sim: build: change AC_CHECK_LIB to AC_SEARCH_LIBS

With more C libraries moving functions entirely into the main -lc,
change the AC_CHECK_LIB calls to AC_SEARCH_LIBS so we look in there
first and avoid extra linkage when possible.

3 files changed, 150 insertions, 107 deletions

diff --git a/sim/config.h.in b/sim/config.h.in
index ba167b36a7c..7c0087fcd0b 100644
--- a/sim/config.h.in
+++ b/sim/config.h.in
@@ -120,18 +120,6 @@
 /* Define to 1 if you have the `kill' function. */
 #undef HAVE_KILL
 
-/* Define to 1 if you have the `dl' library (-ldl). */
-#undef HAVE_LIBDL
-
-/* Define to 1 if you have the `m' library (-lm). */
-#undef HAVE_LIBM
-
-/* Define to 1 if you have the `nsl' library (-lnsl). */
-#undef HAVE_LIBNSL
-
-/* Define to 1 if you have the `socket' library (-lsocket). */
-#undef HAVE_LIBSOCKET
-
 /* Define to 1 if you have the `link' function. */
 #undef HAVE_LINK
 
diff --git a/sim/configure b/sim/configure
index c91cad2e25e..fdb72656466 100755
--- a/sim/configure
+++ b/sim/configure
@@ -12770,13 +12770,12 @@ CC="$lt_save_CC"
 
 
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for bind in -lsocket" >&5
-$as_echo_n "checking for bind in -lsocket... " >&6; }
-if ${ac_cv_lib_socket_bind+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing bind" >&5
+$as_echo_n "checking for library containing bind... " >&6; }
+if ${ac_cv_search_bind+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lsocket  $LIBS"
+  ac_func_search_save_LIBS=$LIBS
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -12795,33 +12794,44 @@ return bind ();
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_socket_bind=yes
-else
-  ac_cv_lib_socket_bind=no
+for ac_lib in '' socket; do
+  if test -z "$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_bind=$ac_res
 fi
 rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
+    conftest$ac_exeext
+  if ${ac_cv_search_bind+:} false; then :
+  break
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_socket_bind" >&5
-$as_echo "$ac_cv_lib_socket_bind" >&6; }
-if test "x$ac_cv_lib_socket_bind" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBSOCKET 1
-_ACEOF
+done
+if ${ac_cv_search_bind+:} false; then :
 
-  LIBS="-lsocket $LIBS"
+else
+  ac_cv_search_bind=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_bind" >&5
+$as_echo "$ac_cv_search_bind" >&6; }
+ac_res=$ac_cv_search_bind
+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 gethostbyname in -lnsl" >&5
-$as_echo_n "checking for gethostbyname in -lnsl... " >&6; }
-if ${ac_cv_lib_nsl_gethostbyname+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing gethostbyname" >&5
+$as_echo_n "checking for library containing gethostbyname... " >&6; }
+if ${ac_cv_search_gethostbyname+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lnsl  $LIBS"
+  ac_func_search_save_LIBS=$LIBS
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -12840,33 +12850,44 @@ return gethostbyname ();
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_nsl_gethostbyname=yes
-else
-  ac_cv_lib_nsl_gethostbyname=no
+for ac_lib in '' nsl; do
+  if test -z "$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_gethostbyname=$ac_res
 fi
 rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
+    conftest$ac_exeext
+  if ${ac_cv_search_gethostbyname+:} false; then :
+  break
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nsl_gethostbyname" >&5
-$as_echo "$ac_cv_lib_nsl_gethostbyname" >&6; }
-if test "x$ac_cv_lib_nsl_gethostbyname" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBNSL 1
-_ACEOF
+done
+if ${ac_cv_search_gethostbyname+:} false; then :
 
-  LIBS="-lnsl $LIBS"
+else
+  ac_cv_search_gethostbyname=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_gethostbyname" >&5
+$as_echo "$ac_cv_search_gethostbyname" >&6; }
+ac_res=$ac_cv_search_gethostbyname
+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 fabs in -lm" >&5
-$as_echo_n "checking for fabs in -lm... " >&6; }
-if ${ac_cv_lib_m_fabs+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing fabs" >&5
+$as_echo_n "checking for library containing fabs... " >&6; }
+if ${ac_cv_search_fabs+:} 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.  */
 
@@ -12885,33 +12906,44 @@ return fabs ();
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_m_fabs=yes
-else
-  ac_cv_lib_m_fabs=no
+for ac_lib in '' m; do
+  if test -z "$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_fabs=$ac_res
 fi
 rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
+    conftest$ac_exeext
+  if ${ac_cv_search_fabs+:} false; then :
+  break
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_m_fabs" >&5
-$as_echo "$ac_cv_lib_m_fabs" >&6; }
-if test "x$ac_cv_lib_m_fabs" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBM 1
-_ACEOF
+done
+if ${ac_cv_search_fabs+:} false; then :
 
-  LIBS="-lm $LIBS"
+else
+  ac_cv_search_fabs=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_fabs" >&5
+$as_echo "$ac_cv_search_fabs" >&6; }
+ac_res=$ac_cv_search_fabs
+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 log2 in -lm" >&5
-$as_echo_n "checking for log2 in -lm... " >&6; }
-if ${ac_cv_lib_m_log2+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing log2" >&5
+$as_echo_n "checking for library containing log2... " >&6; }
+if ${ac_cv_search_log2+:} 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.  */
 
@@ -12930,34 +12962,45 @@ return log2 ();
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_m_log2=yes
-else
-  ac_cv_lib_m_log2=no
+for ac_lib in '' m; do
+  if test -z "$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_log2=$ac_res
 fi
 rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
+    conftest$ac_exeext
+  if ${ac_cv_search_log2+:} false; then :
+  break
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_m_log2" >&5
-$as_echo "$ac_cv_lib_m_log2" >&6; }
-if test "x$ac_cv_lib_m_log2" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBM 1
-_ACEOF
+done
+if ${ac_cv_search_log2+:} false; then :
 
-  LIBS="-lm $LIBS"
+else
+  ac_cv_search_log2=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_log2" >&5
+$as_echo "$ac_cv_search_log2" >&6; }
+ac_res=$ac_cv_search_log2
+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 dlopen in -ldl" >&5
-$as_echo_n "checking for dlopen in -ldl... " >&6; }
-if ${ac_cv_lib_dl_dlopen+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing dlopen" >&5
+$as_echo_n "checking for library containing dlopen... " >&6; }
+if ${ac_cv_search_dlopen+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-ldl  $LIBS"
+  ac_func_search_save_LIBS=$LIBS
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -12976,23 +13019,35 @@ return dlopen ();
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_dl_dlopen=yes
-else
-  ac_cv_lib_dl_dlopen=no
+for ac_lib in '' dl; do
+  if test -z "$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_dlopen=$ac_res
 fi
 rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
+    conftest$ac_exeext
+  if ${ac_cv_search_dlopen+:} false; then :
+  break
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlopen" >&5
-$as_echo "$ac_cv_lib_dl_dlopen" >&6; }
-if test "x$ac_cv_lib_dl_dlopen" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBDL 1
-_ACEOF
+done
+if ${ac_cv_search_dlopen+:} false; then :
 
-  LIBS="-ldl $LIBS"
+else
+  ac_cv_search_dlopen=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_dlopen" >&5
+$as_echo "$ac_cv_search_dlopen" >&6; }
+ac_res=$ac_cv_search_dlopen
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
 
 fi
 
diff --git a/sim/m4/sim_ac_platform.m4 b/sim/m4/sim_ac_platform.m4
index 92fb00a3d79..74ac7fe14d4 100644
--- a/sim/m4/sim_ac_platform.m4
+++ b/sim/m4/sim_ac_platform.m4
@@ -145,12 +145,12 @@ AC_TYPE_UID_T
 LT_INIT
 
 dnl Libraries.
-AC_CHECK_LIB(socket, bind)
-AC_CHECK_LIB(nsl, gethostbyname)
-AC_CHECK_LIB(m, fabs)
-AC_CHECK_LIB(m, log2)
+AC_SEARCH_LIBS([bind], [socket])
+AC_SEARCH_LIBS([gethostbyname], [nsl])
+AC_SEARCH_LIBS([fabs], [m])
+AC_SEARCH_LIBS([log2], [m])
 
-AC_CHECK_LIB(dl, dlopen)
+AC_SEARCH_LIBS([dlopen], [dl])
 if test "${ac_cv_lib_dl_dlopen}" = "yes"; then
   PKG_CHECK_MODULES(SDL, sdl2, [dnl
     SDL_CFLAGS="${SDL_CFLAGS} -DHAVE_SDL=2"