acinclude/libtool.m4: updates from mainstream git:

- Disables chained fixups for macOS ('-no_fixup_chains' if supported by
  linker), because it is not compatible with '-undefined dynamic_lookup'
- Fixes Wstrict-prototypes warnings
- Regenerate the 'configure' script.

acinclude/libtool.m4

@@ -1023,6 +1023,21 @@ m4_defun_once([_LT_REQUIRED_DARWIN_CHECKS],[
 	rm -f conftest.*
       fi])
 
+    # Feature test to disable chained fixups since it is not
+    # compatible with '-undefined dynamic_lookup'
+    AC_CACHE_CHECK([for -no_fixup_chains linker flag],
+      [lt_cv_support_no_fixup_chains],
+      [ save_LDFLAGS=$LDFLAGS
+        LDFLAGS="$LDFLAGS -Wl,-no_fixup_chains"
+        AC_LINK_IFELSE(
+          [AC_LANG_PROGRAM([],[])],
+          lt_cv_support_no_fixup_chains=yes,
+          lt_cv_support_no_fixup_chains=no
+        )
+        LDFLAGS=$save_LDFLAGS
+      ]
+    )
+
     AC_CACHE_CHECK([for -exported_symbols_list linker flag],
       [lt_cv_ld_exported_symbols_list],
       [lt_cv_ld_exported_symbols_list=no
@@ -1047,7 +1062,7 @@ _LT_EOF
       echo "$RANLIB libconftest.a" >&AS_MESSAGE_LOG_FD
       $RANLIB libconftest.a 2>&AS_MESSAGE_LOG_FD
       cat > conftest.c << _LT_EOF
-int main() { return 0;}
+int main(void) { return 0;}
 _LT_EOF
       echo "$LTCC $LTCFLAGS $LDFLAGS -o conftest conftest.c -Wl,-force_load,./libconftest.a" >&AS_MESSAGE_LOG_FD
       $LTCC $LTCFLAGS $LDFLAGS -o conftest conftest.c -Wl,-force_load,./libconftest.a 2>conftest.err
@@ -1072,7 +1087,11 @@ _LT_EOF
         10.[[012]],*|,*powerpc*-darwin[[5-8]]*)
           _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined ${wl}suppress' ;;
         *)
-          _lt_dar_allow_undefined='$wl-undefined ${wl}dynamic_lookup' ;;
+          _lt_dar_allow_undefined='$wl-undefined ${wl}dynamic_lookup'
+          if test yes = "$lt_cv_support_no_fixup_chains"; then
+            _lt_dar_allow_undefined='$_lt_dar_allow_undefined $wl-no_fixup_chains'
+          fi
+        ;;
       esac
     ;;
   esac
@@ -1862,11 +1881,11 @@ else
 /* When -fvisibility=hidden is used, assume the code has been annotated
    correspondingly for the symbols needed.  */
 #if defined __GNUC__ && (((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 3))
-int fnord () __attribute__((visibility("default")));
+int fnord (void) __attribute__((visibility("default")));
 #endif
 
-int fnord () { return 42; }
-int main ()
+int fnord (void) { return 42; }
+int main (void)
 {
   void *self = dlopen (0, LT_DLGLOBAL|LT_DLLAZY_OR_NOW);
   int status = $lt_dlunknown;
@@ -4052,7 +4071,7 @@ void nm_test_func(void){}
 #ifdef __cplusplus
 }
 #endif
-int main(){nm_test_var='a';nm_test_func();return(0);}
+int main(void){nm_test_var='a';nm_test_func();return(0);}
 _LT_EOF
 
   if AC_TRY_EVAL(ac_compile); then
@@ -6218,7 +6237,7 @@ _LT_TAGVAR(objext, $1)=$objext
 lt_simple_compile_test_code="int some_variable = 0;"
 
 # Code to be used in simple link tests
-lt_simple_link_test_code='int main(){return(0);}'
+lt_simple_link_test_code='int main(void){return(0);}'
 
 _LT_TAG_COMPILER
 # Save the default compiler, since it gets overwritten when the other

configure

@@ -6836,7 +6836,7 @@ void nm_test_func(void){}
 #ifdef __cplusplus
 }
 #endif
-int main(){nm_test_var='a';nm_test_func();return(0);}
+int main(void){nm_test_var='a';nm_test_func();return(0);}
 _LT_EOF
 
   if { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_compile\""; } >&5
@@ -8098,6 +8098,43 @@ fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $lt_cv_apple_cc_single_mod" >&5
 printf "%s\n" "$lt_cv_apple_cc_single_mod" >&6; }
 
+    # Feature test to disable chained fixups since it is not
+    # compatible with '-undefined dynamic_lookup'
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -no_fixup_chains linker flag" >&5
+printf %s "checking for -no_fixup_chains linker flag... " >&6; }
+if test ${lt_cv_support_no_fixup_chains+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+   save_LDFLAGS=$LDFLAGS
+        LDFLAGS="$LDFLAGS -Wl,-no_fixup_chains"
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"
+then :
+  lt_cv_support_no_fixup_chains=yes
+else $as_nop
+  lt_cv_support_no_fixup_chains=no
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam \
+    conftest$ac_exeext conftest.$ac_ext
+        LDFLAGS=$save_LDFLAGS
+
+
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $lt_cv_support_no_fixup_chains" >&5
+printf "%s\n" "$lt_cv_support_no_fixup_chains" >&6; }
+
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -exported_symbols_list linker flag" >&5
 printf %s "checking for -exported_symbols_list linker flag... " >&6; }
 if test ${lt_cv_ld_exported_symbols_list+y}
@@ -8150,7 +8187,7 @@ _LT_EOF
       echo "$RANLIB libconftest.a" >&5
       $RANLIB libconftest.a 2>&5
       cat > conftest.c << _LT_EOF
-int main() { return 0;}
+int main(void) { return 0;}
 _LT_EOF
       echo "$LTCC $LTCFLAGS $LDFLAGS -o conftest conftest.c -Wl,-force_load,./libconftest.a" >&5
       $LTCC $LTCFLAGS $LDFLAGS -o conftest conftest.c -Wl,-force_load,./libconftest.a 2>conftest.err
@@ -8178,7 +8215,11 @@ printf "%s\n" "$lt_cv_ld_force_load" >&6; }
         10.[012],*|,*powerpc*-darwin[5-8]*)
           _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined ${wl}suppress' ;;
         *)
-          _lt_dar_allow_undefined='$wl-undefined ${wl}dynamic_lookup' ;;
+          _lt_dar_allow_undefined='$wl-undefined ${wl}dynamic_lookup'
+          if test yes = "$lt_cv_support_no_fixup_chains"; then
+            _lt_dar_allow_undefined='$_lt_dar_allow_undefined $wl-no_fixup_chains'
+          fi
+        ;;
       esac
     ;;
   esac
@@ -9078,7 +9119,7 @@ objext=$objext
 lt_simple_compile_test_code="int some_variable = 0;"
 
 # Code to be used in simple link tests
-lt_simple_link_test_code='int main(){return(0);}'
+lt_simple_link_test_code='int main(void){return(0);}'
 
 
 
@@ -12629,11 +12670,11 @@ else
 /* When -fvisibility=hidden is used, assume the code has been annotated
    correspondingly for the symbols needed.  */
 #if defined __GNUC__ && (((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 3))
-int fnord () __attribute__((visibility("default")));
+int fnord (void) __attribute__((visibility("default")));
 #endif
 
-int fnord () { return 42; }
-int main ()
+int fnord (void) { return 42; }
+int main (void)
 {
   void *self = dlopen (0, LT_DLGLOBAL|LT_DLLAZY_OR_NOW);
   int status = $lt_dlunknown;
@@ -12736,11 +12777,11 @@ else
 /* When -fvisibility=hidden is used, assume the code has been annotated
    correspondingly for the symbols needed.  */
 #if defined __GNUC__ && (((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 3))
-int fnord () __attribute__((visibility("default")));
+int fnord (void) __attribute__((visibility("default")));
 #endif
 
-int fnord () { return 42; }
-int main ()
+int fnord (void) { return 42; }
+int main (void)
 {
   void *self = dlopen (0, LT_DLGLOBAL|LT_DLLAZY_OR_NOW);
   int status = $lt_dlunknown;
@@ -19218,13 +19259,15 @@ then :
   ac_cv_func_alloca_works=yes
 else $as_nop
   ac_cv_func_alloca_works=no
+
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.beam \
     conftest$ac_exeext conftest.$ac_ext
 fi
+
+fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_alloca_works" >&5
 printf "%s\n" "$ac_cv_func_alloca_works" >&6; }
-fi
 
 if test $ac_cv_func_alloca_works = yes; then
 
@@ -26411,6 +26454,9 @@ else $as_nop
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
                 ;;
+            *-*-solaris*)
+                enable_video_vulkan=no
+                ;;
             *-*-darwin*)
                 save_CFLAGS="$CFLAGS"
                 CFLAGS="$CFLAGS -x objective-c"