git: fdc4a7c8012b - main - contrib/bc upgrade to version 7.1.0

From: Stefan Eßer <se_at_FreeBSD.org>
Date: Thu, 11 Sep 2025 14:26:27 UTC
The branch main has been updated by se:

URL: https://cgit.FreeBSD.org/src/commit/?id=fdc4a7c8012b214986cfa2e2fb6d99731f004b1b

commit fdc4a7c8012b214986cfa2e2fb6d99731f004b1b
Merge: 1d6b6ea2d0e6 682da5a0fdb2
Author:     Stefan Eßer <se@FreeBSD.org>
AuthorDate: 2025-09-11 14:16:39 +0000
Commit:     Stefan Eßer <se@FreeBSD.org>
CommitDate: 2025-09-11 14:16:39 +0000

    contrib/bc upgrade to version 7.1.0
    
    This update fixes a few bugs:
    - Improper response to double SIGINT with editline.
    - Not letting libedit handle terminal size changes.
    - A dc crash from improperly handling an error.
    - A duplicate check for reference arrays.
    - Build failures with GCC 15.
    
    Merge commit '682da5a0fdb2c38ecc3951047a882471d62aa1d1'

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@@@ -1,518 -1,0 +1,531 @@@
 +# `bc`
 +
- ***WARNING: New user registration for <https://git.gavinhoward.com/> is disabled
- because of spam. If you need to report a bug with `bc`, email gavin at this site
- minus the `git.` part for an account, and I will create one for you. Or you can
- report an issue at [GitHub][29].***
++***WARNING: This project has moved back to GitHub temporarily; self-hosted Git
++forges are not working for me, so I am trying to replace them.***
 +
 +***WARNING: This project has moved to [https://git.gavinhoward.com/][20] for
 +[these reasons][21], though GitHub will remain a mirror.***
 +
 +This is an implementation of the [POSIX `bc` calculator][12] that implements
 +[GNU `bc`][1] extensions, as well as the period (`.`) extension for the BSD
 +flavor of `bc`.
 +
 +For more information, see this `bc`'s full manual.
 +
 +This `bc` also includes an implementation of `dc` in the same binary, accessible
 +via a symbolic link, which implements all FreeBSD and GNU extensions. (If a
 +standalone `dc` binary is desired, `bc` can be copied and renamed to `dc`.) The
 +`!` command is omitted; I believe this poses security concerns and that such
 +functionality is unnecessary.
 +
 +For more information, see the `dc`'s full manual.
 +
 +This `bc` also provides `bc`'s math as a library with C bindings, called `bcl`.
 +
 +For more information, see the full manual for `bcl`.
 +
 +## License
 +
 +This `bc` is Free and Open Source Software (FOSS). It is offered under the BSD
 +2-clause License. Full license text may be found in the [`LICENSE.md`][4] file.
 +
 +## Prerequisites
 +
 +This `bc` only requires either:
 +
 +1.	Windows 10 or later, or
 +2.	A C99-compatible compiler and a (mostly) POSIX 2008-compatible system with
 +	the XSI (X/Open System Interfaces) option group.
 +
 +Since POSIX 2008 with XSI requires the existence of a C99 compiler as `c99`, any
 +POSIX and XSI-compatible system will have everything needed.
 +
 +POSIX-compatible systems that are known to work:
 +
 +* Linux
 +* FreeBSD
 +* OpenBSD
 +* NetBSD
 +* macOS
 +* Solaris* (as long as the Solaris version supports POSIX 2008)
 +* AIX
 +* HP-UX* (except for history)
 +
 +In addition, there is compatibility code to make this `bc` work on Windows.
 +
 +Please submit bug reports if this `bc` does not build out of the box on any
 +system.
 +
 +## Build
 +
 +This `bc` should build unmodified on any POSIX-compliant system or on Windows
 +starting with Windows 10 (though earlier versions may work).
 +
 +For more complex build requirements than the ones below, see the [build
 +manual][5].
 +
 +### Windows
 +
 +There is no guarantee that this `bc` will work on any version of Windows earlier
 +than Windows 10 (I cannot test on earlier versions), but it is guaranteed to
 +work on Windows 10 at least.
 +
 +Also, if building with MSBuild, the MSBuild bundled with Visual Studio is
 +required.
 +
 +**Note**: Unlike the POSIX-compatible platforms, only one build configuration is
 +supported on Windows: extra math and history enabled, NLS (locale support)
 +disabled, with both calculators built.
 +
 +#### `bc`
 +
 +To build `bc`, you can open the `vs/bc.sln` file in Visual Studio, select the
 +configuration, and build.
 +
 +You can also build using MSBuild with the following from the root directory:
 +
 +```
 +msbuild -property:Configuration=<config> vs/bc.sln
 +```
 +
 +where `<config>` is either one of `Debug` or `Release`.
 +
 +On Windows, the calculators are built as `vs/bin/<platform>/<config>/bc.exe` and
 +`vs/bin/<Platform>/<Config>/dc.exe`, where `<platform>` can be either `Win32` or
 +`x64`, and `<config>` can be `Debug` or `Release`.
 +
 +**Note**: On Windows, `dc.exe` is just copied from `bc.exe`; it is not linked.
 +Patches are welcome for a way to do that.
 +
 +#### `bcl` (Library)
 +
 +To build the library, you can open the `vs/bcl.sln` file in Visual Studio,
 +select the configuration, and build.
 +
 +You can also build using MSBuild with the following from the root directory:
 +
 +```
 +msbuild -property:Configuration=<config> vs/bcl.sln
 +```
 +
 +where `<config>` is either one of `Debug`, `ReleaseMD`, or `ReleaseMT`.
 +
 +On Windows, the library is built as `vs/lib/<platform>/<config>/bcl.lib`, where
 +`<platform>` can be either `Win32` or `x64`, and `<config>` can be `Debug`,
 +`ReleaseMD`, or `ReleaseMT`.
 +
 +### POSIX-Compatible Systems
 +
 +On POSIX-compatible systems, `bc` is built as `bin/bc` and `dc` is built as
 +`bin/dc` by default.
 +
 +#### Default
 +
 +For the default build with optimization, use the following commands in the root
 +directory:
 +
 +```
 +./configure.sh -O3
 +make
 +```
 +
 +#### One Calculator
 +
 +To only build `bc`, use the following commands:
 +
 +```
 +./configure.sh --disable-dc
 +make
 +```
 +
 +To only build `dc`, use the following commands:
 +
 +```
 +./configure.sh --disable-bc
 +make
 +```
 +
 +#### Debug
 +
 +For debug builds, use the following commands in the root directory:
 +
 +```
 +./configure.sh -g
 +make
 +```
 +
 +#### Install
 +
 +To install, use the following command:
 +
 +```
 +make install
 +```
 +
 +By default, `bc` and `dc` will be installed in `/usr/local`. For installing in
 +other locations, use the `PREFIX` environment variable when running
 +`configure.sh` or pass the `--prefix=<prefix>` option to `configure.sh`. See the
 +[build manual][5], or run `./configure.sh --help`, for more details.
 +
 +#### Library
 +
 +To build the math library, pass the `-a` or `--library` options to
 +`configure.sh`:
 +
 +```
 +./configure.sh -a
 +```
 +
 +When building the library, the executables are not built. For more information,
 +see the [build manual][5].
 +
 +The library API can be found in [`manuals/bcl.3.md`][26] or `man bcl` once the
 +library is installed.
 +
 +#### Package and Distro Maintainers
 +
 +This section is for package and distro maintainers.
 +
 +##### Out-of-Source Builds
 +
 +Out-of-source builds are supported; just call `configure.sh` from the directory
 +where the actual build will happen.
 +
 +For example, if the source is in `bc`, the build should happen in `build`, then
 +call `configure.sh` and `make` like so:
 +
 +```
 +../bc/configure.sh
 +make
 +```
 +
 +***WARNING***: The path to `configure.sh` from the build directory must not have
 +spaces because `make` does not support target names with spaces.
 +
 +##### Recommended Compiler
 +
 +When I ran benchmarks with my `bc` compiled under `clang`, it performed much
 +better than when compiled under `gcc`. I recommend compiling this `bc` with
 +`clang`.
 +
 +I also recommend building this `bc` with C11 if you can because `bc` will detect
 +a C11 compiler and add `_Noreturn` to any relevant function(s).
 +
 +##### Recommended Optimizations
 +
 +I wrote this `bc` with Separation of Concerns, which means that there are many
 +small functions that could be inlined. However, they are often called across
 +file boundaries, and the default optimizer can only look at the current file,
 +which means that they are not inlined.
 +
 +Thus, because of the way this `bc` is built, it will automatically be slower
 +than other `bc` implementations when running scripts with no math. (My `bc`'s
 +math is *much* faster, so any non-trivial script should run faster in my `bc`.)
 +
 +Some, or all, of the difference can be made up with the right optimizations. The
 +optimizations I recommend are:
 +
 +1.	`-O3`
 +2.	`-flto` (link-time optimization)
 +
 +in that order.
 +
 +Link-time optimization, in particular, speeds up the `bc` a lot. This is because
 +when link-time optimization is turned on, the optimizer can look across files
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