Library path with AC_CHECK_LIB

[Bill Moseley]

I was building our package on a Solaris 2.6 machine and ended up with:

  ld: fatal: library -lz: not found

On this machine libz is in /usr/local/lib.

Running truss shows:

open("/usr/ccs/lib/libz.so", O_RDONLY)          Err#2 ENOENT
open("/usr/ccs/lib/libz.a", O_RDONLY)           Err#2 ENOENT
open("/usr/lib/libz.so", O_RDONLY)              Err#2 ENOENT
open("/usr/lib/libz.a", O_RDONLY)               Err#2 ENOENT
ld: write(2, " l d :  ", 4)                             = 4
fatal: write(2, " f a t a l :  ", 7)                    = 7
library -lwrite(2, " l i b r a r y   - l", 10)          = 10
zwrite(2, " z", 1)                              = 1
: not foundwrite(2, " :   n o t   f o u n d", 11)               = 11

So it's not looking in /usr/local/lib.

So my question is why is configure finding libz?

I looked at our configure.in and we have the following (which now seems 
overly complicated and doesn't need to take an argument).  But I'm 
curious why or how autoconf was able to link without an error.


dnl if withval not no or and not yes
if test "$withval" != "no" -a "$withval" != "yes"; then
    Z_DIR=$withval
    CPPFLAGS="${CPPFLAGS} -I$withval/include"
    LDFLAGS="${LDFLAGS} -L$withval/lib"
fi

dnl if withval is maybe
if test "$withval" = "maybe"; then
    withval="yes"
    Z_DIR=""
    CPPFLAGS="${CPPFLAGS}"
    LDFLAGS="${LDFLAGS}"
fi

dnl if withval not no then try to enable zlib support
if test "$withval" != "no"; then
    AC_CHECK_HEADERS(zlib.h,
        AC_CHECK_LIB(z, gzread,[
        AC_DEFINE(HAVE_ZLIB,[],[Do we have zlib])
            if test "x${Z_DIR}" != "x"; then
                Z_CFLAGS="-I${Z_DIR}/include"
                Z_LIBS="-L${Z_DIR}/lib -lz"
            else
                Z_LIBS="-lz"
            fi]))
    AC_SUBST(Z_CFLAGS)
    AC_SUBST(Z_LIBS)
else
    AC_MSG_RESULT([Not building with zlib for property compression - use 
--with-zlib to enable])
fi






-- 
Bill Moseley
address@hidden