From d2385bd0e569562c83771386010396ee2d6fb90b Mon Sep 17 00:00:00 2001
From: Richard Lau <richard.lau@ibm.com>
Date: Thu, 20 Aug 2026 16:12:22 +0000
Subject: [PATCH] build: target Power 9 and z14

Set compiler flags to match the minimum supported Power and z
architectures.

Signed-off-by: Richard Lau <richard.lau@ibm.com>
---
 common.gypi                      | 16 ++++++++--------
 node.gypi                        |  6 ++++++
 tools/v8_gypfiles/toolchain.gypi |  4 ++--
 3 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/common.gypi b/common.gypi
index 0b01ec8c49fe..a83523286a91 100644
--- a/common.gypi
+++ b/common.gypi
@@ -604,12 +604,12 @@
                     'cflags': [ '-mminimal-toc' ],
                   }],
                 ],
-                'cflags': [ '-m64' ],
-                'ldflags': [ '-m64' ],
+                'cflags': [ '-m64', '-mcpu=power9' ],
+                'ldflags': [ '-m64', '-mcpu=power9' ],
               }],
               [ 'host_arch=="s390x" and OS=="linux"', {
-                'cflags': [ '-m64', '-march=z196' ],
-                'ldflags': [ '-m64', '-march=z196' ],
+                'cflags': [ '-m64', '-march=z14' ],
+                'ldflags': [ '-m64', '-march=z14' ],
               }],
             ],
           }],
@@ -629,12 +629,12 @@
                     'cflags': [ '-mminimal-toc' ],
                   }],
                 ],
-                'cflags': [ '-m64' ],
-                'ldflags': [ '-m64' ],
+                'cflags': [ '-m64', '-mcpu=power9' ],
+                'ldflags': [ '-m64', '-mcpu=power9' ],
               }],
               [ 'target_arch=="s390x" and OS=="linux"', {
-                'cflags': [ '-m64', '-march=z196' ],
-                'ldflags': [ '-m64', '-march=z196' ],
+                'cflags': [ '-m64', '-march=z14' ],
+                'ldflags': [ '-m64', '-march=z14' ],
               }],
             ],
           }],
diff --git a/node.gypi b/node.gypi
index 3636633c622a..104e884e6614 100644
--- a/node.gypi
+++ b/node.gypi
@@ -87,6 +87,12 @@
     [ 'OS=="aix" or OS=="os400"', {
       'cflags': [ '-mcpu=power9' ],
     }],
+    [ 'OS=="linux" and target_arch=="ppc64"', {
+      'cflags': [ '-mcpu=power9' ],
+    }],
+    [ 'OS=="linux" and target_arch=="s390x"', {
+      'cflags': [ '-march=z14' ],
+    }],
     [ 'node_enable_d8=="true"', {
       'dependencies': [ 'tools/v8_gypfiles/d8.gyp:d8' ],
     }],
diff --git a/tools/v8_gypfiles/toolchain.gypi b/tools/v8_gypfiles/toolchain.gypi
index 5aa9d020a920..3676848df8a4 100644
--- a/tools/v8_gypfiles/toolchain.gypi
+++ b/tools/v8_gypfiles/toolchain.gypi
@@ -316,7 +316,7 @@
               'V8_TARGET_ARCH_S390_LE_SIM',
             ],
           }, {
-            'cflags': [ '-march=z196' ],
+            'cflags': [ '-march=z14' ],
           }],
           ],
       }],  # s390x
@@ -326,11 +326,11 @@
         ],
         'cflags': [
           '-ffp-contract=off',
+          '-mcpu=power9',
         ],
         'conditions': [
           ['OS=="aix" or OS=="os400"', {
             # Work around AIX ceil, trunc and round oddities.
-            'cflags': [ '-mcpu=power9' ],
             'conditions': [
               ['clang==0', {
                 'cflags': [ '-mfprnd' ],