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llvm: dwo only emitted when object code emitted

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`CompiledModule` should not think a DWARF object was emitted when a
bitcode-only compilation has happened, this can confuse archive file
creation (which expects to create an archive containing non-existent dwo
files).

Signed-off-by: David Wood <david.wood@huawei.com>
This commit is contained in:
David Wood 2022-11-07 15:15:24 +00:00
parent 9bcc083c87
commit 29dc08307d
3 changed files with 68 additions and 5 deletions
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16
compiler/rustc_codegen_llvm/src/back/write.rs
View File

@ -765,11 +765,21 @@ pub(crate) unsafe fn codegen(
drop(handlers);
}
// `.dwo` files are only emitted if:
//
// - Object files are being emitted (i.e. bitcode only or metadata only compilations will not
// produce dwarf objects, even if otherwise enabled)
// - Target supports Split DWARF
// - Split debuginfo is enabled
// - Split DWARF kind is `split` (i.e. debuginfo is split into `.dwo` files, not different
// sections in the `.o` files).
let dwarf_object_emitted = matches!(config.emit_obj, EmitObj::ObjectCode(_))
&& cgcx.target_can_use_split_dwarf
&& cgcx.split_debuginfo != SplitDebuginfo::Off
&& cgcx.split_dwarf_kind == SplitDwarfKind::Split;
Ok(module.into_compiled_module(
config.emit_obj != EmitObj::None,
cgcx.target_can_use_split_dwarf
&& cgcx.split_debuginfo != SplitDebuginfo::Off
&& cgcx.split_dwarf_kind == SplitDwarfKind::Split,
dwarf_object_emitted,
config.emit_bc,
&cgcx.output_filenames,
))

56
src/test/run-make-fulldeps/split-debuginfo/Makefile
View File

@ -53,7 +53,7 @@ off:
[ ! -f $(TMPDIR)/*.dwp ]
[ ! -f $(TMPDIR)/*.dwo ]
packed: packed-split packed-single packed-remapped packed-crosscrate
packed: packed-split packed-single packed-lto packed-remapped packed-crosscrate
# - Debuginfo in `.dwo` files
# - `.o` deleted
@ -77,6 +77,32 @@ packed-single:
rm $(TMPDIR)/foo.dwp
rm $(TMPDIR)/$(call BIN,foo)
packed-lto: packed-lto-split packed-lto-single
# - rmeta file added to rlib, no object files are generated and thus no debuginfo is generated
# - `.o` never created
# - `.dwo` never created
# - `.dwp` never created
packed-lto-split:
$(RUSTC) baz.rs -g $(UNSTABLEOPTS) -Csplit-debuginfo=packed -Zsplit-dwarf-kind=split \
--crate-type=rlib -Clinker-plugin-lto
ls $(TMPDIR)/*.o && exit 1 || exit 0
ls $(TMPDIR)/*.dwo && exit 1 || exit 0
ls $(TMPDIR)/*.dwp && exit 1 || exit 0
rm $(TMPDIR)/libbaz.rlib
# - rmeta file added to rlib, no object files are generated and thus no debuginfo is generated
# - `.o` never created
# - `.dwo` never created
# - `.dwp` never created
packed-lto-single:
$(RUSTC) baz.rs -g $(UNSTABLEOPTS) -Csplit-debuginfo=packed -Zsplit-dwarf-kind=single \
--crate-type=rlib -Clinker-plugin-lto
ls $(TMPDIR)/*.o && exit 1 || exit 0
ls $(TMPDIR)/*.dwo && exit 1 || exit 0
ls $(TMPDIR)/*.dwp && exit 1 || exit 0
rm $(TMPDIR)/libbaz.rlib
packed-remapped: packed-remapped-split packed-remapped-single
# - Debuginfo in `.dwo` files
@ -153,7 +179,7 @@ packed-crosscrate-single:
rm $(TMPDIR)/main.dwp
rm $(TMPDIR)/$(call BIN,main)
unpacked: unpacked-split unpacked-single unpacked-remapped unpacked-crosscrate
unpacked: unpacked-split unpacked-single unpacked-lto unpacked-remapped unpacked-crosscrate
# - Debuginfo in `.dwo` files
# - `.o` deleted
@ -177,6 +203,32 @@ unpacked-single:
ls $(TMPDIR)/*.dwp && exit 1 || exit 0
rm $(TMPDIR)/$(call BIN,foo)
unpacked-lto: packed-lto-split packed-lto-single
# - rmeta file added to rlib, no object files are generated and thus no debuginfo is generated
# - `.o` never created
# - `.dwo` never created
# - `.dwp` never created
unpacked-lto-split:
$(RUSTC) baz.rs -g $(UNSTABLEOPTS) -Csplit-debuginfo=unpacked -Zsplit-dwarf-kind=split \
--crate-type=rlib -Clinker-plugin-lto
ls $(TMPDIR)/*.o && exit 1 || exit 0
ls $(TMPDIR)/*.dwo && exit 1 || exit 0
ls $(TMPDIR)/*.dwp && exit 1 || exit 0
rm $(TMPDIR)/libbaz.rlib
# - rmeta file added to rlib, no object files are generated and thus no debuginfo is generated
# - `.o` never created
# - `.dwo` never created
# - `.dwp` never created
unpacked-lto-single:
$(RUSTC) baz.rs -g $(UNSTABLEOPTS) -Csplit-debuginfo=unpacked -Zsplit-dwarf-kind=single \
--crate-type=rlib -Clinker-plugin-lto
ls $(TMPDIR)/*.o && exit 1 || exit 0
ls $(TMPDIR)/*.dwo && exit 1 || exit 0
ls $(TMPDIR)/*.dwp && exit 1 || exit 0
rm $(TMPDIR)/libbaz.rlib
unpacked-remapped: unpacked-remapped-split unpacked-remapped-single
# - Debuginfo in `.dwo` files

1
src/test/run-make-fulldeps/split-debuginfo/baz.rs Normal file
View File

@ -0,0 +1 @@
// empty