package/pkg-python.mk: replace $(_BASE_ENV) with $($(SETUP_TYPE)_ENV)

The _BASE_ENV variable is set based on the setup type, and only based on
the setup type. Because of this, we have a large conditional tree in
inner-python-package which makes things hard to read.

Rather than conditions, it's also possible to use indirect variables.
Concretely, we can use $(PKG_PYTHON_$($(PKG)_SETUP_TYPE)_ENV) instead
of $($(PKG)_BASE_ENV) to dispatch to the right ENV variable.

Once we do the same for all other variables that are set in the
condition tree, we'll be able to remove the condition tree entirely.

Because $($(PKG)_SETUP_TYPE) is lowercase (e.g. 'setuptools' or
'pep517'), while the existing _ENV variables have uppercase names (e.g.
PKG_PYTHON_SETUPTOOLS_ENV), we need to convert the setup type to
uppercase. Introduce the variable $(PKG)_SETUP_TYPE_UPPER for this.

flit was reusing the _BASE_ENV definition from pep517, and flit-bootstrap
also didn't have its own _ENV definition yet, so those have to be added.

Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/pkg-python.mk

@@ -158,6 +158,18 @@ HOST_PKG_PYTHON_PEP517_INSTALL_OPTS = \
 HOST_PKG_PYTHON_PEP517_BOOTSTRAP_INSTALL_OPTS = \
 	--installdir=$(HOST_DIR)/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages
 
+# Target flit packages
+PKG_PYTHON_FLIT_ENV = \
+	$(PKG_PYTHON_PEP517_ENV)
+
+# Host flit packages
+HOST_PKG_PYTHON_FLIT_ENV = \
+	$(HOST_PKG_PYTHON_PEP517_ENV)
+
+# Host flit-bootstrap packages
+HOST_PKG_PYTHON_FLIT_BOOTSTRAP_ENV = \
+	$(HOST_PKG_PYTHON_PEP517_ENV)
+
 # Target maturin packages
 PKG_PYTHON_MATURIN_ENV = \
 	$(PKG_PYTHON_PEP517_ENV) \
@@ -194,54 +206,34 @@ ifndef $(2)_SETUP_TYPE
  endif
 endif
 
+$(2)_SETUP_TYPE_UPPER = $$(call UPPERCASE,$$($(2)_SETUP_TYPE))
+
 # Distutils
 ifeq ($$($(2)_SETUP_TYPE),distutils)
 ifeq ($(4),target)
-$(2)_BASE_ENV = $$(PKG_PYTHON_DISTUTILS_ENV)
 $(2)_BASE_BUILD_CMD = setup.py build $$(PKG_PYTHON_DISTUTILS_BUILD_OPTS)
 $(2)_BASE_INSTALL_TARGET_CMD  = setup.py install --no-compile $$(PKG_PYTHON_DISTUTILS_INSTALL_TARGET_OPTS)
 $(2)_BASE_INSTALL_STAGING_CMD = setup.py install $$(PKG_PYTHON_DISTUTILS_INSTALL_STAGING_OPTS)
 else
-$(2)_BASE_ENV         = $$(HOST_PKG_PYTHON_DISTUTILS_ENV)
 $(2)_BASE_BUILD_CMD   = setup.py build
 $(2)_BASE_INSTALL_CMD = setup.py install $$(HOST_PKG_PYTHON_DISTUTILS_INSTALL_OPTS)
 endif
 # Setuptools
 else ifneq ($$(filter setuptools setuptools-rust,$$($(2)_SETUP_TYPE)),)
 ifeq ($(4),target)
-ifeq ($$($(2)_SETUP_TYPE),setuptools-rust)
-$(2)_BASE_ENV = $$(PKG_PYTHON_SETUPTOOLS_RUST_ENV)
-else
-$(2)_BASE_ENV = $$(PKG_PYTHON_SETUPTOOLS_ENV)
-endif
 $(2)_BASE_BUILD_CMD = $$(PKG_PYTHON_SETUPTOOLS_CMD) build
 $(2)_BASE_INSTALL_TARGET_CMD = $$(PKG_PYTHON_SETUPTOOLS_CMD) install --no-compile $$(PKG_PYTHON_SETUPTOOLS_INSTALL_TARGET_OPTS)
 $(2)_BASE_INSTALL_STAGING_CMD = $$(PKG_PYTHON_SETUPTOOLS_CMD) install $$(PKG_PYTHON_SETUPTOOLS_INSTALL_STAGING_OPTS)
 else
-ifeq ($$($(2)_SETUP_TYPE),setuptools-rust)
-$(2)_BASE_ENV = $$(HOST_PKG_PYTHON_SETUPTOOLS_RUST_ENV)
-else
-$(2)_BASE_ENV = $$(HOST_PKG_PYTHON_SETUPTOOLS_ENV)
-endif
 $(2)_BASE_BUILD_CMD = $$(PKG_PYTHON_SETUPTOOLS_CMD) build
 $(2)_BASE_INSTALL_CMD = $$(PKG_PYTHON_SETUPTOOLS_CMD) install $$(HOST_PKG_PYTHON_SETUPTOOLS_INSTALL_OPTS)
 endif
 else ifneq ($$(filter flit maturin pep517,$$($(2)_SETUP_TYPE)),)
 ifeq ($(4),target)
-ifeq ($$($(2)_SETUP_TYPE),maturin)
-$(2)_BASE_ENV = $$(PKG_PYTHON_MATURIN_ENV)
-else
-$(2)_BASE_ENV = $$(PKG_PYTHON_PEP517_ENV)
-endif
 $(2)_BASE_BUILD_CMD = -m build -n -w
 $(2)_BASE_INSTALL_TARGET_CMD = $(TOPDIR)/support/scripts/pyinstaller.py dist/* $$(PKG_PYTHON_PEP517_INSTALL_TARGET_OPTS)
 $(2)_BASE_INSTALL_STAGING_CMD = $(TOPDIR)/support/scripts/pyinstaller.py dist/* $$(PKG_PYTHON_PEP517_INSTALL_STAGING_OPTS)
 else
-ifeq ($$($(2)_SETUP_TYPE),maturin)
-$(2)_BASE_ENV = $$(HOST_PKG_PYTHON_MATURIN_ENV)
-else
-$(2)_BASE_ENV = $$(HOST_PKG_PYTHON_PEP517_ENV)
-endif
 $(2)_BASE_BUILD_CMD = -m build -n -w
 $(2)_BASE_INSTALL_CMD = $(TOPDIR)/support/scripts/pyinstaller.py dist/* $$(HOST_PKG_PYTHON_PEP517_INSTALL_OPTS)
 endif
@@ -249,7 +241,6 @@ else ifeq ($$($(2)_SETUP_TYPE),flit-bootstrap)
 ifeq ($(4),target)
 $$(error flit-bootstrap setup type only supported for host packages)
 else
-$(2)_BASE_ENV = $$(HOST_PKG_PYTHON_PEP517_ENV)
 $(2)_BASE_BUILD_CMD = -m flit_core.wheel
 $(2)_BASE_INSTALL_CMD ?= $(TOPDIR)/support/scripts/pyinstaller.py dist/* $$(HOST_PKG_PYTHON_PEP517_INSTALL_OPTS)
 endif
@@ -332,7 +323,8 @@ ifeq ($(4),target)
 ifndef $(2)_BUILD_CMDS
 define $(2)_BUILD_CMDS
 	(cd $$($$(PKG)_BUILDDIR)/; \
-		$$($$(PKG)_BASE_ENV) $$($$(PKG)_ENV) \
+		$$(PKG_PYTHON_$$($$(PKG)_SETUP_TYPE_UPPER)_ENV) \
+		$$($$(PKG)_ENV) \
 		$$(HOST_DIR)/bin/python3 \
 		$$($$(PKG)_BASE_BUILD_CMD) \
 		$$($$(PKG)_BUILD_OPTS))
@@ -346,7 +338,8 @@ endif
 ifndef $(2)_INSTALL_TARGET_CMDS
 define $(2)_INSTALL_TARGET_CMDS
 	(cd $$($$(PKG)_BUILDDIR)/; \
-		$$($$(PKG)_BASE_ENV) $$($$(PKG)_ENV) \
+		$$(PKG_PYTHON_$$($$(PKG)_SETUP_TYPE_UPPER)_ENV) \
+		$$($$(PKG)_ENV) \
 		$$(HOST_DIR)/bin/python3 \
 		$$($$(PKG)_BASE_INSTALL_TARGET_CMD) \
 		$$($$(PKG)_INSTALL_TARGET_OPTS))
@@ -360,7 +353,8 @@ endif
 ifndef $(2)_INSTALL_STAGING_CMDS
 define $(2)_INSTALL_STAGING_CMDS
 	(cd $$($$(PKG)_BUILDDIR)/; \
-		$$($$(PKG)_BASE_ENV) $$($$(PKG)_ENV) \
+		$$(PKG_PYTHON_$$($$(PKG)_SETUP_TYPE_UPPER)_ENV) \
+		$$($$(PKG)_ENV) \
 		$$(HOST_DIR)/bin/python3 \
 		$$($$(PKG)_BASE_INSTALL_STAGING_CMD) \
 		$$($$(PKG)_INSTALL_STAGING_OPTS))
@@ -376,7 +370,8 @@ else # host
 ifndef $(2)_BUILD_CMDS
 define $(2)_BUILD_CMDS
 	(cd $$($$(PKG)_BUILDDIR)/; \
-		$$($$(PKG)_BASE_ENV) $$($$(PKG)_ENV) \
+		$$(HOST_PKG_PYTHON_$$($$(PKG)_SETUP_TYPE_UPPER)_ENV) \
+		$$($$(PKG)_ENV) \
 		$$(HOST_DIR)/bin/python3 \
 		$$($$(PKG)_BASE_BUILD_CMD) \
 		$$($$(PKG)_BUILD_OPTS))
@@ -390,7 +385,8 @@ endif
 ifndef $(2)_INSTALL_CMDS
 define $(2)_INSTALL_CMDS
 	(cd $$($$(PKG)_BUILDDIR)/; \
-		$$($$(PKG)_BASE_ENV) $$($$(PKG)_ENV) \
+		$$(HOST_PKG_PYTHON_$$($$(PKG)_SETUP_TYPE_UPPER)_ENV) \
+		$$($$(PKG)_ENV) \
 		$$(HOST_DIR)/bin/python3 \
 		$$($$(PKG)_BASE_INSTALL_CMD) \
 		$$($$(PKG)_INSTALL_OPTS))