gh-93491: Add support tier detection to configure (GH-93492)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Steve Dower <steve.dower@microsoft.com>
Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@protonmail.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/configure b/configure
index 601089c..677de64 100755
--- a/configure
+++ b/configure
@@ -5213,6 +5213,39 @@ $as_echo "$ac_cv_path_EGREP" >&6; }
 
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for CC compiler name" >&5
+$as_echo_n "checking for CC compiler name... " >&6; }
+if ${ac_cv_cc_name+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+cat > conftest.c <<EOF
+#if defined(__INTEL_COMPILER) || defined(__ICC)
+  icc
+#elif defined(__ibmxl__) || defined(__xlc__) || defined(__xlC__)
+  xlc
+#elif defined(_MSC_VER)
+  msvc
+#elif defined(__clang__)
+  clang
+#elif defined(__GNUC__)
+  gcc
+#else
+#  error unknown compiler
+#endif
+EOF
+
+if $CPP $CPPFLAGS conftest.c >conftest.out 2>/dev/null; then
+  ac_cv_cc_name=`grep -v '^#' conftest.out | grep -v '^ *$' | tr -d ' 	'`
+else
+  ac_cv_cc_name="unknown"
+fi
+rm -f conftest.c conftest.out
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_cc_name" >&5
+$as_echo "$ac_cv_cc_name" >&6; }
+
 # checks for UNIX variants that set C preprocessor variables
 # may set _GNU_SOURCE, __EXTENSIONS__, _POSIX_PTHREAD_SEMANTICS,
 # _POSIX_SOURCE, _POSIX_1_SOURCE, and more
@@ -6172,6 +6205,66 @@ if test x$MULTIARCH != x; then
 fi
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for PEP 11 support tier" >&5
+$as_echo_n "checking for PEP 11 support tier... " >&6; }
+case $host/$ac_cv_cc_name in #(
+  x86_64-*-linux-gnu/gcc) :
+    PY_SUPPORT_TIER=1 ;; #(
+    x86_64-apple-darwin*/clang) :
+    PY_SUPPORT_TIER=1 ;; #(
+    i686-pc-windows-msvc/msvc) :
+    PY_SUPPORT_TIER=1 ;; #(
+    x86_64-pc-windows-msvc/msvc) :
+    PY_SUPPORT_TIER=1 ;; #(
+
+  aarch64-apple-darwin*/clang) :
+    PY_SUPPORT_TIER=2 ;; #(
+    aarch64-*-linux-gnu/gcc) :
+    PY_SUPPORT_TIER=2 ;; #(
+    aarch64-*-linux-gnu/clang) :
+    PY_SUPPORT_TIER=2 ;; #(
+  powerpc64le-*-linux-gnu/gcc) :
+    PY_SUPPORT_TIER=2 ;; #(
+    x86_64-*-linux-gnu/clang) :
+    PY_SUPPORT_TIER=2 ;; #(
+
+  aarch64-pc-windows-msvc/msvc) :
+    PY_SUPPORT_TIER=3 ;; #(
+    armv7l-*-linux-gnueabihf/gcc) :
+    PY_SUPPORT_TIER=3 ;; #(
+    powerpc64le-*-linux-gnu/clang) :
+    PY_SUPPORT_TIER=3 ;; #(
+    s390x-*-linux-gnu/gcc) :
+    PY_SUPPORT_TIER=3 ;; #(
+        x86_64-*-freebsd/clang) :
+    PY_SUPPORT_TIER=3 ;; #(
+  *) :
+      PY_SUPPORT_TIER=0
+ ;;
+esac
+
+case $PY_SUPPORT_TIER in #(
+  1) :
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $host/$ac_cv_cc_name has tier 1 (supported)" >&5
+$as_echo "$host/$ac_cv_cc_name has tier 1 (supported)" >&6; } ;; #(
+  2) :
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $host/$ac_cv_cc_name has tier 2 (supported)" >&5
+$as_echo "$host/$ac_cv_cc_name has tier 2 (supported)" >&6; } ;; #(
+  3) :
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $host/$ac_cv_cc_name has tier 3 (partially supported)" >&5
+$as_echo "$host/$ac_cv_cc_name has tier 3 (partially supported)" >&6; } ;; #(
+  *) :
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $host/$ac_cv_cc_name is not supported" >&5
+$as_echo "$as_me: WARNING: $host/$ac_cv_cc_name is not supported" >&2;}
+ ;;
+esac
+
+
+cat >>confdefs.h <<_ACEOF
+#define PY_SUPPORT_TIER $PY_SUPPORT_TIER
+_ACEOF
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for -Wl,--no-as-needed" >&5
 $as_echo_n "checking for -Wl,--no-as-needed... " >&6; }
 if ${ac_cv_wl_no_as_needed+:} false; then :
@@ -26296,3 +26389,16 @@ If you want a release build with all stable optimizations active (PGO, etc),
 please run ./configure --enable-optimizations
 " >&6;}
 fi
+
+if test "x$PY_SUPPORT_TIER" = x0; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING:
+
+Platform \"$host\" with compiler \"$ac_cv_cc_name\" is not supported by the
+CPython core team, see https://peps.python.org/pep-0011/ for more information.
+" >&5
+$as_echo "$as_me: WARNING:
+
+Platform \"$host\" with compiler \"$ac_cv_cc_name\" is not supported by the
+CPython core team, see https://peps.python.org/pep-0011/ for more information.
+" >&2;}
+fi