Check for dlopen in standard libraries first (needed for DEC OSF).

[tinc] / m4 / openssl.m4

diff --git a/m4/openssl.m4 b/m4/openssl.m4
index 3fef464..d9f8e16 100644 (file)
--- a/m4/openssl.m4
+++ b/m4/openssl.m4
@@ -1,54 +1,39 @@
 dnl Check to find the OpenSSL headers/libraries
 
-
 AC_DEFUN(tinc_OPENSSL,
 [
-
-  AC_CACHE_CHECK([for openssl], tinc_cv_openssl_include,
-  [
-    AC_ARG_WITH(openssl,
-      [  --with-openssl=DIR      OpenSSL library and headers prefix],
-      [echo -ne 'prefix...'
-       openssl_lib="$withval/lib"
-       openssl_include="$withval/include"]
-    )
-    AC_ARG_WITH(openssl-include,
-      [  --with-openssl-include=DIR OpenSSL headers directory],
-      [echo -ne 'includes...'
-       openssl_include="$withvall"]
+  tinc_ac_save_CPPFLAGS="$CPPFLAGS"
+
+  AC_ARG_WITH(openssl-include,
+    [  --with-openssl-include=DIR  OpenSSL headers directory (without trailing /openssl)],
+    [openssl_include="$withval"
+     CFLAGS="$CFLAGS -I$withval"
+     CPPFLAGS="$CPPFLAGS -I$withval"]
+  )
+
+  AC_ARG_WITH(openssl-lib,
+    [  --with-openssl-lib=DIR  OpenSSL library directory],
+    [openssl_lib="$withval"
+     LIBS="$LIBS -L$withval"]
+  )
+
+  AC_CHECK_HEADERS(openssl/evp.h openssl/rsa.h openssl/rand.h openssl/err.h openssl/sha.h openssl/pem.h,
+    [],
+    [AC_MSG_ERROR("OpenSSL header files not found."); break]
+  )
+
+  CPPFLAGS="$tinc_ac_save_CPPFLAGS"
+
+  AC_CHECK_LIB(crypto, SHA1_version,
+    [LIBS="$LIBS -lcrypto"],
+    [AC_MSG_ERROR("OpenSSL libraries not found.")]
+  )
+
+  AC_CHECK_FUNC(dlopen,
+    [],
+    AC_CHECK_LIB(dl, dlopen,
+      [LIBS="$LIBS -ldl"],
+      [AC_MSG_ERROR("OpenSSL depends on libdl.")]
     )
-    AC_ARG_WITH(openssl-lib,
-      [  --with-openssl-lib=DIR  OpenSSL library directory],
-      [echo -ne 'libraries...'
-       openssl_lib="$withval"]
-    )
-
-if test "x$openssl_lib" != "x" ; then
-  LIBS="$LIBS -L$openssl_lib"
-fi
-if test "x$openssl_include" != "x" ; then
-  INCLUDES="$INCLUDES -I$openssl_include"
-fi
-
-AC_MSG_RESULT([done.])
-  ])
-
-libcrypto=none
-AC_CHECK_LIB(crypto, SHA1_version, [
-  libcrypto=yes
-])
-
-if test $libcrypto = none; then
-  AC_MSG_ERROR(
-[It seems like OpenSSL is not installed on this system.  But perhaps
-you need to supply the exact location of the headers and libraries.
-You can try running configure with the --with-openssl=/DIRECTORY
-parameter.  If you installed the headers and libraries in a different
-location you can use --with-openssl-include=/DIR and
---with-openssl-lib=/DIR.])
-
-else
-  LIBS="$LIBS -lcrypto"
-fi
-
+  )
 ])