NetBSD/earmv6hf spidermonkey,firefox52 failed with bogus ARM_ARCH during autoconf

[ebijun]

firefox-52.9.0esr/build/autoconf/arch.m4

AC_MSG_CHECKING(ARM version support in compiler)
dnl Determine the target ARM architecture (5 for ARMv5, v5T, v5E, etc.; 6 for ARMv6, v6K, etc.)

ARM_ARCH=6

[ebijun]

https://twitter.com/ebijun/status/1081686661069602816

[ebijun]

https://bugzilla.mozilla.org/show_bug.cgi?id=950261
http://mail-index.netbsd.org/port-arm/2019/01/09/msg005374.html

[ebijun]

https://musl.openwall.narkive.com/XpMehLZD/patch-arm-respect-both-arm-arch-6kz-and-arm-arch-6zk-macros
6KZ is the correct form, 6ZK is a gcc specific historical typo.
Respect both for the widest compatibility with clang and older
versions of gcc.

[ebijun]

grep -v 6ZK すればいいのか試す。

[ebijun]

実際にどう使われているのか。6KZになったとして、正しく使われるのか。

[ebijun]

--- ./work.earmv6hf/seamonkey-2.49.4/mozilla/build/autoconf/arch.m4.org 2019-04-05 05:06:20.469148320 +0900
+++ ./work.earmv6hf/seamonkey-2.49.4/mozilla/build/autoconf/arch.m4 2019-04-05 05:06:35.363054191 +0900
@@ -217,7 +217,7 @@

AC_MSG_CHECKING(ARM version support in compiler)
dnl Determine the target ARM architecture (5 for ARMv5, v5T, v5E, etc.; 6 for ARMv6, v6K, etc.)

• ARM_ARCH=${CC-cc} ${CFLAGS} -dM -E - < /dev/null | sed -n 's/.*__ARM_ARCH_\([[0-9]][[0-9]]*\).*/\1/p'

• ARM_ARCH=${CC-cc} ${CFLAGS} -dM -E - < /dev/null | sed -n 's/.*__ARM_ARCH_\([[0-9]][[0-9]]*\).*/\1/p'|grep -v 6ZK
  AC_MSG_RESULT("$ARM_ARCH")

  AC_MSG_CHECKING(for ARM NEON support in compiler)