In version 2.5.1 of the Acconeer libraries for Cortex-M0 we have started using LTO.

Unfortunately, GCC does not recognize Windows and Linux versions of the GCC compiler as the same compiler and does not allow our libraries to use LTO on Windows:

make -j8 all
arm-none-eabi-gcc -o "my_example.elf" @"objects.list" -lacconeer -mcpu=cortex-m0plus -T"C:\Users\Me\STM32CubeIDE\workspace_1.4.0\my_example\STM32G071CBTX_FLASH.ld" --specs=nosys.specs -Wl,-Map="my_example.map" -Wl,--gc-sections -static -L"C:\Users\Me\STM32CubeIDE\workspace_1.4.0\my_example\rss\lib" --specs=nano.specs -mfloat-abi=soft -mthumb -Wl,--start-group -lc -lm -Wl,--end-group
lto1.exe: internal compiler error: bytecode stream: expected tag round_div_expr instead of reference_type
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
lto-wrapper.exe: fatal error: arm-none-eabi-gcc returned 1 exit status
compilation terminated.
d:\program\stm32cubeide_1.4.0\stm32cubeide\plugins\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.7-2018-q2-update.win32_1.4.0.202007081208\tools\arm-none-eabi\bin\ld.exe: error: lto-wrapper failed
collect2.exe: error: ld returned 1 exit status
make: *** [makefile:50: my_example.elf] Error 1
"make -j8 all" terminated with exit code 2. Build might be incomplete.
 
10:46:01 Build Failed. 2 errors, 0 warnings. (took 941ms)

Resolve by:
LTO can be disabled by going into "Project -> Properties -> C/C++ Build -> Settings -> MCU GCC Linker -> Miscellaneous", then under "Other flags" add the flag "-fno-lto".