Travis: Work around 4MB log limit when building all examples

utils/travis_build/install_esptool2.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -uv
+
+# Called by Travis to install esptool2 to generate OTA-compatible build
+# images
+
+if test -f ${ESPTOOL2_DIR}/esptool2; then
+	echo "Using cached esptool2"
+	exit 0
+fi
+
+git clone https://github.com/raburton/esptool2 ${ESPTOOL2_DIR}
+cd ${ESPTOOL2_DIR}
+git reset --hard ${ESPTOOL2_COMMIT}
+make

utils/travis_build/install_toolchain.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+set -euv
+
+# Called by Travis to install a toolchain using esp-open-sdk (parts we
+# ne for esp-open-rtos are the GNU toolchain, libhal, and esptool.py.)
+
+if test -d ${CROSS_BINDIR}; then
+	echo "Using cached toolchain in ${CROSS_BINDIR}"
+	exit 0
+fi
+
+# Travis sets this due to "language: c", but it confuses autotools configure when cross-building
+unset CC
+
+git clone --recursive https://github.com/pfalcon/esp-open-sdk.git
+cd esp-open-sdk
+git reset --hard ${OPENSDK_COMMIT}
+git submodule update --init
+
+# this is a nasty hack as Ubuntu Precise only has autoconf 2.68 not 2.69...
+sed -i "s/2.69/2.68/" lx106-hal/configure.ac
+
+# build the toolchain relative to the CROSS_ROOT directory
+sed -r -i 's%TOOLCHAIN ?=.*%TOOLCHAIN=${CROSS_ROOT}%' Makefile
+
+# will dump log on failure
+echo "Building toolchain without live progress, as progress spinner fills up log..."
+
+if !( make toolchain esptool libhal STANDALONE=n 2>&1 > make.log ); then
+	cat make.log
+	echo "Exiting due to failed toolchain build"
+	exit 3
+fi
+
+echo "Toolchain build completed in ${CROSS_ROOT}."