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dead-strip-dylibs.s
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# REQUIRES: x86
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# RUN: rm -rf %t; split-file %s %t
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# RUN: llvm-mc %t/bar.s -triple=x86_64-apple-macos -filetype=obj -o %t/bar.o
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# RUN: %lld -dylib %t/bar.o -o %t/bar.dylib
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# RUN: %lld -dylib %t/bar.o -o %t/libbar.dylib
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# RUN: %lld -dylib -mark_dead_strippable_dylib %t/bar.o -o %t/bar-strip.dylib
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# RUN: llvm-mc %t/foo.s -triple=x86_64-apple-macos -filetype=obj -o %t/foo.o
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# RUN: %lld -dylib %t/foo.o -o %t/foo_with_bar.dylib %t/bar.dylib -sub_library bar
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# RUN: %lld -dylib %t/foo.o -o %t/foo.dylib
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# RUN: llvm-mc %t/weak-foo.s -triple=x86_64-apple-macos -filetype=obj -o %t/weak-foo.o
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# RUN: %lld -dylib %t/weak-foo.o -o %t/weak-foo.dylib
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# RUN: llvm-mc %t/main.s -triple=x86_64-apple-macos -filetype=obj -o %t/main.o
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## foo_with_bar.dylib's reexport should be dropped since it's linked implicitly.
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# RUN: %lld -lSystem %t/main.o -o %t/main %t/foo_with_bar.dylib
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOBAR %s
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# NOBAR-NOT: bar.dylib
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# NOBAR: /usr/lib/libSystem.dylib
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# NOBAR-NOT: bar.dylib
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# NOBAR: foo_with_bar.dylib
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# NOBAR-NOT: bar.dylib
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## If bar.dylib is linked explicitly, it should not be dropped.
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# RUN: %lld -lSystem %t/main.o -o %t/main %t/foo_with_bar.dylib %t/bar.dylib
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=BAR %s
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# BAR: /usr/lib/libSystem.dylib
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# BAR: foo_with_bar.dylib
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# BAR: bar.dylib
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## ...except if -dead-strip_dylibs is passed...
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# RUN: %lld -lSystem %t/main.o -o %t/main %t/foo_with_bar.dylib %t/bar.dylib \
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# RUN:      -dead_strip_dylibs
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOBAR %s
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## ...or bar is explicitly marked dead-strippable.
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# RUN: %lld -lSystem %t/main.o -o %t/main %t/foo.dylib %t/bar-strip.dylib
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOBARSTRIP %s
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# NOBARSTRIP-NOT: bar-strip.dylib
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# NOBARSTRIP: /usr/lib/libSystem.dylib
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# NOBARSTRIP-NOT: bar-strip.dylib
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# NOBARSTRIP: foo.dylib
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# NOBARSTRIP-NOT: bar-strip.dylib
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## Even libraries explicitly reexported with -reexport_library are stripped
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## if they are not referenced.
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# RUN: %lld -lSystem %t/main.o -o %t/main %t/foo_with_bar.dylib \
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# RUN:     -reexport_library %t/bar.dylib -dead_strip_dylibs
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOBAR %s
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# RUN: llvm-otool -l %t/main | FileCheck --check-prefix=NOREEXPORT %s
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# NOREEXPORT-NOT: LC_REEXPORT_DYLIB
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## But -needed_library and -needed-l win over -dead_strip_dylibs again.
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# RUN: %lld -lSystem %t/main.o -o %t/main %t/foo_with_bar.dylib \
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# RUN:     -needed_library %t/bar.dylib -dead_strip_dylibs
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=BAR %s
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# RUN: %lld -lSystem %t/main.o -o %t/main %t/foo_with_bar.dylib \
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# RUN:     -L%t -needed-lbar -dead_strip_dylibs
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=BAR %s
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## LC_LINKER_OPTION does not count as an explicit reference.
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# RUN: llvm-mc %t/linkopt_bar.s -triple=x86_64-apple-macos -filetype=obj -o %t/linkopt_bar.o
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# RUN: %lld -lSystem %t/main.o %t/linkopt_bar.o -o %t/main -L %t %t/foo.dylib
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOLIBBAR %s
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# NOLIBBAR-NOT: libbar.dylib
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# NOLIBBAR: /usr/lib/libSystem.dylib
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# NOLIBBAR-NOT: libbar.dylib
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# NOLIBBAR: foo.dylib
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# NOLIBBAR-NOT: libbar.dylib
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## ...but with an additional explicit reference it's not stripped again.
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# RUN: %lld -lSystem %t/main.o %t/linkopt_bar.o -o %t/main -L %t %t/foo.dylib -lbar
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=LIBBAR %s
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# RUN: %lld -lSystem %t/main.o -o %t/main -L %t %t/foo.dylib -lbar %t/linkopt_bar.o
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=LIBBAR %s
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# LIBBAR-DAG: /usr/lib/libSystem.dylib
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# LIBBAR-DAG: libbar.dylib
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# LIBBAR-DAG: foo.dylib
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## Test that a DylibSymbol being replaced by a DefinedSymbol marks the
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## dylib as unreferenced.
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## (Note: Since there's no dynamic linking in this example, libSystem is
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## stripped too. Since libSystem.dylib is needed to run an executable for
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## LC_MAIN, the output would crash when run. This matches ld64's behavior (!)
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## In practice, every executable uses dynamic linking, which uses
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## dyld_stub_binder, which keeps libSystem alive.)
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## Test all permutations of (Undefined, Defined, DylibSymbol).
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# RUN: %lld -lSystem -dead_strip_dylibs %t/main.o %t/foo.o %t/foo.dylib -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOFOO %s
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# RUN: %lld -lSystem -dead_strip_dylibs %t/main.o %t/foo.dylib %t/foo.dylib %t/foo.o -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOFOO %s
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# RUN: %lld -lSystem -dead_strip_dylibs %t/foo.o %t/main.o %t/foo.dylib -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOFOO %s
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# RUN: %lld -lSystem -dead_strip_dylibs %t/foo.dylib %t/foo.dylib %t/main.o %t/foo.o -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOFOO %s
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# RUN: %lld -lSystem -dead_strip_dylibs %t/foo.o %t/foo.dylib %t/main.o -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOFOO %s
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# RUN: %lld -lSystem -dead_strip_dylibs %t/foo.dylib %t/foo.dylib %t/foo.o %t/main.o -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOFOO %s
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# NOFOO-NOT: foo.dylib
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## When linking a weak and a strong symbol from two dylibs, we should keep the
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## strong one.
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# RUN: %lld -lSystem -dead_strip_dylibs %t/main.o %t/foo.dylib %t/weak-foo.dylib -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOWEAK %s
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# RUN: %lld -lSystem -dead_strip_dylibs %t/main.o %t/weak-foo.dylib %t/foo.dylib -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOWEAK %s
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# RUN: %lld -lSystem -dead_strip_dylibs %t/foo.dylib %t/weak-foo.dylib %t/main.o -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOWEAK %s
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# RUN: %lld -lSystem -dead_strip_dylibs %t/weak-foo.dylib %t/foo.dylib %t/main.o -o %t/main
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# RUN: llvm-otool -L %t/main | FileCheck --check-prefix=NOWEAK %s
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# NOWEAK-NOT: weak-foo.dylib
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# NOWEAK: /foo.dylib
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# NOWEAK-NOT: weak-foo.dylib
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#--- main.s
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.globl _foo, _main
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_main:
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  callq _foo
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  retq
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#--- foo.s
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.globl _foo
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_foo:
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  retq
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#--- bar.s
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.globl _bar
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_bar:
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  retq
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#--- linkopt_bar.s
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.linker_option "-lbar"
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#--- weak-foo.s
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.globl _foo
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.weak_definition _foo
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_foo:
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  retq
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