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Bug 1712023 - Avoid up to @GLIBCXX_3.4.29 symbols for stdc++ compat. r=firefox-build-system-reviewers,mhentges

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Differential Revision: https://phabricator.services.mozilla.com/D115562
This commit is contained in:
Mike Hommey 2021-05-20 22:32:10 +00:00
parent c3d194a44b
commit c8b5ca1f93
1 changed files with 48 additions and 1 deletions
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49
build/unix/stdc++compat/stdc++compat.cpp
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@ -4,6 +4,7 @@
#include <ostream>
#include <istream>
#include <sstream>
#include <memory>
#include <string>
#include <stdarg.h>
@ -16,7 +17,13 @@
GLIBCXX_3.4.20 is from gcc 4.9.0 (199307)
GLIBCXX_3.4.21 is from gcc 5.0 (210290)
GLIBCXX_3.4.22 is from gcc 6.0 (222482)
GLIBCXX_3.4.23 is from gcc 7.0
GLIBCXX_3.4.23 is from gcc 7
GLIBCXX_3.4.24 is from gcc 8
GLIBCXX_3.4.25 is from gcc 8
GLIBCXX_3.4.26 is from gcc 9
GLIBCXX_3.4.27 is from gcc 10
GLIBCXX_3.4.28 is from gcc 10
GLIBCXX_3.4.29 is from gcc 11
This file adds the necessary compatibility tricks to avoid symbols with
version GLIBCXX_3.4.20 and bigger, keeping binary compatibility with
@ -59,6 +66,14 @@ extern "C" void __attribute__((weak)) __cxa_throw_bad_array_new_length() {
} // namespace __cxxabiv1
#endif
#if MOZ_LIBSTDCXX_VERSION >= GLIBCXX_VERSION(3, 4, 29)
namespace std {
void __attribute__((weak)) __throw_bad_array_new_length() { MOZ_CRASH(); }
} // namespace std
#endif
#if MOZ_LIBSTDCXX_VERSION >= GLIBCXX_VERSION(3, 4, 21)
/* While we generally don't build with exceptions, we have some host tools
* that do use them. libstdc++ from GCC 5.0 added exception constructors with
@ -111,6 +126,22 @@ __attribute__((weak)) void thread::_M_start_thread(unique_ptr<_State> aState,
* even though the destructor is default there too */
__attribute__((weak)) thread::_State::~_State() = default;
# endif
# if MOZ_LIBSTDCXX_VERSION >= GLIBCXX_VERSION(3, 4, 26)
// Ideally we'd define
// bool _Sp_make_shared_tag::_S_eq(const type_info& ti) noexcept
// but we wouldn't be able to change its visibility because of the existing
// definition in C++ headers. We do need to change its visibility because we
// don't want it to be shadowing the one provided by libstdc++ itself, because
// it doesn't support RTTI. Not supporting RTTI doesn't matter for Firefox
// itself because it's built with RTTI disabled.
// So we define via the mangled symbol.
extern "C" __attribute__((visibility("hidden"))) bool
_ZNSt19_Sp_make_shared_tag5_S_eqERKSt9type_info(const type_info*) noexcept {
return false;
}
# endif
} // namespace std
#endif
@ -136,6 +167,22 @@ namespace std {
* depending on optimization level */
template basic_string<char, char_traits<char>, allocator<char>>::basic_string(
const basic_string&, size_t, const allocator<char>&);
# if MOZ_LIBSTDCXX_VERSION >= GLIBCXX_VERSION(3, 4, 26)
template basic_stringstream<char, char_traits<char>,
allocator<char>>::basic_stringstream();
template basic_ostringstream<char, char_traits<char>,
allocator<char>>::basic_ostringstream();
# endif
# if MOZ_LIBSTDCXX_VERSION >= GLIBCXX_VERSION(3, 4, 29)
template void basic_string<char, char_traits<char>, allocator<char>>::reserve();
template void
basic_string<wchar_t, char_traits<wchar_t>, allocator<wchar_t>>::reserve();
# endif
} // namespace std
#endif