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When doing linker-plugin based LTO, write LLVM bitcode obj-files

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instead of embedding the bitcode into the regular object file.
This commit is contained in:
Michael Woerister 2018-07-06 13:58:25 +02:00
parent 65ff4141a5
commit 72df804d8e
3 changed files with 24 additions and 28 deletions
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2
src/librustc/session/config.rs
View File

@ -104,7 +104,7 @@ pub enum CrossLangLto {
}
impl CrossLangLto {
pub fn embed_bitcode(&self) -> bool {
pub fn enabled(&self) -> bool {
match *self {
CrossLangLto::LinkerPlugin(_) |
CrossLangLto::LinkerPluginAuto |

8
src/librustc_codegen_llvm/back/write.rs
View File

@ -288,10 +288,10 @@ impl ModuleConfig {
self.no_builtins = no_builtins || sess.target.target.options.no_builtins;
self.time_passes = sess.time_passes();
self.inline_threshold = sess.opts.cg.inline_threshold;
self.obj_is_bitcode = sess.target.target.options.obj_is_bitcode;
self.obj_is_bitcode = sess.target.target.options.obj_is_bitcode ||
sess.opts.debugging_opts.cross_lang_lto.enabled();
let embed_bitcode = sess.target.target.options.embed_bitcode ||
sess.opts.debugging_opts.embed_bitcode ||
sess.opts.debugging_opts.cross_lang_lto.embed_bitcode();
sess.opts.debugging_opts.embed_bitcode;
if embed_bitcode {
match sess.opts.optimize {
config::OptLevel::No |
@ -1365,7 +1365,7 @@ fn execute_work_item(cgcx: &CodegenContext,
// Don't run LTO passes when cross-lang LTO is enabled. The linker
// will do that for us in this case.
let needs_lto = needs_lto &&
!cgcx.opts.debugging_opts.cross_lang_lto.embed_bitcode();
!cgcx.opts.debugging_opts.cross_lang_lto.enabled();
if needs_lto {
Ok(WorkItemResult::NeedsLTO(module))

42
src/test/run-make-fulldeps/cross-lang-lto/Makefile
View File

@ -1,53 +1,49 @@
# min-llvm-version 4.0
# ignore-mingw
# ignore-msvc
-include ../tools.mk
# This test makes sure that the expected .llvmbc sections for use by
# linker-based LTO are available in object files when compiling with
# -Z cross-lang-lto
# This test makes sure that the object files we generate are actually
# LLVM bitcode files (as used by linker LTO plugins) when compiling with
# -Z cross-lang-lto.
LLVMBC_SECTION_NAME=\\.llvmbc
ASSERT_IS_BITCODE_OBJ=llvm-bcanalyzer # this only succeeds for bitcode files
EXTRACT_OBJS=(cd $(TMPDIR); rm -f ./*.o; llvm-ar x $(1))
ifeq ($(UNAME),Darwin)
LLVMBC_SECTION_NAME=__bitcode
endif
OBJDUMP=llvm-objdump
SECTION_HEADERS=$(OBJDUMP) -section-headers
BUILD_LIB=$(RUSTC) lib.rs -Copt-level=2 -Z cross-lang-lto=no-link -Ccodegen-units=1
BUILD_EXE=$(RUSTC) main.rs -Copt-level=2 -Z cross-lang-lto=no-link -Ccodegen-units=1 --emit=obj
BUILD_LIB=$(RUSTC) lib.rs -Copt-level=2 -Z cross-lang-lto=on -Ccodegen-units=1
BUILD_EXE=$(RUSTC) main.rs -Copt-level=2 -Z cross-lang-lto=on -Ccodegen-units=1 --emit=obj
all: staticlib staticlib-fat-lto staticlib-thin-lto rlib exe cdylib rdylib
staticlib: lib.rs
$(BUILD_LIB) --crate-type=staticlib -o $(TMPDIR)/liblib.a
[ "$$($(SECTION_HEADERS) $(TMPDIR)/liblib.a | grep -c $(LLVMBC_SECTION_NAME))" -ne "0" ]
$(call EXTRACT_OBJS, liblib.a)
$(ASSERT_IS_BITCODE_OBJ) $(TMPDIR)/liblib.lib0.rcgu.o
staticlib-fat-lto: lib.rs
$(BUILD_LIB) --crate-type=staticlib -o $(TMPDIR)/liblib-fat-lto.a -Clto=fat
[ "$$($(SECTION_HEADERS) $(TMPDIR)/liblib-fat-lto.a | grep -c $(LLVMBC_SECTION_NAME))" -ne "0" ]
$(call EXTRACT_OBJS, liblib-fat-lto.a)
$(ASSERT_IS_BITCODE_OBJ) $(TMPDIR)/liblib-fat-lto.lib0.rcgu.o
staticlib-thin-lto: lib.rs
$(BUILD_LIB) --crate-type=staticlib -o $(TMPDIR)/liblib-thin-lto.a -Clto=thin
[ "$$($(SECTION_HEADERS) $(TMPDIR)/liblib-thin-lto.a | grep -c $(LLVMBC_SECTION_NAME))" -ne "0" ]
$(call EXTRACT_OBJS, liblib-thin-lto.a)
$(ASSERT_IS_BITCODE_OBJ) $(TMPDIR)/liblib-thin-lto.lib0.rcgu.o
rlib: lib.rs
$(BUILD_LIB) --crate-type=rlib -o $(TMPDIR)/liblib.rlib
[ "$$($(SECTION_HEADERS) $(TMPDIR)/liblib.rlib | grep -c $(LLVMBC_SECTION_NAME))" -ne "0" ]
$(call EXTRACT_OBJS, liblib.rlib)
$(ASSERT_IS_BITCODE_OBJ) $(TMPDIR)/liblib.lib0.rcgu.o
cdylib: lib.rs
$(BUILD_LIB) --crate-type=cdylib --emit=obj -o $(TMPDIR)/cdylib.o
[ "$$($(SECTION_HEADERS) $(TMPDIR)/cdylib.o | grep -c $(LLVMBC_SECTION_NAME))" -ne "0" ]
$(ASSERT_IS_BITCODE_OBJ) $(TMPDIR)/cdylib.o
rdylib: lib.rs
$(BUILD_LIB) --crate-type=dylib --emit=obj -o $(TMPDIR)/rdylib.o
[ "$$($(SECTION_HEADERS) $(TMPDIR)/rdylib.o | grep -c $(LLVMBC_SECTION_NAME))" -ne "0" ]
$(ASSERT_IS_BITCODE_OBJ) $(TMPDIR)/rdylib.o
exe: lib.rs
$(BUILD_EXE) -o $(TMPDIR)/exe.o
[ "$$($(SECTION_HEADERS) $(TMPDIR)/exe.o | grep -c $(LLVMBC_SECTION_NAME))" -ne "0" ]
$(ASSERT_IS_BITCODE_OBJ) $(TMPDIR)/exe.o