[Buildroot] [PATCH] package/hare: define XDG_CACHE_HOME to avoid writing to $(HOME)

[Buildroot] [PATCH] package/hare: define XDG_CACHE_HOME to avoid writing to $(HOME)

[Thomas Petazzoni via buildroot]

The build process of host-hare attempts to write to the user $HOME
directory, which we try to avoid as it causes build failures such as:

Error creating /home/br-user/.cache/hare: Permission denied
make[2]: *** [Makefile:57: .bin/hare-configured] Error 255
make[2]: *** Waiting for unfinished jobs....
Error creating /home/br-user/.cache/hare: Permission denied
make[2]: *** [Makefile:63: .bin/haredoc] Error 255

when the user home directory is read-only. This is going to be the
case in all builds using our Docker container since commit
https://gitlab.com/buildroot.org/buildroot/-/commit/fac6d92a27925192b3cb8107449e7abfe01e2cf3.

We therefore ask host-hare to generate its cache, used during the
build, in $(@D)/.cache, using the XDG_CACHE_HOME environment variable.

Fixes: 72ff2ad88d6fd937da12abd4ed59a5fc10d021a0 ("package/hare: new host package")
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
François, please review carefully, as I'm not familiar with hare nor
with the impact of this cache's location.
---
 package/hare/hare.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/hare/hare.mk b/package/hare/hare.mk
index 88662d3c20..4acff091a5 100644
--- a/package/hare/hare.mk
+++ b/package/hare/hare.mk
@@ -27,6 +27,7 @@ HOST_HARE_CONF_OPTS = \
 	QBE="$(HOST_DIR)/bin/qbe" \
 	SCDOC="$(HOST_DIR)/bin/scdoc" \
 	HAREPATH="$(HOST_DIR)/src/hare/stdlib" \
+	XDG_CACHE_HOME="$(@D)/.cache" \
 	$(HOST_HARE_TARGET_ARCH)_AS=$(TARGET_AS) \
 	$(HOST_HARE_TARGET_ARCH)_CC=$(TARGET_CC) \
 	$(HOST_HARE_TARGET_ARCH)_LD=$(TARGET_LD)
-- 
2.56.0

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