Define MODVERSION in a more reproducable way.

We define MODVERSION to make sure the libebl backend modules match the
elfutils build when we dlopen them. Using hostname and date makes it very
hard to create reproducable builds. Define them a little more reproducable
using LIBEBL_SUBDIR, eu_version and ac_cv_build.

Signed-off-by: Mark Wielaard <mjw@redhat.com>

diff --git a/ChangeLog b/ChangeLog
index c67894e..3444519 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2015-05-31  Mark Wielaard  <mjw@redhat.com>
 
+       * configure.ac (MODVERSION): Define using LIBEBL_SUBDIR, eu_version
+       and ac_cv_build.
+
+2015-05-31  Mark Wielaard  <mjw@redhat.com>
+
        * configure.ac (use_undefined): Use AC_LINK_IFELSE. AC_DEFINE
        CHECK_UNDEFINED.
 

diff --git a/configure.ac b/configure.ac
index 58366d5..f9fb5be 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -29,12 +29,6 @@ dnl We use GNU make extensions; automake 1.10 defaults to -Wportability.
 AM_INIT_AUTOMAKE([gnits 1.11 -Wno-portability dist-bzip2 no-dist-gzip parallel-tests])
 AM_MAINTAINER_MODE
 
-dnl Unique ID for this build.
-MODVERSION="Build on $(hostname) $(date +%FT%R:%S%z)"
-AC_SUBST([MODVERSION])
-AC_DEFINE_UNQUOTED(MODVERSION, "$MODVERSION")
-AH_TEMPLATE([MODVERSION], [Identifier for modules in the build.])
-
 AC_CONFIG_SRCDIR([libelf/libelf.h])
 AC_CONFIG_FILES([Makefile])
 AC_CONFIG_HEADERS([config.h])
@@ -388,6 +382,12 @@ esac
 # Round up to the next release API (x.y) version.
 eu_version=$(( (eu_version + 999) / 1000 ))
 
+dnl Unique ID for this build.
+MODVERSION="Build for ${LIBEBL_SUBDIR} ${eu_version} ${ac_cv_build}"
+AC_SUBST([MODVERSION])
+AC_DEFINE_UNQUOTED(MODVERSION, "$MODVERSION")
+AH_TEMPLATE([MODVERSION], [Identifier for modules in the build.])
+
 AC_CHECK_SIZEOF(long)
 
 # On aarch64 before glibc 2.20 we would get the kernel user_pt_regs instead