[binutils-gdb] sim: support dlopen in -lc

[Michael Frysinger <vapier@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=708aee5ec64bea2c84449f63f3cdaa6d2b0b5892

commit 708aee5ec64bea2c84449f63f3cdaa6d2b0b5892
Author: Mike Frysinger <vapier@gentoo.org>
Date:   Wed Dec 6 20:28:40 2023 -0700

    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:
---
 sim/configure             | 2 +-
 sim/m4/sim_ac_platform.m4 | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/sim/configure b/sim/configure
index a7a914ad2c3..79a21e8be64 100755
--- 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 7331ef3a38c..f45321763fa 100644
--- 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"
   ], [