The build of emacs from cvs source recently started failing because the
build system added autodepend support. The associated configure test
succeeds, but the feature itself doesn't work reliably. The simple
workaround is to configure with --disable-autodepend, but I thought I
should report this in case it indicates a cygwin problem and/or an
autoconf problem. Of course, I'd also like to know if it's an emacs
problem so I can report it to them.
Here's the relevant excerpt from configure.in:
if test $HAVE_GNU_MAKE = yes; then
AC_MSG_CHECKING([whether gcc understands -MMD -MF])
SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -MMD -MF deps.d"
AC_TRY_COMPILE([], [], , ac_enable_autodepend=no)
CFLAGS="$SAVE_CFLAGS"
test -f deps.d || ac_enable_autodepend=no
rm -rf deps.d
AC_MSG_RESULT([$ac_enable_autodepend])
fi
if test $ac_enable_autodepend = yes; then
AC_DEFINE(AUTO_DEPEND, 1, [Generate dependencies with gcc.])
fi
And here's the build failure:
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 -g -O2 -Wdeclaration-after-statement
-Wno-pointer-sign -MMD -MF deps/ecrt0.d /tmp/emacs/src/ecrt0.c
/tmp/emacs/src/ecrt0.c:106: fatal error: opening dependency file
deps/ecrt0.d: No such file or directory
Ken
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