From e2812a6e96d3b8b76d8abf0c3b29f8d823f7f45c Mon Sep 17 00:00:00 2001
From: Nisarg Patel <33021055+hpcnpatel@users.noreply.github.com>
Date: Fri, 14 Apr 2023 03:02:43 +0200
Subject: Update m4 (#36835)

* Update m4

For %oneapi & %intel, we explicitly set -O0 so dependents of m4 do not break
        # The default optimization level for icx/icpx is "-O2",
        # but building m4 with this level breaks the build of dependents.
        # So we set it explicitely to "-O0".

* [@spackbot] updating style on behalf of hpcnpatel
---
 var/spack/repos/builtin/packages/m4/package.py | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'var')

diff --git a/var/spack/repos/builtin/packages/m4/package.py b/var/spack/repos/builtin/packages/m4/package.py
index f5bb11cee3..dede047da1 100644
--- a/var/spack/repos/builtin/packages/m4/package.py
+++ b/var/spack/repos/builtin/packages/m4/package.py
@@ -78,6 +78,13 @@ class M4(AutotoolsPackage, GNUMirrorPackage):
         # https://www.gnu.org/software/autoconf/manual/autoconf-2.67/html_node/autom4te-Invocation.html
         env.set("M4", self.prefix.bin.m4)
 
+    def setup_build_environment(self, env):
+        # The default optimization level for icx/icpx is "-O2",
+        # but building m4 with this level breaks the build of dependents.
+        # So we set it explicitely to "-O0".
+        if self.spec.satisfies("%intel") or self.spec.satisfies("%oneapi"):
+            env.append_flags("CFLAGS", "-O0")
+
     def setup_run_environment(self, env):
         env.set("M4", self.prefix.bin.m4)
 
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