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dnl |
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dnl Improved version of AC_CHECK_LIB |
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dnl |
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dnl Thanks to John Hawkinson (jhawk@mit.edu) |
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dnl |
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dnl usage: |
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dnl |
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dnl AC_LBL_CHECK_LIB(LIBRARY, FUNCTION [, ACTION-IF-FOUND [, |
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dnl ACTION-IF-NOT-FOUND [, OTHER-LIBRARIES]]]) |
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dnl |
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dnl results: |
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dnl |
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dnl LIBS |
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dnl |
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|
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define(AC_LBL_CHECK_LIB, |
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[AC_MSG_CHECKING([for $2 in -l$1]) |
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dnl Use a cache variable name containing both the library and function name, |
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dnl because the test really is for library $1 defining function $2, not |
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dnl just for library $1. Separate tests with the same $1 and different $2's |
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dnl may have different results. |
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ac_lib_var=`echo $1['_']$2['_']$5 | sed 'y%./+- %__p__%'` |
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AC_CACHE_VAL(ac_cv_lbl_lib_$ac_lib_var, |
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[ac_save_LIBS="$LIBS" |
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LIBS="-l$1 $5 $LIBS" |
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AC_TRY_LINK(dnl |
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ifelse([$2], [main], , dnl Avoid conflicting decl of main. |
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[/* Override any gcc2 internal prototype to avoid an error. */ |
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]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus |
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extern "C" |
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#endif |
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])dnl |
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[/* We use char because int might match the return type of a gcc2 |
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builtin and then its argument prototype would still apply. */ |
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char $2(); |
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]), |
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[$2()], |
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eval "ac_cv_lbl_lib_$ac_lib_var=yes", |
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eval "ac_cv_lbl_lib_$ac_lib_var=no") |
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LIBS="$ac_save_LIBS" |
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])dnl |
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if eval "test \"`echo '$ac_cv_lbl_lib_'$ac_lib_var`\" = yes"; then |
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AC_MSG_RESULT(yes) |
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ifelse([$3], , |
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[changequote(, )dnl |
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ac_tr_lib=HAVE_LIB`echo $1 | sed -e 's/[^a-zA-Z0-9_]/_/g' \ |
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-e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'` |
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changequote([, ])dnl |
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AC_DEFINE_UNQUOTED($ac_tr_lib) |
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LIBS="-l$1 $LIBS" |
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], [$3]) |
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else |
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AC_MSG_RESULT(no) |
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ifelse([$4], , , [$4 |
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])dnl |
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fi |
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]) |
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|
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dnl |
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dnl AC_LBL_LIBRARY_NET |
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dnl |
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dnl This test is for network applications that need socket() and |
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dnl gethostbyname() -ish functions. Under Solaris, those applications |
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dnl need to link with "-lsocket -lnsl". Under IRIX, they need to link |
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dnl with "-lnsl" but should *not* link with "-lsocket" because |
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dnl libsocket.a breaks a number of things (for instance: |
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dnl gethostbyname() under IRIX 5.2, and snoop sockets under most |
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dnl versions of IRIX). |
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dnl |
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dnl Unfortunately, many application developers are not aware of this, |
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dnl and mistakenly write tests that cause -lsocket to be used under |
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dnl IRIX. It is also easy to write tests that cause -lnsl to be used |
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dnl under operating systems where neither are necessary (or useful), |
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dnl such as SunOS 4.1.4, which uses -lnsl for TLI. |
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dnl |
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dnl This test exists so that every application developer does not test |
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dnl this in a different, and subtly broken fashion. |
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|
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dnl It has been argued that this test should be broken up into two |
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dnl seperate tests, one for the resolver libraries, and one for the |
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dnl libraries necessary for using Sockets API. Unfortunately, the two |
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dnl are carefully intertwined and allowing the autoconf user to use |
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dnl them independantly potentially results in unfortunate ordering |
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dnl dependancies -- as such, such component macros would have to |
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dnl carefully use indirection and be aware if the other components were |
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dnl executed. Since other autoconf macros do not go to this trouble, |
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dnl and almost no applications use sockets without the resolver, this |
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dnl complexity has not been implemented. |
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dnl |
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dnl The check for libresolv is in case you are attempting to link |
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dnl statically and happen to have a libresolv.a lying around (and no |
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dnl libnsl.a). |
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dnl |
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AC_DEFUN(AC_LBL_LIBRARY_NET, [ |
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# Most operating systems have gethostbyname() in the default searched |
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# libraries (i.e. libc): |
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AC_CHECK_FUNC(gethostbyname, , |
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# Some OSes (eg. Solaris) place it in libnsl: |
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AC_LBL_CHECK_LIB(nsl, gethostbyname, , |
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# Some strange OSes (SINIX) have it in libsocket: |
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AC_LBL_CHECK_LIB(socket, gethostbyname, , |
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# Unfortunately libsocket sometimes depends on libnsl. |
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# AC_CHECK_LIB's API is essentially broken so the |
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# following ugliness is necessary: |
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AC_LBL_CHECK_LIB(socket, gethostbyname, |
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LIBS="-lsocket -lnsl $LIBS", |
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AC_CHECK_LIB(resolv, gethostbyname), |
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-lnsl)))) |
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AC_CHECK_FUNC(socket, , AC_CHECK_LIB(socket, socket, , |
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AC_LBL_CHECK_LIB(socket, socket, LIBS="-lsocket -lnsl $LIBS", , |
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-lnsl))) |
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# DLPI needs putmsg under HPUX so test for -lstr while we're at it |
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AC_CHECK_LIB(str, putmsg) |
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]) |
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|
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dnl |
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dnl Checks to see if struct tm has the BSD tm_gmtoff member |
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dnl |
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dnl usage: |
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dnl |
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dnl AC_ACME_TM_GMTOFF |
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dnl |
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dnl results: |
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dnl |
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dnl HAVE_TM_GMTOFF (defined) |
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dnl |
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AC_DEFUN(AC_ACME_TM_GMTOFF, |
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[AC_MSG_CHECKING(if struct tm has tm_gmtoff member) |
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AC_CACHE_VAL(ac_cv_acme_tm_has_tm_gmtoff, |
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AC_TRY_COMPILE([ |
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# include <sys/types.h> |
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# include <time.h>], |
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[u_int i = sizeof(((struct tm *)0)->tm_gmtoff)], |
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ac_cv_acme_tm_has_tm_gmtoff=yes, |
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ac_cv_acme_tm_has_tm_gmtoff=no)) |
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AC_MSG_RESULT($ac_cv_acme_tm_has_tm_gmtoff) |
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if test $ac_cv_acme_tm_has_tm_gmtoff = yes ; then |
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AC_DEFINE(HAVE_TM_GMTOFF) |
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fi]) |
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|
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dnl |
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dnl Checks to see if struct sockaddr_storage exists |
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dnl |
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dnl usage: |
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dnl |
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dnl AC_ACME_SOCKADDR_STORAGE |
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dnl |
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dnl results: |
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dnl |
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dnl HAVE_SOCKADDR_STORAGE (defined) |
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dnl |
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AC_DEFUN(AC_ACME_SOCKADDR_STORAGE, |
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[AC_MSG_CHECKING(if struct sockaddr_storage exists) |
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AC_CACHE_VAL(ac_cv_acme_sockaddr_storage, |
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AC_TRY_COMPILE([ |
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# include <sys/types.h> |
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# include <sys/socket.h>], |
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[struct sockaddr_storage sas], |
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ac_cv_acme_sockaddr_storage=yes, |
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ac_cv_acme_sockaddr_storage=no)) |
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AC_MSG_RESULT($ac_cv_acme_sockaddr_storage) |
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if test $ac_cv_acme_sockaddr_storage = yes ; then |
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AC_DEFINE(HAVE_SOCKADDR_STORAGE) |
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fi]) |
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|
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dnl |
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dnl Checks to see if struct sockaddr_in6 exists |
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dnl |
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dnl usage: |
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dnl |
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dnl AC_ACME_SOCKADDR_IN6 |
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dnl |
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dnl results: |
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dnl |
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dnl HAVE_SOCKADDR_IN6 (defined) |
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dnl |
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AC_DEFUN(AC_ACME_SOCKADDR_IN6, |
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[AC_MSG_CHECKING(if struct sockaddr_in6 exists) |
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AC_CACHE_VAL(ac_cv_acme_sockaddr_in6, |
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AC_TRY_COMPILE([ |
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# include <sys/types.h> |
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# include <sys/socket.h> |
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# include <netinet/in.h>], |
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[struct sockaddr_in6 sa6], |
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ac_cv_acme_sockaddr_in6=yes, |
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ac_cv_acme_sockaddr_in6=no)) |
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AC_MSG_RESULT($ac_cv_acme_sockaddr_in6) |
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if test $ac_cv_acme_sockaddr_in6 = yes ; then |
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AC_DEFINE(HAVE_SOCKADDR_IN6) |
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fi]) |
