[Buildroot] modem-manager: build issue

[Buildroot] modem-manager: build issue

[Yegor Yefremov]

Current mm 1.6.12 produces following errors both when compiling an ARM
or MIPS target:

  CC       ModemManager-mm-base-modem.o
mm-base-manager.c: In function ?handle_set_logging?:
mm-base-manager.c:680:15: error: assignment from incompatible pointer
type [-Werror=incompatible-pointer-types]
     ctx->self = g_object_ref (manager);
               ^
mm-base-manager.c: In function ?handle_scan_devices?:
mm-base-manager.c:736:15: error: assignment from incompatible pointer
type [-Werror=incompatible-pointer-types]
     ctx->self = g_object_ref (manager);
               ^
mm-device.c: In function ?mm_device_get_plugin?:
mm-device.c:628:12: error: return from incompatible pointer type
[-Werror=incompatible-pointer-types]
     return (self->priv->plugin ?

So far I've seen only one build failure in our autobuilders [0]. I can
reproduce this error building mm 1.6.12 locally with my host GCC. But
the master branch of mm compiles without any issue. We don't seem to
be the only ones who is affected [1], [2].

Any ideas?

[0] http://autobuild.buildroot.net/results/5d9e299ff12726d07e8a584a213c1d2a2e419594/
[1] https://fedorapeople.org/groups/risc-v/logs/ModemManager-1.6.12-3.fc28.src.rpm/build.log
[2] https://www.linuxquestions.org/questions/slackware-14/slackware-from-scratch-and-x11-4175560702/page19.html

Yegor

[Buildroot] modem-manager: build issue

[Thomas Petazzoni]

Hello,

On Wed, 18 Apr 2018 14:32:06 +0200, Yegor Yefremov wrote:
> Current mm 1.6.12 produces following errors both when compiling an ARM
> or MIPS target:
> 
>   CC       ModemManager-mm-base-modem.o
> mm-base-manager.c: In function ?handle_set_logging?:
> mm-base-manager.c:680:15: error: assignment from incompatible pointer
> type [-Werror=incompatible-pointer-types]
>      ctx->self = g_object_ref (manager);
>                ^
> mm-base-manager.c: In function ?handle_scan_devices?:
> mm-base-manager.c:736:15: error: assignment from incompatible pointer
> type [-Werror=incompatible-pointer-types]
>      ctx->self = g_object_ref (manager);
>                ^
> mm-device.c: In function ?mm_device_get_plugin?:
> mm-device.c:628:12: error: return from incompatible pointer type
> [-Werror=incompatible-pointer-types]
>      return (self->priv->plugin ?
> 
> So far I've seen only one build failure in our autobuilders [0]. I can
> reproduce this error building mm 1.6.12 locally with my host GCC. But
> the master branch of mm compiles without any issue. We don't seem to
> be the only ones who is affected [1], [2].
> 
> Any ideas?

Yes:
https://git.buildroot.org/buildroot/commit/?id=f9b6ec3b59746f3eddd387772ad60aa6bc52aa60

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

[Buildroot] modem-manager: build issue

[Yegor Yefremov]

On Wed, Apr 18, 2018 at 3:30 PM, Thomas Petazzoni
<thomas.petazzoni@bootlin.com> wrote:
> Hello,
>
> On Wed, 18 Apr 2018 14:32:06 +0200, Yegor Yefremov wrote:
>> Current mm 1.6.12 produces following errors both when compiling an ARM
>> or MIPS target:
>>
>>   CC       ModemManager-mm-base-modem.o
>> mm-base-manager.c: In function ?handle_set_logging?:
>> mm-base-manager.c:680:15: error: assignment from incompatible pointer
>> type [-Werror=incompatible-pointer-types]
>>      ctx->self = g_object_ref (manager);
>>                ^
>> mm-base-manager.c: In function ?handle_scan_devices?:
>> mm-base-manager.c:736:15: error: assignment from incompatible pointer
>> type [-Werror=incompatible-pointer-types]
>>      ctx->self = g_object_ref (manager);
>>                ^
>> mm-device.c: In function ?mm_device_get_plugin?:
>> mm-device.c:628:12: error: return from incompatible pointer type
>> [-Werror=incompatible-pointer-types]
>>      return (self->priv->plugin ?
>>
>> So far I've seen only one build failure in our autobuilders [0]. I can
>> reproduce this error building mm 1.6.12 locally with my host GCC. But
>> the master branch of mm compiles without any issue. We don't seem to
>> be the only ones who is affected [1], [2].
>>
>> Any ideas?
>
> Yes:
> https://git.buildroot.org/buildroot/commit/?id=f9b6ec3b59746f3eddd387772ad60aa6bc52aa60

I already have this commit and I've used various GCC versions > 4.7
i.e. 5.x and 7.x

Yegor

[Buildroot] modem-manager: build issue

[Thomas Petazzoni]

Hello,

On Wed, 18 Apr 2018 15:36:44 +0200, Yegor Yefremov wrote:

> > On Wed, 18 Apr 2018 14:32:06 +0200, Yegor Yefremov wrote:  
> >> Current mm 1.6.12 produces following errors both when compiling an ARM
> >> or MIPS target:
> >>
> >>   CC       ModemManager-mm-base-modem.o
> >> mm-base-manager.c: In function ?handle_set_logging?:
> >> mm-base-manager.c:680:15: error: assignment from incompatible pointer
> >> type [-Werror=incompatible-pointer-types]
> >>      ctx->self = g_object_ref (manager);
> >>                ^
> >> mm-base-manager.c: In function ?handle_scan_devices?:
> >> mm-base-manager.c:736:15: error: assignment from incompatible pointer
> >> type [-Werror=incompatible-pointer-types]
> >>      ctx->self = g_object_ref (manager);
> >>                ^
> >> mm-device.c: In function ?mm_device_get_plugin?:
> >> mm-device.c:628:12: error: return from incompatible pointer type
> >> [-Werror=incompatible-pointer-types]
> >>      return (self->priv->plugin ?
> >>
> >> So far I've seen only one build failure in our autobuilders [0]. I can
> >> reproduce this error building mm 1.6.12 locally with my host GCC. But
> >> the master branch of mm compiles without any issue. We don't seem to
> >> be the only ones who is affected [1], [2].
> >>
> >> Any ideas?  
> >
> > Yes:
> > https://git.buildroot.org/buildroot/commit/?id=f9b6ec3b59746f3eddd387772ad60aa6bc52aa60  
> 
> I already have this commit and I've used various GCC versions > 4.7
> i.e. 5.x and 7.x

Then I don't know. I assume reverting the commit doesn't change
anything (it shouldn't) ? If it doesn't, then investigation needed, I
don't have an immediate answer, sorry :-/

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

[Buildroot] modem-manager: build issue

[Carlos Santos]

> From: "Yegor Yefremov" <yegorslists@googlemail.com>
> To: "buildroot" <buildroot@buildroot.org>
> Cc: "Thomas Petazzoni" <thomas.petazzoni@free-electrons.com>, "Carlos Santos" <casantos@datacom.ind.br>, "Aleksander
> Morgado" <aleksander@aleksander.es>
> Sent: Wednesday, April 18, 2018 9:32:06 AM
> Subject: modem-manager: build issue

> Current mm 1.6.12 produces following errors both when compiling an ARM
> or MIPS target:
> 
>  CC       ModemManager-mm-base-modem.o
> mm-base-manager.c: In function ?handle_set_logging?:
> mm-base-manager.c:680:15: error: assignment from incompatible pointer
> type [-Werror=incompatible-pointer-types]
>     ctx->self = g_object_ref (manager);
>               ^
> mm-base-manager.c: In function ?handle_scan_devices?:
> mm-base-manager.c:736:15: error: assignment from incompatible pointer
> type [-Werror=incompatible-pointer-types]
>     ctx->self = g_object_ref (manager);
>               ^
> mm-device.c: In function ?mm_device_get_plugin?:
> mm-device.c:628:12: error: return from incompatible pointer type
> [-Werror=incompatible-pointer-types]
>     return (self->priv->plugin ?
> 
> So far I've seen only one build failure in our autobuilders [0]. I can
> reproduce this error building mm 1.6.12 locally with my host GCC. But
> the master branch of mm compiles without any issue. We don't seem to
> be the only ones who is affected [1], [2].
> 
> Any ideas?
> 
> [0]
> http://autobuild.buildroot.net/results/5d9e299ff12726d07e8a584a213c1d2a2e419594/
> [1]
> https://fedorapeople.org/groups/risc-v/logs/ModemManager-1.6.12-3.fc28.src.rpm/build.log
> [2]
> https://www.linuxquestions.org/questions/slackware-14/slackware-from-scratch-and-x11-4175560702/page19.html
> 
> Yegor

I'm quite busy right now but will try to reproduce the error tonight.

-- 
Carlos Santos (Casantos) - DATACOM, P&D
?The greatest triumph that modern PR can offer is the transcendent 
success of having your words and actions judged by your reputation, 
rather than the other way about.? ? Christopher Hitchens

[Buildroot] modem-manager: build issue

[Carlos Santos]

> From: "Carlos Santos" <casantos@datacom.ind.br>
> To: "Yegor Yefremov" <yegorslists@googlemail.com>
> Cc: "Thomas Petazzoni" <thomas.petazzoni@free-electrons.com>, "Aleksander Morgado" <aleksander@aleksander.es>,
> "buildroot" <buildroot@buildroot.org>
> Sent: Wednesday, April 18, 2018 11:33:42 AM
> Subject: Re: [Buildroot] modem-manager: build issue

>> From: "Yegor Yefremov" <yegorslists@googlemail.com>
>> To: "buildroot" <buildroot@buildroot.org>
>> Cc: "Thomas Petazzoni" <thomas.petazzoni@free-electrons.com>, "Carlos Santos"
>> <casantos@datacom.ind.br>, "Aleksander
>> Morgado" <aleksander@aleksander.es>
>> Sent: Wednesday, April 18, 2018 9:32:06 AM
>> Subject: modem-manager: build issue
> 
>> Current mm 1.6.12 produces following errors both when compiling an ARM
>> or MIPS target:
>> 
>>  CC       ModemManager-mm-base-modem.o
>> mm-base-manager.c: In function ?handle_set_logging?:
>> mm-base-manager.c:680:15: error: assignment from incompatible pointer
>> type [-Werror=incompatible-pointer-types]
>>     ctx->self = g_object_ref (manager);
>>               ^
>> mm-base-manager.c: In function ?handle_scan_devices?:
>> mm-base-manager.c:736:15: error: assignment from incompatible pointer
>> type [-Werror=incompatible-pointer-types]
>>     ctx->self = g_object_ref (manager);
>>               ^
>> mm-device.c: In function ?mm_device_get_plugin?:
>> mm-device.c:628:12: error: return from incompatible pointer type
>> [-Werror=incompatible-pointer-types]
>>     return (self->priv->plugin ?
>> 
>> So far I've seen only one build failure in our autobuilders [0]. I can
>> reproduce this error building mm 1.6.12 locally with my host GCC. But
>> the master branch of mm compiles without any issue. We don't seem to
>> be the only ones who is affected [1], [2].
>> 
>> Any ideas?
>> 
>> [0]
>> http://autobuild.buildroot.net/results/5d9e299ff12726d07e8a584a213c1d2a2e419594/
>> [1]
>> https://fedorapeople.org/groups/risc-v/logs/ModemManager-1.6.12-3.fc28.src.rpm/build.log
>> [2]
>> https://www.linuxquestions.org/questions/slackware-14/slackware-from-scratch-and-x11-4175560702/page19.html
>> 
>> Yegor
> 
> I'm quite busy right now but will try to reproduce the error tonight.

There is a macro defined in build/libglib2-2.56.1/gobject/gobject.h which
leads to the assignment errors:

  511 /* Make reference APIs type safe with macros */
  512 #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))

The problem can be easily reproduced with this sample code:

$ cat /tmp/test.c
extern void *g_object_ref(void *);

/* Make reference APIs type safe with macros */
#define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))

extern double *new_double(int *);

double *new_double(int *ip) {
  double *dp;
  dp = g_object_ref(ip);
  return dp;
}

$ gcc -Wall -Werror -c /tmp/test.c -o /tmp/test.o
/tmp/test.c: In function ?new_context?:
/tmp/test.c:19:13: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
   ctx->self = g_object_ref(om);
             ^
cc1: all warnings being treated as errors

So in order to fix the build of ModemManager it would be necessary to either
compile it without -Werror (with the risk of letting undesired assignments
happen) or fix all the occurrences of the offending assignments.

-- 
Carlos Santos (Casantos) - DATACOM, P&D
?The greatest triumph that modern PR can offer is the transcendent 
success of having your words and actions judged by your reputation, 
rather than the other way about.? ? Christopher Hitchens

[Buildroot] modem-manager: build issue

[Thomas Petazzoni]

Hello,

On Fri, 20 Apr 2018 00:23:13 -0300 (BRT), Carlos Santos wrote:

> There is a macro defined in build/libglib2-2.56.1/gobject/gobject.h which
> leads to the assignment errors:
> 
>   511 /* Make reference APIs type safe with macros */
>   512 #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))
> 
> The problem can be easily reproduced with this sample code:
> 
> $ cat /tmp/test.c
> extern void *g_object_ref(void *);
> 
> /* Make reference APIs type safe with macros */
> #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))
> 
> extern double *new_double(int *);
> 
> double *new_double(int *ip) {
>   double *dp;
>   dp = g_object_ref(ip);
>   return dp;
> }
> 
> $ gcc -Wall -Werror -c /tmp/test.c -o /tmp/test.o
> /tmp/test.c: In function ?new_context?:
> /tmp/test.c:19:13: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
>    ctx->self = g_object_ref(om);
>              ^
> cc1: all warnings being treated as errors

Thanks for the investigation!

> So in order to fix the build of ModemManager it would be necessary to either
> compile it without -Werror (with the risk of letting undesired assignments
> happen) or fix all the occurrences of the offending assignments.

If the patch to fix all the occurrences is small enough, we can do this
in Buildroot, and submit upstream.

If the patch is larger, then disabling -Werror is a better solution for
us, and report the issue upstream (or contribute the fix).

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

[Buildroot] modem-manager: build issue

[Yegor Yefremov]

On Fri, Apr 20, 2018 at 8:38 AM, Thomas Petazzoni
<thomas.petazzoni@bootlin.com> wrote:
> Hello,
>
> On Fri, 20 Apr 2018 00:23:13 -0300 (BRT), Carlos Santos wrote:
>
>> There is a macro defined in build/libglib2-2.56.1/gobject/gobject.h which
>> leads to the assignment errors:
>>
>>   511 /* Make reference APIs type safe with macros */
>>   512 #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))
>>
>> The problem can be easily reproduced with this sample code:
>>
>> $ cat /tmp/test.c
>> extern void *g_object_ref(void *);
>>
>> /* Make reference APIs type safe with macros */
>> #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))
>>
>> extern double *new_double(int *);
>>
>> double *new_double(int *ip) {
>>   double *dp;
>>   dp = g_object_ref(ip);
>>   return dp;
>> }
>>
>> $ gcc -Wall -Werror -c /tmp/test.c -o /tmp/test.o
>> /tmp/test.c: In function ?new_context?:
>> /tmp/test.c:19:13: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
>>    ctx->self = g_object_ref(om);
>>              ^
>> cc1: all warnings being treated as errors
>
> Thanks for the investigation!
>
>> So in order to fix the build of ModemManager it would be necessary to either
>> compile it without -Werror (with the risk of letting undesired assignments
>> happen) or fix all the occurrences of the offending assignments.
>
> If the patch to fix all the occurrences is small enough, we can do this
> in Buildroot, and submit upstream.
>
> If the patch is larger, then disabling -Werror is a better solution for
> us, and report the issue upstream (or contribute the fix).

I still wonder why the upstream MM doesn't have any compilation
issues. cflags also have -Werror:

cflags:                  -Wall -Werror -std=gnu89 -g -O2
-Wmissing-declarations -Wmissing-prototypes
-Wdeclaration-after-statement -Wno-unused-parameter -Wno-sign-compare
-Wno-deprecated-declarations -Wno-unused-but-set-variable
-Wformat-security

And the code is also the same (src/mm-base-manager.c):

typedef struct {
    MMBaseManager *self;
    GDBusMethodInvocation *invocation;
    gchar *level;
} SetLoggingContext;

static gboolean
handle_set_logging (MmGdbusOrgFreedesktopModemManager1 *manager,
                    GDBusMethodInvocation *invocation,
                    const gchar *level)
{
    SetLoggingContext *ctx;

    ctx = g_new0 (SetLoggingContext, 1);
    ctx->self = g_object_ref (manager);
    ctx->invocation = g_object_ref (invocation);
    ctx->level = g_strdup (level);

    mm_auth_provider_authorize (ctx->self->priv->authp,
                                invocation,
                                MM_AUTHORIZATION_MANAGER_CONTROL,
                                ctx->self->priv->authp_cancellable,
                                (GAsyncReadyCallback)set_logging_auth_ready,
                                ctx);
    return TRUE;
}

@Aleksander: any ETA for 1.8.0?

Yegor

[Buildroot] [PATCH] modem-manager: remove -Werror from CFLAGS

[Carlos Santos]

We are aproaching the 2018.05 release and modem-manager is still broken
due to warnings like this:

  mm-base-manager.c: In function 'handle_set_logging':
  mm-base-manager.c:680:15: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
       ctx->self = g_object_ref (manager);
                 ^

There is a macro defined in build/libglib2-2.56.1/gobject/gobject.h
which leads to the assignment errors:

  511 /* Make reference APIs type safe with macros */
  512 #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))

The problem can be easily reproduced with this sample code:

  $ cat test.c
  extern void *g_object_ref(void *);
  #define g_object_ref(Obj) ((__typeof__(Obj)) (g_object_ref) (Obj))
  extern double *new_double(int *);
  double *new_double(int *ip) {
    double *dp;
    dp = g_object_ref(ip);
    return dp;
  }

  $ gcc -Wall -Werror -c /tmp/test.c -o /tmp/test.o
  /tmp/test.c: In function ?new_context?:
  /tmp/test.c:19:13: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
     ctx->self = g_object_ref(om);
               ^
  cc1: all warnings being treated as errors

Fixing the code would require either changing the 120 ofending calls to
g_object_ref or a refactoring to make all types assignment compatible.
Let's take a simpler approach, disabling -Werror, and wait for the next
release of ModemManager.

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
---
 package/modem-manager/modem-manager.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/package/modem-manager/modem-manager.mk b/package/modem-manager/modem-manager.mk
index 100c4a2941..ba4711b6c2 100644
--- a/package/modem-manager/modem-manager.mk
+++ b/package/modem-manager/modem-manager.mk
@@ -19,6 +19,12 @@ else
 MODEM_MANAGER_CONF_OPTS += --without-qmi
 endif
 
+define MODEM_MANAGER_REMOVE_WERROR
+	$(SED) 's: -Werror::' $(@D)/configure
+endef
+
+MODEM_MANAGER_POST_PATCH_HOOKS += MODEM_MANAGER_REMOVE_WERROR
+
 ifeq ($(BR2_PACKAGE_MODEM_MANAGER_LIBMBIM),y)
 MODEM_MANAGER_DEPENDENCIES += libmbim
 MODEM_MANAGER_CONF_OPTS += --with-mbim
-- 
2.17.0

[Buildroot] [PATCH] modem-manager: remove -Werror from CFLAGS

[Peter Korsgaard]

>>>>> "Carlos" == Carlos Santos <casantos@datacom.ind.br> writes:

 > We are aproaching the 2018.05 release and modem-manager is still broken
 > due to warnings like this:

 >   mm-base-manager.c: In function 'handle_set_logging':
 >   mm-base-manager.c:680:15: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
 ctx-> self = g_object_ref (manager);
 >                  ^

 > There is a macro defined in build/libglib2-2.56.1/gobject/gobject.h
 > which leads to the assignment errors:

 >   511 /* Make reference APIs type safe with macros */
 >   512 #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))

 > The problem can be easily reproduced with this sample code:

 >   $ cat test.c
 >   extern void *g_object_ref(void *);
 >   #define g_object_ref(Obj) ((__typeof__(Obj)) (g_object_ref) (Obj))
 >   extern double *new_double(int *);
 >   double *new_double(int *ip) {
 >     double *dp;
 >     dp = g_object_ref(ip);
 >     return dp;
 >   }

 >   $ gcc -Wall -Werror -c /tmp/test.c -o /tmp/test.o
 >   /tmp/test.c: In function ?new_context?:
 >   /tmp/test.c:19:13: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
 ctx-> self = g_object_ref(om);
 >                ^
 >   cc1: all warnings being treated as errors

 > Fixing the code would require either changing the 120 ofending calls to
 > g_object_ref or a refactoring to make all types assignment compatible.
 > Let's take a simpler approach, disabling -Werror, and wait for the next
 > release of ModemManager.

 > Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
 > ---
 >  package/modem-manager/modem-manager.mk | 6 ++++++
 >  1 file changed, 6 insertions(+)

 > diff --git a/package/modem-manager/modem-manager.mk b/package/modem-manager/modem-manager.mk
 > index 100c4a2941..ba4711b6c2 100644
 > --- a/package/modem-manager/modem-manager.mk
 > +++ b/package/modem-manager/modem-manager.mk
 > @@ -19,6 +19,12 @@ else
 >  MODEM_MANAGER_CONF_OPTS += --without-qmi
 >  endif
 
 > +define MODEM_MANAGER_REMOVE_WERROR
 > +	$(SED) 's: -Werror::' $(@D)/configure
 > +endef

-Werror seems to come from m4/compiler_warnings.m4:

AC_ARG_ENABLE(more-warnings,
        AS_HELP_STRING([--enable-more-warnings], [Maximum compiler warnings]),
        set_more_warnings="$enableval",set_more_warnings=yes)
AC_MSG_CHECKING(for more warnings, including -Werror)
if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
        AC_MSG_RESULT(yes)
        CFLAGS="-Wall -Werror -std=gnu89 $CFLAGS"

Wouldn't passing --disable-more-warnings work instead of hacking up
configure?

-- 
Bye, Peter Korsgaard

[Buildroot] [PATCH] modem-manager: remove -Werror from CFLAGS

[Carlos Santos]

> From: "Peter Korsgaard" <peter@korsgaard.com>
> To: "Carlos Santos" <casantos@datacom.ind.br>
> Cc: "buildroot" <buildroot@buildroot.org>, "Thomas Petazzoni" <thomas.petazzoni@free-electrons.com>, "Aleksander
> Morgado" <aleksander@aleksander.es>
> Sent: Monday, May 21, 2018 12:54:14 PM
> Subject: Re: [PATCH] modem-manager: remove -Werror from CFLAGS

>>>>>> "Carlos" == Carlos Santos <casantos@datacom.ind.br> writes:
> 
> > We are aproaching the 2018.05 release and modem-manager is still broken
> > due to warnings like this:
> 
> >   mm-base-manager.c: In function 'handle_set_logging':
> >   mm-base-manager.c:680:15: warning: assignment from incompatible pointer type
> >   [-Wincompatible-pointer-types]
> ctx-> self = g_object_ref (manager);
> >                  ^
> 
> > There is a macro defined in build/libglib2-2.56.1/gobject/gobject.h
> > which leads to the assignment errors:
> 
> >   511 /* Make reference APIs type safe with macros */
> >   512 #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))
> 
> > The problem can be easily reproduced with this sample code:
> 
> >   $ cat test.c
> >   extern void *g_object_ref(void *);
> >   #define g_object_ref(Obj) ((__typeof__(Obj)) (g_object_ref) (Obj))
> >   extern double *new_double(int *);
> >   double *new_double(int *ip) {
> >     double *dp;
> >     dp = g_object_ref(ip);
> >     return dp;
> >   }
> 
> >   $ gcc -Wall -Werror -c /tmp/test.c -o /tmp/test.o
> >   /tmp/test.c: In function ?new_context?:
> >   /tmp/test.c:19:13: error: assignment from incompatible pointer type
> >   [-Werror=incompatible-pointer-types]
> ctx-> self = g_object_ref(om);
> >                ^
> >   cc1: all warnings being treated as errors
> 
> > Fixing the code would require either changing the 120 ofending calls to
> > g_object_ref or a refactoring to make all types assignment compatible.
> > Let's take a simpler approach, disabling -Werror, and wait for the next
> > release of ModemManager.
> 
> > Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
> > ---
> >  package/modem-manager/modem-manager.mk | 6 ++++++
> >  1 file changed, 6 insertions(+)
> 
> > diff --git a/package/modem-manager/modem-manager.mk
> > b/package/modem-manager/modem-manager.mk
> > index 100c4a2941..ba4711b6c2 100644
> > --- a/package/modem-manager/modem-manager.mk
> > +++ b/package/modem-manager/modem-manager.mk
> > @@ -19,6 +19,12 @@ else
> >  MODEM_MANAGER_CONF_OPTS += --without-qmi
> >  endif
> 
> > +define MODEM_MANAGER_REMOVE_WERROR
> > +	$(SED) 's: -Werror::' $(@D)/configure
> > +endef
> 
> -Werror seems to come from m4/compiler_warnings.m4:
> 
> AC_ARG_ENABLE(more-warnings,
>        AS_HELP_STRING([--enable-more-warnings], [Maximum compiler warnings]),
>        set_more_warnings="$enableval",set_more_warnings=yes)
> AC_MSG_CHECKING(for more warnings, including -Werror)
> if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
>        AC_MSG_RESULT(yes)
>        CFLAGS="-Wall -Werror -std=gnu89 $CFLAGS"
> 
> Wouldn't passing --disable-more-warnings work instead of hacking up
> configure?

Yes, if you don't forget the trailing "s" in --disable-more-warnings,
like I did in my first attempt. :-P

I will send an updated patch.

-- 
Carlos Santos (Casantos) - DATACOM, P&D
?Marched towards the enemy, spear upright, armed with the certainty
that only the ignorant can have.? ? Epitaph of a volunteer

[Buildroot] [PATCH] modem-manager: remove -Werror from CFLAGS

[Peter Korsgaard]

>>>>> "Carlos" == Carlos Santos <casantos@datacom.ind.br> writes:

>> Wouldn't passing --disable-more-warnings work instead of hacking up
 >> configure?

 > Yes, if you don't forget the trailing "s" in --disable-more-warnings,
 > like I did in my first attempt. :-P

heh ;)

 > I will send an updated patch.

Notice that I already sent such a patch with you in CC:

https://patchwork.ozlabs.org/patch/917852/

-- 
Bye, Peter Korsgaard

[Buildroot] [PATCH v2] modem-manager: remove -Werror from CFLAGS

[Carlos Santos]

We are aproaching the 2018.05 release and modem-manager is still broken
due to warnings like this:

  mm-base-manager.c: In function 'handle_set_logging':
  mm-base-manager.c:680:15: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
       ctx->self = g_object_ref (manager);
                 ^

There is a macro defined in build/libglib2-2.56.1/gobject/gobject.h
which leads to the assignment errors:

  511 /* Make reference APIs type safe with macros */
  512 #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))

The problem can be easily reproduced with this sample code:

  $ cat test.c
  extern void *g_object_ref(void *);
  #define g_object_ref(Obj) ((__typeof__(Obj)) (g_object_ref) (Obj))
  extern double *new_double(int *);
  double *new_double(int *ip) {
    double *dp;
    dp = g_object_ref(ip);
    return dp;
  }

  $ gcc -Wall -Werror -c /tmp/test.c -o /tmp/test.o
  /tmp/test.c: In function ?new_context?:
  /tmp/test.c:19:13: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
     ctx->self = g_object_ref(om);
               ^
  cc1: all warnings being treated as errors

Fixing the code would require either changing the 120 ofending calls to
g_object_ref or a refactoring to make all types assignment compatible.
Let's take a simpler approach, disabling extra warnings, and wait for
the next release of ModemManager.

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
---
 package/modem-manager/modem-manager.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/modem-manager/modem-manager.mk b/package/modem-manager/modem-manager.mk
index 100c4a2941..fe4a7a95da 100644
--- a/package/modem-manager/modem-manager.mk
+++ b/package/modem-manager/modem-manager.mk
@@ -11,6 +11,7 @@ MODEM_MANAGER_LICENSE = GPL-2.0+ (programs, plugins), LGPL-2.0+ (libmm-glib)
 MODEM_MANAGER_LICENSE_FILES = COPYING COPYING.LIB
 MODEM_MANAGER_DEPENDENCIES = host-pkgconf host-intltool libglib2 libgudev
 MODEM_MANAGER_INSTALL_STAGING = YES
+MODEM_MANAGER_CONF_OPTS = --disable-more-warnings
 
 ifeq ($(BR2_PACKAGE_MODEM_MANAGER_LIBQMI),y)
 MODEM_MANAGER_DEPENDENCIES += libqmi
-- 
2.17.0