https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59394
--- Comment #6 from smalcom <smal.root at gmail dot com> --- Created attachment 52050 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52050&action=edit Generated assembly when using "LTO". avr-gcc-10.2 (In reply to Andrew Pinski from comment #4) > If I use -Wl,--gc-sections -ffunction-sections, then all of the unused > (non-static) functions are removed. > > Also -flto is able to optimize it too. I confirm that: 1. With set "-Wl,--gc-sections -ffunction-sections" output file do not contain unused functions (attached gcsec.lss). 2. With "-flto" all functions are inlined and present only used code (attached lto.lss). Tested using gcc-10: avr-gcc -v Using built-in specs. Reading specs from /mnt/stor5/opt/сборка/avr-10.2.0/bin/../lib/gcc/avr/10.2.0/device-specs/specs-avr2 COLLECT_GCC=avr-gcc COLLECT_LTO_WRAPPER=/mnt/stor5/opt/сборка/avr-10.2.0/bin/../libexec/gcc/avr/10.2.0/lto-wrapper Target: avr Configured with: ../configure --prefix=/opt/toolchain/avr-10.2.0 --target=avr --enable-languages=c,c++ --disable-nls --disable-libssp --with-dwarf2 Thread model: single Supported LTO compression algorithms: zlib zstd gcc version 10.2.0 (GCC) Great. Thanks!
