I remember that Og has been added to clang in 4.0 offering a potential better experience than O1, see: https://github.com/llvm-mirror/clang/commit/14bfc9e99e6e6903b09480a22c153032be77ae4e
You could also try using O1, since the difference between O0 should be: opt adds: -globalopt -demanded-bits -branch-prob -inferattrs -ipsccp -dse -loop-simplify -scoped-noalias -barrier -adce -deadargelim -memdep -licm -globals-aa -rpo-functionattrs -basiccg -loop-idiom -forceattrs -mem2reg -simplifycfg -early-cse -instcombine -sccp -loop-unswitch -loop-vectorize -tailcallelim -functionattrs -loop-accesses -memcpyopt -loop-deletion -reassociate -strip-dead-prototypes -loops -basicaa -correlated-propagation -lcssa -domtree -always-inline -aa -block-freq -float2int -lower-expect -sroa -loop-unroll -alignment-from-assumptions -lazy-value-info -prune-eh -jump-threading -loop-rotate -indvars -bdce -scalar-evolution -tbaa -assumption-cache-tracker clang adds : -momit-leaf-frame-pointer clang drops : -mdisable-fp-elim -mrelax-all Hope this helps! > On 8 Dec 2017, at 08:53, [email protected] wrote: > > I'm looking for a good default setup for building a debug Firefox using clang > (5.0) that is at the same time usable. > > With GCC I hit a good sweet spot with: > > ``` > mk_add_options "export RUSTC_WRAPPER=sccache" > mk_add_options 'export CARGO_INCREMENTAL=1' > > ac_add_options --with-ccache > > ac_add_options --enable-optimize="-g -Og" > ac_add_options --enable-debug-symbols > ac_add_options --enable-debug > ``` > > but the same settings when I add: > > ``` > export CC="clang" > export CXX="clang++" > ``` > > give me a much, much slower build that feels very slow to start and UI is > very noticeably slower. > > Any recommendations? > > Thanks, > zb. > _______________________________________________ > dev-platform mailing list > [email protected] > https://lists.mozilla.org/listinfo/dev-platform _______________________________________________ dev-platform mailing list [email protected] https://lists.mozilla.org/listinfo/dev-platform
