d45054dbd2
Summary: As discussed in https://github.com/google/oss-fuzz/issues/933, it would be really awesome to be able to use ThinLTO for fuzzing. However, as @kcc has pointed out, it is currently undefined (untested) whether the sanitizers actually function properly with LLD and/or LTO. This patch is inspired by the cfi test, which already do test with LTO (and/or LLD), since LTO is required for CFI to function. I started with UBSan, because it's cmakelists / lit.* files appeared to be the cleanest. This patch adds the infrastructure to easily add LLD and/or LTO sub-variants of the existing lit test configurations. Also, this patch adds the LLD flavor, that explicitly does use LLD to link. The check-ubsan does pass on my machine. And to minimize the [initial] potential buildbot breakage i have put some restrictions on this flavour. Please review carefully, i have not worked with lit/sanitizer tests before. The original attempt, r319525 was reverted in r319526 due to the failures in compiler-rt standalone builds. Reviewers: eugenis, vitalybuka Reviewed By: eugenis Subscribers: #sanitizers, pcc, kubamracek, mgorny, llvm-commits, mehdi_amini, inglorion, kcc Differential Revision: https://reviews.llvm.org/D39508 llvm-svn: 319575
41 lines
1.1 KiB
INI
41 lines
1.1 KiB
INI
import subprocess
|
|
|
|
def getRoot(config):
|
|
if not config.parent:
|
|
return config
|
|
return getRoot(config.parent)
|
|
|
|
|
|
def is_gold_linker_available():
|
|
|
|
if not config.gold_executable:
|
|
return False
|
|
try:
|
|
ld_cmd = subprocess.Popen([config.gold_executable, '--help'], stdout = subprocess.PIPE)
|
|
ld_out = ld_cmd.stdout.read().decode()
|
|
ld_cmd.wait()
|
|
except:
|
|
return False
|
|
|
|
if not '-plugin' in ld_out:
|
|
return False
|
|
|
|
# config.clang is not guaranteed to be just the executable!
|
|
clang_cmd = subprocess.Popen(" ".join([config.clang, '-fuse-ld=gold', '-xc', '-']),
|
|
shell=True,
|
|
universal_newlines = True,
|
|
stdin = subprocess.PIPE,
|
|
stdout = subprocess.PIPE,
|
|
stderr = subprocess.PIPE)
|
|
clang_err = clang_cmd.communicate('int main() { return 0; }')[1]
|
|
|
|
if not 'invalid linker' in clang_err:
|
|
return True
|
|
|
|
return False
|
|
|
|
root = getRoot(config)
|
|
|
|
if root.host_os not in ['Linux'] or not is_gold_linker_available():
|
|
config.unsupported = True
|