build: Prefer AC_CHECK_TYPE() over AC_LINK_IFELSE().

[paraslash.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index c2cb47e6f993c6cbbad343208ce634af8bf80173..b6aac81b98973f384fff3deafb5be36eac05fa88 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -54,10 +54,6 @@ AC_PATH_PROG([M4], [m4])
 test -z "$M4" && AC_MSG_ERROR(
        [The m4 macro processor is required to build this package])
 
-AC_PATH_PROG([lopsubgen], [lopsubgen])
-test -z "$lopsubgen" && AC_MSG_ERROR(
-       [lopsubgen is required to build this package])
-
 AC_PROG_CC
 AC_PROG_CPP
 
@@ -71,9 +67,11 @@ AC_CHECK_LIB([osl], [osl_open_table], [], [HAVE_OSL=no])
 LIB_SUBST_FLAGS(osl)
 UNSTASH_FLAGS
 ######################################################################## lopsub
+HAVE_LOPSUB=yes
+AC_PATH_PROG([LOPSUBGEN], [lopsubgen])
+test -z "$LOPSUBGEN" && HAVE_LOPSUB=no
 STASH_FLAGS
 LIB_ARG_WITH([lopsub], [-llopsub])
-HAVE_LOPSUB=yes
 AC_CHECK_HEADER(lopsub.h, [], [HAVE_LOPSUB=no])
 AC_CHECK_LIB([lopsub], [lls_merge], [], [HAVE_LOPSUB=no])
 if test $HAVE_LOPSUB = no; then AC_MSG_ERROR([
@@ -165,17 +163,12 @@ AC_DEFINE_UNQUOTED(ICONV_CAST, $cast, [cast for second arg to iconv()])
 AC_MSG_RESULT($msg)
 UNSTASH_FLAGS
 ########################################################################### ucred
-AC_MSG_CHECKING(for struct ucred)
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+AC_CHECK_TYPE([struct ucred], [
+       AC_DEFINE(HAVE_UCRED, 1, define to 1 you have struct ucred)
+], [], [
        #include <sys/types.h>
        #include <sys/socket.h>
-]], [[
-       struct ucred sucred; sucred.pid=0;
-]])],[have_ucred=yes],[have_ucred=no])
-AC_MSG_RESULT($have_ucred)
-if test ${have_ucred} = yes; then
-       AC_DEFINE(HAVE_UCRED, 1, define to 1 you have struct ucred)
-fi
+])
 ########################################################################### curses
 STASH_FLAGS
 LIB_ARG_WITH([curses], [])
@@ -186,18 +179,12 @@ curses_ldflags="$curses_ldflags $LIBS"
 LIB_SUBST_FLAGS(curses)
 UNSTASH_FLAGS
 ########################################################################### ip_mreqn
-AC_MSG_CHECKING(for struct ip_mreqn (UDPv4 multicast))
-AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+AC_CHECK_TYPE([struct ip_mreqn], [
+       AC_DEFINE(HAVE_IP_MREQN, 1, define to 1 if you have struct ip_mreqn)
+], [], [
        #include <netdb.h>
        #include <net/if.h>
-]], [[
-       struct ip_mreqn mn;
-       mn.imr_ifindex = 0;
-]])],[have_ip_mreqn=yes],[have_ip_mreqn=no])
-AC_MSG_RESULT($have_ip_mreqn)
-if test ${have_ip_mreqn} = yes; then
-       AC_DEFINE(HAVE_IP_MREQN, 1, define to 1 if you have struct ip_mreqn)
-fi
+])
 ########################################################################### ogg
 STASH_FLAGS
 LIB_ARG_WITH([ogg], [-logg])