TEST RELEASE: Cygwin 2.1.0-0.4

Ken Brown kbrown@cornell.edu
Wed Jul 15 02:08:00 GMT 2015

On 7/14/2015 6:03 PM, Eric Blake wrote:
> On 07/08/2015 01:39 PM, Warren Young wrote:
>>> - New API sigaltstack, plus definitions for SA_ONSTACK, SS_ONSTACK, SS_DISABLE,
>> Since these were entirely missing before, this can’t be tested without rebuilding software, right?  When rebuilt, existing Cygwin packages may discover the new APIs via autoconf or similar.
>> A search for "sigaltstack” on code.openhub.net found only 95 projects with this string in their source code, almost entirely consisting of *receivers* of that call, such as NetBSD, glibc, and a bunch of Linux forks.
> libsigsegv is a cygwin package (currently 32-bit only) that has
> configure checks to use sigaltstack if present; I have not yet tested if
> it can be configured to work with the new API, but hope to do so in the
> near future.  In fact, if sigaltstack works, it may finally be possible
> to port libsigsegv to 64-bit cygwin (the reason the current package is
> not ported to 64-bit is that libsigsegv is relying on raw assembly and
> Windows native calls to emulate the lack of sigaltstack; but if
> sigaltstack works, then we don't need to port the 64-bit counterpart for
> the 32-bit specific hacks).

I just did a quick test, and it looks promising.  I removed all Cygwin-specific 
code from configure.ac and Makefile.am (see attached patch), and it then built 
on 64-bit Cygwin.  Here's the result of 'make check':

Entering directory 
Test passed.
PASS: sigsegv1.exe
Test passed.
PASS: sigsegv2.exe
Doing SIGSEGV pass 1.
Stack overflow 1 caught.
Doing SIGSEGV pass 2.
Stack overflow 2 caught.
Test passed.
PASS: sigsegv3.exe
SKIP: stackoverflow1.exe
SKIP: stackoverflow2.exe
All 3 tests passed
(2 tests were not run)
Please send the following summary line via email to the main author
Bruno Haible <bruno@clisp.org> for inclusion into the list of
successfully tested platforms (see PORTING file).

libsigsegv: x86_64-unknown-cygwin | yes | no | 2.10

> I'm not the cygwin packager for libsigsegv,

No one is; it's orphaned.

> but am one of the upstream
> contributors, and so this thread has piqued my interest.

So it seems that you would be the obvious person to maintain it, if you have the 
time.  If you don't have the time, I'd be willing to ITA it just to get it into 
the 64-bit distro.  But in that case I'd appreciate it if you would review my 
build after I send the ITA, since you actually know something about libsigsegv, 
and I don't.

> Sadly, I'm a
> bit late to the testing because I was on vacation last month, and am now
> trying to catch up with several things that happened during my
> (much-needed) downtime, such as a new upstream release of coreutils.

-------------- next part --------------
--- origsrc/libsigsegv-2.10/configure.ac	2015-07-14 20:32:45.036228200 -0400
+++ src/libsigsegv-2.10/configure.ac	2015-07-14 20:42:36.489057300 -0400
@@ -522,19 +522,6 @@ case "$host_os" in
     FAULT_CONTEXT_INCLUDE='#include <windows.h>'
     CFG_FAULT=fault-win32.h # nonexistent, just a dummy
-  cygwin*)
-    # CONTEXT is defined in <windows.h>, but cygwin programs should not
-    # normally inspect the contents of CONTEXT, and the outright inclusion
-    # of <windows.h> pollutes the namespace.
-    # Cygwin 1.7 uses fault-posix.h. Cygwin 1.5.x needs a hacky workaround.
-    if test -z "$CFG_FAULT"; then
-      CFG_FAULT=fault-cygwin-old.h
-        [Define to 1 on Cygwin versions older than 1.7.])
-    fi
-    ;;
 if test -n "$CFG_FAULT"; then
@@ -861,7 +848,7 @@ AC_CACHE_CHECK([if the system supports c
     case "$host_os" in
-      mingw* | cygwin*) sv_cv_have_stack_overflow_recovery=yes ;;
+      mingw*) sv_cv_have_stack_overflow_recovery=yes ;;
         if test "$CFG_LEAVE" != 'leave-none.c'; then
           if test "$sv_cv_sigaltstack" != no; then
@@ -930,7 +917,7 @@ dnl Requires AC_CANONICAL_HOST, CFG_HAND
 case "$host_os" in
-  mingw* | cygwin*) CFG_HANDLER=handler-win32.c ;;
+  mingw*) CFG_HANDLER=handler-win32.c ;;
     if test -z "$CFG_HANDLER"; then
       if test $sv_cv_have_sigsegv_recovery = no \
@@ -961,7 +948,6 @@ dnl should make the system call fail wit
 dnl the signal handler.
 dnl It is necessary on Cygwin: otherwise the cygwin1 test fails.
 case "$host_os" in
-  cygwin*) enable_EFAULT=yes ;;
   *)       enable_EFAULT=no ;;
 if test $enable_EFAULT = yes; then
--- origsrc/libsigsegv-2.10/tests/Makefile.am	2010-10-24 13:25:15.000000000 -0400
+++ src/libsigsegv-2.10/tests/Makefile.am	2015-07-14 21:37:25.864937900 -0400
@@ -29,11 +29,6 @@ DEFS = @DEFS@
 LDADD = ../src/libsigsegv.la
 noinst_PROGRAMS = sigsegv1 sigsegv2 sigsegv3 stackoverflow1 stackoverflow2
-TESTS += cygwin1
-noinst_PROGRAMS += cygwin1
 TESTS += efault1 efault2 efault3
 noinst_PROGRAMS += efault1 efault2 efault3
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