Ensure that bootstrapped users of QCryptographicHash only use SHA-1

This reduces code size quite considerably in the bootstrapped tools.

Change-Id: I7475650b1936e93afcf327cb4def2f7763609179
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>

src/corelib/tools/qcryptographichash.cpp

@@ -45,6 +45,10 @@
 
 #include "../../3rdparty/sha1/sha1.cpp"
 
+#if defined(QT_BOOTSTRAPPED) && !defined(QT_CRYPTOGRAPHICHASH_ONLY_SHA1)
+#  error "Are you sure you need the other hashing algorithms besides SHA-1?"
+#endif
+
 #ifndef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
 // qdoc and qmake only need SHA-1
 #include "../../3rdparty/md5/md5.h"

src/corelib/tools/qcryptographichash.h

@@ -55,9 +55,12 @@ class Q_CORE_EXPORT QCryptographicHash
 {
 public:
     enum Algorithm {
+#ifndef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
         Md4,
         Md5,
-        Sha1,
+#endif
+        Sha1 = 2,
+#ifndef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
         Sha224,
         Sha256,
         Sha384,
@@ -66,6 +69,7 @@ public:
         Sha3_256,
         Sha3_384,
         Sha3_512
+#endif
     };
 
     explicit QCryptographicHash(Algorithm method);