From 0a9fcbbce723f2190a0a6dd527bbdb9c28b9a1a5 Mon Sep 17 00:00:00 2001
From: Mark Wooding <mdw@distorted.org.uk>
Date: Sat, 21 Sep 2019 20:08:07 +0100
Subject: [PATCH] Maintain a separate ccache directory for each target.

Otherwise they interfere with each other.  How did I not notice this
before?
---
 Makefile        | 11 +++++++++++
 bin/buildwrap   |  2 +-
 etc/ccache.conf |  3 +++
 3 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 etc/ccache.conf

diff --git a/Makefile b/Makefile
index 3a3d48a..07f2d3c 100644
--- a/Makefile
+++ b/Makefile
@@ -583,6 +583,17 @@ $(CHECK_SCHROOT_SCRIPTS): check-script/%:
 .PHONY: $(addprefix check-script/,$(SCHROOT_SCRIPTS))
 
 ###--------------------------------------------------------------------------
+### Ccache setup.
+
+CCACHE_CONFIGS		 = $(foreach r,$(ALL_CHROOTS), \
+	/var/lib/sbuild/build/.ccache/$(LVPREFIX)$r/ccache.conf)
+all:: $(CCACHE_CONFIGS)
+$(CCACHE_CONFIGS): /var/lib/sbuild/build/.ccache/$(LVPREFIX)%/ccache.conf: \
+		etc/ccache.conf
+	$(V_AT)mkdir -p $(dir $@)
+	$(call v_tag,COPY)cp $< $@.new && mv $@.new $@
+
+###--------------------------------------------------------------------------
 ### `/usr/local/' structure.
 
 LOCAL_COMMON_DIRS	 = share/ src/
diff --git a/bin/buildwrap b/bin/buildwrap
index e367b1b..5b9068d 100755
--- a/bin/buildwrap
+++ b/bin/buildwrap
@@ -26,7 +26,7 @@
 
 ## Set up compiler caching.  This makes a big difference to build times.
 PATH=/usr/lib/ccache:$PATH; export PATH
-CCACHE_DIR=/build/.ccache; export CCACHE_DIR
+CCACHE_DIR=/build/.ccache/$SCHROOT_CHROOT_NAME; export CCACHE_DIR
 unset CCACHE_HARDLINK
 CCACHE_COMPRESS=t; export CCACHE_COMPRESS
 CCACHE_UMASK=002; export CCACHE_UMASK
diff --git a/etc/ccache.conf b/etc/ccache.conf
new file mode 100644
index 0000000..a76ac41
--- /dev/null
+++ b/etc/ccache.conf
@@ -0,0 +1,3 @@
+### -*-conf-*-
+
+max_size = 256Mi
-- 
2.11.0