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