This helps:

+++ idlc/source/makefile.mk     25 Jun 2006 02:43:47 -0000
@@ -40,6 +40,8 @@
 TARGETTYPE=CUI
 LIBTARGET=NO
 
+EXTERNAL_WARNINGS_NOT_ERRORS=TRUE
+
 ENABLE_EXCEPTIONS=TRUE
 INCPRE=$(MISC)

Again, different parser create different generated sources, which sometimes are
not warning free. Maybe we should ease the warning=error stance for generated
scripts.

Reassign to sb for further tracking.

The most specific fix would be to add 4273 to idlc/source/parser.y:1.15 line
297.  However, those two warnings about inconsistent dll linkage worry Ause and
me, so it might be interesting to track down the root problem here.  @vq:  Can
you supply the preprocessor output of compiling wrap_parser.cxx?

My UPS failed, so I'm kind of offline ATM. I'll post the file later, but maybe it
helps to know that I use:

$ bison -V
bison (GNU Bison) 2.1

Created attachment 37396 [details]
Preprocessed file

Created attachment 37397 [details]
Compile (preprocess) command

Created attachment 37398 [details]
bison generated file

Created attachment 37399 [details]
bison generated file (hxx)

sb->hjs: do you have time to look at those files?

Ause had a look, and says there is an #ifdef jungle in the bison-geneated .cxx
leading to suspicious declarations of malloc/free, and the .cxx generated with
the Sun Hamburg build environment looks rather different and does not have this
problem.  This could be due to bison 2.1 or due to a cygwin-related bison which
possibly emits code targeted at GCC.  Whatever the root cause, I will just
silence the warning by adding 4273 to idlc/source/parser.y:1.15 line 297.

@vq:  Please verify that idlc/source/parser.y:1.15.2.1 (CWS warningfixes02)
indeed solves your problem.

Re-did previous fix:  Instead of disabling C4273, removed the suspicious #ifdef
WNT block from idlc/source/parser.y that defined std::fprintf, std::malloc,
std::free (which might have been needed long ago, but appears to not be needed
today; the block was in there right from rev 1.1).

The same for rsc/source/parser/rscyacc.y (issue 66879).

@vq:  Please verify that idlc/source/parser.y:1.15.2.2 and
rsc/source/parser/rscyacc.y:1.8.6.2 (CWS warningfixes02) indeed solve your problems.

*** Issue 66879 has been marked as a duplicate of this issue. ***

Sorry, but the patch didn't help.

For rsc:
guw.pl /cygdrive/c/MSVS2003/Vc7/bin/cl.exe @/tmp/mk9dJ7nn
rscyacc.cxx
../../wntmsci10.pro\inc\yyrscyacc.cxx(262) : error C2220: warning treated as
error - no object file generated
../../wntmsci10.pro\inc\yyrscyacc.cxx(262) : warning C4273: 'malloc' :
inconsistent dll linkage
../../wntmsci10.pro\inc\yyrscyacc.cxx(269) : warning C4273: 'free' :
inconsistent dll linkage
dmake:  Error code 2, while making '../../wntmsci10.pro/obj/rscyacc.obj'
---* tg_merge.mk *---

ERROR: Error 65280 occurred while making /cygdrive/d/w1/tin_ws/rsc/source/parser

with a warningfixes02 checkout of rsc.

$ oocvs status source/parser/rscyacc.y
===================================================================
File: rscyacc.y         Status: Up-to-date

   Working revision:    1.8.6.2
   Repository revision: 1.8.6.2 /cvs/gsl/rsc/source/parser/rscyacc.y,v
   Sticky Tag:          cws_src680_warningfixes02 (branch: 1.8.6)


And for idlc:

guw.pl /cygdrive/c/MSVS2003/Vc7/bin/cl.exe @/tmp/mkwMYIc7
wrap_parser.cxx
..\wntmsci10.pro\misc\parser.cxx(548) : error C2220: warning treated as error -
no object file generated
..\wntmsci10.pro\misc\parser.cxx(548) : warning C4273: 'malloc' : inconsistent
dll linkage
..\wntmsci10.pro\misc\parser.cxx(555) : warning C4273: 'free' : inconsistent dll
linkage
dmake:  Error code 2, while making '../wntmsci10.pro/obj/wrap_parser.obj'
---* tg_merge.mk *---

ERROR: Error 65280 occurred while making /cygdrive/d/w1/tin_ws/idlc/source

with a warningfixes02 checkout of idlc.

$ oocvs status source/parser.y 
===================================================================
File: parser.y          Status: Up-to-date

   Working revision:    1.15.2.2
   Repository revision: 1.15.2.2        /cvs/udk/idlc/source/parser.y,v
   Sticky Tag:          cws_src680_warningfixes02 (branch: 1.15.2)

I searched the web a little and it seems this warning is quite common. It looks
like a bison bug, but I wouldn't recommend downgrading just because of a warning.

There is already bison 2.2 and bison 2.3 released, maybe it is already fixed in
this versions. But I wouldn't force an update either ;)

Ok, so I will put back in the disabling of C4273.  (I had guessed the warning
was related to the suspicious #ifdef block, but was not able to verify that myself.)

idlc/source/parser.y:1.15.2.3
rsc/source/parser/rscyacc.cxx:1.7.8.1
rsc/source/parser/rscyacc.y:1.8.6.2

@vq:  Please verify.

I verified that idlc, rsc from warningfixes02 build fine with W32-tcsh.

Reassigning for final closing

Works!

.