From b1a016d4b56804d13ce1696acc41525d313a9cbc Mon Sep 17 00:00:00 2001
From: Sam Yates <halfflat@gmail.com>
Date: Mon, 25 Jan 2021 17:31:31 +0100
Subject: [PATCH] Respect CMAKE_INSTALL_PREFIX in python lib path (#1325)
* Respect CMAKE_INSTALL_PREFIX in python lib path
* Set `base` and `platbase` to the CMAKE_INSTALL_PREFIX, if defined,
when asking Python for the default python lib install path.
* Differentiate between explicit and default prefix.
* Test for defaulted CMAKE_INSTALL_PREFIX, in which case, use the system
python site packages path, so that it's overall less excitingly awful in
python virtual environments. If you want /usr/local, set it.
---
python/CMakeLists.txt | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index 744a0d18..8ecc727a 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -81,7 +81,20 @@ file(COPY "${PROJECT_SOURCE_DIR}/VERSION" DESTINATION "${python_mod_path}")
# Set the installation path
# Ask Python where it keeps its system (platform) packages.
-execute_process (COMMAND ${PYTHON_EXECUTABLE} -c "import sysconfig; print(sysconfig.get_path('platlib'))" OUTPUT_VARIABLE ARB_PYTHON_LIB_PATH_DEFAULT OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+ file(WRITE "${CMAKE_BINARY_DIR}/install-prefix" "")
+else()
+ file(WRITE "${CMAKE_BINARY_DIR}/install-prefix" "${CMAKE_INSTALL_PREFIX}")
+endif()
+
+execute_process(
+ COMMAND ${PYTHON_EXECUTABLE} -c
+ "import sys,sysconfig;pfx=sys.stdin.read();print(sysconfig.get_path('platlib',vars={} if pfx=='' else {'base':pfx,'platbase':pfx}))"
+ INPUT_FILE "${CMAKE_BINARY_DIR}/install-prefix"
+ OUTPUT_VARIABLE ARB_PYTHON_LIB_PATH_DEFAULT
+ OUTPUT_STRIP_TRAILING_WHITESPACE)
+
# Default to installing in that path, override with user specified ARB_PYTHON_LIB_PATH
set(ARB_PYTHON_LIB_PATH ${ARB_PYTHON_LIB_PATH_DEFAULT} CACHE PATH "path for installing Python module for Arbor.")
message(STATUS "Python module installation path: ${ARB_PYTHON_LIB_PATH}")
--
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