REQUIRES: x86-registered-target, ld.lld

# This test verifies that a cache populated by an in-process ThinLTO codegen is
# not reused by an out-of-process (DTLTO) codegen and vice versa.

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

# Compile source files into bitcode files.
RUN: %clang -O2 --target=x86_64-linux-gnu -flto=thin -c foo.c main.c

# Execute the linker and check that in-process ThinLTO cache is populated.
RUN: %clang -O2 --target=x86_64-linux-gnu -Werror -flto=thin -fuse-ld=lld -nostdlib -e main \
RUN:   main.o foo.o -o main.elf \
RUN:   -Wl,--thinlto-cache-dir=cache.dir \
RUN:   -Wl,--save-temps

RUN: ls cache.dir/llvmcache.timestamp
RUN: ls cache.dir | count 3

# Execute the linker and check that out-of-process codegen (DTLTO) adds
# additional entries to the cache, implying that in-process and
# out-of-process codegens do not share cache entries.
RUN: %clang -O2 --target=x86_64-linux-gnu -Werror -flto=thin -fuse-ld=lld -nostdlib -e main \
RUN:   main.o foo.o -o populate1.elf \
RUN:   -Wl,--thinlto-distributor=%python \
RUN:   -Wl,--thinlto-distributor-arg=%llvm_src_root/utils/dtlto/local.py \
RUN:   -Wl,--thinlto-remote-compiler=%clang \
RUN:   -Wl,--thinlto-cache-dir=cache.dir \
RUN:   -Wl,--save-temps

# Check that there are two backend compilation jobs occurred.
RUN: grep -wo args populate1.*.dist-file.json | wc -l | grep -qx "\s*3"
RUN: ls cache.dir | count 5

# Clean up cache directory.
RUN: rm -rf cache.dir

# Execute the linker and check that out-of-process (DTLTO) cache is populated.
RUN: %clang -O2 --target=x86_64-linux-gnu -Werror -flto=thin -fuse-ld=lld -nostdlib -e main \
RUN:   main.o foo.o -o populate2.elf \
RUN:   -Wl,--thinlto-distributor=%python \
RUN:   -Wl,--thinlto-distributor-arg=%llvm_src_root/utils/dtlto/local.py \
RUN:   -Wl,--thinlto-remote-compiler=%clang \
RUN:   -Wl,--thinlto-cache-dir=cache.dir \
RUN:   -Wl,--save-temps

# Check that there are two backend compilation jobs occurred.
RUN: grep -wo args populate2.*.dist-file.json | wc -l | grep -qx "\s*3"
RUN: ls cache.dir/llvmcache.timestamp
RUN: ls cache.dir | count 3

# Execute the linker and check that in-process codegen adds additional entries
# to the cache, implying that in-process and out-of-process codegens do
# not share cache entries.
RUN: %clang -O2 --target=x86_64-linux-gnu -Werror -flto=thin -fuse-ld=lld -nostdlib -e main \
RUN:   main.o foo.o -o main.elf \
RUN:   -Wl,--thinlto-cache-dir=cache.dir \
RUN:   -Wl,--save-temps

RUN: ls cache.dir | count 5

#--- foo.c
volatile int foo_int;
__attribute__((retain)) int foo(int x) { return x + foo_int; }

#--- main.c
extern int foo(int x);
__attribute__((retain)) int main(int argc, char** argv) {
  return foo(argc);
}