[Bug 611564] [NEW] sparkle fails to build with clang due to -Werror.\…

…n\nAlso, switching to Clang because hoorah.

Configurations/ConfigCommon.xcconfig

@@ -16,6 +16,7 @@ GCC_PREFIX_HEADER = $(SDKROOT)/System/Library/Frameworks/Cocoa.framework/Headers
 GCC_FAST_OBJC_DISPATCH = YES
 GCC_ENABLE_PASCAL_STRINGS = NO
 ARCHS = ppc i386 x86_64
+GCC_VERSION = com.apple.compilers.llvm.clang.1_0
 
 // Enable warnings
 GCC_WARN_CHECK_SWITCH_STATEMENTS = YES
@@ -46,4 +47,4 @@ GCC_WARN_UNUSED_VALUE = YES
 GCC_WARN_UNUSED_PARAMETER = YES
 GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES
 GCC_WARN_UNDECLARED_SELECTOR = YES
-WARNING_CFLAGS = -Wall -Wundef -Wendif-labels -Wpointer-arith -Wcast-align -Wwrite-strings -Wmissing-noreturn -Wmissing-format-attribute -Wpacked -Wredundant-decls -Winline -Wdisabled-optimization -Wformat=2 -Wlarger-than-32768 -Winvalid-pch
+WARNING_CFLAGS = -Wall -Wno-unused-parameter -Werror -Wundef -Wendif-labels -Wpointer-arith -Wcast-align -Wwrite-strings -Wmissing-format-attribute -Wpacked -Wredundant-decls -Winline -Wdisabled-optimization -Wformat=2 -Winvalid-pch

SUBinaryDeltaCommon.m

@@ -60,7 +60,7 @@ static void _hashOfFile(unsigned char* hash, FTSENT *ent)
 {
     if (ent->fts_info == FTS_SL) {
         char linkDestination[MAXPATHLEN + 1];
-        size_t linkDestinationLength = readlink(ent->fts_path, linkDestination, MAXPATHLEN);
+        ssize_t linkDestinationLength = readlink(ent->fts_path, linkDestination, MAXPATHLEN);
         if (linkDestinationLength < 0) {
             perror("readlink");
             return;