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Date: Wed, 29 Jan 2020 22:46:53 +0900
From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin@cygwin.com
Subject: Re: headache on build repeatibility: octave vs BLODA ?
Message-Id: <20200129224653.b3238736661d3c95fc30ee5f@nifty.ne.jp>
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Hi Marco,

On Wed, 29 Jan 2020 13:19:11 +0100
Marco Atzeri wrote:
> As Octave uses gnulib, it is possible that the changes in MS are causing
> a different subset of gnulib to be used than before, may be exposing
> a latent bug or race.
> 
> Unfortunately my old build tree was polluted by mistake, so I can
> not directly compare a good build tree versus a failing one.

I found suspicious difference between the working build and the
not-working build.

The not-working build has fflush.o, fseek.o and fseeko.o in
build/libgnu/.libs
directory, while the working build does not.

Also, cygoctave-7.dll of not-working build exports rpl_fflush,
rpl_fseek and rpl_fseeko, while that of the working build does
not.

As a test, I used following patch to forcibly remove the code
setting REPLACE_FSEEKO to 1 in configure script, and rebuilt
octave. This works without segmentation fault.

I do not look into the reason why this difference causes yet.

I would be happy if this could help.

--- m4/fseeko.m4.orig   2020-01-29 21:39:37.280507900 +0900
+++ m4/fseeko.m4        2020-01-29 21:36:29.263747100 +0900
@@ -30,16 +30,19 @@
     HAVE_FSEEKO=0
   else
     if test $WINDOWS_64_BIT_OFF_T = 1; then
-      REPLACE_FSEEKO=1
+      dnl REPLACE_FSEEKO=1
+      REPLACE_FSEEKO=0
     fi
     if test $gl_cv_var_stdin_large_offset = no; then
-      REPLACE_FSEEKO=1
+      dnl REPLACE_FSEEKO=1
+      REPLACE_FSEEKO=0
     fi
     m4_ifdef([gl_FUNC_FFLUSH_STDIN], [
       gl_FUNC_FFLUSH_STDIN
       case "$gl_cv_func_fflush_stdin" in
         *yes) ;;
-        *) REPLACE_FSEEKO=1 ;;
+        dnl *) REPLACE_FSEEKO=1 ;;
+        *) REPLACE_FSEEKO=0 ;;
       esac
     ])
   fi
--- m4/fflush.m4.orig   2020-01-29 21:40:07.546238000 +0900
+++ m4/fflush.m4        2020-01-29 21:38:02.079793700 +0900
@@ -16,7 +16,8 @@
   gl_FUNC_FFLUSH_STDIN
   case "$gl_cv_func_fflush_stdin" in
     *yes) ;;
-    *) REPLACE_FFLUSH=1 ;;
+    dnl *) REPLACE_FFLUSH=1 ;;
+    *) REPLACE_FFLUSH=0 ;;
   esac
 ])
 

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>

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