Rémi Bernon : configure: Build x86_64 PE code with mcmodel=small.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 81859c9af70aa5ed6da3060488d1815a3607c291
URL:    https://gitlab.winehq.org/wine/wine/-/commit/81859c9af70aa5ed6da3060488d1815...

Author: Rémi Bernon <rbernon(a)codeweavers.com>
Date:   Wed Jun 21 07:11:09 2023 +0200

configure: Build x86_64 PE code with mcmodel=small.

Saving a huge number of .refptr indirections for all extern symbols.

---

 configure    | 33 +++++++++++++++++++++++++++++++++
 configure.ac |  3 ++-
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index f41b9cd687f..f73bc827150 100755
--- a/configure
+++ b/configure
@@ -11527,6 +11527,39 @@ printf "%s\n" "$ac_res" >&6; }
 if eval test \"x\$"$as_ac_var"\" = x"yes"
 then :
   as_fn_append ${wine_arch}_EXTRACFLAGS " -mcx16"
+fi }
+              { as_ac_var=`printf "%s\n" "ac_cv_${wine_arch}_cflags_-mcmodel=small" | $as_tr_sh`
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -mcmodel=small" >&5
+printf %s "checking whether $CC supports -mcmodel=small... " >&6; }
+if eval test \${$as_ac_var+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+  ac_wine_try_cflags_saved=$CFLAGS
+ac_wine_try_cflags_saved_exeext=$ac_exeext
+CFLAGS="$CFLAGS -nostdlib -nodefaultlibs -mcmodel=small"
+ac_exeext=".exe"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int __cdecl mainCRTStartup(void) { return 0; }
+_ACEOF
+if ac_fn_c_try_link "$LINENO"
+then :
+  eval "$as_ac_var=yes"
+else $as_nop
+  eval "$as_ac_var=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam \
+    conftest$ac_exeext conftest.$ac_ext
+CFLAGS=$ac_wine_try_cflags_saved
+ac_exeext=$ac_wine_try_cflags_saved_exeext
+fi
+eval ac_res=\$$as_ac_var
+	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+printf "%s\n" "$ac_res" >&6; }
+if eval test \"x\$"$as_ac_var"\" = x"yes"
+then :
+  as_fn_append ${wine_arch}_EXTRACFLAGS " -mcmodel=small"
 fi } ;;
     esac
 
diff --git a/configure.ac b/configure.ac
index bed7b2dec28..606be62632e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -960,7 +960,8 @@ do
                                [AS_VAR_APPEND([${wine_arch}_LDFLAGS],[" -Wl,--disable-stdcall-fixup"])]) ;;
       x86_64) WINE_TRY_PE_CFLAGS([-Wformat-overflow])
               WINE_TRY_PE_CFLAGS([-Wnonnull])
-              WINE_TRY_PE_CFLAGS([-mcx16]) ;;
+              WINE_TRY_PE_CFLAGS([-mcx16])
+              WINE_TRY_PE_CFLAGS([-mcmodel=small]) ;;
     esac
 
     dnl Determine debug info format