bpo-43103: Add configure --without-static-libpython (GH-24418)

Add a new configure --without-static-libpython option to not build
the libpythonMAJOR.MINOR.a static library and not install the
python.o object file.

Fix smelly.py and stable_abi.py tools when libpython3.10.a is
missing.

7 files changed, 113 insertions, 25 deletions

diff --git a/Doc/whatsnew/3.10.rst b/Doc/whatsnew/3.10.rst
index c282edc..0fba27c 100644
--- a/Doc/whatsnew/3.10.rst
+++ b/Doc/whatsnew/3.10.rst
@@ -820,6 +820,12 @@ Build Changes
 
   (Contributed by Victor Stinner in :issue:`42856`.)
 
+* Add a new configure ``--without-static-libpython`` option to not build the
+  ``libpythonMAJOR.MINOR.a`` static library and not install the ``python.o``
+  object file.
+
+  (Contributed by Victor Stinner in :issue:`43103`.)
+
 
 C API Changes
 =============
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 0d9fdc7..d3ac2da 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -236,6 +236,9 @@ PY3LIBRARY=     @PY3LIBRARY@
 DLLLIBRARY=	@DLLLIBRARY@
 LDLIBRARYDIR=   @LDLIBRARYDIR@
 INSTSONAME=	@INSTSONAME@
+LIBRARY_DEPS=	@LIBRARY_DEPS@
+PY_ENABLE_SHARED=	@PY_ENABLE_SHARED@
+STATIC_LIBPYTHON=	@STATIC_LIBPYTHON@
 
 
 LIBS=		@LIBS@
@@ -578,7 +581,7 @@ clinic: check-clean-src $(srcdir)/Modules/_blake2/blake2s_impl.c
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/clinic/clinic.py --make --srcdir $(srcdir)
 
 # Build the interpreter
-$(BUILDPYTHON):	Programs/python.o $(LIBRARY) $(LDLIBRARY) $(PY3LIBRARY) $(EXPORTSYMS)
+$(BUILDPYTHON):	Programs/python.o $(LIBRARY_DEPS)
 	$(LINKCC) $(PY_CORE_LDFLAGS) $(LINKFORSHARED) -o $@ Programs/python.o $(BLDLIBRARY) $(LIBS) $(MODLIBS) $(SYSLIBS)
 
 platform: $(BUILDPYTHON) pybuilddir.txt
@@ -713,7 +716,7 @@ Makefile Modules/config.c: Makefile.pre \
 	@echo "The Makefile was updated, you may need to re-run make."
 
 
-Programs/_testembed: Programs/_testembed.o $(LIBRARY) $(LDLIBRARY) $(PY3LIBRARY) $(EXPORTSYMS)
+Programs/_testembed: Programs/_testembed.o $(LIBRARY_DEPS)
 	$(LINKCC) $(PY_CORE_LDFLAGS) $(LINKFORSHARED) -o $@ Programs/_testembed.o $(BLDLIBRARY) $(LIBS) $(MODLIBS) $(SYSLIBS)
 
 ############################################################################
@@ -1305,19 +1308,21 @@ altbininstall: $(BUILDPYTHON) @FRAMEWORKPYTHONW@
 		fi; \
 		(cd $(DESTDIR)$(BINDIR); $(LN) python$(LDVERSION)$(EXE) python$(VERSION)$(EXE)); \
 	fi
-	if test -f $(LDLIBRARY) && test "$(PYTHONFRAMEWORKDIR)" = "no-framework" ; then \
-		if test -n "$(DLLLIBRARY)" ; then \
-			$(INSTALL_SHARED) $(DLLLIBRARY) $(DESTDIR)$(BINDIR); \
-		else \
-			$(INSTALL_SHARED) $(LDLIBRARY) $(DESTDIR)$(LIBDIR)/$(INSTSONAME); \
-			if test $(LDLIBRARY) != $(INSTSONAME); then \
-				(cd $(DESTDIR)$(LIBDIR); $(LN) -sf $(INSTSONAME) $(LDLIBRARY)) \
-			fi \
-		fi; \
-		if test -n "$(PY3LIBRARY)"; then \
-			$(INSTALL_SHARED) $(PY3LIBRARY) $(DESTDIR)$(LIBDIR)/$(PY3LIBRARY); \
+	@if test "$(PY_ENABLE_SHARED)" = 1 -o "$(STATIC_LIBPYTHON)" = 1; then \
+		if test -f $(LDLIBRARY) && test "$(PYTHONFRAMEWORKDIR)" = "no-framework" ; then \
+			if test -n "$(DLLLIBRARY)" ; then \
+				$(INSTALL_SHARED) $(DLLLIBRARY) $(DESTDIR)$(BINDIR); \
+			else \
+				$(INSTALL_SHARED) $(LDLIBRARY) $(DESTDIR)$(LIBDIR)/$(INSTSONAME); \
+				if test $(LDLIBRARY) != $(INSTSONAME); then \
+					(cd $(DESTDIR)$(LIBDIR); $(LN) -sf $(INSTSONAME) $(LDLIBRARY)) \
+				fi \
+			fi; \
+			if test -n "$(PY3LIBRARY)"; then \
+				$(INSTALL_SHARED) $(PY3LIBRARY) $(DESTDIR)$(LIBDIR)/$(PY3LIBRARY); \
+			fi; \
+		else	true; \
 		fi; \
-	else	true; \
 	fi
 	if test "x$(LIPO_32BIT_FLAGS)" != "x" ; then \
 		rm -f $(DESTDIR)$(BINDIR)python$(VERSION)-32$(EXE); \
@@ -1661,19 +1666,21 @@ libainstall:	@DEF_MAKE_RULE@ python-config
 		else	true; \
 		fi; \
 	done
-	@if test -d $(LIBRARY); then :; else \
-		if test "$(PYTHONFRAMEWORKDIR)" = no-framework; then \
-			if test "$(SHLIB_SUFFIX)" = .dll; then \
-				$(INSTALL_DATA) $(LDLIBRARY) $(DESTDIR)$(LIBPL) ; \
+	@if test "$(STATIC_LIBPYTHON)" = 1; then \
+		if test -d $(LIBRARY); then :; else \
+			if test "$(PYTHONFRAMEWORKDIR)" = no-framework; then \
+				if test "$(SHLIB_SUFFIX)" = .dll; then \
+					$(INSTALL_DATA) $(LDLIBRARY) $(DESTDIR)$(LIBPL) ; \
+				else \
+					$(INSTALL_DATA) $(LIBRARY) $(DESTDIR)$(LIBPL)/$(LIBRARY) ; \
+				fi; \
 			else \
-				$(INSTALL_DATA) $(LIBRARY) $(DESTDIR)$(LIBPL)/$(LIBRARY) ; \
+				echo Skip install of $(LIBRARY) - use make frameworkinstall; \
 			fi; \
-		else \
-			echo Skip install of $(LIBRARY) - use make frameworkinstall; \
 		fi; \
+		$(INSTALL_DATA) Programs/python.o $(DESTDIR)$(LIBPL)/python.o; \
 	fi
 	$(INSTALL_DATA) Modules/config.c $(DESTDIR)$(LIBPL)/config.c
-	$(INSTALL_DATA) Programs/python.o $(DESTDIR)$(LIBPL)/python.o
 	$(INSTALL_DATA) $(srcdir)/Modules/config.c.in $(DESTDIR)$(LIBPL)/config.c.in
 	$(INSTALL_DATA) Makefile $(DESTDIR)$(LIBPL)/Makefile
 	$(INSTALL_DATA) $(srcdir)/Modules/Setup $(DESTDIR)$(LIBPL)/Setup
diff --git a/Misc/NEWS.d/next/Build/2021-02-02-16-26-44.bpo-43103.VWeyP_.rst b/Misc/NEWS.d/next/Build/2021-02-02-16-26-44.bpo-43103.VWeyP_.rst
new file mode 100644
index 0000000..edf04c1
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2021-02-02-16-26-44.bpo-43103.VWeyP_.rst
@@ -0,0 +1,3 @@
+Add a new configure ``--without-static-libpython`` option to not build the
+``libpythonMAJOR.MINOR.a`` static library and not install the ``python.o``
+object file.
diff --git a/Tools/scripts/smelly.py b/Tools/scripts/smelly.py
index e8a375c..fb01660 100755
--- a/Tools/scripts/smelly.py
+++ b/Tools/scripts/smelly.py
@@ -136,11 +136,14 @@ def check_extensions():
 
 
 def main():
+    nsymbol = 0
+
     # static library
     LIBRARY = sysconfig.get_config_var('LIBRARY')
     if not LIBRARY:
         raise Exception("failed to get LIBRARY variable from sysconfig")
-    nsymbol = check_library(LIBRARY)
+    if os.path.exists(LIBRARY):
+        nsymbol += check_library(LIBRARY)
 
     # dynamic library
     LDLIBRARY = sysconfig.get_config_var('LDLIBRARY')
diff --git a/Tools/scripts/stable_abi.py b/Tools/scripts/stable_abi.py
index 47547a9..117dfeb 100755
--- a/Tools/scripts/stable_abi.py
+++ b/Tools/scripts/stable_abi.py
@@ -2,8 +2,9 @@
 
 import argparse
 import glob
-import re
+import os.path
 import pathlib
+import re
 import subprocess
 import sys
 import sysconfig
@@ -213,7 +214,8 @@ def check_symbols(parser_args):
         LIBRARY = sysconfig.get_config_var("LIBRARY")
         if not LIBRARY:
             raise Exception("failed to get LIBRARY variable from sysconfig")
-        check_library(parser_args.stable_abi_file, LIBRARY, abi_funcs)
+        if os.path.exists(LIBRARY):
+            check_library(parser_args.stable_abi_file, LIBRARY, abi_funcs)
 
         # dynamic library
         LDLIBRARY = sysconfig.get_config_var("LDLIBRARY")
diff --git a/configure b/configure
index 8e0cc71..8c94825 100755
--- a/configure
+++ b/configure
@@ -624,6 +624,8 @@ ac_includes_default="\
 
 ac_subst_vars='LTLIBOBJS
 TEST_MODULES
+LIBRARY_DEPS
+STATIC_LIBPYTHON
 OPENSSL_LDFLAGS
 OPENSSL_LIBS
 OPENSSL_INCLUDES
@@ -856,6 +858,7 @@ with_openssl
 with_ssl_default_suites
 with_builtin_hashlib_hashes
 with_experimental_isolated_subinterpreters
+with_static_libpython
 enable_test_modules
 '
       ac_precious_vars='build_alias
@@ -1602,6 +1605,9 @@ Optional Packages:
   --with-experimental-isolated-subinterpreters
                           better isolate subinterpreters, experimental build
                           mode (default is no)
+  --without-static-libpython
+                          do not build libpythonMAJOR.MINOR.a and do not
+                          install python.o (default is yes)
 
 Some influential environment variables:
   MACHDEP     name for machine-dependent library files
@@ -17776,6 +17782,40 @@ $as_echo "no" >&6; }
 fi
 
 
+# --with-static-libpython
+STATIC_LIBPYTHON=1
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-static-libpython" >&5
+$as_echo_n "checking for --with-static-libpython... " >&6; }
+
+# Check whether --with-static-libpython was given.
+if test "${with_static_libpython+set}" = set; then :
+  withval=$with_static_libpython;
+if test "$withval" = no
+then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; };
+  STATIC_LIBPYTHON=0
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; };
+fi
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+fi
+
+LIBRARY_DEPS='$(PY3LIBRARY) $(EXPORTSYMS)'
+if test "$PY_ENABLE_SHARED" = 1; then
+    LIBRARY_DEPS="\$(LDLIBRARY) $LIBRARY_DEPS"
+    if test "$STATIC_LIBPYTHON" = 1; then
+        LIBRARY_DEPS="\$(LIBRARY) $LIBRARY_DEPS"
+    fi
+else
+    LIBRARY_DEPS="\$(LIBRARY) $LIBRARY_DEPS"
+fi
+
+
+
 # Check whether to disable test modules. Once set, setup.py will not build
 # test extension modules and "make install" will not install test suites.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for --disable-test-modules" >&5
diff --git a/configure.ac b/configure.ac
index 60c5d8e..2995793 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5882,6 +5882,33 @@ else
 fi],
 [AC_MSG_RESULT(no)])
 
+# --with-static-libpython
+STATIC_LIBPYTHON=1
+AC_MSG_CHECKING(for --with-static-libpython)
+AC_ARG_WITH(static-libpython,
+  AS_HELP_STRING([--without-static-libpython],
+                 [do not build libpythonMAJOR.MINOR.a and do not install python.o (default is yes)]),
+[
+if test "$withval" = no
+then
+  AC_MSG_RESULT(no);
+  STATIC_LIBPYTHON=0
+else
+  AC_MSG_RESULT(yes);
+fi],
+[AC_MSG_RESULT(yes)])
+LIBRARY_DEPS='$(PY3LIBRARY) $(EXPORTSYMS)'
+if test "$PY_ENABLE_SHARED" = 1; then
+    LIBRARY_DEPS="\$(LDLIBRARY) $LIBRARY_DEPS"
+    if test "$STATIC_LIBPYTHON" = 1; then
+        LIBRARY_DEPS="\$(LIBRARY) $LIBRARY_DEPS"
+    fi
+else
+    LIBRARY_DEPS="\$(LIBRARY) $LIBRARY_DEPS"
+fi
+AC_SUBST(STATIC_LIBPYTHON)
+AC_SUBST(LIBRARY_DEPS)
+
 # Check whether to disable test modules. Once set, setup.py will not build
 # test extension modules and "make install" will not install test suites.
 AC_MSG_CHECKING(for --disable-test-modules)