On Wed, 12 Nov 2025 15:46:09 GMT, Matthias Baesken <[email protected]> wrote:
>> Identical code folding can reduce the size of some libs, especially libjvm. >> However not all linkers support the flag/feature so we have to limit it to >> some environments. >> See for example this manpage : >> https://manpages.debian.org/testing/lld-7/ld.lld-7.1 >> >> >> sizes of libjvm.so with / without -icf=all >> linux aarch64 : 25888 / 27112 K >> linux x86_64 : 27952 / 29072 K >> >> >> (for most other native libs the identical code folding has no effect, >> because there is nothing to fold) > > Matthias Baesken has updated the pull request incrementally with one > additional commit since the last revision: > > Limit icf to release builds Something similar seems to be used already for MSVC https://github.com/openjdk/jdk/blob/56a27d11971d935e8b28ac9d701cf9890014a949/make/autoconf/flags-ldflags.m4#L89 `BASIC_LDFLAGS_JVM_ONLY="-opt:icf,8 -subsystem:windows"` See the icf doc at https://learn.microsoft.com/en-us/cpp/build/reference/opt-optimizations?view=msvc-170 ------------- PR Comment: https://git.openjdk.org/jdk/pull/28236#issuecomment-3522621671
