[ptxdist] [PATCH] systemd: add setting to enable ldconfig service

[Clemens Gruber <clemens.gruber@pqgruber.com>]

Add a ptxdist setting to enable the systemd ldconfig.service, which
calls /sbin/ldconfig -X if /etc/ld.so.cache does not exist and the
machine boots or was updated.
Having a /etc/ld.so.cache file reduces the number of necessary syscalls
dramatically. This is especially noticeable when often calling small
binaries like /bin/true.
See: LD_DEBUG=libs /bin/true or strace /bin/true

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 rules/systemd.in   | 7 +++++++
 rules/systemd.make | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/rules/systemd.in b/rules/systemd.in
index 876a890..fba72bc 100644
--- a/rules/systemd.in
+++ b/rules/systemd.in
@@ -73,6 +73,13 @@ config SYSTEMD_DISABLE_RANDOM_SEED
 	  the random seed is not possible.
 	  Warning: enabling this option may be insecure.
 
+config SYSTEMD_LDCONFIG
+	bool
+	prompt "enable ldconfig to initialize /etc/ld.so.cache"
+	help
+	  Enables ldconfig.service, which calls ldconfig at first boot and after
+	  systemd-update-done if /etc/ld.so.cache does not exist.
+
 config SYSTEMD_LOGIND
 	bool
 	select SYSTEMD_DBUS
diff --git a/rules/systemd.make b/rules/systemd.make
index 71c633a..776942d 100644
--- a/rules/systemd.make
+++ b/rules/systemd.make
@@ -121,7 +121,7 @@ SYSTEMD_CONF_OPT	:= \
 	--$(call ptx/endis,PTXCONF_UDEV_HWDB)-hwdb \
 	--disable-manpages \
 	--disable-hibernate \
-	--disable-ldconfig \
+	--$(call ptx/endis,PTXCONF_SYSTEMD_LDCONFIG)-ldconfig \
 	--enable-split-usr \
 	--disable-tests \
 	--disable-debug \
-- 
2.8.2


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