Bump version, add a check and a control for visibility

Add a check so cmsCreatedExtendedTransform behaves like other transform generators
Add a #define symbol to control visibility in linux. Useful if you want to create a so that contains lcms as static library.
Bump version number

include/lcms2.h

@@ -23,7 +23,7 @@
 //
 //---------------------------------------------------------------------------------
 //
-// Version 2.16
+// Version 2.17alpha0
 //
 
 #ifndef _lcms2_H
@@ -84,7 +84,7 @@ extern "C" {
 #endif
 
 // Version/release
-#define LCMS_VERSION        2160
+#define LCMS_VERSION        2170
 
 // I will give the chance of redefining basic types for compilers that are not fully C99 compliant
 #ifndef CMS_BASIC_TYPES_ALREADY_DEFINED
@@ -248,7 +248,7 @@ typedef int                  cmsBool;
 #     define CMSAPI
 #  endif
 #else  // not Windows
-#  ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY
+#  if defined(HAVE_FUNC_ATTRIBUTE_VISIBILITY) && !defined(CMS_NO_VISIBILITY)
 #     define CMSEXPORT
 #     define CMSAPI    __attribute__((visibility("default")))
 #  else

src/cmsxform.c

@@ -1131,7 +1131,15 @@ cmsHTRANSFORM CMSEXPORT cmsCreateExtendedTransform(cmsContext ContextID,
     cmsColorSpaceSignature EntryColorSpace;
     cmsColorSpaceSignature ExitColorSpace;
     cmsPipeline* Lut;
-    cmsUInt32Number LastIntent = Intents[nProfiles-1];
+    cmsUInt32Number LastIntent;
+
+    // Safeguard
+    if (nProfiles <= 0 || nProfiles > 255) {
+        cmsSignalError(ContextID, cmsERROR_RANGE, "Wrong number of profiles. 1..255 expected, %d found.", nProfiles);
+        return NULL;
+    }
+
+    LastIntent = Intents[nProfiles - 1];
 
     // If it is a fake transform
     if (dwFlags & cmsFLAGS_NULLTRANSFORM)