My clang now doesn't complain about !"foo".

src/utils/ios/SkFontHost_iOS.mm

 #import <UIKit/UIKit.h>
 
 #include "SkStream_NSData.h"
 #include "SkTypeface.h"
 #include "SkFontHost.h"
 #include "SkThread.h"
 #include "SkTemplates.h"
 
 enum FontDesign {
     kUnknown_Design,
@@ skipping 154 matching lines @@
         }
         if (bestIndex >= 0) {
             return ref_and_return(gFonts[bestIndex]);
         }
     }
 
     return ref_and_return(get_default_font(style));
 }
 
 SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream* stream) {
-    SkASSERT(!"SkFontHost::CreateTypeface unimplemented");
+    SkDEBUGFAIL("SkFontHost::CreateTypeface unimplemented");
     return NULL;
 }
 
 SkTypeface* SkFontHost::CreateTypefaceFromFile(char const*) {
-//    SkASSERT(!"SkFontHost::CreateTypefaceFromFile unimplemented");
+//    SkDEBUGFAIL("SkFontHost::CreateTypefaceFromFile unimplemented");
     return NULL;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkStream* SkFontHost::OpenStream(uint32_t uniqueID) {
     SkTypeface_Stream* tf = find_by_id(uniqueID);
     SkASSERT(tf);
     return tf->refStream();
 }
 
 size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length,
                                int32_t* index) {
     SkDebugf("SkFontHost::GetFileName unimplemented\n");
     return 0;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) {
-    SkASSERT(!"SkFontHost::Serialize unimplemented");
+    SkDEBUGFAIL("SkFontHost::Serialize unimplemented");
 }
 
 SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
     int style = stream->readU8();
     int len = stream->readPackedUInt();
     const char* name = NULL;
     if (len > 0) {
         SkString str;
         str.resize(len);
         stream->read(str.writable_str(), len);
@@ skipping 30 matching lines @@
 
 void SkFontHost::GetGammaTables(const uint8_t* tables[2]) {
     tables[0] = NULL;   // black gamma (e.g. exp=1.4)
     tables[1] = NULL;   // white gamma (e.g. exp= 1/1.4)
 }
 
 // static
 SkAdvancedTypefaceMetrics* SkFontHost::GetAdvancedTypefaceMetrics(
                                                                   uint32_t fontID,
                                                                   SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo) {
-    SkASSERT(!"SkFontHost::GetAdvancedTypefaceMetrics unimplemented");
+    SkDEBUGFAIL("SkFontHost::GetAdvancedTypefaceMetrics unimplemented");
     return NULL;
 }
 
 void SkFontHost::FilterRec(SkScalerContext::Rec* rec, SkTypeface*) {
 }
 
 SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) {
-    SkASSERT(!"SkFontHost::CreateScalarContext unimplemented");
+    SkDEBUGFAIL("SkFontHost::CreateScalarContext unimplemented");
     return NULL;
 }