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[fuzz] Determine flags based on compiler version

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This commit is contained in:
Nick Terrell 2017-09-25 15:00:50 -07:00
parent 77d5bc2d62
commit 917a213254
1 changed files with 29 additions and 1 deletions
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30
tests/fuzz/fuzz.py
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@ -140,6 +140,34 @@ def parse_env_flags(args, flags):
return args
def compiler_version(cc, cxx):
"""
Determines the compiler and version.
Only works for clang and gcc.
"""
cc_version_bytes = subprocess.check_output([cc, "--version"])
cxx_version_bytes = subprocess.check_output([cxx, "--version"])
if cc_version_bytes.startswith(b'clang'):
assert(cxx_version_bytes.startswith(b'clang'))
compiler = 'clang'
if cc_version_bytes.startswith(b'gcc'):
assert(cxx_version_bytes.startswith(b'g++'))
compiler = 'gcc'
version_regex = b'([0-9])+\.([0-9])+\.([0-9])+'
version_match = re.search(version_regex, cc_version_bytes)
version = tuple(int(version_match.group(i)) for i in range(1, 4))
return compiler, version
def overflow_ubsan_flags(cc, cxx):
compiler, version = compiler_version(cc, cxx)
if compiler == 'gcc':
return ['-fno-sanitize=signed-integer-overflow']
if compiler == 'clang' and version >= (5, 0, 0):
return ['-fno-sanitize=pointer-overflow']
return []
def build_parser(args):
description = """
Cleans the repository and builds a fuzz target (or all).
@ -364,7 +392,7 @@ def build(args):
if args.ubsan:
ubsan_flags = ['-fsanitize=undefined']
if not args.ubsan_pointer_overflow:
ubsan_flags += ['-fno-sanitize=pointer-overflow']
ubsan_flags += overflow_ubsan_flags(cc, cxx)
common_flags += ubsan_flags
if args.stateful_fuzzing: