illegal pragma opt_branchtailmerge

[NeraPhil]

When building the MQX libraries (CodeWarrior 10.2, MQX 3.8, Windows 7) I get tons of warnings about "#pragma opt_branchtailmerge off" being an illegal pragma. Where is __CWBUILD__ defined? Is this missing in my installation?

[petr_uhlir]

NeraPhil,

In CW 10.1 compiler4.3.3  version there was a bug which requested to turn off branchtailmerge optimization. Its fixed in CW 10.2 so you can remove the following check in mqx.h

#if defined(__CWBUILD__)

/* This section switches off the branchtailmerge optimization which is not
implemented correctly in the CodeWarrior C/C++ Compiler version 4.3.3
(known issue) */
#if (__CWBUILD__ >= 38) && (__CWBUILD__ <= 50)
#pragma opt_branchtailmerge off
#endif
/* CW 10.1 compilation issue - switch off peephole optimization */
#if (__CWBUILD__ == 3009)
#pragma peephole off
#pragma no_register_coloring on
#endif

PetrU

[dmarks_ls]

---

r51423 wrote:

NeraPhil,

In CW 10.1 compiler4.3.3  version there was a bug which requested to turn off branchtailmerge optimization. Its fixed in CW 10.2 so you can remove the following check in mqx.h

#if defined(__CWBUILD__)

/* This section switches off the branchtailmerge optimization which is not
implemented correctly in the CodeWarrior C/C++ Compiler version 4.3.3
(known issue) */
#if (__CWBUILD__ >= 38) && (__CWBUILD__ <= 50)

[snip]

---

I currently have MCU v10.1 and v10.2 installed.  I'm starting a new project and will be using 10.2 for that, but I have at least one existing project which to date I've been using v10.1 to compile.  Simply removing this check in mqx.h would potentially bork any build I attempt in the older 10.1.

Is there a way in the preprocessor to distinguish whether I'm using CW for MCU 10.2 vs. 10.1?  Thanks.

[NeraPhil]

PetrU,

If I understand you right this is a "bug" in the MQX 3.8 source code? Will this be corrected with MQX 3.9 - or will there be a MQX 3.8.x version?

NeraPhil