--enable-auto-image-base linker option for Cygwin

[John W. Eaton]

On  8-Jul-2005, James R. Phillips wrote:

| Cygwin maintainers periodically grouse about needing the rebase utility, and
| recently have proposed use of --enable-auto-image-base as a linker option, in
| the hopes of reducing or eliminating dll address base collisions, thus
| eliminating the need for rebase.
| 
| AFAICT, this would require adding "-wl,--enable-auto-image-base" to the
| SH_LDFLAGS defined for cygwin/mingw in configure.in.
| 
| Is this feasible, and is it worth doing?
| 
| I have not seen the "failing fork()" issue that necessitates use of rebase 
with
| the cygwin build 2.1.71-1.  I have seen it in the past, though, for earlier
| builds that were not official cygwin packages.

I can apply the following change if it solves a real problem.  Is
there any disadvantage to making this change?

jwe


ChangeLog:

2005-07-14  John W. Eaton  <address@hidden>

        * configure.in (SH_LDFLAGS): Add -Wl,--enable-auto-image-base for
        Cygwin and MinGW.


Index: configure.in
===================================================================
RCS file: /cvs/octave/configure.in,v
retrieving revision 1.479
diff -u -r1.479 configure.in
--- configure.in        15 Jun 2005 03:45:47 -0000      1.479
+++ configure.in        14 Jul 2005 17:29:24 -0000
@@ -850,7 +850,7 @@
     SHLEXT=dll
     SHLLIB=dll.a
     SHLBIN=dll
-    SH_LDFLAGS="-shared -Wl,--export-all-symbols -Wl,--enable-auto-import"
+    SH_LDFLAGS="-shared -Wl,--export-all-symbols -Wl,--enable-auto-import 
-Wl,--enable-auto-image-base"
     SHLLINKEXT=.dll
     SONAME_FLAGS='-Wl,address@hidden'
     library_path_var=PATH