* [committed] libstdc++: Ensure __glibcxx_assert_fail has default visibility
@ 2022-03-05 20:34 Jonathan Wakely
2022-03-07 15:14 ` Jonathan Wakely
0 siblings, 1 reply; 2+ messages in thread
From: Jonathan Wakely @ 2022-03-05 20:34 UTC (permalink / raw)
To: libstdc++, gcc-patches
Tested powerpc64le-linux, pushed to trunk.
-- >8 --
This ensures there's no linker error if libstdc++ headers are included
following a pragma that sets hidden visibility.
Similarly for std::__terminate, which is always-inline so shouldn't
matter, but it's not wrong to do this anyway.
libstdc++-v3/ChangeLog:
* include/bits/c++config (__glibcxx_assert_fail): Add visibility
attribute.
(__terminate): Likewise.
---
libstdc++-v3/include/bits/c++config | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index c64b61b3c90..6c134f13509 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -305,6 +305,7 @@ namespace std
// This allows the library to terminate without including all of <exception>
// and without making the declaration of std::terminate visible to users.
extern "C++" __attribute__ ((__noreturn__, __always_inline__))
+ _GLIBCXX_VISIBILITY(default)
inline void __terminate() _GLIBCXX_USE_NOEXCEPT
{
void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__));
@@ -554,7 +555,7 @@ namespace std
{
// Avoid the use of assert, because we're trying to keep the <cassert>
// include out of the mix.
- extern "C++" _GLIBCXX_NORETURN
+ extern "C++" _GLIBCXX_NORETURN _GLIBCXX_VISIBILITY(default)
void
__glibcxx_assert_fail(const char* __file, int __line,
const char* __function, const char* __condition)
--
2.34.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [committed] libstdc++: Ensure __glibcxx_assert_fail has default visibility
2022-03-05 20:34 [committed] libstdc++: Ensure __glibcxx_assert_fail has default visibility Jonathan Wakely
@ 2022-03-07 15:14 ` Jonathan Wakely
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Wakely @ 2022-03-07 15:14 UTC (permalink / raw)
To: Jonathan Wakely; +Cc: libstdc++, gcc Patches
[-- Attachment #1: Type: text/plain, Size: 637 bytes --]
On Sat, 5 Mar 2022 at 20:34, Jonathan Wakely via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> Tested powerpc64le-linux, pushed to trunk.
>
> -- >8 --
>
> This ensures there's no linker error if libstdc++ headers are included
> following a pragma that sets hidden visibility.
>
> Similarly for std::__terminate, which is always-inline so shouldn't
> matter, but it's not wrong to do this anyway.
>
> libstdc++-v3/ChangeLog:
>
> * include/bits/c++config (__glibcxx_assert_fail): Add visibility
> attribute.
> (__terminate): Likewise.
This broke mingw targets. Fixed like so.
Tested x86_64-linux, pushed to trunk.
[-- Attachment #2: patch.txt --]
[-- Type: text/plain, Size: 2575 bytes --]
commit 4cb935cb69f12088975fa7f6907c6ace0580e2dd
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Mon Mar 7 15:07:05 2022
libstdc++: Use visibility pragmas instead of attributes [PR104807]
The _GLIBCXX_PSEUDO_VISIBILITY macro isn't defined until after including
os_defines.h, so we can't use _GLIBCXX_VISIBILITY early in c++config.
Replace the uses of that macro with #pragma visibility push(default)
instead.
libstdc++-v3/ChangeLog:
PR libstdc++/104807
* include/bits/c++config (__terminate, __glibcxx_assert_fail):
Replace _GLIBCXX_VISIBILITY on function with visibility pragma.
(__is_constant_evaluated): Add visibility pragma.
diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index 6c134f13509..2798b9786dc 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -302,15 +302,16 @@ namespace std
typedef decltype(nullptr) nullptr_t;
#endif
+#pragma GCC visibility push(default)
// This allows the library to terminate without including all of <exception>
// and without making the declaration of std::terminate visible to users.
extern "C++" __attribute__ ((__noreturn__, __always_inline__))
- _GLIBCXX_VISIBILITY(default)
inline void __terminate() _GLIBCXX_USE_NOEXCEPT
{
void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__));
terminate();
}
+#pragma GCC visibility pop
}
#define _GLIBCXX_USE_DUAL_ABI
@@ -506,6 +507,7 @@ namespace std
namespace std
{
+#pragma GCC visibility push(default)
// Internal version of std::is_constant_evaluated().
// This can be used without checking if the compiler supports the feature.
// The macro _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED can be used to check if
@@ -523,6 +525,7 @@ namespace std
return false;
#endif
}
+#pragma GCC visibility pop
}
// Debug Mode implies checking assertions.
@@ -553,13 +556,15 @@ namespace std
# ifdef _GLIBCXX_VERBOSE_ASSERT
namespace std
{
+#pragma GCC visibility push(default)
// Avoid the use of assert, because we're trying to keep the <cassert>
// include out of the mix.
- extern "C++" _GLIBCXX_NORETURN _GLIBCXX_VISIBILITY(default)
+ extern "C++" _GLIBCXX_NORETURN
void
__glibcxx_assert_fail(const char* __file, int __line,
const char* __function, const char* __condition)
_GLIBCXX_NOEXCEPT;
+#pragma GCC visibility pop
}
#define __glibcxx_assert_impl(_Condition) \
if (__builtin_expect(!bool(_Condition), false)) \
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