Feisikar I. mx6 cross-compilation tool chain BUG, I. mx6 compilation tool

Feisikar I. mx6 cross-compilation tool chain BUG, I. mx6 compilation tool

Recently, I made a project on the I. mx6 platform of Apsara stack. After coding and testing on I. mx6, I found that the return value of a function has been incorrect,

The Return Value Type of a function is "char". The returned value is '-2', And the return value is equal to the value of '0'.

It is found that the program cannot enter the wrong branch, and the problem is found only after repeated tests, because the system treats it as 254 when '-2' is returned.

Then I added a signed modifier to the front of the char to return '-2' correctly.

That is to say, the compiler tool of I. mx6 sets the 'Char 'type to 'unsigned char' by default, which is different from the default 'signed char' type of other compilers.

This is not a big bug. Record it to prevent further errors.