Code size regression when using localtime

[Sebi]

I noticed a huge code size regression in newer ARM GCC versions when using the localtime function. The regression first occurred with 4.9 2015q2. I've attached sample code which I compiled using "arm-none-eabi-gcc test.c -O3 --specs=nano.specs -o test.elf". I get the following object sizes:

4.9 2015q1:
   text data bss dec hex filename
   4076 188 48 4312 10d8 test.elf

4.9 2015q2:
   text data bss dec hex filename
  13408 196 80 13684 3574 test.elf

Looking at the assembly I belive the size increase is due to a new call to _tzset_unlocked which then drags in a whole lot of other functions.

[Thomas Preud'homme (thomas-preudhomme)]

Hi Sebi,

This is due to commit to better support changing the TZ environment variable. See my last comment on [1] for a workaround.

[1] https://answers.launchpad.net/gcc-arm-embedded/+question/269029

Best regards.