8 years, 2 months ago.  This question has been closed. Reason: Off Topic

Set -funsigned-char flag when exporting to GCC

Here's a minor feature request for exporting to GCC and GCC-based environments (such as KDS and Atmel Studio): add the compiler flag -funsigned-char in exported projects by default.

The mbed handbook lists the char type as being unsigned (here), but the C standard does not specify, and in GCC chars are signed by default (see http://stackoverflow.com/a/2054959/1858923). This leads to errors when exporting projects that assume that chars are unsigned, such as Neil Thiessen's SDFileSystem. If we automatically set -funsigned-char in exported projects, we reduce the inconsistencies between the mbed online compiler and other target compilers for exported projects.

PS: I tried posting this as a "discussion," but it generated a 404 error.