Re: Bootstrap failure using 'make -j4' [Cygwin]

[Angelo Graziosi <angelo.graziosi@alice.it>]

Il 21/05/2010 18.16, Eli Zaretskii ha scritto:
>> Date: Fri, 21 May 2010 16:53:15 +0200
>> From: Angelo Graziosi<angelo.graziosi@alice.it>
>>
>> Today, trying to bootstrap Emacs trunk (rev. 100406), using 'make -j4',
>> fails always in the same manner:
>
> Thanks for the report, but where's the relevant data?  It fails
> compiling dispnew.c, but the portion of the build you show relates to
> frame.c, not to dispnew.c.  Please show more.
>
>> I have done many tries... It looks as if, with 'make -j4', it avoids to
>> compile dispnew.c. Indeed I obtain
>>
>> $ grep dispnew build-emacs-gtk-24.0.50-r100405.log
>> make[2]: *** [dispnew.o] Error 1
>
> It doesn't avoid.  It tries to compile it, but the compilation fails
> for some reason.  The question is what is the reason.  Seeing the
> compiler command and its output might help.

Hmm... perhaps I wasn't clear.

In the build log there is *not* track of the command to compile 
dispnew.c: as you see 'grep' finds only

make[2]: *** [dispnew.o] Error 1

But this happens *only* with 'make -j4'! I one uses 'make -j2' the 
bootstrap is completed and works, and 'dispnew.c' is compiled 
successfully with:

gcc -c  -Demacs -DHAVE_CONFIG_H  -I. -I/tmp/emacs/src 
-I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 
-I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 
-I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 
-I/usr/include/freetype2 -I/usr/include/libpng12 
-I/usr/include/freetype2     -I/usr/include/librsvg-2 
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include 
-I/usr/include/gtk-2.0 -I/usr/include/cairo -I/usr/include/pixman-1 
-I/usr/include/freetype2 -I/usr/include/libpng12 
-I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include   -DORBIT2=1 
-D_REENTRANT -I/usr/include/gconf/2 -I/usr/include/orbit-2.0 
-I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include 
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include   -g -O2 
-Wdeclaration-after-statement -Wno-pointer-sign       -MMD -MF 
deps/dispnew.d /tmp/emacs/src/dispnew.c


I know that with '-j4' some time the build can fail, mainly if the CPU 
is doing other things, and re-trying often solves. But in this case the 
CPU was working only for Emacs bootstrap and trying many times did not 
solve: it fails always in the same manner. Only using '-j2' did solve!

It is at least two years I use 'make -j4' on Cygwin to bootstrap Emacs 
without problems (indeed it worked a week ago...)

Ciao,
Angelo.