Small configuration fix.

4 files changed, 93 insertions, 60 deletions

diff --git a/ChangeLog b/ChangeLog
index 88a96875..a23f0316 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,9 @@
 2015-02-27         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* symbol.c (check_param_names): Fix argument order in memset() call.
+	* configure.ac: Use AC_SEARCH_LIBS instead of AC_CHECK_LIB. This fixes
+	a long-standing problem where `-lm' was used twice in the final
+	compilation line.
 
 2015-02-24         Arnold D. Robbins     <arnold@skeeve.com>
 
diff --git a/configh.in b/configh.in
index 7ef6678d..f7ec5c91 100644
--- a/configh.in
+++ b/configh.in
@@ -96,9 +96,6 @@
 /* Define to 1 if you have the <libintl.h> header file. */
 #undef HAVE_LIBINTL_H
 
-/* Define to 1 if you have the `m' library (-lm). */
-#undef HAVE_LIBM
-
 /* Define to 1 if you have a fully functional readline library. */
 #undef HAVE_LIBREADLINE
 
diff --git a/configure b/configure
index b51250ae..2595fe3b 100755
--- a/configure
+++ b/configure
@@ -9600,13 +9600,12 @@ fi
 fi
 
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for fmod in -lm" >&5
-$as_echo_n "checking for fmod in -lm... " >&6; }
-if ${ac_cv_lib_m_fmod+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing fmod" >&5
+$as_echo_n "checking for library containing fmod... " >&6; }
+if ${ac_cv_search_fmod+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lm  $LIBS"
+  ac_func_search_save_LIBS=$LIBS
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -9625,33 +9624,44 @@ return fmod ();
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_m_fmod=yes
-else
-  ac_cv_lib_m_fmod=no
+for ac_lib in '' m; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_fmod=$ac_res
 fi
 rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
+    conftest$ac_exeext
+  if ${ac_cv_search_fmod+:} false; then :
+  break
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_m_fmod" >&5
-$as_echo "$ac_cv_lib_m_fmod" >&6; }
-if test "x$ac_cv_lib_m_fmod" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBM 1
-_ACEOF
+done
+if ${ac_cv_search_fmod+:} false; then :
 
-  LIBS="-lm $LIBS"
+else
+  ac_cv_search_fmod=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_fmod" >&5
+$as_echo "$ac_cv_search_fmod" >&6; }
+ac_res=$ac_cv_search_fmod
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
 
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for isinf in -lm" >&5
-$as_echo_n "checking for isinf in -lm... " >&6; }
-if ${ac_cv_lib_m_isinf+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing isinf" >&5
+$as_echo_n "checking for library containing isinf... " >&6; }
+if ${ac_cv_search_isinf+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lm  $LIBS"
+  ac_func_search_save_LIBS=$LIBS
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -9670,33 +9680,44 @@ return isinf ();
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_m_isinf=yes
-else
-  ac_cv_lib_m_isinf=no
+for ac_lib in '' m; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_isinf=$ac_res
 fi
 rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
+    conftest$ac_exeext
+  if ${ac_cv_search_isinf+:} false; then :
+  break
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_m_isinf" >&5
-$as_echo "$ac_cv_lib_m_isinf" >&6; }
-if test "x$ac_cv_lib_m_isinf" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBM 1
-_ACEOF
+done
+if ${ac_cv_search_isinf+:} false; then :
 
-  LIBS="-lm $LIBS"
+else
+  ac_cv_search_isinf=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_isinf" >&5
+$as_echo "$ac_cv_search_isinf" >&6; }
+ac_res=$ac_cv_search_isinf
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
 
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ismod in -lm" >&5
-$as_echo_n "checking for ismod in -lm... " >&6; }
-if ${ac_cv_lib_m_ismod+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing ismod" >&5
+$as_echo_n "checking for library containing ismod... " >&6; }
+if ${ac_cv_search_ismod+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lm  $LIBS"
+  ac_func_search_save_LIBS=$LIBS
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -9715,23 +9736,35 @@ return ismod ();
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_m_ismod=yes
-else
-  ac_cv_lib_m_ismod=no
+for ac_lib in '' m; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_ismod=$ac_res
 fi
 rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
+    conftest$ac_exeext
+  if ${ac_cv_search_ismod+:} false; then :
+  break
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_m_ismod" >&5
-$as_echo "$ac_cv_lib_m_ismod" >&6; }
-if test "x$ac_cv_lib_m_ismod" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBM 1
-_ACEOF
+done
+if ${ac_cv_search_ismod+:} false; then :
 
-  LIBS="-lm $LIBS"
+else
+  ac_cv_search_ismod=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_ismod" >&5
+$as_echo "$ac_cv_search_ismod" >&6; }
+ac_res=$ac_cv_search_ismod
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
 
 fi
 
diff --git a/configure.ac b/configure.ac
index 8dd79aae..7633e2e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -261,9 +261,9 @@ AC_CHECK_FUNC(getaddrinfo, [AC_DEFINE(HAVE_GETADDRINFO, 1, [have getaddrinfo])],
 			    [AC_DEFINE(HAVE_GETADDRINFO, 1,
 				       [have getaddrinfo])])])
 
-AC_CHECK_LIB(m, fmod)
-AC_CHECK_LIB(m, isinf)
-AC_CHECK_LIB(m, ismod)
+AC_SEARCH_LIBS(fmod, m)
+AC_SEARCH_LIBS(isinf, m)
+AC_SEARCH_LIBS(ismod, m)
 dnl Don't look for libsigsegv on OSF/1, gives us severe headaches
 case $host_os in
 osf1)	: ;;