gh-152902: Add Intel `icx` compiler to `configure.ac` (GH-152825)

zware <[email protected]>
Newsgroups gmane.comp.python.cvs
Message-ID <[email protected]> 
https://github.com/python/cpython/commit/cbe4977af3ac4c26cf1186c3cdae1cb8021651b9
commit: cbe4977af3ac4c26cf1186c3cdae1cb8021651b9
branch: main
author: hpkfft.com <[email protected]>
committer: zware <[email protected]>
date: 2026-07-21T20:25:47-05:00
summary:

gh-152902: Add Intel `icx` compiler to `configure.ac` (GH-152825)

files:
A Misc/NEWS.d/next/Build/2026-07-19-12-06-45.gh-issue-152902.0BXdab.rst
M configure
M configure.ac

diff --git a/Misc/NEWS.d/next/Build/2026-07-19-12-06-45.gh-issue-152902.0BXdab.rst b/Misc/NEWS.d/next/Build/2026-07-19-12-06-45.gh-issue-152902.0BXdab.rst
new file mode 100644
index 000000000000000..c084d32664a186c
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2026-07-19-12-06-45.gh-issue-152902.0BXdab.rst
@@ -0,0 +1,2 @@
+Added Intel ``icx`` compiler support to ``configure.ac``. Contributed by
+High Performance Kernels LLC.
diff --git a/configure b/configure
index 93bc5545e9de6ed..58f3dfc119ec13b 100755
--- a/configure
+++ b/configure
@@ -6402,6 +6402,8 @@ else case e in #(
 cat > conftest.c <<EOF
 #if defined(__EMSCRIPTEN__)
   emcc
+#elif defined(__INTEL_CLANG_COMPILER) || defined(__INTEL_LLVM_COMPILER)
+  icx
 #elif defined(__INTEL_COMPILER) || defined(__ICC)
   icc
 #elif defined(__ibmxl__) || defined(__xlc__) || defined(__xlC__)
@@ -6871,7 +6873,7 @@ else
   CXX="$ac_cv_path_CXX"
 fi
  ;;
-        clang)             if test -n "$ac_tool_prefix"; then
+        clang)  if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}clang++", so it can be a program name with args.
 set dummy ${ac_tool_prefix}clang++; ac_word=$2
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
@@ -6981,7 +6983,117 @@ else
   CXX="$ac_cv_path_CXX"
 fi
  ;;
-        icc)               if test -n "$ac_tool_prefix"; then
+        icx)    if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "${ac_tool_prefix}icpx", so it can be a program name with args.
+set dummy ${ac_tool_prefix}icpx; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_path_CXX+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) case $CXX in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_CXX="$CXX" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_path_CXX="$as_dir$ac_word$ac_exec_ext"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac ;;
+esac
+fi
+CXX=$ac_cv_path_CXX
+if test -n "$CXX"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $CXX" >&5
+printf "%s\n" "$CXX" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_path_CXX"; then
+  ac_pt_CXX=$CXX
+  # Extract the first word of "icpx", so it can be a program name with args.
+set dummy icpx; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_path_ac_pt_CXX+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) case $ac_pt_CXX in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_ac_pt_CXX="$ac_pt_CXX" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_path_ac_pt_CXX="$as_dir$ac_word$ac_exec_ext"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac ;;
+esac
+fi
+ac_pt_CXX=$ac_cv_path_ac_pt_CXX
+if test -n "$ac_pt_CXX"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_pt_CXX" >&5
+printf "%s\n" "$ac_pt_CXX" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+  if test "x$ac_pt_CXX" = x; then
+    CXX="notfound"
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+printf "%s\n" "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    CXX=$ac_pt_CXX
+  fi
+else
+  CXX="$ac_cv_path_CXX"
+fi
+ ;;
+        icc)    if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}icpc", so it can be a program name with args.
 set dummy ${ac_tool_prefix}icpc; ac_word=$2
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
@@ -9129,7 +9241,7 @@ fi
 LLVM_PROF_ERR=no
 
 case "$ac_cv_cc_name" in
-  clang)
+  clang|icx)
     # Any changes made here should be reflected in the GCC+Darwin case below
     PGO_PROF_GEN_FLAG="-fprofile-instr-generate"
     PGO_PROF_USE_FLAG="-fprofile-instr-use=\"\$(shell pwd)/code.profclangd\""
@@ -11415,6 +11527,10 @@ case "$ac_cv_cc_name" in
 mpicc)
     CFLAGS_NODIST="$CFLAGS_NODIST"
     ;;
+icx)
+    # ICX needs fp-model=precise (the default in clang) or floats behave badly
+    CFLAGS_NODIST="$CFLAGS_NODIST -ffp-model=precise"
+    ;;
 icc)
     # ICC needs -fp-model strict or floats behave badly
     CFLAGS_NODIST="$CFLAGS_NODIST -fp-model strict"
@@ -26950,8 +27066,8 @@ esac
 # rounding precision of 64 bits.  For gcc/x86, we can fix this by
 # using inline assembler to get and set the x87 FPU control word.
 
-# This inline assembler syntax may also work for suncc and icc,
-# so we try it on all platforms.
+# This inline assembler syntax works for icx and may also work for
+# suncc and icc, so we try it on all platforms.
 
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether we can use gcc inline assembler to get and set x87 control word" >&5
 printf %s "checking whether we can use gcc inline assembler to get and set x87 control word... " >&6; }
diff --git a/configure.ac b/configure.ac
index a9c706f3c23cb1c..273a64814f9a1fd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1096,6 +1096,8 @@ AC_CACHE_CHECK([for CC compiler name], [ac_cv_cc_name], [
 cat > conftest.c <<EOF
 #if defined(__EMSCRIPTEN__)
   emcc
+#elif defined(__INTEL_CLANG_COMPILER) || defined(__INTEL_LLVM_COMPILER)
+  icx
 #elif defined(__INTEL_COMPILER) || defined(__ICC)
   icc
 #elif defined(__ibmxl__) || defined(__xlc__) || defined(__xlC__)
@@ -1145,8 +1147,9 @@ then
         case "$ac_cv_cc_name" in
         gcc)    AC_PATH_TOOL([CXX], [g++], [notfound]) ;;
         cc)     AC_PATH_TOOL([CXX], [c++], [notfound]) ;;
-        clang)             AC_PATH_TOOL([CXX], [clang++], [notfound]) ;;
-        icc)               AC_PATH_TOOL([CXX], [icpc], [notfound]) ;;
+        clang)  AC_PATH_TOOL([CXX], [clang++], [notfound]) ;;
+        icx)    AC_PATH_TOOL([CXX], [icpx], [notfound]) ;;
+        icc)    AC_PATH_TOOL([CXX], [icpc], [notfound]) ;;
         esac
 	if test "$CXX" = "notfound"
 	then
@@ -2091,7 +2094,7 @@ fi
 LLVM_PROF_ERR=no
 
 case "$ac_cv_cc_name" in
-  clang)
+  clang|icx)
     # Any changes made here should be reflected in the GCC+Darwin case below
     PGO_PROF_GEN_FLAG="-fprofile-instr-generate"
     PGO_PROF_USE_FLAG="-fprofile-instr-use=\"\$(shell pwd)/code.profclangd\""
@@ -2969,6 +2972,10 @@ case "$ac_cv_cc_name" in
 mpicc)
     CFLAGS_NODIST="$CFLAGS_NODIST"
     ;;
+icx)
+    # ICX needs fp-model=precise (the default in clang) or floats behave badly
+    CFLAGS_NODIST="$CFLAGS_NODIST -ffp-model=precise"
+    ;;
 icc)
     # ICC needs -fp-model strict or floats behave badly
     CFLAGS_NODIST="$CFLAGS_NODIST -fp-model strict"
@@ -6345,8 +6352,8 @@ AX_C_FLOAT_WORDS_BIGENDIAN(
 # rounding precision of 64 bits.  For gcc/x86, we can fix this by
 # using inline assembler to get and set the x87 FPU control word.
 
-# This inline assembler syntax may also work for suncc and icc,
-# so we try it on all platforms.
+# This inline assembler syntax works for icx and may also work for
+# suncc and icc, so we try it on all platforms.
 
 AC_CACHE_CHECK([whether we can use gcc inline assembler to get and set x87 control word], [ac_cv_gcc_asm_for_x87], [
 AC_LINK_IFELSE(   [AC_LANG_PROGRAM([[]], [[

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