vivanishin
commented
4 years ago This is because clang does not record compile switches in DW_AT_producer by default. For new versions of clang such as yours, supplying -g -grecord-gcc-switches should do the trick (here's a patch introducing the necessary machinery in clang: https://reviews.llvm.org/D30760).
./flagsup.py --full /dev/shm/jsc_lto_wl Canonical compile string (270 compile units): Ubuntu clang version 11.0.0-++20200715081714+92f7bd3a399-1~exp1~20200715062327.261 compile dirs (units): /home/adrian/Downloads/webkit-master/aflclangfast/Release (269) /home/adrian/Downloads/webkit-master/aflclangfast/Release/../../Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp /home/adrian/Downloads/webkit-master/aflclangfast/Release/../../Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp /home/adrian/Downloads/webkit-master/aflclangfast/Release/../../Source/JavaScriptCore/disassembler/udis86/udis86.c /home/adrian/Downloads/webkit-master/aflclangfast/Release/../../Source/JavaScriptCore/disassembler/udis86/udis86_decode.c /home/adrian/Downloads/webkit-master/aflclangfast/Release/../../Source/JavaScriptCore/disassembler/udis86/udis86_itab_holder.c /home/adrian/Downloads/webkit-master/aflclangfast/Release/../../Source/JavaScriptCore/disassembler/udis86/udis86_syn-att.c 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Diff for flag set 2 (1 compile units): --- Ubuntu clang version 11.0.0-++20200715081714+92f7bd3a399-1~exp1~20200715062327.261 +++ Ubuntu clang version 11.0.0-++20200714081735+74c14202d90-1~exp1~20200714062355.260 delta: