strcat function is not working with framework = ch32v003fun.

[RhonyD]

strcat function is not working with framework = ch32v003fun in VS code.
message from compiler
/.platformio/packages/toolchain-riscv/bin/../lib/gcc/riscv-none-embed/8.2.0/../../../../riscv-none-embed/bin/ld: /tmp/ccXXAkkp.ltrans0.ltrans.o: in function .L244': <artificial>:(.text.startup.main+0x378): undefined reference to strcat'
what to do please suggest.

[maxgerhardt]

The ch32v003fun framework is all about being as small as possible. It deliberately disables the inclusion of the compiler-provided standard C library (by using the -nostdlib compiler and linker flag) in order to be able to implement all standard C functions that it needs itself. See e.g.

https://github.com/cnlohr/ch32v003fun/blob/1ea96b14248628a209816963821b088dc8ecf506/ch32v003fun/ch32v003fun.c#L216-L221

strcat() is not implemented there. So, this is not strictly a bug. If you think it should be provided there, file a ticket in https://github.com/cnlohr/ch32v003fun.

You can also create the function yourself, as illustrated by e.g. the musl C library

char *strcat(char *restrict dest, const char *restrict src)
{
	strcpy(dest + strlen(dest), src);
	return dest;
}

Of course, you can also deviate from the clean, holy path and re-enable the inclusion of the compiler-provided C library, by adding

build_unflags = -nostdlib

into the platformio.ini.

[RhonyD]

Thanks for your reply. I have implemented my own strcat function and it worked nicely. And there is no point of deviating from the clean, holy path of ch32v003fun framework and I am developing all my libraries based upon the same framework. it was just out of curiosity but anyways thanks again for your help and reply.