configure.ac: Hack around Termux syslog weirdness.

[catacomb] / configure.ac

diff --git a/configure.ac b/configure.ac
index 40353da..b41687a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -245,6 +245,29 @@ AC_SEARCH_LIBS([sqrt], [m])
 AC_SUBST([MATHLIBS], [$LIBS])
 LIBS=$mdw_ORIG_LIBS
 
+dnl Logging is weird under Termux.  Unfortunately, it involves macros, so we
+dnl have to do this the hard way.
+AC_CACHE_CHECK(
+  [library needed for syslog], [mdw_cv_syslog_lib],
+  [mdw_ORIG_LIBS=$LIBS LIBS=
+   for i in 0 1; do
+     AC_TRY_LINK([#include <syslog.h>],
+                [openlog("test", LOG_PID, LOG_DAEMON);
+                 syslog(LOG_ERR, "this is a test");],
+                [ok=t], [ok=nil])
+     case $i,$ok in
+       *,t) mdw_cv_syslog_lib=${LIBS:-none}; break ;;
+       0,nil) LIBS="-llog" ;;
+       1,nil) AC_MSG_ERROR("failed to link test program") ;;
+     esac
+   done
+   LIBS=$mdw_ORIG_LIBS])
+case $mdw_cv_syslog_lib in
+  none) LOGLIBS= ;;
+  *) LOGLIBS=$mdw_cv_syslog_lib ;;
+esac
+AC_SUBST([LOGLIBS])
+
 dnl Find out whether very long integer types are available.
 AC_CHECK_HEADERS([stdint.h])
 AC_SUBST([have_stdint_h])