Re: passing flags to C compiler but not to C++ compiler

[Vincent Torri]

On Mon, Jul 29, 2013 at 5:17 PM, Robert Boehne <address@hidden> wrote:
> On 07/27/13 16:26, Vincent Torri wrote:
>>
>> On Sat, Jul 27, 2013 at 10:24 PM, Robert Boehne <address@hidden>
>> wrote:
>>>
>>>
>>> On 07/27/13 00:32, Vincent Torri wrote:
>>>>
>>>> hello
>>>>
>>>> in my sources, i have both C and C++ files. Something like
>>>>
>>>> my_lib_la_SOURCES = foo.c foo.cpp
>>>>
>>>> I want to pass, for example, -Wdeclaration-after-statement to gcc.
>>>> Hence,
>>>> when compiling foo.cpp, i have the warning :
>>>>
>>>> cc1plus.exe: warning: command line option
>>>> '-Wdeclaration-after-statement'
>>>> is valid for C/ObjC but not for C++
>>>>
>>>> How can I remove this warning when compiling c++ files ?
>>>>
>>>> thank you
>>>>
>>>> Vincent Torri
>>>
>>>
>>> I misread - for C and not C++ you should set "CFLAGS"
>>>
>>> ./configure CFLAGS="-g -O2 -Wdeclaration-after-statement" CXXFLAGS="-g
>>> -O2"
>>
>> it will still not work as $(CFLAGS) will be passed to the compilation
>> of the c++ source file
>>
>> Vincent Torri
>
>
> Are you saying you've tried it?

1) yes i tried it

2) the fact that I have the warning proves that CFLAGS is passed to
the C++ compiler...

Vincent Torri


>  That's not my understanding of how Automake
> (or GNU Make) works.  Unless the project has overridden the default
> use for these variables, that's how it's supposed to work, and
> this problem is an example of why.
>
> This is the relevant section of the manual:
>
> http://www.gnu.org/software/automake/manual/automake.html#Standard-Configuration-Variables
>
>