Added scripts to build/use a local copy of sdcc version 4.2.0.

.gitignore

@@ -23,3 +23,5 @@
 *.bin
 *.lk
 *.o
+sdcc/sdcc
+

README.md

@@ -61,7 +61,7 @@ After programming the ESP32, make sure to also program the filesystem. This will
 ## Hints and excuses:
 - There is no warranty whatsoever. Nothing. Not implied or otherwise suggested. This code isn't fit for anything. Please don't use this code to do nasty things.
 - Do a ```make clean``` between building for different boards. It really helps!
-- This repo builds on SDCC 4.2.0 for Linux. Different SDCC versions can behave VERY differently.
+- This repo builds on SDCC 4.2.0 for Linux. Different SDCC versions can behave VERY differently.  Source sdcc/setup.sh to setup build a local copy and use it for compiling.
 - We are happy and honored to see your pull requests! But please, no code/indent style changes :)
 
 ## Credits

sdcc/build_sdcc.sh

@@ -0,0 +1,34 @@
+#/bin/sh
+# build local version of sdcc 4.2.0 from source
+
+SDCC_VER=4.2.0
+
+if [ ! -e sdcc ]; then
+   git clone https://github.com/swegener/sdcc.git
+   if [ $? -ne 0 ]; then
+      echo "Couldn't clone https://github.com/swegener/sdcc.git"
+      exit 1
+   fi
+fi
+cd sdcc
+git tag 4.2.0 56dc646f8ba6d37c039c5e0c3e60b1340da65b9f
+git checkout ${SDCC_VER}
+if [ $? -ne 0 ]; then
+  echo "Couldn't checkout ${SDCC_VER} source from git"
+  exit 1
+fi
+
+./configure --prefix=`pwd`/${SDCC_VER} --disable-z80-port --disable-z180-port --disable-r2k-port --disable-r2ka-port --disable-r3ka-port --disable-sm83-port --disable-tlcs90-port --disable-ez80_z80-port --disable-z80n-port --disable-ds390-port --disable-ds400-port --disable-pic14-port --disable-pic16-port --disable-hc08-port --disable-s08-port --disable-stm8-port --disable-pdk13-port --disable-pdk14-port --disable-pdk15-port --disable-pdk16-port --disable-mos6502-port --disable-mos65c02-port 2>&1 | tee build.log
+make -j8  2>&1 | tee -a build.log
+if [ $? -ne 0 ]; then
+  echo "sdcc make failed see ./sdcc/build.log for details"
+  exit 1
+fi
+
+make -j8  install 2>&1 | tee -a build.log
+if [ $? -ne 0 ]; then
+  echo "sdcc make install failed see ./sdcc/build.log for details"
+  exit 1
+fi
+
+

sdcc/setup.sh

@@ -0,0 +1,26 @@
+#/bin/sh
+# set environment variables to use locally built sdcc version 4.2.0
+
+#set -x
+SDCC_VER=4.2.0
+
+if [ "${BASH_SOURCE[0]}" -ef "$0" ]; then
+   echo "This script must be SOURCED, not run directly (source $0)."
+   exit 1
+fi
+
+SDCC_DIR=`dirname ${BASH_SOURCE[0]}`
+
+if [ ! -e ${SDCC_DIR}/sdcc/${SDCC_VER} ]; then
+    (cd ${SDCC_DIR};./build_sdcc.sh)
+fi
+
+export CC=sdcc
+SDCC_PATH=${SDCC_DIR}/sdcc/${SDCC_VER}/bin
+echo $PATH | grep ${SDCC_PATH} > /dev/null
+if [ $? -ne 0 ]; then
+   export SDCC_PATH_SAVE=$PATH
+   export PATH=${SDCC_PATH}:$PATH
+   echo "Added ${SDCC_PATH} to PATH"
+fi
+

sdcc/unset.sh

@@ -0,0 +1,19 @@
+#/bin/sh
+# set environment variables to use locally built sdcc version 4.2.0
+
+#set -x
+SDCC_VER=4.2.0
+if [ "${BASH_SOURCE[0]}" -ef "$0" ]; then
+   echo "This script must be SOURCED, not run directly (source $0)."
+   exit 1
+fi
+
+SDCC_DIR=`dirname ${BASH_SOURCE[0]}`
+SDCC_PATH=${SDCC_DIR}/sdcc/${SDCC_VER}/bin
+echo $PATH | grep ${SDCC_PATH} > /dev/null
+if [ ! "${SDCC_PATH_SAVE}x" = "x" ]; then
+   export PATH=${SDCC_PATH_SAVE}
+   export SDCC_PATH_SAVE=
+   export CC=
+fi
+