Re: [cmake-developers] -isystem suppresses warnings from user header

[Tamás Kenéz]

Thanks! I missed that property.
Tamas

On Thu, Apr 7, 2016 at 4:13 PM, Brad King  wrote:

> On 04/07/2016 10:03 AM, Tamás Kenéz wrote:
> > CMake uses "-isystem" on the compiler command line for the
> > INTERFACE_INCLUDE_DIRECTORIES of imported libraries.
> >
> > Question: is this the intended behaviour?
>
> Yes.  See discussion here:
>
> * http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/7533
>
> and implementation here:
>
> * Always consider includes from IMPORTED targets to be SYSTEM.
>   https://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=a63fcbcb
>
> > Can I force the -I flag somehow for my library?
>
> Look at these:
>
> *
> https://cmake.org/cmake/help/v3.5/variable/CMAKE_NO_SYSTEM_FROM_IMPORTED.html
> * https://cmake.org/cmake/help/v3.5/prop_tgt/NO_SYSTEM_FROM_IMPORTED.html
>
> -Brad
>
>
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Re: [cmake-developers] -isystem suppresses warnings from user header

[Brad King]

On 04/07/2016 10:03 AM, Tamás Kenéz wrote:
> CMake uses "-isystem" on the compiler command line for the
> INTERFACE_INCLUDE_DIRECTORIES of imported libraries.
> 
> Question: is this the intended behaviour?

Yes.  See discussion here:

* http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/7533

and implementation here:

* Always consider includes from IMPORTED targets to be SYSTEM.
  https://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=a63fcbcb

> Can I force the -I flag somehow for my library?

Look at these:

* https://cmake.org/cmake/help/v3.5/variable/CMAKE_NO_SYSTEM_FROM_IMPORTED.html
* https://cmake.org/cmake/help/v3.5/prop_tgt/NO_SYSTEM_FROM_IMPORTED.html

-Brad

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[cmake-developers] -isystem suppresses warnings from user header

[Tamás Kenéz]

Environment: CMake 3.5, linux, g++

CMake uses "-isystem" on the compiler command line for the
INTERFACE_INCLUDE_DIRECTORIES of imported libraries.

Unfortunately including a header via an isystem path suppresses warnings
emitted from the header, such as warnings caused by expansions of macros
defined in that header.

Example: I have a printf-like LOG(...) macro which expands to a function
marked as printf-like. The -Wformat warnings are suppressed if the
containing log.h is found on isystem path.

Question: is this the intended behaviour? Can I force the -I flag somehow
for my library? (I'm aware of CMAKE_INCLUDE_SYSTEM_FLAG_CXX but I don't
want to modify all the client projects that uses my library.)

Or is it bug?

Thanks,
Tamas
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