missing standard C library
I believe I'm having the same problem: when updating from 2.4.0 to 2.7.0.
I've tried reverting, deleting new install and re-installing 2.7.0 several times: Same result each time.
The messages resemble this:
c:\openstm32\systemworkbench\plugins\fr.ac6.mcu.externaltools.arm-none.win32_1.16.0.201807130628\tools\compiler\lib\gcc\arm-none-eabi\7.2.1\include\stdint.h:9:16: fatal error: stdint.h: No such file or directory
# include_next stdint.h
^~~~~~~~~~
compilation terminated.
(I couldn't get the above to show lt and gt signs around stdint.h...)
My recommendation to you would be try an older version if you can. It looks like the broken ARM toolchain was introduced in IDE v2.5.0. I haven't yet found why it's not broken for everyone else.