pythongh-116622: Rename build variable MODULE_LDFLAGS back to LIBPYTH…

…ON (python#122764)

(LIBPYTHON was renamed MODULE_LDFLAGS in commit 7f5e3f0.)

Makefile.pre.in

@@ -43,7 +43,7 @@ SOABI=		@SOABI@
 ABIFLAGS=	@ABIFLAGS@
 ABI_THREAD=	@ABI_THREAD@
 LDVERSION=	@LDVERSION@
-MODULE_LDFLAGS=@MODULE_LDFLAGS@
+LIBPYTHON=@LIBPYTHON@
 GITVERSION=	@GITVERSION@
 GITTAG=		@GITTAG@
 GITBRANCH=	@GITBRANCH@

Misc/NEWS.d/next/Build/2024-08-07-00-20-18.gh-issue-116622.U9cxHM.rst

@@ -0,0 +1,2 @@
+Rename build variable ``MODULE_LDFLAGS`` back to ``LIBPYTHON``, as it's used by
+package build systems (e.g. Meson).

Misc/python-config.sh.in

@@ -47,7 +47,7 @@ LIBM="@LIBM@"
 LIBC="@LIBC@"
 SYSLIBS="$LIBM $LIBC"
 ABIFLAGS="@ABIFLAGS@"
-LIBS="@MODULE_LDFLAGS@ @LIBS@ $SYSLIBS"
+LIBS="@LIBPYTHON@ @LIBS@ $SYSLIBS"
 LIBS_EMBED="-lpython${VERSION}${ABIFLAGS} @LIBS@ $SYSLIBS"
 BASECFLAGS="@BASECFLAGS@"
 LDLIBRARY="@LDLIBRARY@"

Misc/python.pc.in

@@ -9,5 +9,5 @@ Description: Build a C extension for Python
 Requires:
 Version: @VERSION@
 Libs.private: @LIBS@
-Libs: -L${libdir} @MODULE_LDFLAGS@
+Libs: -L${libdir} @LIBPYTHON@
 Cflags: -I${includedir}/python@VERSION@@ABIFLAGS@

Modules/makesetup

@@ -274,7 +274,7 @@ sed -e 's/[ 	]*#.*//' -e '/^[ 	]*$/d' |
 				;;
 			esac
 			rule="$file: $objs"
-			rule="$rule; \$(BLDSHARED) $objs $libs \$(MODULE_LDFLAGS) -o $file"
+			rule="$rule; \$(BLDSHARED) $objs $libs \$(LIBPYTHON) -o $file"
 			echo "$rule" >>$rulesf
 		done
 	done

configure.ac

@@ -6224,16 +6224,19 @@ AC_MSG_CHECKING([LDVERSION])
 LDVERSION='$(VERSION)$(ABIFLAGS)'
 AC_MSG_RESULT([$LDVERSION])
 
-# Configure the flags and dependencies used when compiling shared modules
+# Configure the flags and dependencies used when compiling shared modules.
+# Do not rename LIBPYTHON - it's accessed via sysconfig by package build
+# systems (e.g. Meson) to decide whether to link extension modules against
+# libpython.
 AC_SUBST([MODULE_DEPS_SHARED])
-AC_SUBST([MODULE_LDFLAGS])
+AC_SUBST([LIBPYTHON])
 MODULE_DEPS_SHARED='$(MODULE_DEPS_STATIC) $(EXPORTSYMS)'
-MODULE_LDFLAGS=''
+LIBPYTHON=''
 
 # On Android and Cygwin the shared libraries must be linked with libpython.
 if test "$PY_ENABLE_SHARED" = "1" && ( test -n "$ANDROID_API_LEVEL" || test "$MACHDEP" = "cygwin"); then
   MODULE_DEPS_SHARED="$MODULE_DEPS_SHARED \$(LDLIBRARY)"
-  MODULE_LDFLAGS="\$(BLDLIBRARY)"
+  LIBPYTHON="\$(BLDLIBRARY)"
 fi
 
 # On iOS the shared libraries must be linked with the Python framework