Worth to mention is that -ffunction-sections -fdata-sections were good in times where LTO was not available.
wt., 24 wrz 2019, 23:49 użytkownik Tomasz Gajc <tpg...@gmail.com> napisał: > Hi, > > our linkers (ld.bfd, ld.lld) by default uses ICF and gc-sections > > > https://github.com/OpenMandrivaAssociation/llvm/blob/3e06cf7671e8abed54b1f48c9689810d3cbf59f3/lld-default-settings.patch#L32 > > > https://github.com/OpenMandrivaAssociation/llvm/blob/3e06cf7671e8abed54b1f48c9689810d3cbf59f3/lld-default-settings.patch#L61 > > 1. gc-sections > This works only when -ffunction-sections is passed during compilation, and > its GCC specific. > Makes no sense to enable LD --gc-sections when our default %optflags does > not emit -ffunction-sections -fdata-sections > > 2. ICF > Same as above, without -ffunction-sections -fdata-sections in optflags it > make no sense > > 3. Unsafe ? > We are the only ones who enabled ICF and gc-section in gold and LLD. I > really wonder if these uncommon options gives any advantage these days. > > WDYT ? >
