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um: Makefile: use bash from the environment

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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@posteo.net>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Yueh-Shun Li 2024-03-23 17:44:25 +00:00 committed by Richard Weinberger
parent a0fbbd36c1
commit 19ee69234a
1 changed files with 1 additions and 1 deletions
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arch/um/Makefile
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@ -20,7 +20,7 @@ endif
ARCH_DIR := arch/um ARCH_DIR := arch/um
# We require bash because the vmlinux link and loader script cpp use bash # We require bash because the vmlinux link and loader script cpp use bash
# features. # features.
SHELL := /bin/bash SHELL := bash
MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas