Remove --buildbase code

src/.gitignore

@@ -1,4 +1,3 @@
 /.cython_version
 /build
 /Makefile
-/build-sagelib

src/Makefile.in

@@ -15,8 +15,10 @@ all: sage
 
 ## We poison all environment variables that have paths to the sage source and build directories,
 ## but keep the directories below SAGE_LOCAL intact.
-## In this way we make sure that all of the sagelib build's source/build paths are communicated through
-## the current directory (for the source tree) and --build-base.
+## In this way we make sure that all of the sagelib build's source paths are communicated through
+## the current directory (for the source tree).
+## Building takes places in the build/ subdirectory.
+## The environment variable SAGE_CYTHONIZED needs to point to build/cythonized.
 ##
 ## As a special exception, we feed SAGE_PKGS.  This is needed by src/sage_setup/optional_extension.py
 ## via src/sage/misc/package.py.  Hoping that #20382 will make this unnecessary.
@@ -36,14 +38,14 @@ sage:
 		   SAGE_DOC_SRC=/doesnotexist							\
 		   SAGE_SCRIPTS_DIR=/doesnotexist						\
 		   SAGE_BUILD_DIR=/doesnotexist							\
-		   SAGE_CYTHONIZED=/doesnotexist						\
 		   SAGE_PKGS=$(abs_top_srcdir)/build/pkgs					\
-	 && python -u setup.py build --build-base=$(abs_builddir)/build-sagelib install)
+		   SAGE_CYTHONIZED=$(abs_builddir)/build/cythonized				\
+	 && python -u setup.py build install)
 
 clean:
 	@echo "Deleting Sage library build artifacts..."
-	rm -rf c_lib build .cython_version # from old sage versions
-	rm -rf build-sagelib
+	rm -rf c_lib .cython_version # from old sage versions
+	rm -rf build
 	find . -name '*.pyc' | xargs rm -f
 	rm -f sage/libs/pari/auto_*
 	rm -rf sage/ext/interpreters

src/sage/env.py

@@ -106,8 +106,7 @@ def _add_variable_or_fallback(key, fallback, force=False):
 
 _add_variable_or_fallback('SAGE_LIB',        SITE_PACKAGES[0])
 
-# SAGE_CYTHONIZED is only (to be) used in doctests of sage_setup/
-_add_variable_or_fallback('SAGE_CYTHONIZED', opj('$SAGE_ROOT', 'src', 'build-sagelib', 'cythonized'))
+_add_variable_or_fallback('SAGE_CYTHONIZED', opj('$SAGE_ROOT', 'src', 'build', 'cythonized'))
 
 # Used by sage/misc/package.py.  Should be SAGE_SRC_ROOT in VPATH.
 _add_variable_or_fallback('SAGE_PKGS', opj('$SAGE_ROOT', 'build', 'pkgs'))

src/setup.py

@@ -40,22 +40,15 @@ def excepthook(*exc):
 ### Check build-base
 #########################################################
 
-build_base = 'build' # the distutils default
-cmd = None
-for i, arg in enumerate(sys.argv[1:]):
-    if not arg or not arg.startswith("-"):
-        cmd = arg
-    elif cmd == 'build' and (arg.startswith("--build-base") or arg == '-b'):
-        if arg.startswith("--build-base="):
-            build_base = arg[len("--build-base="):]
-        else:
-            build_base = arg[i+1]
+build_base = 'build' # the distutils default. Changing it is not supported by this setup.sh.
+
+#########################################################
+### Set source directory
+#########################################################
 
 import sage.env
-sage.env.SAGE_CYTHONIZED = os.path.abspath(os.path.join(build_base, 'cythonized'))
 sage.env.SAGE_SRC = os.getcwd()
 
-
 #########################################################
 ### List of Extensions
 ###