Re: Check lib on path

[Andrew W. Nosenko]

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.

-- 
Andrew W. Nosenko <address@hidden>