CodeWarrior for MCU中的主题 Re: CW 10.6 Kinetis - "incompatible implicit declaration" of all math.h functions?

CW 10.6 Kinetis - "incompatible implicit declaration" of all math.h functions?

dmarks_ls — Fri, 26 Sep 2014 15:47:49 GMT

I've run into this previously on an earlier project, but it was easy to patch over because there was exactly one math reference. This project is chock full of them, so I need to nip this in the bud.

Quite simply, it seems that #include <math.h> isn't doing any good, because the compiler isn't seeing any prototypes, and I'm getting a ton of messages like this:

../Sources/CalcLib/calcDenVisc.c: In function 'calcViscosity'

../Sources/CalcLib/calcDenVisc.c:81:9: warning: implicit declaration of function 'exp' [-Wimplicit-function-declaration]

../Sources/CalcLib/calcDenVisc.c: In function 'calcDensity':

../Sources/CalcLib/calcDenVisc.c:169:9: warning: implicit declaration of function 'pow' [-Wimplicit-function-declaration]

../Sources/CalcLib/calcDenVisc.c:176:9: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]

../Sources/CalcLib/calcDenVisc.c:200:19: warning: incompatible implicit declaration of built-in function 'pow' [enabled by default]

../Sources/CalcLib/calcFlow.c: In function 'calcFlow':

../Sources/CalcLib/calcFlow.c:59:9: warning: implicit declaration of function 'fabs' [-Wimplicit-function-declaration]

../Sources/CalcLib/calcFlow.c:155:7: warning: incompatible implicit declaration of built-in function 'fabs' [enabled by default]

../Sources/CalcLib/calcFlow.c: In function 'updateHiResTot':

../Sources/CalcLib/calcFlow.c:233:7: warning: incompatible implicit declaration of built-in function 'fabs' [enabled by default]

../Sources/CalcLib/calcSupport.c: In function 'calcHdlr_doCalcStep':

../Sources/CalcLib/calcSupport.c:249:17: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]

../Sources/CalcLib/calcSupport.c:258:17: warning: implicit declaration of function 'fabs' [-Wimplicit-function-declaration]

I'm running CW for MCU 10.6, with MQX v4.1.1 (had this issue with an MQX 4.0 project, too), compiling for a K20 120MHz target. This is the only system library that I seem to have issues with. Is there some special preprocessor define that I need to set in my project? (I have _EWL_C99=1 and __VFPV4__=1 defined in the preprocessor.)

Re: CW 10.6 Kinetis - "incompatible implicit declaration" of all math.h functions?

trytohelp — Fri, 03 Oct 2014 09:58:02 GMT

Hello David,

I will contact MQX colleague.

Keep you informed.

Have a great day,
Pascal Irrle

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Re: CW 10.6 Kinetis - "incompatible implicit declaration" of all math.h functions?

trytohelp — Fri, 03 Oct 2014 13:02:13 GMT

David,

I've performed some tests on my side with a Hello project wizard example based on MCU v10.6 + MQX V4.1.1.

The math.h as other libraries are defined in the EWL lib.

By default the MQX project is using/including the EWL library but the options below is not selected..

- this is the cause of the warning -

In fact if you include the #include <math.h>, the function fabs() for instance will not be resolved if the EWL is not enabled.

this option will add a command line instruction when the compiler is called: -specs=ewl_c_hosted.specs (in this configuration).

Now the math.h file will be really used to solve the math functions.

This is working for my example.

Have a great day,
Pascal Irrle