From 34069a2faeefec2d11f7d8224b95dad77b428fe3 Mon Sep 17 00:00:00 2001
From: Ben Gamari <ben@smart-cactus.org>
Date: Tue, 3 May 2022 12:40:43 -0400
Subject: rts/ghc.mk: Only build StgCRunAsm.S when it is needed

Previously the make build system unconditionally included StgCRunAsm.S
in the link, meaning that the RTS would require an execstack
unnecessarily.

Fixes #21478.
---
 rts/ghc.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rts/ghc.mk b/rts/ghc.mk
index 36a82f9f2c..0e56515a56 100644
--- a/rts/ghc.mk
+++ b/rts/ghc.mk
@@ -57,8 +57,11 @@ ifneq "$(PORTING_HOST)" "YES"
 
 # unregisterised builds use the mini interpreter
 ifneq "$(GhcUnregisterised)" "YES"
+# use StgCRunAsm.S on ppc, ppc64, s390x, and riscv64
+ifneq "$(findstring $(TargetArch_CPP), ppc) $(findstring $(TargetArch_CPP), ppc64) $(findstring $(TargetArch_CPP), s390x) $(findstring $(TargetArch_CPP), riscv64)" ""
 rts_S_SRCS += rts/StgCRunAsm.S
 endif
+endif
 
 # select adjustor implementation. This much match the logic in rts.cabal.in.
 ifneq "$(CLEANING)" "YES"
-- 
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