File 0005-autotools-choose-engine-plugin-name-based-on-OpenSSL.patch of Package openssl_tpm_engine

From 1e411dced371babfda2dc29cfc86bfc844f23f05 Mon Sep 17 00:00:00 2001
From: Matthias Gerstner <matthias.gerstner@suse.de>
Date: Fri, 1 Dec 2017 17:27:18 +0100
Subject: [PATCH] autotools: choose engine plugin name based on OpenSSL version

In OpenSSL 1.1 engines are no longer prefixed with "lib" and also won't
be found if installed as lib<engine>.so. So this change checks for the
OpenSSL version we're compiling against and conditionally sets up
libtpm.so or just tpm.so.
---
 Makefile.am  | 27 +++++++++++++++++++++++----
 configure.in | 19 +++++++++++++++++++
 2 files changed, 42 insertions(+), 4 deletions(-)

Index: openssl_tpm_engine-0.4.2/Makefile.am
===================================================================
--- openssl_tpm_engine-0.4.2.orig/Makefile.am
+++ openssl_tpm_engine-0.4.2/Makefile.am
@@ -2,13 +2,32 @@ SUBDIRS=. test
 
 EXTRA_DIST = README  openssl.cnf.sample
 
-openssl_engine_LTLIBRARIES=libtpm.la
 bin_PROGRAMS=create_tpm_key
 openssl_enginedir=@libdir@/openssl/engines
 
-libtpm_la_LIBADD=-lcrypto -lc -ltspi
-libtpm_la_SOURCES=e_tpm.c e_tpm.h e_tpm_err.c
-libtpm_la_LDFLAGS=-avoid-version -module -shared -export-dynamic
+engine_libs=-lcrypto -lc -ltspi
+engine_sources=e_tpm.c e_tpm.h e_tpm_err.c
+engine_ldflags=-avoid-version -module -shared -export-dynamic
+
+# in OpenSSL 1.1 engine modules have been stripped of the lib prefix so we
+# need to adust the library name accordingly.
+#
+# sadly there seems to be no elegant way to change the library name based on a
+# configure check outcome, so we have to explicitly define both variants like
+# this
+if OPENSSL_11
+engine_base=tpm.la
+tpm_la_LIBADD=$(engine_libs)
+tpm_la_LDFLAGS=$(engine_ldflags)
+tpm_la_SOURCES=$(engine_sources)
+else
+engine_base=libtpm.la
+libtpm_la_LIBADD=$(engine_libs)
+libtpm_la_LDFLAGS=$(engine_ldflags)
+libtpm_la_SOURCES=$(engine_sources)
+endif
+
+openssl_engine_LTLIBRARIES=$(engine_base)
 
 create_tpm_key_SOURCES=create_tpm_key.c
 create_tpm_key_LDADD=-ltspi -lcrypto
Index: openssl_tpm_engine-0.4.2/configure.in
===================================================================
--- openssl_tpm_engine-0.4.2.orig/configure.in
+++ openssl_tpm_engine-0.4.2/configure.in
@@ -51,6 +51,25 @@ AC_USE_SYSTEM_EXTENSIONS
 AC_SYS_LARGEFILE
 AC_PROG_LIBTOOL
 
+AC_MSG_CHECKING([for OpenSSL 1.1])
+AC_TRY_COMPILE(
+    [#include <openssl/opensslv.h>],
+    [
+	    #if OPENSSL_VERSION_NUMBER < 0x1010000fL
+	    #	error "old ssl"
+	    #else
+	    #   warning "new openssl"
+	    #endif
+    ],
+    [AC_MSG_RESULT(yes)
+    openssl_11=true
+    ],
+    [AC_MSG_RESULT(no)
+    openssl_11=false
+    ]
+)
+AM_CONDITIONAL([OPENSSL_11], [test x$openssl_11 = xtrue])
+
 CFLAGS="$CFLAGS -Wall"
 AC_SUBST(CFLAGS)