[PATCH] libstdc++: GNAT exceptions in C++

[Alexandre Oliva]

On Jul 14, 2026, Alexandre Oliva <oliva@adacore.com> wrote:

> This patch introduces __gnu_cxx::__gnat_exception, a class derived
> from abi::__foreign_exception, that can be used to catch GNAT
> exceptions and obtain information from them, such as the exception
> name and message:

Ping?
https://gcc.gnu.org/pipermail/gcc-patches/2026-July/723814.html

> for  libstdc++-v3/ChangeLog

> 	* config/abi/pre/gnu-versioned-namespace.ver (CXXABI_2.0):
> 	Drop duplicates.  Add __gnat_exception symbols.
> 	* config/abi/pre/gnu.ver (CXXABI_1.3.18): New.  Add
> 	__gnat_exception symbols.
> 	* testsuite/util/testsuite_abi.cc: Update known_versions and
> 	latestp.
> 	* libsupc++/Makefile.am (sources): Add gnat_exception.cc.
> 	* libsupc++/Makefile.in: Rebuild.
> 	* libsupc++/cxxabi.h (__gnu_cxx::__gnat_exception): New.
> 	(__cxxabiv1::__foreign_exception): Befriend it.
> 	* libsupc++/eh_personality.cc (PERSONALITY_FUNCTION): Select
> 	__gnat_exception for GNAT exceptions.
> 	* libsupc++/eh_arm.cc (__cxa_type_match): Likewise.
> 	* libsupc++/eh_catch.cc (__cxxabiv1::__cxa_begin_catch):
> 	Return unwindHeader for GNAT exceptions.
> 	* libsupc++/gnat_exception.cc: New.
> 	* libsupc++/unwind-cxx.h (__is_gnat_exception_class): New, for
> 	__ARM_EABI_UNWINDER__ and generic.
> 	(__gnat_exception_class) [!__ARM_EABI_UNWINDER__]: New.


-- 
Alexandre Oliva, happy hacker            https://blog.lx.oliva.nom.br/
Free Software Activist     FSFLA co-founder     GNU Toolchain Engineer
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