* make: .exe handling breaks kernel cross-compile
@ 2012-06-10 18:06 Yaakov (Cygwin/X)
2012-06-10 18:29 ` Christopher Faylor
0 siblings, 1 reply; 6+ messages in thread
From: Yaakov (Cygwin/X) @ 2012-06-10 18:06 UTC (permalink / raw)
To: cygwin
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
Yaakov
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: make: .exe handling breaks kernel cross-compile
2012-06-10 18:06 make: .exe handling breaks kernel cross-compile Yaakov (Cygwin/X)
@ 2012-06-10 18:29 ` Christopher Faylor
2012-06-10 20:57 ` Yaakov (Cygwin/X)
0 siblings, 1 reply; 6+ messages in thread
From: Christopher Faylor @ 2012-06-10 18:29 UTC (permalink / raw)
To: cygwin
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.
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* Re: make: .exe handling breaks kernel cross-compile
2012-06-10 18:29 ` Christopher Faylor
@ 2012-06-10 20:57 ` Yaakov (Cygwin/X)
2012-06-11 4:26 ` Christopher Faylor
0 siblings, 1 reply; 6+ messages in thread
From: Yaakov (Cygwin/X) @ 2012-06-10 20:57 UTC (permalink / raw)
To: cygwin
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
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: make: .exe handling breaks kernel cross-compile
2012-06-10 20:57 ` Yaakov (Cygwin/X)
@ 2012-06-11 4:26 ` Christopher Faylor
2012-06-11 6:04 ` Yaakov (Cygwin/X)
0 siblings, 1 reply; 6+ messages in thread
From: Christopher Faylor @ 2012-06-11 4:26 UTC (permalink / raw)
To: cygwin
On Sun, Jun 10, 2012 at 03:57:33PM -0500, Yaakov (Cygwin/X) wrote:
>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?
If there is a bug it is with make ever equating foo.exe with foo. It's
undoubtedly happening because of Cygwin's attempts at transparency.
I'm not kidding about EXEEXT. Surely you know about this from having
maintained cygport.
cgf
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: make: .exe handling breaks kernel cross-compile
2012-06-11 4:26 ` Christopher Faylor
@ 2012-06-11 6:04 ` Yaakov (Cygwin/X)
2012-06-11 14:43 ` Christopher Faylor
0 siblings, 1 reply; 6+ messages in thread
From: Yaakov (Cygwin/X) @ 2012-06-11 6:04 UTC (permalink / raw)
To: cygwin
On 2012-06-10 23:26, Christopher Faylor wrote:
> If there is a bug it is with make ever equating foo.exe with foo. It's
> undoubtedly happening because of Cygwin's attempts at transparency.
>
> I'm not kidding about EXEEXT. Surely you know about this from having
> maintained cygport.
Am I ever, but I suspect *you* know that incorporating EXEEXT into the
Linux kernel buildsystem will likely never be accepted upstream.
That being said, I do have another patch which might have a chance, so
the last hurdle from our side is in regex, per my previous thread.
Yaakov
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: make: .exe handling breaks kernel cross-compile
2012-06-11 6:04 ` Yaakov (Cygwin/X)
@ 2012-06-11 14:43 ` Christopher Faylor
0 siblings, 0 replies; 6+ messages in thread
From: Christopher Faylor @ 2012-06-11 14:43 UTC (permalink / raw)
To: cygwin
On Mon, Jun 11, 2012 at 01:04:22AM -0500, Yaakov (Cygwin/X) wrote:
>>
>On 2012-06-10 23:26, Christopher Faylor wrote:
>> If there is a bug it is with make ever equating foo.exe with foo. It's
>> undoubtedly happening because of Cygwin's attempts at transparency.
>>
>> I'm not kidding about EXEEXT. Surely you know about this from having
>> maintained cygport.
>
>Am I ever, but I suspect *you* know that incorporating EXEEXT into the
>Linux kernel buildsystem will likely never be accepted upstream.
>>On 2012-06-10 14:29, Christopher Faylor wrote:
>>>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.
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-06-11 14:43 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2012-06-10 18:06 make: .exe handling breaks kernel cross-compile Yaakov (Cygwin/X)
2012-06-10 18:29 ` Christopher Faylor
2012-06-10 20:57 ` Yaakov (Cygwin/X)
2012-06-11 4:26 ` Christopher Faylor
2012-06-11 6:04 ` Yaakov (Cygwin/X)
2012-06-11 14:43 ` Christopher Faylor
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