build: Build pru gcc in travis-ci scripts and then cache it for later use

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

.travis.yml

@@ -4,9 +4,10 @@ language: c
 addons:
   apt:
     packages:
-            - gcc-avr
-            - avr-libc
-            - wget
+      # AVR GCC packages
+      - gcc-avr avr-libc
+      # PRU GCC build packages
+      - pv libmpfr-dev libgmp-dev libmpc-dev texinfo libncurses5-dev bison flex
 
 cache:
   directories:

scripts/travis-install.sh

@@ -7,8 +7,8 @@ set -eux
 
 MAIN_DIR=${PWD}
 BUILD_DIR=${PWD}/travis_build
-DOWNLOAD_DIR=${PWD}/travis_cache
-mkdir -p ${BUILD_DIR} ${DOWNLOAD_DIR}
+CACHE_DIR=${PWD}/travis_cache
+mkdir -p ${BUILD_DIR} ${CACHE_DIR}
 
 
 ######################################################################
@@ -20,7 +20,7 @@ GCC_ARM_URL="https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2017q4/g
 GCC_ARM_SHA="96a029e2ae130a1210eaa69e309ea40463028eab18ba19c1086e4c2dafe69a6a  gcc-arm-none-eabi-7-2017-q4-major-linux.tar.bz2"
 GCC_ARM_FILE="$(basename ${GCC_ARM_URL})"
 
-cd ${DOWNLOAD_DIR}
+cd ${CACHE_DIR}
 if [ ! -f ${GCC_ARM_FILE} ]; then
     wget "$GCC_ARM_URL"
 fi
@@ -30,7 +30,29 @@ if [ "$FOUND_SHA" != "$GCC_ARM_SHA" ]; then
     exit -1
 fi
 cd ${BUILD_DIR}
-tar xf "${DOWNLOAD_DIR}/${GCC_ARM_FILE}"
+tar xf "${CACHE_DIR}/${GCC_ARM_FILE}"
+
+
+######################################################################
+# Install (or build) pru gcc
+######################################################################
+
+PRU_FILE=${CACHE_DIR}/gnupru.tar.gz
+PRU_DIR=${BUILD_DIR}/pru-gcc
+
+if [ ! -f ${PRU_FILE} ]; then
+    cd ${BUILD_DIR}
+    git clone https://github.com/dinuxbg/gnupru -b 2018.03-beta-rc3
+    cd gnupru
+    export PREFIX=${PRU_DIR}
+    ./download-and-patch.sh 2>&1 | pv -nli 30 > ${BUILD_DIR}/gnupru-build.log
+    ./build.sh 2>&1 | pv -nli 30 >> ${BUILD_DIR}/gnupru-build.log
+    cd ${BUILD_DIR}
+    tar cfz ${PRU_FILE} pru-gcc/
+else
+    cd ${BUILD_DIR}
+    tar xfz ${PRU_FILE}
+fi
 
 
 ######################################################################