Arduino IDE 1.8.2 : "Aggressively Cache Compiled Code" will cause compile error.

[bearwbearw]

When enabled the "aggressively cache compiled code" (new feature of 1.8.2, default is "On") in the preference menu, when open a new window by selecting a new example, will have compile error when compiling the code.

Error Code: arm-none-eabi-gcc: error: C:\Users\mtk00612\AppData\Local\Temp\arduino_build_72054/core/syscalls.c.o: No such file or directory

[pablosun]

This is because we explicitly links {build.path}/core/syscalls.c.o in our platform.txt file. This file does not exist when build caches are enabled in IDE v1.8.2.

The reason we need to link this file is because we need to make sure symbols required by C-Runtime won't be discarded as described in this thread.

If we link the syscalls.o into the core.lib file we will get following link errors:

c:/users/mtk03251/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/lib/armv7e-m/fpu\libc_s.a(lib_a-init.o): In function `__libc_init_array':

init.c:(.text.__libc_init_array+0x1c): undefined reference to `_init'

c:/users/mtk03251/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/lib/armv7e-m/fpu\libc_s.a(lib_a-sbrkr.o): In function `_sbrk_r':

sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk'

c:/users/mtk03251/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/lib/armv7e-m/fpu\libc_s.a(lib_a-writer.o): In function `_write_r':

writer.c:(.text._write_r+0x10): undefined reference to `_write'

c:/users/mtk03251/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/lib/armv7e-m/fpu\libc_s.a(lib_a-closer.o): In function `_close_r':

closer.c:(.text._close_r+0xc): undefined reference to `_close'

c:/users/mtk03251/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/lib/armv7e-m/fpu\libc_s.a(lib_a-fstatr.o): In function `_fstat_r':

fstatr.c:(.text._fstat_r+0xe): undefined reference to `_fstat'

c:/users/mtk03251/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/lib/armv7e-m/fpu\libc_s.a(lib_a-isattyr.o): In function `_isatty_r':

isattyr.c:(.text._isatty_r+0xc): undefined reference to `_isatty'

c:/users/mtk03251/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/lib/armv7e-m/fpu\libc_s.a(lib_a-lseekr.o): In function `_lseek_r':

lseekr.c:(.text._lseek_r+0x10): undefined reference to `_lseek'

c:/users/mtk03251/appdata/local/arduino15/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/../lib/gcc/arm-none-eabi/4.8.3/../../../../arm-none-eabi/lib/armv7e-m/fpu\libc_s.a(lib_a-readr.o): In function `_read_r':

readr.c:(.text._read_r+0x10): undefined reference to `_read'

collect2.exe: error: ld returned 1 exit status

[pablosun]

A solution is to move the syscalls.c file from core to variant. The variant won't get cached and archived into a .a file.

[ermias1981]

Dear pablosun the same problem happens when I tried to compile my library file developed with C and Arduino IDE 1.8.5 for Teensy 3.6 hardware. while I try to compile the same problem happens as below. whould you mind to tell the solution how can I fix this issues? As you proposed above I couldn't get syscalls.c file in core .

with kind regards.

c:/program files (x86)/arduino/hardware/tools/arm/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/lib/armv7e-m/fpu\libc.a(lib_a-sbrkr.o): In function `_sbrk_r':

sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk'

collect2.exe: error: ld returned 1 exit status