Workaround Debian's broken System.map behavior

Debian ships fake System.map files by default, leading to the invocation of depmod with them to flood you with errors about missing symbols. Let's notice and not do that. Signed-off-by: Rich Ercolani <[email protected]>
openzfs · Dec 15, 2021 · bd067fe · bd067fe
1 parent f291fa6
commit bd067fe
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/module/Makefile.in b/module/Makefile.in
@@ -90,9 +90,15 @@ modules_install-Linux:
 	if [ -n "$(DESTDIR)" ]; then \
 		find $$kmoddir -name 'modules.*' | xargs $(RM); \
 	fi
+	@# Debian ships sub-1kb fake System.map files that just say
+	@# "if you want system.map go install this package"
+	@# Naturally, depmod is less than amused by this.
 	sysmap=$(INSTALL_MOD_PATH)/boot/System.map-@LINUX_VERSION@; \
 	if [ -f $$sysmap ]; then \
-		depmod -ae -F $$sysmap @LINUX_VERSION@; \
+		size=$$(find $$sysmap -type f -size +1024c); \
+		if [ ! -z "$$size" ]; then \
+			depmod -ae -F $$sysmap @LINUX_VERSION@; \
+		fi \
 	fi
 
 modules_install-FreeBSD: