TheRock/compiler/amd-llvm/cross-project-tests/dtlto/multimodule.test

REQUIRES: x86-registered-target,ld.lld,llvm-ar

# Test that a DTLTO link succeeds with a multi-module (via -fsplit-lto-unit)
# bitcode file. We use an archive, as archive member inputs exercise more of
# the DTLTO specific code than other input file types.

RUN: rm -rf %t && split-file %s %t && cd %t

RUN: %clang -O2 --target=x86_64-linux-gnu -flto=thin -c usebar.cc \
RUN:   -fno-rtti -fno-exceptions -fsplit-lto-unit 

# Sanity check that multi-module bitcode was produced.
RUN: not llvm-modextract -n 2 usebar.o -o - 2>&1 \
RUN:   | FileCheck %s --check-prefix=TWO
TWO: bitcode file contains 2 module(s)

# Create an archive.
RUN: llvm-ar rcs usebar.a usebar.o

# Build with DTLTO.
RUN: %clang -O2 --target=x86_64-linux-gnu -flto=thin -fuse-ld=lld \
RUN:   -nostdlib -shared -Wl,--whole-archive,--allow-shlib-undefined usebar.a \
RUN:   -fthinlto-distributor=%python \
RUN:   -Xthinlto-distributor=%llvm_src_root/utils/dtlto/local.py \
RUN:   -Wl,--save-temps

RUN: ls | sort | FileCheck %s

# DTLTO JSON file - confirms DTLTO occurred.
CHECK: .dist-file.json

# .native.o exists - confirms archive member usebar.o participated in DTLTO.
CHECK: {{^}}usebar.a(usebar.o
CHECK-SAME: .native.o

#--- usebar.cc
// Minimal C++ input to exercise multi-module emission with -fsplit-lto-unit.
struct A { virtual int foo(); };
int bar(A *a);

struct B : A { int foo() { return 2; } };
int use() { static B b; return bar(&b); }