Date: Wed, 18 Jun 2025 13:00:50 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Gleb Popov <arrowd@freebsd.org> Cc: toolchain@freebsd.org Subject: Re: Status of /usr/include/libunwind.h Message-ID: <13A265E4-D0F1-441C-BE42-887122D97975@FreeBSD.org> In-Reply-To: <CALH631noBbYTwb4=C=S8f7OscD5tw9wKCfbnx2NYO%2BTPdfg3Rg@mail.gmail.com>
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On 18 Jun 2025, at 10:50, Gleb Popov <arrowd@freebsd.org> wrote: > > I noticed that we install the /usr/include/libunwind.h file, which can > be picked by ports, but symbols from this header are defined in the > /usr/lib/libgcc_eh.a static library. I find this a bit surprising. > > If this header is intended to be public, then we should have > libunwind.so in base, so that programs can link to it. Otherwise, we > should hide the header and make ports use devel/libunwind or > devel/llvmXY instead. We didn't install it into /usr/include before 2022 [1], but it was located in /usr/include/c++/v1 since 2012 [2], and at that time there was still a HP unwind.h somewhere in the tree. The lib/libgcc_eh and libgcc_s directories were introduced in 2016 [3] and [4], which was a step in bringing in the llvm libunwind implementation, started in [5]. At that time, there was no libunwind in base, as far as I know. However, the actual unwinding functions are in libgcc_s.so.1: $ nm -D -U /lib/libgcc_s.so.1 | grep Unwind 0000000000017400 T _Unwind_Backtrace@@GCC_3.3 00000000000185d0 T _Unwind_DeleteException@@GCC_3.0 0000000000017360 T _Unwind_FindEnclosingFunction@@GCC_3.3 0000000000017570 T _Unwind_Find_FDE@@GCC_3.0 0000000000018440 T _Unwind_ForcedUnwind@@GCC_3.0 0000000000017620 T _Unwind_GetCFA@@GCC_3.3 0000000000017280 T _Unwind_GetDataRelBase@@GCC_3.0 0000000000018630 T _Unwind_GetGR@@GCC_3.0 00000000000186f0 T _Unwind_GetIP@@GCC_3.0 0000000000017680 T _Unwind_GetIPInfo@@GCC_4.2.0 00000000000184d0 T _Unwind_GetLanguageSpecificData@@GCC_3.0 0000000000018560 T _Unwind_GetRegionStart@@GCC_3.0 00000000000172f0 T _Unwind_GetTextRelBase@@GCC_3.0 0000000000017a60 T _Unwind_RaiseException@@GCC_3.0 00000000000180c0 T _Unwind_Resume@@GCC_3.0 00000000000171f0 T _Unwind_Resume_or_Rethrow@@GCC_3.3 0000000000018690 T _Unwind_SetGR@@GCC_3.0 0000000000018750 T _Unwind_SetIP@@GCC_3.0 We could make a symlink called libunwind.so, maybe? -Dimitry [1] https://cgit.freebsd.org/src/commit/?id=c00d345665366a89aaba7244d6f078dc756f4c53 [2] https://cgit.freebsd.org/src/commit/?id=cd38c40872c4d4cda7744045ff4672e89d8bf714 [3] https://cgit.freebsd.org/src/commit/?id=49c5eacbbfd900aeb9f3e571e769d2b1ee48f212 [4] https://cgit.freebsd.org/src/commit/?id=c7fbd7722d7c6640bee5fbf8af3a0b1343eefd8b [5] https://cgit.freebsd.org/src/commit/?id=b80f3546a8da40a0fe47415c8b6e107b21007684home | help
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