Hello,
I just stumbled on a problem with the make clean command in U-Boot. When executing make clean I noticed that some programmes that should have been deleted were not deleted. These were the programmes to be deleted with instructions such as:
@rm -f $(obj)tools/env/{fw_printenv,fw_setenv}
The reason is (after scratching my head for a few hours) that on my platform BASH is not the default shell. I am using Ubuntu and /bin/sh is linked to dash (see https://wiki.ubuntu.com/DashAsBinSh for details). As I am not an expert on shells, my guess is that the above construct is a "bashism" and not compliant to /bin/sh.
There are two trivial solutions to this problem:
(a) Add a line SHELL=/bin/bash somewhere in top level Makefile (b) Write out each individual file's path name separately in the @rm command line.
What is best course of action? Choosing (a) means that we are specifying BASH as a requirement for the U-Boot HOST environment. If this is already the case then solution (a) is perhaps the best and limits U-Boot regression testing to one shell type. Otherwise if we want to be compatible with /bin/sh then I believe solution (b) is preferable.
Regards, Eugene O'Brien