Porting old C project (LPC1788) to MCUXpresso (Redlib) compiler fails to locate “wmemcmp” function

[Eugene723]

Compiler can’t find “wchar.h” and “wctype.h” includes that don’t exist in “C:\NXP\MCUXpressoIDE_11.8.0_1165\ide\plugins\com.nxp.mcuxpresso.tools.win32_11.8.0.202306131047\tools\redlib\include” folder – the one where all other library headers are located.

These two header files do exist in “C:\NXP\MCUXpressoIDE_11.8.0_1165\ide\plugins\com.nxp.mcuxpresso.tools.win32_11.8.0.202306131047\tools\arm-none-eabi\include” folder though.

So, what is the difference between these two folders with header files and where in project settings do I specify which one to use? Can I use the latter when compiling for LPC1788 with Redlib?

Thank you,

Eugene

[Alice_Yang]

Hello @Eugene723 

"Can I use the latter when compiling for LPC1788 with Redlib?"

->>Which lib does your old project used?

You can also send your project to me, I help to check on my side.

BR

Alice

[Eugene723]

Hi Alice,

The old project used expensive commercial toolchain, so we decided to port it to MCUXpresso.

Some .c files from old project contain the following statements:

#include <wctype.h>

#include <wchar.h>

so compiler errors:

fatal error: wctype.h: No such file or directory

although there are those files, but in different folder. Function "wmemcmp" is used in this way:

int diff = wmemcmp(a, b, a_count);

where "a" and "b" declared as "wchar_t *".

Declaration "wchar_t" comes from header "stdlib.h" located in "C:\NXP\MCUXpressoIDE_11.8.0_1165\ide\plugins\com.nxp.mcuxpresso.tools.win32_11.8.0.202306131047\tools\redlib\include" folder, but neither "wctype.h" nor "wchar.h" reside in that folder. Why?

Thank you,

Eugene

[ErichStyger · Accepted solution]

Hi @Eugene723 ,

Redlib does not support wide characters, you have to select a library which supports it, for example newlib:

I wrote about different library options here: https://mcuoneclipse.com/2023/01/28/which-embedded-gcc-standard-library-newlib-newlib-nano/

I hope this helps,

Erich