X-Recipient: archive-cygwin AT delorie DOT com X-SWARE-Spam-Status: No, hits=-5.2 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FROM,KHOP_RCVD_TRUST,KHOP_THREADED,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE X-Spam-Check-By: sourceware.org Message-ID: <4FD50A3D.9040201@users.sourceforge.net> Date: Sun, 10 Jun 2012 15:57:33 -0500 From: "Yaakov (Cygwin/X)" User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: cygwin AT cygwin DOT com Subject: Re: make: .exe handling breaks kernel cross-compile References: <4FD4E21A DOT 2080809 AT users DOT sourceforge DOT net> <20120610182927 DOT GB32575 AT ednor DOT casa DOT cgf DOT cx> In-Reply-To: <20120610182927.GB32575@ednor.casa.cgf.cx> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com On 2012-06-10 13:29, Christopher Faylor wrote: > On Sun, Jun 10, 2012 at 01:06:18PM -0500, Yaakov (Cygwin/X) wrote: >> I can confirm that this previously reported bug in make .exe handling >> still affects the cross-compile of the Linux kernel: >> >> http://cygwin.com/ml/cygwin/2009-11/msg00935.html > > Without diving into the depths of the linux makefiles, this doesn't seem > like a bug. gcc creates .exe files. The makefile isn't expecting to > create one and, so, gets confused. Makefiles which expect .exe > extensions usually use the EXEEXT variable for just this purpose. > Linux's makefile doesn't do that for probably obvious reasons. While our make won't connect a dep on "foo" to a foo.exe rule (which can occur in automake-generated Makefiles with custom rules), it does see foo.exe fulfilling a dep on "foo" if it is already present: $ cat Makefile all: bar bar: foo touch bar.exe clean: rm -f bar.exe foo.exe $ touch foo.exe $ make touch bar.exe $ make clean rm -f bar.exe foo.exe The problem here is the kernel uses VPATH -- scripts/pnmtologo(.exe) is not relative to drivers/video/logo, but rather to $(O) -- and somehow with VPATH the .exe magic doesn't happen: $ cat Makefile VPATH = $(PWD)/build all: bar bar: foo touch bar.exe $ mkdir -p build $ touch build/foo.exe $ make make: *** No rule to make target `foo', needed by `bar'. Stop. So foo.exe fulfills foo, but not with VPATH. Isn't that a bug? Yaakov -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple