https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88550
--- Comment #3 from Harry Wong <harrywong at live dot com> --- Thanks for your help! After using the '-fdump-ipa-cgraph --save-temps' option I had thousands of files generated and don't know how to analysis them... Could you help me with this? And I also got the .cgraph file, it too large(more than 141MB), and I've found these lines in the end of file: Total unit size: 308429, partition size: 10000 Step 0: added _GLOBAL__I_65535_0_main.cpp.o/1191204, size 1755, cost 9206/779 best 9206/779, step 0 Step 1: added uninitialized_move_alloc.constprop/1191183, size 1799, cost 9553/779 best 9553/779, step 1 Step 2: added throw_length_error.constprop/1191181, size 1815, cost 9628/779 best 9628/779, step 2 Step 3: added operator().constprop/1191180, size 1840, cost 11089/779 best 11089/779, step 3 Step 4: added _M_construct.constprop/1191177, size 1886, cost 342715/779 best 342715/779, step 4 Step 5: added __ct_base .constprop/1191176, size 1912, cost 794034/2171 best 794034/2171, step 5 .... Step 1145: added __dt_comp /490360, size 7271, cost 228255/656661 best 228255/656661, step 1145