Set PYTHONHOME in pythonIoc runner

This allows any virtual env to be picked up.

Author: Araneidae

Makefile

@@ -11,6 +11,8 @@ include $(TOP)/configure/RULES_TOP
 # succuessfully import the softioc library.
 SPHINX_BUILD := $(shell readlink -f $$(which sphinx-build))
 
+PYTHONHOME := $(shell $(PYTHON) -c 'import sys; print(sys.exec_prefix)')
+
 BUILD_DOCS ?= 1
 
 install: pythonIoc
@@ -23,7 +25,8 @@ clean: clean-pythonIoc
 # Commands for creating startup script with correct paths to EPICS.
 define SED_EDIT_COMMANDS
 s:@@EPICS_BASE@@:$(EPICS_BASE):; \
-s:@@EPICS_HOST_ARCH@@:$(EPICS_HOST_ARCH):
+s:@@EPICS_HOST_ARCH@@:$(EPICS_HOST_ARCH):; \
+s:@@PYTHONHOME@@:$(PYTHONHOME):
 endef
 
 # Ensure we get the build time EPICS_BASE into the executable

pythonIoc.in

@@ -8,6 +8,7 @@ export HERE="$(readlink -fn "$(dirname "$0")")"
 export PYTHONPATH="$PYTHONPATH${PYTHONPATH:+:}$HERE/python"
 export EPICS_BASE='@@EPICS_BASE@@'
 export EPICS_HOST_ARCH='@@EPICS_HOST_ARCH@@'
+export PYTHONHOME='@@PYTHONHOME@@'
 
 case "$1" in
     --debug)

softIocApp/Makefile

@@ -17,12 +17,10 @@ include $(TOP)/configure/CONFIG
 # surprisingly tricky, as we want to support quite a number of different
 # configurations of Python interpreter.
 PYTHON_LIB := $(shell $(PYTHON) -c \
-    'from __future__ import print_function; \
-    from distutils import sysconfig; \
+    'from distutils import sysconfig; \
     print(sysconfig.get_config_var("LIBRARY")[3:-2])')
 PYTHON_LIB_DIR := $(shell $(PYTHON) -c \
-    'from __future__ import print_function; \
-    from distutils import sysconfig; \
+    'from distutils import sysconfig; \
     print(sysconfig.get_config_var("LIBDIR"))')