On Tue, 13 Apr 2021 at 14:12, Rebecca Cran <rebe...@nuviainc.com> wrote: > > +Ard (with the correct email address) > > On 4/13/21 4:32 AM, Laszlo Ersek wrote: > > +Liming > > > > On 04/12/21 17:10, Rebecca Cran wrote: > >> I noticed the GCC49 (and GCC48) AARCH64 and ARM DEBUG builds use -O0, > >> unlike IA32 and X64 platforms which build with -Os. > >> > >> e.g. from > >> https://github.com/tianocore/edk2/blob/master/BaseTools/Conf/tools_def.template > >> : > >> > >> DEBUG_GCC49_AARCH64_CC_FLAGS = DEF(GCC49_AARCH64_CC_FLAGS) -O0 > >> > >> Is that deliberate, or should it be like X64 where DEBUG builds are > >> optimized and NOOPT is used when unoptimized binaries are needed? > >> > > > > Seems to go back to commit dafe0fedc508 ("BaseTools: Add GCC49 > > toolchain; align data sections to 0x40", 2014-07-28). My guess is that > > in 2014, gcc (4.9) may have had issues with arm64 code generation with -Os. > > > > You hint at DEBUG_GCC48_AARCH64_CC_FLAGS too, which seems like a > > promising clue at first -- because, perhaps the GCC49 flags in the > > above-mentioned commit had simply been modeled on the then-existent > > GCC48 ones. > > > > Unfortunately however, the GCC48 entry appeared in the > > less-than-helpfully-explained commit 2bc3256ca6d4 ("Sync BaseTool trunk > > (version r2640) into EDKII BaseTools.", 2014-01-10). > > > > Thanks > > Laszlo > > >
IIRC we only added NOOPT for ARM much later, and at that time, we decided to leave GCC49 alone. -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#74054): https://edk2.groups.io/g/devel/message/74054 Mute This Topic: https://groups.io/mt/82040511/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
