sim: support dlopen in -lc

Stop assuming that dlopen is only available via -ldl.  Newer versions
of glibc have merged it into -lc which broke this configure test.

diff --git a/sim/configure b/sim/configure
index a7a914ad2c3b8ee1e9515008b4983bc7b5b06022..79a21e8be642f8d49b62afbf5d6342e0afb6d0d4 100755 (executable)
--- a/sim/configure
+++ b/sim/configure
@@ -12915,7 +12915,7 @@ if test "$ac_res" != no; then :
 
 fi
 
-if test "${ac_cv_lib_dl_dlopen}" = "yes"; then
+if test "${ac_cv_search_dlopen}" = "none required" || test "${ac_cv_lib_dl_dlopen}" = "yes"; then
 
 pkg_failed=no
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sdl2" >&5

diff --git a/sim/m4/sim_ac_platform.m4 b/sim/m4/sim_ac_platform.m4
index 7331ef3a38c5d8cffdf2d9b7e4bec484abe5e1d3..f45321763fa7487f586c4723720d7dbbb1afb3cf 100644 (file)
--- a/sim/m4/sim_ac_platform.m4
+++ b/sim/m4/sim_ac_platform.m4
@@ -151,7 +151,7 @@ AC_SEARCH_LIBS([fabs], [m])
 AC_SEARCH_LIBS([log2], [m])
 
 AC_SEARCH_LIBS([dlopen], [dl])
-if test "${ac_cv_lib_dl_dlopen}" = "yes"; then
+if test "${ac_cv_search_dlopen}" = "none required" || test "${ac_cv_lib_dl_dlopen}" = "yes"; then
   PKG_CHECK_MODULES(SDL, sdl2, [dnl
     SDL_CFLAGS="${SDL_CFLAGS} -DHAVE_SDL=2"
   ], [