Running configure always touches xtables/xtables-version.h, which
causes parts to rebuild even when the configuration has not changed.
(`./configure; make; ./configure; make;`).
This can be avoided if the AC_CONFIG_FILES mechanism is replaced by
one that does a compare and leaves an existing xtables-version.h
unmodified if the sed result stays the same when it re-runs.
Signed-off-by: Jan Engelhardt <jengelh@xxxxxxx>
---
Makefile.am | 8 ++++++--
configure.ac | 1 -
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/Makefile.am b/Makefile.am
index 799bf8b8..2e29bb5d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -29,5 +29,9 @@ tarball:
tar -C /tmp -cjf ${PACKAGE_TARNAME}-${PACKAGE_VERSION}.tar.bz2 --owner=root --group=root ${PACKAGE_TARNAME}-${PACKAGE_VERSION}/;
rm -Rf /tmp/${PACKAGE_TARNAME}-${PACKAGE_VERSION};
-config.status: extensions/GNUmakefile.in \
- include/xtables-version.h.in
+config.status: extensions/GNUmakefile.in
+
+include/xtables-version.h: include/xtables-version.h.in
+ ${AM_V_GEN} sed -e 's|@@libxtables_vmajor@@|${libxtables_vmajor}|g' <$< >include/.xtables-version.tmp; \
+ cmp include/xtables-version.h include/.xtables-version.tmp || \
+ mv include/.xtables-version.tmp include/xtables-version.h
diff --git a/configure.ac b/configure.ac
index c922f7a0..2767c911 100644
--- a/configure.ac
+++ b/configure.ac
@@ -245,7 +245,6 @@ AC_CONFIG_FILES([Makefile extensions/GNUmakefile include/Makefile
libiptc/Makefile libiptc/libiptc.pc
libiptc/libip4tc.pc libiptc/libip6tc.pc
libxtables/Makefile utils/Makefile
- include/xtables-version.h
iptables/xtables-monitor.8
utils/nfnl_osf.8
utils/nfbpf_compile.8])
--
2.21.0
