ときどきの雑記帖 RE* (新南口)

gawk 5.1

gawk の 5.1 がリリースされていたので、NEWSファイルから 変更点などをピックアップしてみる。

NEWS

   Copyright (C) 2019, 2020 Free Software Foundation, Inc.
   
   Copying and distribution of this file, with or without modification,
   are permitted in any medium without royalty provided the copyright
   notice and this notice are preserved.

Changes from 5.0.1 to 5.1.0

1. The major version of the API is bumped to 3, something that should
   have happened at the 5.0.0 release but didn't.

拡張 (extension) を作ったり使ったりしていない人には関係しないだろうけど、 APIのメジャーバージョンが上がったので注意が必要 (バージョンチェックはロード時にチェックしてたんだっけか？)。

2. A number of memory leak issues have been fixed.

メモリーリークのバグがいくつか(たくさん?)修正された。

3. Infrastructure upgrades: Bison 3.5.4, Texinfo 6.7, Gettext 0.20.1,
   Automake 1.16.2.

4. The indexing in the manual has been thoroughly revised, in particular
   making use of the facilities in Texinfo 6.7.  That version (or newer)
   must be used to format the manual.

5. MSYS2 is now supported out-of-the-box by configure.

out-of-the-box ってなんだっけと思い調べてみると手を入れなくてもそのまま使えるといった ニュアンスの言い回しらしい。

以前からMSYS2用のビルドは問題なくできてなかったっけと思ったがそうか、 by configure がついてるから(以前のように専用のバッチファイルやスクリプト、makafileを 使うのではなくて)、configure && make && make install みたいにできるってことか? (要確認)

6. Several bugs have been fixed.  See the ChangeLog for details.

せっかくなので(短いし)以前のバージョンの分も。 とはいうもののいちいち訳すほどのものでもない?

Changes from 5.0.0 to 5.0.1

1. A number of ChangeLog.1 files that were left out of the distribution
   have been restored.

2. Multiple syntax errors should no longer be able to cause a core dump.

3. Sandbox mode now disallows assigning new filename values in ARGV that
   were not there when gawk was invoked.

4. There are many small documentation improvements in the manual.

5. The new argument "no-ext" to --lint disables ``XXX is a gawk extension''
   lint warnings.

6. Infrastructure upgrades: Bison 3.4.

7. A number of bugs, some of them quite significant, have been fixed.
   See the ChangeLog for details.

5.0.0 の前は 4.2.1。

Changes from 4.2.1 to 5.0.0

1. Support for the POSIX standard %a and %A printf formats has been added.

fprintf から

a, A
A double argument representing a floating-point number shall be converted in the style “[-]0xh.hhhhp±d”, where there is one hexadecimal digit (which shall be non-zero if the argument is a normalized floating-point number and is otherwise unspecified) before the decimal-point character and the number of hexadecimal digits after it is equal to the precision;

要は浮動小数点数の値を十六進表記で出力。C99 のそれ printf - Wikipedia と同じということですかね

2. The test infrastructure has been greatly improved, simplifying the
   contents of test/Makefile.am and making it possible to generate
   pc/Makefile.tst from test/Makefile.in.

3. The regex routines have been replaced with those from GNULIB, allowing
   me to stop carrying forward decades of changes against the original
   ones from GLIBC.

ソースの tar玉を見ても、確かに以前のバージョンには含まれていた正規表現関連のファイルが なくなっていた(ビルド時にどう持ってくるのか要確認。configureでか?)。

4. Infrastructure upgrades: Bison 3.3, Automake 1.16.1, Gettext 0.19.8.1,
   makeinfo 6.5.

5. The undocumented configure option and code that enabled the use of
   non-English "letters" in identifiers is now gone.

今までは使えていたということか ＞ non-English “letters” in identifiers

6. The `--with-whiny-user-strftime' configuration option is now gone.

7. The code now makes some stronger assumptions about a C99 environment.

もうVCでビルドすることもないだろうけど頭の隅にとどめておこう。 もっともVCの側で必要なC99の機能をサポートしている(する)かもしれないけど。

8. PROCINFO["platform"] yields a string indicating the platform for
   which gawk was compiled.

PROCINFO[“platform”] からそのgawkをコンパイルしたプラットフォームの情報がとれる。

9. Writing to elements of SYMTAB that are not variable names now
   causes a fatal error. THIS CHANGES BEHAVIOR.

SYMTABの要素に対する書き込みはできなくなった。

10. Comment handling in the pretty-printer has been reworked almost completely
    from scratch. As a result, comments in many corner cases that were
    previously lost are now included in the formatted output.

11. Namespaces have been implemented! See the manual.  One consequence of this
    is that files included with -i, read with -f, and command line program
    segments must all be self-contained syntactic units. E.g., you can no
    longer do something like this:

   	gawk -e 'BEGIN {' -e 'print "hello" }'

名前空間が実装された。と。 今までは gawk -e ‘BEGIN {’ -e ‘print “hello” }’ なんて書けてたんだねえ。

12. Gawk now uses the locale settings for ignoring case in single byte
    locales, instead of hardwiring in Latin-1.

single byte locale で大小文字を無視するときに これまでは問答無用で Latin-1 であるかのようにしていたけど locale の設定を見るようにしましたよ。と。 マルチバイト文化圏のユーザーにはあまり関係ない?

13. A number of bugs, some of them quite significant, have been fixed.
    See the ChangeLog for details.
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