This patch fixes following error with U-Boot 2019.01 on imx6:
In file included from tools/lib/crc16.c:1:0:
./tools/../lib/crc16.c: In function 'crc16_ccitt':
./tools/../lib/crc16.c:70:2: error: 'for' loop initial declarations are only allowed in C99 mode
for (int i = 0; i < len; i++)
^
./tools/../lib/crc16.c:70:2: note: use option -std=c99 or -std=gnu99 to compile your code
Code was introduced in the upstream v2019.01-rc1-154-g51c2345:
commit 51c2345bd24837f9f67f16268da6dc71573f1325
Author: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Date: Sun Nov 25 19:22:19 2018 +0100
Roll CRC16-CCITT into the hash infrastructure
Upstream has added -std=gnu11 host flag in v2018.07-rc2-1-gfa89399:
commit fa893990e9b53425af5f5059e04a2bffde91ccf9
Author: Tom Rini <trini@konsulko.com>
Date: Tue Jun 19 23:53:54 2018 -0400
Makefile: Ensure we build with -std=gnu11
Build tested on imx6: apalis, mx6sabresd, nitrogen6dl, nitrogen6dl2g,
nitrogen6q, nitrogen6q2g, nitrogen6s, nitrogen6s1g,
wandboard
Run tested: apalis (pending PR #1595)
Signed-off-by: Petr Štetiar <ynezz@true.cz>
This will make sure that the build system's
paths for linking are available.
This is needed mostly for linking with tools/libressl.
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
This would should up as `$$(HOSTCPPFLAGS)` in the host CFLAGS.
```
make --jobserver-fds=3,4 -j -C <openwrt>/build_dir/target-arm_cortex-a8+vfpv3_musl_eabi/u-boot-A10-OLinuXino-Lime/u-boot-2017.07 CROSS_COMPILE=arm-openwrt-linux-muslgnueabi- DTC="<openwrt>/build_dir/target-arm_cortex-a8+vfpv3_musl_eabi/linux-sunxi_cortexa8/linux-4.9.76/scripts/dtc/dtc" HOSTCC="gcc" HOSTCFLAGS='-O2 -I<openwrt>/staging_dir/host/include -I<openwrt>/staging_dir/host/usr/include -I<openwrt>/staging_dir/hostpkg/include -I<openwrt>/staging_dir/target-arm_cortex-a8+vfpv3_musl_eabi/host/include $$(HOSTCPPFLAGS)' HOSTLDFLAGS="" BL31=<openwrt>/staging_dir/target-arm_cortex-a8+vfpv3_musl_eabi/image/bl31.bin
```
And then it would complain with:
```
/bin/sh: 1: HOSTCPPFLAGS: not found
```
Also, HOSTCPPFLAGS does not exist.
The correct var is HOST_CPPFLAGS.
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
