…tput The crash happens in clang::driver::tools::SplitDebugName when Output is InputInfo::Nothing. It doesn't happen with standalone clang driver because output is created in Driver::BuildJobsForActionNoCache. Example backtrace: ``` * thread #1, name = 'clangd', stop reason = hit program assert * frame #0: 0x00007ffff5c4eacf libc.so.6`raise + 271 frame #1: 0x00007ffff5c21ea5 libc.so.6`abort + 295 frame #2: 0x00007ffff5c21d79 libc.so.6`__assert_fail_base.cold.0 + 15 frame #3: 0x00007ffff5c47426 libc.so.6`__assert_fail + 70 frame #4: 0x000055555dc0923c clangd`clang::driver::InputInfo::getFilename(this=0x00007fffffff9398) const at InputInfo.h:84:5 frame #5: 0x000055555dcd0d8d clangd`clang::driver::tools::SplitDebugName(JA=0x000055555f6c6a50, Args=0x000055555f6d0b80, Input=0x00007fffffff9678, Output=0x00007fffffff9398) at CommonArgs.cpp:1275:40 frame #6: 0x000055555dc955a5 clangd`clang::driver::tools::Clang::ConstructJob(this=0x000055555f6c69d0, C=0x000055555f6c64a0, JA=0x000055555f6c6a50, Output=0x00007fffffff9398, Inputs=0x00007fffffff9668, Args=0x000055555f6d0b80, LinkingOutput=0x0000000000000000) const at Clang.cpp:5690:33 frame #7: 0x000055555dbf6b54 clangd`clang::driver::Driver::BuildJobsForActionNoCache(this=0x00007fffffffb5e0, C=0x000055555f6c64a0, A=0x000055555f6c6a50, TC=0x000055555f6c4be0, BoundArch=(Data = 0x0000000000000000, Length = 0), AtTopLevel=true, MultipleArchs=false, LinkingOutput=0x0000000000000000, CachedResults=size=1, TargetDeviceOffloadKind=OFK_None) const at Driver.cpp:5618:10 frame #8: 0x000055555dbf4ef0 clangd`clang::driver::Driver::BuildJobsForAction(this=0x00007fffffffb5e0, C=0x000055555f6c64a0, A=0x000055555f6c6a50, TC=0x000055555f6c4be0, BoundArch=(Data = 0x0000000000000000, Length = 0), AtTopLevel=true, MultipleArchs=false, LinkingOutput=0x0000000000000000, CachedResults=size=1, TargetDeviceOffloadKind=OFK_None) const at Driver.cpp:5306:26 frame #9: 0x000055555dbeb590 clangd`clang::driver::Driver::BuildJobs(this=0x00007fffffffb5e0, C=0x000055555f6c64a0) const at Driver.cpp:4844:5 frame #10: 0x000055555dbe6b0f clangd`clang::driver::Driver::BuildCompilation(this=0x00007fffffffb5e0, ArgList=ArrayRef<const char *> @ 0x00007fffffffb268) at Driver.cpp:1496:3 frame #11: 0x000055555b0cc0d9 clangd`clang::createInvocation(ArgList=ArrayRef<const char *> @ 0x00007fffffffbb38, Opts=CreateInvocationOptions @ 0x00007fffffffbb90) at CreateInvocationFromCommandLine.cpp:53:52 frame #12: 0x000055555b378e7b clangd`clang::clangd::buildCompilerInvocation(Inputs=0x00007fffffffca58, D=0x00007fffffffc158, CC1Args=size=0) at Compiler.cpp:116:44 frame #13: 0x000055555895a6c8 clangd`clang::clangd::(anonymous namespace)::Checker::buildInvocation(this=0x00007fffffffc760, TFS=0x00007fffffffe570, Contents= Has Value=false ) at Check.cpp:212:9 frame #14: 0x0000555558959cec clangd`clang::clangd::check(File=(Data = "build/test.cpp", Length = 64), TFS=0x00007fffffffe570, Opts=0x00007fffffffe600) at Check.cpp:486:34 frame #15: 0x000055555892164a clangd`main(argc=4, argv=0x00007fffffffecd8) at ClangdMain.cpp:993:12 frame #16: 0x00007ffff5c3ad85 libc.so.6`__libc_start_main + 229 frame #17: 0x00005555585bbe9e clangd`_start + 46 ``` Test Plan: ninja ClangDriverTests && tools/clang/unittests/Driver/ClangDriverTests Differential Revision: https://reviews.llvm.org/D154602

warnings in uninstantiated templates #14

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