Configuration: produce include/openssl/configuration.h when configuring

The goal is to avoid having too much of the OpenSSL source rebuilt
because include/openssl/configuration.h, or even because it was a
Makefile target that was called upon (some make implementations
consider the use of a target as an update of that target, even if it
wasn't really updated).

To resolve this, we move the production of include/openssl/configuration.h
to configdata.pm, and only update it if there were any actual changes.

Fixes #16377

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
(Merged from https://github.com/openssl/openssl/pull/16378)

(cherry picked from commit 2522889620446f1e56338367d1b6b028ea952bb4)

1 files changed, 5 insertions, 2 deletions

diff --git a/Configure b/Configure
index f5bbd8ba8e..d274a9e67d 100755
--- a/Configure
+++ b/Configure
@@ -2864,8 +2864,11 @@ if (-f $configdata_outname) {
         # like nothing happened
         unlink "$configdata_outname.new";
 
-        # We still run configdata.pm if the build file (Makefile) is missing
-        $run_configdata = !( -f $target{build_file} );
+        # We still run configdata.pm if one of the build file (Makefile) or
+        # the configuration header file are missing
+        $run_configdata =
+            !( -f $target{build_file} )
+            || !( -f catfile('include', 'openssl', 'configuration.h') );
     }
 } else {
     $update_configdata = 1;