Add test for GCC bug 90348

Github-Pull: #15985
Rebased-From: 58e291cfad
This commit is contained in:
Pieter Wuille 2019-05-08 13:29:44 -07:00 committed by fanquake
parent 05fb9f7fbb
commit b5a4abeca2
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2 changed files with 44 additions and 0 deletions

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@ -43,6 +43,7 @@ BITCOIN_TESTS =\
test/bswap_tests.cpp \
test/checkqueue_tests.cpp \
test/coins_tests.cpp \
test/compilerbug_tests.cpp \
test/compress_tests.cpp \
test/crypto_tests.cpp \
test/cuckoocache_tests.cpp \

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@ -0,0 +1,43 @@
// Copyright (c) 2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <test/test_bitcoin.h>
#include <boost/test/unit_test.hpp>
BOOST_FIXTURE_TEST_SUITE(compilerbug_tests, BasicTestingSetup)
#if defined(__GNUC__)
// This block will also be built under clang, which is fine (as it supports noinline)
void __attribute__ ((noinline)) set_one(unsigned char* ptr)
{
*ptr = 1;
}
int __attribute__ ((noinline)) check_zero(unsigned char const* in, unsigned int len)
{
for (unsigned int i = 0; i < len; ++i) {
if (in[i] != 0) return 0;
}
return 1;
}
void set_one_on_stack() {
unsigned char buf[1];
set_one(buf);
}
BOOST_AUTO_TEST_CASE(gccbug_90348) {
// Test for GCC bug 90348. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90348
for (int i = 0; i <= 4; ++i) {
unsigned char in[4];
for (int j = 0; j < i; ++j) {
in[j] = 0;
set_one_on_stack(); // Apparently modifies in[0]
}
BOOST_CHECK(check_zero(in, i));
}
}
#endif
BOOST_AUTO_TEST_SUITE_END()