[PATCH v2] um: Makefile: use bash from the environment

From: Yueh-Shun Li
Date: Sat Mar 23 2024 - 13:45:35 EST


Set Makefile SHELL to bash instead of /bin/bash for better portability.

Some systems do not install binaries to /bin, and therefore do not
provide /bin/bash. This includes Linux distros which intentionally avoid
implementing the Filesystem Hierarchy Standard (FHS), such as NixOS and
Guix System.

The recipies inside arch/um/Makefile don't require top-level Bash to
build, and setting "SHELL" to "bash" makes Make pick the Bash executable
from the environment, hence this patch.

Changes since last roll:
- Rebase onto a more recent commit on the master branch.
- Remove a dangling in-text citation from the change log.
- Reword the change log.

Signed-off-by: Yueh-Shun Li <shamrocklee@xxxxxxxxxx>
---
arch/um/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/um/Makefile b/arch/um/Makefile
index 34957dcb88b9..00b63bac5eff 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -20,7 +20,7 @@ endif
ARCH_DIR := arch/um
# We require bash because the vmlinux link and loader script cpp use bash
# features.
-SHELL := /bin/bash
+SHELL := bash

MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas

--
2.42.0