winegcc: Check for linker relocation support before relying on prelink.

Prelink was used to rewrite binares and set their text segment, but
modern linkers support setting the value at link time. Prelink is
being retired by upstream.

Signed-off-by: Michael Cronenworth <mike@cchtml.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

configure

@@ -8678,7 +8678,32 @@ if test "x$ac_cv_cflags__Wl___section_start__interp_0x7bf00400" = xyes; then :
                            esac
 
 fi
-          # Extract the first word of "prelink", so it can be a program name with args.
+          { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -Wl,-Ttext-segment=0x7bc00000" >&5
+$as_echo_n "checking whether the compiler supports -Wl,-Ttext-segment=0x7bc00000... " >&6; }
+if ${ac_cv_cflags__Wl__Ttext_segment_0x7bc00000+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_wine_try_cflags_saved=$CFLAGS
+CFLAGS="$CFLAGS -Wl,-Ttext-segment=0x7bc00000"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int main(int argc, char **argv) { return 0; }
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_cflags__Wl__Ttext_segment_0x7bc00000=yes
+else
+  ac_cv_cflags__Wl__Ttext_segment_0x7bc00000=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+CFLAGS=$ac_wine_try_cflags_saved
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_cflags__Wl__Ttext_segment_0x7bc00000" >&5
+$as_echo "$ac_cv_cflags__Wl__Ttext_segment_0x7bc00000" >&6; }
+if test "x$ac_cv_cflags__Wl__Ttext_segment_0x7bc00000" = xyes; then :
+  :
+else
+  # Extract the first word of "prelink", so it can be a program name with args.
 set dummy prelink; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
@@ -8719,10 +8744,11 @@ $as_echo "no" >&6; }
 fi
 
 
-          if test "x$PRELINK" = xfalse
+                           if test "x$PRELINK" = xfalse
-          then
+                           then
-              as_fn_append wine_warnings "|prelink not found, base address of core dlls won't be set correctly."
+                               as_fn_append wine_warnings "|prelink not found and linker does not support relocation, base address of core dlls won't be set correctly."
-          fi
+                           fi
+fi
           ;;
       esac
 

configure.ac

@@ -988,11 +988,12 @@ wine-installed: main.o
                            *) LDEXECFLAGS="$LDEXECFLAGS -Wl,--section-start,.interp=0x7bf00400" ;;
                            esac
                           ])
-          AC_PATH_PROG(PRELINK, prelink, false, [/sbin /usr/sbin $PATH])
+          WINE_TRY_CFLAGS([-Wl,-Ttext-segment=0x7bc00000],[:],
-          if test "x$PRELINK" = xfalse
+                          [AC_PATH_PROG(PRELINK, prelink, false, [/sbin /usr/sbin $PATH])
-          then
+                           if test "x$PRELINK" = xfalse
-              WINE_WARNING([prelink not found, base address of core dlls won't be set correctly.])
+                           then
-          fi
+                               WINE_WARNING([prelink not found and linker does not support relocation, base address of core dlls won't be set correctly.])
+                           fi])
           ;;
       esac
 

tools/winegcc/winegcc.c

@@ -776,6 +776,7 @@ static void build(struct options* opts)
     char *output_file;
     const char *spec_o_name;
     const char *output_name, *spec_file, *lang;
+    const char *prelink = NULL;
     int generate_app_loader = 1;
     int fake_module = 0;
     unsigned int j;
@@ -1134,6 +1135,13 @@ static void build(struct options* opts)
         }
         break;
     default:
+        if (opts->image_base)
+        {
+            if (!try_link(opts->prefix, link_args, strmake("-Wl,-Ttext-segment=%s", opts->image_base)))
+                strarray_add(link_args, strmake("-Wl,-Ttext-segment=%s", opts->image_base));
+            else
+                prelink = PRELINK;
+        }
         break;
     }
 
@@ -1167,10 +1175,9 @@ static void build(struct options* opts)
     spawn(opts->prefix, link_args, 0);
     strarray_free (link_args);
 
-    /* set the base address */
+    /* set the base address with prelink if linker support is not present */
-    if (opts->image_base && !opts->target)
+    if (prelink && !opts->target)
     {
-        const char *prelink = PRELINK;
         if (prelink[0] && strcmp(prelink,"false"))
         {
             strarray *prelink_args = strarray_alloc();