ld.lld asserts for empty archive w/hexagonelf

[androm3da]

When I try to run the linux kernel build, in some configurations it fails like so:

$ llvm-ar rcsD foo.a
$ ./bin/ld.lld -m hexagonelf foo.a -o out
ld.lld: /home/brian/src/toolchain_for_hexagon/llvm-project/lld/ELF/Arch/Hexagon.cpp:63: virtual uint32_t (anonymous namespace)::Hexagon::calcEFlags() const: Assertion `!ctx.objectFiles.empty()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: ./bin/ld.lld -m hexagonelf foo.a -o out
 #0 0x00005cd679e24d47 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (./bin/ld.lld+0x14d4d47)
 #1 0x00005cd679e228ee llvm::sys::RunSignalHandlers() (./bin/ld.lld+0x14d28ee)
 #2 0x00005cd679e256aa SignalHandler(int) Signals.cpp:0:0
 #3 0x0000751db8242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x0000751db82969fc __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #5 0x0000751db82969fc __pthread_kill_internal ./nptl/pthread_kill.c:78:10
 #6 0x0000751db82969fc pthread_kill ./nptl/pthread_kill.c:89:10
 #7 0x0000751db8242476 gsignal ./signal/../sysdeps/posix/raise.c:27:6
 #8 0x0000751db82287f3 abort ./stdlib/abort.c:81:7
 #9 0x0000751db822871b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#10 0x0000751db8239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#11 0x00005cd67a122e93 (./bin/ld.lld+0x17d2e93)
#12 0x00005cd679f35774 void lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::endianness)1, false>>(llvm::opt::InputArgList&) (./bin/ld.lld+0x15e5774)
#13 0x00005cd679f272c0 lld::elf::LinkerDriver::linkerMain(llvm::ArrayRef<char const*>) (./bin/ld.lld+0x15d72c0)
#14 0x00005cd679f254a1 lld::elf::link(llvm::ArrayRef<char const*>, llvm::raw_ostream&, llvm::raw_ostream&, bool, bool) (./bin/ld.lld+0x15d54a1)
#15 0x00005cd679e27a34 lld::unsafeLldMain(llvm::ArrayRef<char const*>, llvm::raw_ostream&, llvm::raw_ostream&, llvm::ArrayRef<lld::DriverDef>, bool) (./bin/ld.lld+0x14d7a34)
#16 0x00005cd679d78ec1 lld_main(int, char**, llvm::ToolContext const&) (./bin/ld.lld+0x1428ec1)
#17 0x00005cd679d794a7 main (./bin/ld.lld+0x14294a7)
#18 0x0000751db8229d90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#19 0x0000751db8229e40 call_init ./csu/../csu/libc-start.c:128:20
#20 0x0000751db8229e40 __libc_start_main ./csu/../csu/libc-start.c:379:5
#21 0x00005cd679d78ae5 _start (./bin/ld.lld+0x1428ae5)

[llvmbot]

@llvm/issue-subscribers-backend-hexagon

Author: Brian Cain (androm3da)

When I try to run the linux kernel build, in some configurations it fails like so:

$ llvm-ar rcsD foo.a
$ ./bin/ld.lld -m hexagonelf foo.a -o out
ld.lld: /home/brian/src/toolchain_for_hexagon/llvm-project/lld/ELF/Arch/Hexagon.cpp:63: virtual uint32_t (anonymous namespace)::Hexagon::calcEFlags() const: Assertion `!ctx.objectFiles.empty()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: ./bin/ld.lld -m hexagonelf foo.a -o out
 #<!-- -->0 0x00005cd679e24d47 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (./bin/ld.lld+0x14d4d47)
 #<!-- -->1 0x00005cd679e228ee llvm::sys::RunSignalHandlers() (./bin/ld.lld+0x14d28ee)
 #<!-- -->2 0x00005cd679e256aa SignalHandler(int) Signals.cpp:0:0
 #<!-- -->3 0x0000751db8242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x0000751db82969fc __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #<!-- -->5 0x0000751db82969fc __pthread_kill_internal ./nptl/pthread_kill.c:78:10
 #<!-- -->6 0x0000751db82969fc pthread_kill ./nptl/pthread_kill.c:89:10
 #<!-- -->7 0x0000751db8242476 gsignal ./signal/../sysdeps/posix/raise.c:27:6
 #<!-- -->8 0x0000751db82287f3 abort ./stdlib/abort.c:81:7
 #<!-- -->9 0x0000751db822871b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#<!-- -->10 0x0000751db8239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#<!-- -->11 0x00005cd67a122e93 (./bin/ld.lld+0x17d2e93)
#<!-- -->12 0x00005cd679f35774 void lld::elf::LinkerDriver::link&lt;llvm::object::ELFType&lt;(llvm::endianness)1, false&gt;&gt;(llvm::opt::InputArgList&amp;) (./bin/ld.lld+0x15e5774)
#<!-- -->13 0x00005cd679f272c0 lld::elf::LinkerDriver::linkerMain(llvm::ArrayRef&lt;char const*&gt;) (./bin/ld.lld+0x15d72c0)
#<!-- -->14 0x00005cd679f254a1 lld::elf::link(llvm::ArrayRef&lt;char const*&gt;, llvm::raw_ostream&amp;, llvm::raw_ostream&amp;, bool, bool) (./bin/ld.lld+0x15d54a1)
#<!-- -->15 0x00005cd679e27a34 lld::unsafeLldMain(llvm::ArrayRef&lt;char const*&gt;, llvm::raw_ostream&amp;, llvm::raw_ostream&amp;, llvm::ArrayRef&lt;lld::DriverDef&gt;, bool) (./bin/ld.lld+0x14d7a34)
#<!-- -->16 0x00005cd679d78ec1 lld_main(int, char**, llvm::ToolContext const&amp;) (./bin/ld.lld+0x1428ec1)
#<!-- -->17 0x00005cd679d794a7 main (./bin/ld.lld+0x14294a7)
#<!-- -->18 0x0000751db8229d90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#<!-- -->19 0x0000751db8229e40 call_init ./csu/../csu/libc-start.c:128:20
#<!-- -->20 0x0000751db8229e40 __libc_start_main ./csu/../csu/libc-start.c:379:5
#<!-- -->21 0x00005cd679d78ae5 _start (./bin/ld.lld+0x1428ae5)

[llvmbot]

@llvm/issue-subscribers-lld-elf

Author: Brian Cain (androm3da)

When I try to run the linux kernel build, in some configurations it fails like so:

$ llvm-ar rcsD foo.a
$ ./bin/ld.lld -m hexagonelf foo.a -o out
ld.lld: /home/brian/src/toolchain_for_hexagon/llvm-project/lld/ELF/Arch/Hexagon.cpp:63: virtual uint32_t (anonymous namespace)::Hexagon::calcEFlags() const: Assertion `!ctx.objectFiles.empty()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: ./bin/ld.lld -m hexagonelf foo.a -o out
 #<!-- -->0 0x00005cd679e24d47 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (./bin/ld.lld+0x14d4d47)
 #<!-- -->1 0x00005cd679e228ee llvm::sys::RunSignalHandlers() (./bin/ld.lld+0x14d28ee)
 #<!-- -->2 0x00005cd679e256aa SignalHandler(int) Signals.cpp:0:0
 #<!-- -->3 0x0000751db8242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x0000751db82969fc __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #<!-- -->5 0x0000751db82969fc __pthread_kill_internal ./nptl/pthread_kill.c:78:10
 #<!-- -->6 0x0000751db82969fc pthread_kill ./nptl/pthread_kill.c:89:10
 #<!-- -->7 0x0000751db8242476 gsignal ./signal/../sysdeps/posix/raise.c:27:6
 #<!-- -->8 0x0000751db82287f3 abort ./stdlib/abort.c:81:7
 #<!-- -->9 0x0000751db822871b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#<!-- -->10 0x0000751db8239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#<!-- -->11 0x00005cd67a122e93 (./bin/ld.lld+0x17d2e93)
#<!-- -->12 0x00005cd679f35774 void lld::elf::LinkerDriver::link&lt;llvm::object::ELFType&lt;(llvm::endianness)1, false&gt;&gt;(llvm::opt::InputArgList&amp;) (./bin/ld.lld+0x15e5774)
#<!-- -->13 0x00005cd679f272c0 lld::elf::LinkerDriver::linkerMain(llvm::ArrayRef&lt;char const*&gt;) (./bin/ld.lld+0x15d72c0)
#<!-- -->14 0x00005cd679f254a1 lld::elf::link(llvm::ArrayRef&lt;char const*&gt;, llvm::raw_ostream&amp;, llvm::raw_ostream&amp;, bool, bool) (./bin/ld.lld+0x15d54a1)
#<!-- -->15 0x00005cd679e27a34 lld::unsafeLldMain(llvm::ArrayRef&lt;char const*&gt;, llvm::raw_ostream&amp;, llvm::raw_ostream&amp;, llvm::ArrayRef&lt;lld::DriverDef&gt;, bool) (./bin/ld.lld+0x14d7a34)
#<!-- -->16 0x00005cd679d78ec1 lld_main(int, char**, llvm::ToolContext const&amp;) (./bin/ld.lld+0x1428ec1)
#<!-- -->17 0x00005cd679d794a7 main (./bin/ld.lld+0x14294a7)
#<!-- -->18 0x0000751db8229d90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#<!-- -->19 0x0000751db8229e40 call_init ./csu/../csu/libc-start.c:128:20
#<!-- -->20 0x0000751db8229e40 __libc_start_main ./csu/../csu/libc-start.c:379:5
#<!-- -->21 0x00005cd679d78ae5 _start (./bin/ld.lld+0x1428ae5)

[androm3da]

This was fixed by #108431

[androm3da]

/cherry-pick d1ba432

[llvmbot]

/pull-request #108661