Reorder checks for libraries to allow ./configure LDFLAGS=-static.

[oweals/tinc.git] / m4 / openssl.m4

diff --git a/m4/openssl.m4 b/m4/openssl.m4
index 3fef464b55b7a5b06e2ec602b1c50c02a821707b..254ea4ff2424531ee06b430de374c22b1e063efe 100644 (file)
--- a/m4/openssl.m4
+++ b/m4/openssl.m4
@@ -1,54 +1,56 @@
 dnl Check to find the OpenSSL headers/libraries
 
-
-AC_DEFUN(tinc_OPENSSL,
+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="$withvall"]
-    )
-    AC_ARG_WITH(openssl-lib,
-      [  --with-openssl-lib=DIR  OpenSSL library directory],
-      [echo -ne 'libraries...'
-       openssl_lib="$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
-
+  case $host_os in
+    *mingw*)
+    ;;
+    *)
+      AC_CHECK_FUNC(dlopen,
+        [],
+        [AC_CHECK_LIB(dl, dlopen,
+          [LIBS="$LIBS -ldl"],
+          [AC_MSG_ERROR([OpenSSL depends on libdl.]); break]
+        )]
+      )
+    ;;
+  esac
+
+  AC_ARG_WITH(openssl,
+    AS_HELP_STRING([--with-openssl=DIR], [OpenSSL base directory, or:]),
+    [openssl="$withval"
+     CPPFLAGS="$CPPFLAGS -I$withval/include"
+     LDFLAGS="$LDFLAGS -L$withval/lib"]
+  )
+
+  AC_ARG_WITH(openssl-include,
+    AS_HELP_STRING([--with-openssl-include=DIR], [OpenSSL headers directory (without trailing /openssl)]),
+    [openssl_include="$withval"
+     CPPFLAGS="$CPPFLAGS -I$withval"]
+  )
+
+  AC_ARG_WITH(openssl-lib,
+    AS_HELP_STRING([--with-openssl-lib=DIR], [OpenSSL library directory]),
+    [openssl_lib="$withval"
+     LDFLAGS="$LDFLAGS -L$withval"]
+  )
+
+  AC_CHECK_HEADERS(openssl/evp.h openssl/rsa.h openssl/rand.h openssl/err.h openssl/sha.h openssl/pem.h openssl/engine.h,
+    [],
+    [AC_MSG_ERROR([OpenSSL header files not found.]); break]
+  )
+
+  AC_CHECK_LIB(crypto, EVP_EncryptInit_ex,
+    [LIBS="-lcrypto $LIBS"],
+    [AC_MSG_ERROR([OpenSSL libraries not found.])]
+  )
+
+  AC_CHECK_FUNCS([RAND_pseudo_bytes EVP_EncryptInit_ex], ,
+    [AC_MSG_ERROR([Missing OpenSSL functionality, make sure you have installed the latest version.]); break],
+  )
+
+  AC_CHECK_DECL([OpenSSL_add_all_algorithms], ,
+    [AC_MSG_ERROR([Missing OpenSSL functionality, make sure you have installed the latest version.]); break],
+    [#include <openssl/evp.h>]
+  )
 ])