[PATCH v3] gawk: disable persistent memory allocator due to licensing

[<Randy.MacLeod@windriver.com>]

From: Randy MacLeod <Randy.MacLeod@windriver.com>

In gawk-5.2, a feature that allows gawk to preserve memory between runs:
   https://www.gnu.org/software/gawk/manual/html_node/Persistent-Memory.html
was added. The files that implement this, support/pma.[ch], are licensed
under the AGPL which some entities perfer to avoid. Force people to knowingly
opt into using this feature and license using:
   PACKAGECONFIG:append:pn-gawk = " pma"
where pma is an abbreviation for persistent memory allocator. Also add AGPL
to LICENSE if using pma.

License-Update: Reflects conditional AGPL use as described above.

Testing requires a non-root account and following the example in the link above:
  $ truncate -s <size> data.pma
  $ chmod 0600 data.pma
  $ GAWK_PERSIST_FILE=data.pma gawk 'BEGIN { print ++i }'
  1
  $ GAWK_PERSIST_FILE=data.pma gawk 'BEGIN { print ++i }'
  2
  $ GAWK_PERSIST_FILE=data.pma gawk 'BEGIN { print ++i }'
  3

This works on qemu[x86-|arm|riscv]64 but not on qemuarm where the
--enable-pma is ignored for unknown reasons.

Finally, remove an old comment about GPLv2, GPLv3 versions of gawk
since this is no longer important as the GPLv2 version is not maintained.

Signed-off-by: Randy MacLeod <Randy.MacLeod@windriver.com>
---
 meta/recipes-extended/gawk/gawk_5.3.2.bb | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/meta/recipes-extended/gawk/gawk_5.3.2.bb b/meta/recipes-extended/gawk/gawk_5.3.2.bb
index 833fe78bf9..b4b7419c34 100644
--- a/meta/recipes-extended/gawk/gawk_5.3.2.bb
+++ b/meta/recipes-extended/gawk/gawk_5.3.2.bb
@@ -6,14 +6,21 @@ HOMEPAGE = "https://www.gnu.org/software/gawk/"
 BUGTRACKER  = "bug-gawk@gnu.org"
 SECTION = "console/utils"
 
-# gawk <= 3.1.5: GPL-2.0-only
-# gawk >= 3.1.6: GPL-3.0-only
 LICENSE = "GPL-3.0-only"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d32239bcb673463ab874e80d47fae504"
 
+# pma adds AGPL license
+LICENSE:append = " ${@bb.utils.contains('PACKAGECONFIG', 'pma', ' & AGPL-3.0-or-later', '', d)}"
+LIC_FILES_CHKSUM:append = " ${@bb.utils.contains('PACKAGECONFIG', 'pma', \
+    'file://support/pma.c;md5=bb0026ee5e8b950e67d670dd2d60cc93;beginline=8;endline=19 \
+     file://support/pma.h;md5=bb0026ee5e8b950e67d670dd2d60cc93;beginline=8;endline=19', '', d) \
+}"
+
 PACKAGECONFIG ??= "readline mpfr"
 PACKAGECONFIG[readline] = "--with-readline,--without-readline,readline"
 PACKAGECONFIG[mpfr] = "--with-mpfr,--without-mpfr, mpfr"
+# pma: persistent memory allocator: off by default due to licensing.
+PACKAGECONFIG[pma] = "--enable-pma,--disable-pma, "
 
 SRC_URI = "${GNU_MIRROR}/gawk/gawk-${PV}.tar.gz \
            file://run-ptest \
-- 
2.34.1