This repo acts as a reproducer for Folly Issue #1444.
If you want to see this file already on Godbolt, please go here: https://godbolt.org/z/rcr8W7
The error looks like this:
pre_generated_1444.cpp: In function ‘void FixedStringEraseTestCEraseTest()’:
pre_generated_1444.cpp:3765:42: in ‘constexpr’ expansion of ‘x.folly::BasicFixedString<char, 26>::cerase(x.folly::BasicFixedString<char, 26>::size(), ((std::size_t)folly::detail::fixedstring::FixedStringBase_<>::npos))’
pre_generated_1444.cpp:1790:20: in ‘constexpr’ expansion of ‘((const folly::BasicFixedString<char, 26>*)this)->folly::BasicFixedString<char, 26>::creplace<1>(pos, folly::detail::fixedstring::checkOverflowOrNpos(count, (((long unsigned int)((const folly::BasicFixedString<char, 26>*)this)->folly::BasicFixedString<char, 26>::size_) - folly::detail::fixedstring::checkOverflow(pos, ((std::size_t)((const folly::BasicFixedString<char, 26>*)this)->folly::BasicFixedString<char, 26>::size_)))), A{'\000'})’
pre_generated_1444.cpp:2212:20: in ‘constexpr’ expansion of ‘((const folly::BasicFixedString<char, 26>*)this)->folly::BasicFixedString<char, 26>::creplace<1>(this_pos, this_count, (* & that), 0, (1 - 1))’
pre_generated_1444.cpp:2252:49: in ‘constexpr’ expansion of ‘folly::detail::fixedstring::checkNullTerminated<char, 1>((* & that))’
pre_generated_1444.cpp:493:61: in ‘constexpr’ expansion of ‘folly::constexpr_strlen<char>(((const char*)a))’
pre_generated_1444.cpp:382:43: in ‘constexpr’ expansion of ‘folly::detail::constexpr_strlen_internal<char>(s, 0)’
pre_generated_1444.cpp:329:29: error: ‘__builtin_strlen(((const char*)(&<anonymous>)))’ is not a constant expression
329 | return FOLLY_DETAIL_STRLEN(s);
| ^
pre_generated_1444.cpp:3766:21: error: non-constant condition for static assertion
3766 | static_assert(26u == tmp0.size(), "");
| ~~~~^~~~~~~~~~~~~~
pre_generated_1444.cpp:3767:19: error: non-constant condition for static assertion
3767 | static_assert(y == tmp0, "");
| ~~^~~~~~~
pre_generated_1444.cpp:3769:21: error: non-constant condition for static assertion
3769 | static_assert(24u == tmp1.size(), "");
| ~~~~^~~~~~~~~~~~~~
pre_generated_1444.cpp:3770:44: error: non-constant condition for static assertion
3770 | static_assert("abcdefghijklmnopqrstuvwx" == tmp1, "");
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
pre_generated_1444.cpp:3772:20: error: non-constant condition for static assertion
3772 | static_assert(2u == tmp2.size(), "");
| ~~~^~~~~~~~~~~~~~
pre_generated_1444.cpp:3773:22: error: non-constant condition for static assertion
3773 | static_assert("ax" == tmp2, "");
| ~~~~~^~~~~~~You can re-generate a reproducer by running the script: build_reproducer.sh. This script merges the files:
folly/CPortability.hfolly/portability/Constexpr.hfolly/FixedString.hfolly/test/FixedStringTest.cpp
into a single file and adds an additional "header block" to ensure that the file compiles.
If you do not wish to run build_reproducer.sh, a pre-build version exists in this repo: pre_generated_1444.cpp.
This has been verified on:
$ lsb-release -a
LSB Version: n/a
Distributor ID: openSUSE
Description: openSUSE Tumbleweed
Release: 20210223
Codename: n/a
$ ldd --version ldd
ldd (GNU libc) 2.33
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.
$ g++ --version
g++ (SUSE Linux) 10.2.1 20201202 [revision e563687cf9d3d1278f45aaebd03e0f66531076c9]
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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