[[ Bug 23234 ]] Fix iOS standalone build error when running from source

This patch fixes the error:

Failed to open macho file at
/../Xcodes/Xcode_12_5_0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
for reading: Too many levels of symbolic links

It seems there is a chance g++ is not symlinked correctly, so use the full path to clang++ instead.

ide-support/revsaveasiosstandalone.livecodescript

@@ -535,7 +535,11 @@ private command revSaveAsMobileStandaloneMain pStack, pAppBundle, pTarget, pSett
             -- MM-2013-09-23: [[ iOS7 Support ]] Use g++ instead of llvm-g++-4.2. XCode 5.0 uses llvm 5.0.
             -- g++ appears to be sym-linked to the appropriate compiler in all SDKS.
             -- SN-2015-02-19: [[ Bug 14625 ]] The minimum iOS version is bound to the architecture
-            get shell("g++ -arch " & tArch && "-miphoneos-version-min=" & tiPhoneMinVersion[tArch] && " -w " & quote & "@" & tLinkOptionsFile & quote)
+
+            -- PM-2021-06-10: [[ Bug 23234 ]] g++ might not be symlinked correctly, so use full path to clang++ instead
+            local tCommand
+            put tSdkRoot & "/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++" into tCommand
+            get shell(tCommand & " -arch " & tArch && "-miphoneos-version-min=" & tiPhoneMinVersion[tArch] && " -w " & quote & "@" & tLinkOptionsFile & quote)
 
             put tArchSpecificEngineFile & space after tArchSpecificEngineList
             delete file tLinkOptionsFile