Re: issue with AC_CHECK_LIB...

[Bob Friesenhahn <bfriesen@xxxxxxxxxxxxxxxxxxx>]

Sorry, you can not test for the function "main" in a library using 
AC_CHECK_LIB.  That is probably the only function you can not test 
for.  The reason is that AC_CHECK_LIB writes a test program which 
provides its own main.

You could write your own test program which is missing a main() 
function and try compiling/linking it instead.

Bob

On Wed, 30 Jun 2004, Chris Bowlby wrote:

> Hi All,
>
> I've been pegging away with a configure script for the last month or so and 
> feel that I'm getting a good understanding of how things are working, however 
> I've got one issue that I've been trying to figure out for the last few hours 
> and I've tried every suggestion I could find on the net. My issue is that I'm 
> trying to use:
>
> AC_CHECK_LIB([stlport_gcc], [main])
> AC_CHECK_LIB([pqxx], [main])
>
> within the configure script, defining:
>
> SRCH_INC="/usr/local/include /usr/include"
> SRCH_LIB="/usr/local/lib /usr/lib"
>
> #
> # Include directories
> #
> ac_save_IFS=$IFS
> IFS="${IFS}:"
> # SRCH_INC comes from the template file
> for dir in $with_includes $SRCH_INC; do
>  if test -d "$dir"; then
>    INCLUDES="$INCLUDES -I$dir"
>  else
>    AC_MSG_WARN([*** Include directory $dir does not exist.])
>  fi
> done
> IFS=$ac_save_IFS
> AC_SUBST(INCLUDES)
>
>
> #
> # Library directories
> #
> ac_save_IFS=$IFS
> IFS="${IFS}:"
> # LIBRARY_DIRS comes from command line, SRCH_LIB from template file.
> for dir in $LIBRARY_DIRS $SRCH_LIB; do
>  if test -d "$dir"; then
>    LIBDIRS="$LIBDIRS -L$dir"
>  else
>    AC_MSG_WARN([*** Library directory $dir does not exist.])
>  fi
> done
> IFS=$ac_save_IFS
>
> CPPFLAGS="$CPPFLAGS $INCLUDES"
> LDFLAGS="$LDFLAGS $LIBDIRS"
>
> AC_MSG_NOTICE([using CPPFLAGS=$CPPFLAGS])
> AC_MSG_NOTICE([using LDFLAGS=$LDFLAGS])
>
> before I even process the check lib macro's. No matter what I do I always 
> get:
>
> checking for main in -lstlport_gcc... no
> checking for main in -lpqxx... no
>
> And I know the files are located within the path stucture defined by the 
> library search path before I call AC_CHECK_LIB.
>
> > ls -al /usr/local/lib/libpqxx*
> -rwxr-xr-x  1 root  wheel   7265864 Jun 30 11:36 
> /usr/local/lib/libpqxx-2.2.3.so
> -rw-r--r--  1 root  wheel  15174818 Jun 30 11:36 /usr/local/lib/libpqxx.a
> -rwxr-xr-x  1 root  wheel       865 Jun 30 11:36 /usr/local/lib/libpqxx.la
> lrwxr-xr-x  1 root  wheel        16 Jun 30 11:36 /usr/local/lib/libpqxx.so -> 
> libpqxx-2.2.3.so
>
>
> > ls -al /usr/local/lib/libstlport*
> -rwxr-xr-x  1 root  wheel   1586106 Jun 30 11:02 
> /usr/local/lib/libstlport_gcc.a
> lrwxr-xr-x  1 root  wheel        21 Jun 30 11:02 
> /usr/local/lib/libstlport_gcc.so -> libstlport_gcc.so_4_5
> -rwxr-xr-x  1 root  wheel    684045 Jun 30 11:02 
> /usr/local/lib/libstlport_gcc.so_4_5
> -rwxr-xr-x  1 root  wheel  15271126 Jun 30 11:02 
> /usr/local/lib/libstlport_gcc_stldebug.a
> lrwxr-xr-x  1 root  wheel        30 Jun 30 11:02 
> /usr/local/lib/libstlport_gcc_stldebug.so -> libstlport_gcc_stldebug.so_4_5
> -rwxr-xr-x  1 root  wheel   7392400 Jun 30 11:02 
> /usr/local/lib/libstlport_gcc_stldebug.so_4_5
>
> I am royally stuck as I can not compile my app due to missing references, 
> this worked a few days ago, but today it does not.... Does anyone have any 
> suggestions?
>
>
>
>
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======================================
Bob Friesenhahn
bfriesen@xxxxxxxxxxxxxxxxxxx
http://www.simplesystems.org/users/bfriesen


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