"Change the default build type to MinSizeRel." broke zephyr/qemu_x86 build #1526
Description
#1513 merged as ff8ff98 leads to:
$ make -f ./targets/zephyr/Makefile.zephyr BOARD=qemu_x86
...
/home/pfalcon/opt/zephyr-sdk-0.8.2/sysroots/i686-pokysdk-linux/usr/libexec/i586-poky-elf/gcc/i586-poky-elf/5.2.0/real-ld: zephyr_prebuilt.elf section `bss' will not fit in region `RAM'
/home/pfalcon/opt/zephyr-sdk-0.8.2/sysroots/i686-pokysdk-linux/usr/libexec/i586-poky-elf/gcc/i586-poky-elf/5.2.0/real-ld: region `RAM' overflowed by 19396 bytes
collect2: error: ld returned 1 exit status
The size quoted, 19396, is, based on the Zephyr linker map file, is the full size of "bss" section, i.e. the message kind of tells that full and exact BSS is what doesn't fit RAM, which is otherwise 192K. Surprisingly, this issue doesn't affect qemu_cortex_m3 build (RAM 64K). Based on that, it looks like a weird incompatibility with Zephyr SDK x86 toolchain or something. The issue occurs with both Zephyr 1.6.0 and master, SDK used is 0.8.2 (latest).