in an os-less small program (bootloader) using the os-less OSAL for the HAL, I wanted to use chprintf() at least during development. However, chprintf() has a very small (macro) dependency on chSequentialStreamPut. This means the build fails with this compiler error:
Code: Select all
In function `chvprintf':
os/hal/lib/streams/chprintf.c:148: undefined reference to `chSequentialStreamPut'
hal_streams.h pretty much defines the same BaseSequentialStream as chstreams.h does, but the method macro's are different. (Why?)
Anyway, I have found two ways to solve the compiler error. Nothing spectacular, a bit of a hack for now, but it may help others, or drive development.
1) Adapt Makefile to always define chSequentialStreamPut as streamPut
Code: Select all
##############################################################################
# Start of user section
#
# List all user C define here, like -D_DEBUG=1
UDEFS = -DchSequentialStreamPut=streamPut
This approach does not modify the ChibiOS source code, but the define is now always set which may lead to unintended behaviour elsewhere (not investigated!).
2) Or, you can *alternatively* add the define conditionally in the top of chprintf.c. This however modifies the ChibiOS source code.
Code: Select all
/* Either one of these get defined depending on whether using HAL alone or with RTOS:
* os/hal/include/hal_streams.h:139:#define streamPut(ip, b) ((ip)->vmt->put(ip, b))
* os/rt/include/chstreams.h:127:#define chSequentialStreamPut(ip, b) ((ip)->vmt->put(ip, b))
*
*/
#ifndef chSequentialStreamPut
#define chSequentialStreamPut streamPut
#endif
There might be other ways, and/or a cleaner solution.
Is there a way to define CFLAGS on a per-source-file basis, like the Linux kernel does?
Regards,
Leon
