[Asterisk-code-review] check_expr2: fix cross-compile/hardening issues (asterisk[master])

[Sebastian Kemper]

Hello Sean Bright, Joshua Colp, George Joseph, Friendly Automation, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/13591

to look at the new patch set (#3).

Change subject: check_expr2: fix cross-compile/hardening issues
......................................................................

check_expr2: fix cross-compile/hardening issues

When building check_expr2 with ASLR PIE hardening enabled the linker
fails. This is resolved by adding the regular compiler flags when
building the object files from ast_expr2f.c and ast_expr2.c.

Note: The STANDALONE define is removed because it is already defined in
_ASTCFLAGS. YY_NO_INPUT is defined so that the compile survives
'--enable-dev-mode'.

Also, a Makefile variable "CROSS_COMPILING" is added so that the
build system doesn't try to run check_expr2 when cross-compiling,
because that will fail the build as will.

ASTERISK-28685 #close

Signed-off-by: Sebastian Kemper <sebastian_ml at gmx.net>
Change-Id: If435b7db9f9ad8266245bda51c81c220f9658915
---
M configure
M configure.ac
M makeopts.in
M menuselect/configure
M utils/Makefile
5 files changed, 58 insertions(+), 73 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/91/13591/3
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Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Change-Id: If435b7db9f9ad8266245bda51c81c220f9658915
Gerrit-Change-Number: 13591
Gerrit-PatchSet: 3
Gerrit-Owner: Sebastian Kemper <sebastian_ml at gmx.net>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Reviewer: Sean Bright <sean.bright at gmail.com>
Gerrit-MessageType: newpatchset
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