bpo-43617: Check autoconf-archive package in configure.ac (GH-25016)

Signed-off-by: Christian Heimes <christian@python.org>

6 files changed, 225 insertions, 216 deletions

diff --git a/Misc/NEWS.d/next/Build/2021-03-24-16-55-55.bpo-43617.d69KAv.rst b/Misc/NEWS.d/next/Build/2021-03-24-16-55-55.bpo-43617.d69KAv.rst
new file mode 100644
index 0000000..2678396
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2021-03-24-16-55-55.bpo-43617.d69KAv.rst
@@ -0,0 +1,2 @@
+Improve configure.ac: Check for presence of autoconf-archive package and
+remove our copies of M4 macros.
diff --git a/aclocal.m4 b/aclocal.m4
index 99913e7..f497f28 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -12,6 +12,90 @@
 # PARTICULAR PURPOSE.
 
 m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
+# ===============================================================================
+#  https://www.gnu.org/software/autoconf-archive/ax_c_float_words_bigendian.html
+# ===============================================================================
+#
+# SYNOPSIS
+#
+#   AX_C_FLOAT_WORDS_BIGENDIAN([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN])
+#
+# DESCRIPTION
+#
+#   Checks the ordering of words within a multi-word float. This check is
+#   necessary because on some systems (e.g. certain ARM systems), the float
+#   word ordering can be different from the byte ordering. In a multi-word
+#   float context, "big-endian" implies that the word containing the sign
+#   bit is found in the memory location with the lowest address. This
+#   implementation was inspired by the AC_C_BIGENDIAN macro in autoconf.
+#
+#   The endianness is detected by first compiling C code that contains a
+#   special double float value, then grepping the resulting object file for
+#   certain strings of ASCII values. The double is specially crafted to have
+#   a binary representation that corresponds with a simple string. In this
+#   implementation, the string "noonsees" was selected because the
+#   individual word values ("noon" and "sees") are palindromes, thus making
+#   this test byte-order agnostic. If grep finds the string "noonsees" in
+#   the object file, the target platform stores float words in big-endian
+#   order. If grep finds "seesnoon", float words are in little-endian order.
+#   If neither value is found, the user is instructed to specify the
+#   ordering.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Daniel Amelang <dan@amelang.net>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 11
+
+AC_DEFUN([AX_C_FLOAT_WORDS_BIGENDIAN],
+  [AC_CACHE_CHECK(whether float word ordering is bigendian,
+                  ax_cv_c_float_words_bigendian, [
+
+ax_cv_c_float_words_bigendian=unknown
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+
+double d = 90904234967036810337470478905505011476211692735615632014797120844053488865816695273723469097858056257517020191247487429516932130503560650002327564517570778480236724525140520121371739201496540132640109977779420565776568942592.0;
+
+]])], [
+
+if grep noonsees conftest.$ac_objext >/dev/null ; then
+  ax_cv_c_float_words_bigendian=yes
+fi
+if grep seesnoon conftest.$ac_objext >/dev/null ; then
+  if test "$ax_cv_c_float_words_bigendian" = unknown; then
+    ax_cv_c_float_words_bigendian=no
+  else
+    ax_cv_c_float_words_bigendian=unknown
+  fi
+fi
+
+])])
+
+case $ax_cv_c_float_words_bigendian in
+  yes)
+    m4_default([$1],
+      [AC_DEFINE([FLOAT_WORDS_BIGENDIAN], 1,
+                 [Define to 1 if your system stores words within floats
+                  with the most significant word first])]) ;;
+  no)
+    $2 ;;
+  *)
+    m4_default([$3],
+      [AC_MSG_ERROR([
+
+Unknown float word ordering. You need to manually preset
+ax_cv_c_float_words_bigendian=no (or yes) according to your system.
+
+    ])]) ;;
+esac
+
+])# AX_C_FLOAT_WORDS_BIGENDIAN
+
 # ===========================================================================
 #  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
 # ===========================================================================
@@ -66,6 +150,131 @@ AS_VAR_IF(CACHEVAR,yes,
 AS_VAR_POPDEF([CACHEVAR])dnl
 ])dnl AX_CHECK_COMPILE_FLAGS
 
+# ===========================================================================
+#     https://www.gnu.org/software/autoconf-archive/ax_check_openssl.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_OPENSSL([action-if-found[, action-if-not-found]])
+#
+# DESCRIPTION
+#
+#   Look for OpenSSL in a number of default spots, or in a user-selected
+#   spot (via --with-openssl).  Sets
+#
+#     OPENSSL_INCLUDES to the include directives required
+#     OPENSSL_LIBS to the -l directives required
+#     OPENSSL_LDFLAGS to the -L or -R flags required
+#
+#   and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
+#
+#   This macro sets OPENSSL_INCLUDES such that source files should use the
+#   openssl/ directory in include directives:
+#
+#     #include <openssl/hmac.h>
+#
+# LICENSE
+#
+#   Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
+#   Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.com>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 10
+
+AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
+AC_DEFUN([AX_CHECK_OPENSSL], [
+    found=false
+    AC_ARG_WITH([openssl],
+        [AS_HELP_STRING([--with-openssl=DIR],
+            [root of the OpenSSL directory])],
+        [
+            case "$withval" in
+            "" | y | ye | yes | n | no)
+            AC_MSG_ERROR([Invalid --with-openssl value])
+              ;;
+            *) ssldirs="$withval"
+              ;;
+            esac
+        ], [
+            # if pkg-config is installed and openssl has installed a .pc file,
+            # then use that information and don't search ssldirs
+            AC_CHECK_TOOL([PKG_CONFIG], [pkg-config])
+            if test x"$PKG_CONFIG" != x""; then
+                OPENSSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null`
+                if test $? = 0; then
+                    OPENSSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null`
+                    OPENSSL_INCLUDES=`$PKG_CONFIG openssl --cflags-only-I 2>/dev/null`
+                    found=true
+                fi
+            fi
+
+            # no such luck; use some default ssldirs
+            if ! $found; then
+                ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
+            fi
+        ]
+        )
+
+
+    # note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
+    # an 'openssl' subdirectory
+
+    if ! $found; then
+        OPENSSL_INCLUDES=
+        for ssldir in $ssldirs; do
+            AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
+            if test -f "$ssldir/include/openssl/ssl.h"; then
+                OPENSSL_INCLUDES="-I$ssldir/include"
+                OPENSSL_LDFLAGS="-L$ssldir/lib"
+                OPENSSL_LIBS="-lssl -lcrypto"
+                found=true
+                AC_MSG_RESULT([yes])
+                break
+            else
+                AC_MSG_RESULT([no])
+            fi
+        done
+
+        # if the file wasn't found, well, go ahead and try the link anyway -- maybe
+        # it will just work!
+    fi
+
+    # try the preprocessor and linker with our new flags,
+    # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
+
+    AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
+    echo "Trying link with OPENSSL_LDFLAGS=$OPENSSL_LDFLAGS;" \
+        "OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_INCLUDES=$OPENSSL_INCLUDES" >&AS_MESSAGE_LOG_FD
+
+    save_LIBS="$LIBS"
+    save_LDFLAGS="$LDFLAGS"
+    save_CPPFLAGS="$CPPFLAGS"
+    LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS"
+    LIBS="$OPENSSL_LIBS $LIBS"
+    CPPFLAGS="$OPENSSL_INCLUDES $CPPFLAGS"
+    AC_LINK_IFELSE(
+        [AC_LANG_PROGRAM([#include <openssl/ssl.h>], [SSL_new(NULL)])],
+        [
+            AC_MSG_RESULT([yes])
+            $1
+        ], [
+            AC_MSG_RESULT([no])
+            $2
+        ])
+    CPPFLAGS="$save_CPPFLAGS"
+    LDFLAGS="$save_LDFLAGS"
+    LIBS="$save_LIBS"
+
+    AC_SUBST([OPENSSL_INCLUDES])
+    AC_SUBST([OPENSSL_LIBS])
+    AC_SUBST([OPENSSL_LDFLAGS])
+])
+
 # pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
 # serial 11 (pkg-config-0.29.1)
 
@@ -410,5 +619,3 @@ AS_IF([test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"],
         [AC_DEFINE([HAVE_][$1], 1, [Enable ]m4_tolower([$1])[ support])])
 ])dnl PKG_HAVE_DEFINE_WITH_MODULES
 
-m4_include([m4/ax_c_float_words_bigendian.m4])
-m4_include([m4/ax_check_openssl.m4])
diff --git a/configure b/configure
index f9b2aff..6ba109b 100755
--- a/configure
+++ b/configure
@@ -1594,7 +1594,7 @@ Optional Packages:
   --with-ensurepip[=install|upgrade|no]
                           "install" or "upgrade" using bundled pip (default is
                           upgrade)
-  --with-openssl=DIR      override root of the OpenSSL directory to DIR
+  --with-openssl=DIR      root of the OpenSSL directory
   --with-openssl-rpath=[DIR|auto|no]
                           Set runtime library directory (rpath) for OpenSSL
                           libraries, no (default): don't set rpath, auto:
@@ -14571,10 +14571,10 @@ _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
 
 
-if $GREP noonsees conftest.$ac_objext >/dev/null ; then
+if grep noonsees conftest.$ac_objext >/dev/null ; then
   ax_cv_c_float_words_bigendian=yes
 fi
-if $GREP seesnoon conftest.$ac_objext >/dev/null ; then
+if grep seesnoon conftest.$ac_objext >/dev/null ; then
   if test "$ax_cv_c_float_words_bigendian" = unknown; then
     ax_cv_c_float_words_bigendian=no
   else
diff --git a/configure.ac b/configure.ac
index e43b773..0db7e60 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,9 @@
-dnl ***********************************************
-dnl * Please run autoreconf to test your changes! *
-dnl ***********************************************
+dnl ***************************************************
+dnl * Please run autoreconf -if to test your changes! *
+dnl ***************************************************
+dnl
+dnl Python's configure script requires autoconf 2.69 and autoconf-archive.
+dnl
 
 # Set VERSION so we only need to edit in one place (i.e., here)
 m4_define(PYTHON_VERSION, 3.10)
@@ -9,7 +12,11 @@ AC_PREREQ([2.69])
 
 AC_INIT([python],[PYTHON_VERSION],[https://bugs.python.org/])
 
-AC_CONFIG_MACRO_DIR(m4)
+m4_ifdef(
+    [AX_C_FLOAT_WORDS_BIGENDIAN],
+    [],
+    [AC_MSG_ERROR([Please install autoconf-archive package and re-run autoreconf])]
+)
 
 AC_SUBST(BASECPPFLAGS)
 if test "$srcdir" != . -a "$srcdir" != "$(pwd)"; then
diff --git a/m4/ax_c_float_words_bigendian.m4 b/m4/ax_c_float_words_bigendian.m4
deleted file mode 100644
index 746228c..0000000
--- a/m4/ax_c_float_words_bigendian.m4
+++ /dev/null
@@ -1,83 +0,0 @@
-# ===============================================================================
-#  https://www.gnu.org/software/autoconf-archive/ax_c_float_words_bigendian.html
-# ===============================================================================
-#
-# SYNOPSIS
-#
-#   AX_C_FLOAT_WORDS_BIGENDIAN([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN])
-#
-# DESCRIPTION
-#
-#   Checks the ordering of words within a multi-word float. This check is
-#   necessary because on some systems (e.g. certain ARM systems), the float
-#   word ordering can be different from the byte ordering. In a multi-word
-#   float context, "big-endian" implies that the word containing the sign
-#   bit is found in the memory location with the lowest address. This
-#   implementation was inspired by the AC_C_BIGENDIAN macro in autoconf.
-#
-#   The endianness is detected by first compiling C code that contains a
-#   special double float value, then grepping the resulting object file for
-#   certain strings of ASCII values. The double is specially crafted to have
-#   a binary representation that corresponds with a simple string. In this
-#   implementation, the string "noonsees" was selected because the
-#   individual word values ("noon" and "sees") are palindromes, thus making
-#   this test byte-order agnostic. If grep finds the string "noonsees" in
-#   the object file, the target platform stores float words in big-endian
-#   order. If grep finds "seesnoon", float words are in little-endian order.
-#   If neither value is found, the user is instructed to specify the
-#   ordering.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Daniel Amelang <dan@amelang.net>
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved. This file is offered as-is, without any
-#   warranty.
-
-#serial 11
-
-AC_DEFUN([AX_C_FLOAT_WORDS_BIGENDIAN],
-  [AC_CACHE_CHECK(whether float word ordering is bigendian,
-                  ax_cv_c_float_words_bigendian, [
-
-ax_cv_c_float_words_bigendian=unknown
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-
-double d = 90904234967036810337470478905505011476211692735615632014797120844053488865816695273723469097858056257517020191247487429516932130503560650002327564517570778480236724525140520121371739201496540132640109977779420565776568942592.0;
-
-]])], [
-
-if $GREP noonsees conftest.$ac_objext >/dev/null ; then
-  ax_cv_c_float_words_bigendian=yes
-fi
-if $GREP seesnoon conftest.$ac_objext >/dev/null ; then
-  if test "$ax_cv_c_float_words_bigendian" = unknown; then
-    ax_cv_c_float_words_bigendian=no
-  else
-    ax_cv_c_float_words_bigendian=unknown
-  fi
-fi
-
-])])
-
-case $ax_cv_c_float_words_bigendian in
-  yes)
-    m4_default([$1],
-      [AC_DEFINE([FLOAT_WORDS_BIGENDIAN], 1,
-                 [Define to 1 if your system stores words within floats
-                  with the most significant word first])]) ;;
-  no)
-    $2 ;;
-  *)
-    m4_default([$3],
-      [AC_MSG_ERROR([
-
-Unknown float word ordering. You need to manually preset
-ax_cv_c_float_words_bigendian=no (or yes) according to your system.
-
-    ])]) ;;
-esac
-
-])# AX_C_FLOAT_WORDS_BIGENDIAN
diff --git a/m4/ax_check_openssl.m4 b/m4/ax_check_openssl.m4
deleted file mode 100644
index 2846fd1..0000000
--- a/m4/ax_check_openssl.m4
+++ /dev/null
@@ -1,124 +0,0 @@
-# ===========================================================================
-#     https://www.gnu.org/software/autoconf-archive/ax_check_openssl.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_CHECK_OPENSSL([action-if-found[, action-if-not-found]])
-#
-# DESCRIPTION
-#
-#   Look for OpenSSL in a number of default spots, or in a user-selected
-#   spot (via --with-openssl).  Sets
-#
-#     OPENSSL_INCLUDES to the include directives required
-#     OPENSSL_LIBS to the -l directives required
-#     OPENSSL_LDFLAGS to the -L or -R flags required
-#
-#   and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
-#
-#   This macro sets OPENSSL_INCLUDES such that source files should use the
-#   openssl/ directory in include directives:
-#
-#     #include <openssl/hmac.h>
-#
-# LICENSE
-#
-#   Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
-#   Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.com>
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved. This file is offered as-is, without any
-#   warranty.
-
-#serial 10
-
-AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
-AC_DEFUN([AX_CHECK_OPENSSL], [
-    found=false
-    AC_ARG_WITH([openssl],
-        [AS_HELP_STRING([--with-openssl=DIR],
-            [override root of the OpenSSL directory to DIR])],
-        [
-            case "$withval" in
-            "" | y | ye | yes | n | no)
-            AC_MSG_ERROR([Invalid --with-openssl value])
-              ;;
-            *) ssldirs="$withval"
-              ;;
-            esac
-        ], [
-            # if pkg-config is installed and openssl has installed a .pc file,
-            # then use that information and don't search ssldirs
-            AC_CHECK_TOOL([PKG_CONFIG], [pkg-config])
-            if test x"$PKG_CONFIG" != x""; then
-                OPENSSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null`
-                if test $? = 0; then
-                    OPENSSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null`
-                    OPENSSL_INCLUDES=`$PKG_CONFIG openssl --cflags-only-I 2>/dev/null`
-                    found=true
-                fi
-            fi
-
-            # no such luck; use some default ssldirs
-            if ! $found; then
-                ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
-            fi
-        ]
-        )
-
-
-    # note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
-    # an 'openssl' subdirectory
-
-    if ! $found; then
-        OPENSSL_INCLUDES=
-        for ssldir in $ssldirs; do
-            AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
-            if test -f "$ssldir/include/openssl/ssl.h"; then
-                OPENSSL_INCLUDES="-I$ssldir/include"
-                OPENSSL_LDFLAGS="-L$ssldir/lib"
-                OPENSSL_LIBS="-lssl -lcrypto"
-                found=true
-                AC_MSG_RESULT([yes])
-                break
-            else
-                AC_MSG_RESULT([no])
-            fi
-        done
-
-        # if the file wasn't found, well, go ahead and try the link anyway -- maybe
-        # it will just work!
-    fi
-
-    # try the preprocessor and linker with our new flags,
-    # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
-
-    AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
-    echo "Trying link with OPENSSL_LDFLAGS=$OPENSSL_LDFLAGS;" \
-        "OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_INCLUDES=$OPENSSL_INCLUDES" >&AS_MESSAGE_LOG_FD
-
-    save_LIBS="$LIBS"
-    save_LDFLAGS="$LDFLAGS"
-    save_CPPFLAGS="$CPPFLAGS"
-    LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS"
-    LIBS="$OPENSSL_LIBS $LIBS"
-    CPPFLAGS="$OPENSSL_INCLUDES $CPPFLAGS"
-    AC_LINK_IFELSE(
-        [AC_LANG_PROGRAM([#include <openssl/ssl.h>], [SSL_new(NULL)])],
-        [
-            AC_MSG_RESULT([yes])
-            $1
-        ], [
-            AC_MSG_RESULT([no])
-            $2
-        ])
-    CPPFLAGS="$save_CPPFLAGS"
-    LDFLAGS="$save_LDFLAGS"
-    LIBS="$save_LIBS"
-
-    AC_SUBST([OPENSSL_INCLUDES])
-    AC_SUBST([OPENSSL_LIBS])
-    AC_SUBST([OPENSSL_LDFLAGS])
-])