Re: Build 0.6 version fail on musl libc

["Milan P. Stanić" <mps@arvanta.net>]

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On Wed, 2020-04-29 at 14:43, Jens Axboe wrote:
> On 4/29/20 2:38 PM, Milan P. Stanić wrote:
> > On Wed, 2020-04-29 at 14:08, Jens Axboe wrote:
> >> On 4/29/20 2:01 PM, Milan P. Stanić wrote:
> >>> On Wed, 2020-04-29 at 13:38, Jens Axboe wrote:
> >>>> On 4/29/20 1:33 PM, Milan P. Stanić wrote:
> >>>>> On Wed, 2020-04-29 at 10:14, Jens Axboe wrote:
> >>>>>> On 4/29/20 9:29 AM, Jens Axboe wrote:
> >>>>>>> On 4/29/20 9:26 AM, Christoph Hellwig wrote:
> >>>>>>>> On Wed, Apr 29, 2020 at 09:24:40AM -0600, Jens Axboe wrote:
> >>>>>>>>>
> >>>>>>>>> Not sure what the best fix is there, for 32-bit, your change will truncate
> >>>>>>>>> the offset to 32-bit as off_t is only 4 bytes there. At least that's the
> >>>>>>>>> case for me, maybe musl is different if it just has a nasty define for
> >>>>>>>>> them.
> >>>>>>>>>
> >>>>>>>>> Maybe best to just make them uint64_t or something like that.
> >>>>>>>>
> >>>>>>>> The proper LFS type would be off64_t.
> >>>>>>>
> >>>>>>> Is it available anywhere? Because I don't have it.
> >>>>>>
> >>>>>> There seems to be better luck with __off64_t, but I don't even know
> >>>>>> how widespread that is... Going to give it a go, we'll see.
> >>>>>
> >>>>> AFAIK, __off64_t is glibc specific, defined in /usr/include/fcntl.h:
> >>>>> ------
> >>>>> # ifndef __USE_FILE_OFFSET64
> >>>>> typedef __off_t off_t;
> >>>>> # else
> >>>>> typedef __off64_t off_t;
> >>>>> # endif
> >>>>> ------
> >>>>>
> >>>>> So, this will not work on musl based Linux system, git commit id
> >>>>> b5096098c62adb19dbf4a39b480909766c9026e7 should be reverted. But you
> >>>>> know better what to do.
> >>>>>
> >>>>> I come with another quick and dirty patch attached to this mail but
> >>>>> again  I think it is not proper solution, just playing to find (maybe)
> >>>>> 'good enough' workaround.
> >>>>
> >>>> Let's just use uint64_t.
> >>>
> >>> This works. Thanks.
> >>>
> >>> Next issue is this:
> >>> ----
> >>> make[1]: Entering directory '/work/devel/liburing/src'
> >>>      CC setup.ol
> >>>      CC queue.ol
> >>>      CC syscall.ol
> >>> In file included from syscall.c:9:
> >>> include/liburing/compat.h:6:2: error: unknown type name 'int64_t'
> >>>     6 |  int64_t  tv_sec;
> >>>       |  ^~~~~~~
> >>> make[1]: *** [Makefile:43: syscall.ol] Error 1
> >>> make[1]: Leaving directory '/work/devel/liburing/src'
> >>> make: *** [Makefile:12: all] Error 2
> >>> ----
> >>>
> >>> I fixed it with this patch:
> >>> --
> >>> diff --git a/configure b/configure
> >>> index 30b0a5a..4b44177 100755
> >>> --- a/configure
> >>> +++ b/configure
> >>> @@ -301,6 +301,7 @@ EOF
> >>>  fi
> >>>  if test "$__kernel_timespec" != "yes"; then
> >>>  cat >> $compat_h << EOF
> >>> +#include <stdint.h>
> >>>  struct __kernel_timespec {
> >>>   int64_t   tv_sec;
> >>>   long long tv_nsec;
> >>> --
> >>>
> >>> but not sure will that work on glibc.
> >>
> >> That should work fine on glibc. Care to send as an actual
> >> patch, with commit message and signed-off-by? Then I'll add
> >> it to liburing.
> > patch is attached.
> Great thanks, I added a bit to your commit message. Here it is:
> https://git.kernel.dk/cgit/liburing/commit/?id=8171778c835b6be517c314cf23dd1f5ae061a117

Yet another issue, build also fails when make enter test subdir saying
../src/include/liburing.h:339:35: error: unknown type name 'mode_t'

I'm attaching build log as liburing-test.log file and patch file
liburing-fix-mode_t.diff  where I added
#include <sys/stat.h> in src/include/liburing.h

After adding this patch 'make' pass build and test, but fails in
examples subdir, but this is not big problem.

Maybe you would consider changes in make to have separate invocation for
make (just build lib), make test and make examples. Will be easier for
distribution maintainers.

Thanks

-- 
regards

[-- Attachment #2: liburing-test.log --]
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make[1]: Entering directory '/work/devel/liburing/src'
     CC setup.ol
     CC queue.ol
     CC syscall.ol
     CC register.ol
     AR liburing.a
ar: creating liburing.a
 RANLIB liburing.a
     CC setup.os
     CC queue.os
     CC syscall.os
     CC register.os
     CC liburing.so.1.0.6
make[1]: Leaving directory '/work/devel/liburing/src'
make[1]: Entering directory '/work/devel/liburing/test'
     CC poll
In file included from poll.c:12:
/usr/include/sys/poll.h:1:2: warning: #warning redirecting incorrect #include <sys/poll.h> to <poll.h> [-Wcpp]
    1 | #warning redirecting incorrect #include <sys/poll.h> to <poll.h>
      |  ^~~~~~~
In file included from poll.c:15:
../src/include/liburing.h:339:35: error: unknown type name 'mode_t'
  339 |      const char *path, int flags, mode_t mode)
      |                                   ^~~~~~
make[1]: *** [Makefile:39: poll] Error 1
make[1]: Leaving directory '/work/devel/liburing/test'
make: *** [Makefile:13: all] Error 2

[-- Attachment #3: liburing-fix-mode_t.diff --]
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From 9315276edc5d241369442e29c94091f4c1c8faa2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Milan=20P=2E=20Stani=C4=87?= <mps@arvanta.net>
Date: Thu, 30 Apr 2020 16:23:30 +0200
Subject: [PATCH] fix missing '#include <sys/stat.h>' in
 'src/include/liburing.h
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

make failed on musl libc system when entering test subdir with this:
-----
make[1]: Entering directory '/work/devel/liburing/test'
     CC poll
In file included from poll.c:12:
/usr/include/sys/poll.h:1:2: warning: #warning redirecting incorrect #include <sys/poll.h> to <poll.h> [-Wcpp]
    1 | #warning redirecting incorrect #include <sys/poll.h> to <poll.h>
      |  ^~~~~~~
In file included from poll.c:15:
../src/include/liburing.h:339:35: error: unknown type name 'mode_t'
  339 |      const char *path, int flags, mode_t mode)
      |                                   ^~~~~~
make[1]: *** [Makefile:39: poll] Error 1
make[1]: Leaving directory '/work/devel/liburing/test'
make: *** [Makefile:13: all] Error 2
-----

adding #include <sys/stat.h> to src/include/liburing.h fixes build

Signed-off-by: Milan P. Stanić <mps@arvanta.net>
---
 src/include/liburing.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/include/liburing.h b/src/include/liburing.h
index 56e32d7..dd85f7b 100644
--- a/src/include/liburing.h
+++ b/src/include/liburing.h
@@ -8,6 +8,7 @@ extern "C" {
 
 #include <sys/socket.h>
 #include <sys/uio.h>
+#include <sys/stat.h>
 #include <signal.h>
 #include <inttypes.h>
 #include <time.h>
-- 
2.24.3