDFLAGS -L/usr/local/lib"
>         ;;
>     darwin*)
>         CPPFLAGS="$CPPFLAGS -I/opt/local/include"
>         LDFLAGS="$LDFLAGS -L/opt/local/lib"
>         ;;
>     esac
>
>     # ... AC_CHECK_LIB, AC_CHECK_HEADER, AC_CHECK_ waht you want
>
> Hope, it will help.
>

Ah this is nice! Thanks are these flags -I and -L still working on
other compilers other than gcc? like sun etc would be nice. I am
thinking i might keep this snippet for a while, but i might introduce
a cmd line switch like gmp-lib-dir=/opt.... etc :)

Thanks!

- --Phil
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