Circuit Playground Express build fails with strncpy error using developer.arm.com compiler

[siehputz]

Building master with the compiler from developer.arm.com I see:

CC ../../lib/tinyusb/src/class/msc/msc_device.c
../../lib/tinyusb/src/class/msc/msc_device.c: In function 'proc_builtin_scsi':
../../lib/tinyusb/src/class/msc/msc_device.c:273:7: error: 'strncpy' output truncated before terminating nul copying 8 bytes from a string of the same length [-Werror=stringop-truncation]
strncpy((char*) inquiry_rsp.vendor_id , CFG_TUD_MSC_VENDOR , sizeof(inquiry_rsp.vendor_id));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../lib/tinyusb/src/class/msc/msc_device.c:274:7: error: 'strncpy' output truncated before terminating nul copying 16 bytes from a string of the same length -Werror=stringop-truncation]
strncpy((char*) inquiry_rsp.product_id , CFG_TUD_MSC_PRODUCT , sizeof(inquiry_rsp.product_id));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [build-circuitplayground_express/lib/tinyusb/src/class/msc/msc_device.o] Error 1

Apparently being caused by the following defines in
build-circuitplayground_express/genhdr/autogen_usb_descriptor.h

// Vendor name included in Inquiry response, max 8 bytes
#define CFG_TUD_MSC_VENDOR "Adafruit"

// Product name included in Inquiry response, max 16 bytes
#define CFG_TUD_MSC_PRODUCT "CircuitPlaygroun"

[dhalbert]

This is an issue in the tinyusb library; I filed an issue there a few days ago: hathach/tinyusb#33. For now just use the 7-2018-q2 release of the arm gcc toolchain.