Further advice please, re: Remaining problems compiling rinside_sample0.cpp on Xcode 5.1.1  on mavericks 10.9.4.

Dear Colleagues,
Following my earlier query (July 2014 Archive), I carefully followed and extensively trialled the helpful leads you gave.

In essence, you confirmed that the build failure was due to my having allowed a conflict to develop between String.h from Rcpp and string.h from the standard C library, so that at some points it was finding the wrong one of these two headers. The cumulated advice on this I gleaned was to avoid duplication of RCpp header paths offered in the search dialogue, and to use -idirafter to try to ensure that the R-associated headers are searched after the path containing the standard libstdc++. I did this, and got rid of the numerous errors that previously appeared early in the linking process. But now I still seem to have a residue of the problem appearing when the Rinside_sample0 main function gets into operation.

I would very much appreciate a further burst of advice on solving this remaining problem.

FIRST: here is the problem as shown by the error messages from Xcode:
Three 'Apple Mach-0 Linker (ld) Errors':
: "RInside::parseEvalQ(std::string const&)", referenced from:
 _main in rinside_sample0.o
: "RInside::operator[](std::string const&)", referenced from:
 _main in rinside_sample0.o
 Symbol(s) not found for architecture x86_64
Linker command failed with exit code 1 (use -v to see invocation)

And the detail:
 Ld /Users/RogerDean/Library/Developer/Xcode/DerivedData/rRinsideXcodetest2-cfwgtxcrotrppifdcdgmneurclwb/Build/Products/Debug/rRinsideXcodetest2 normal x86_64
    cd /Users/RogerDean/Desktop/RInside-test/rRinsideXcodetest2
    export MACOSX_DEPLOYMENT_TARGET=10.9
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk -L/Users/RogerDean/Library/Developer/Xcode/DerivedData/rRinsideXcodetest2-cfwgtxcrotrppifdcdgmneurclwb/Build/Products/Debug -L/Users/RogerDean/Desktop/RInside-test/rRinsideXcodetest2/rRinsideXcodetest2 -F/Users/RogerDean/Library/Developer/Xcode/DerivedData/rRinsideXcodetest2-cfwgtxcrotrppifdcdgmneurclwb/Build/Products/Debug -filelist /Users/RogerDean/Library/Developer/Xcode/DerivedData/rRinsideXcodetest2-cfwgtxcrotrppifdcdgmneurclwb/Build/Intermediates/rRinsideXcodetest2.build/Debug/rRinsideXcodetest2.build/Objects-normal/x86_64/rRinsideXcodetest2.LinkFileList -mmacosx-version-min=10.9 -stdlib=libstdc++ -lRlapack -lR -lRblas.0 -lRInside -Xlinker -dependency_info -Xlinker /Users/RogerDean/Library/Developer/Xcode/DerivedData/rRinsideXcodetest2-cfwgtxcrotrppifdcdgmneurclwb/Build/Intermediates/rRinsideXcodetest2.build/Debug/rRinsideXcodetest2.build/Objects-normal/x86_64/rRinsideXcodetest2_dependency_info.dat -o /Users/RogerDean/Library/Developer/Xcode/DerivedData/rRinsideXcodetest2-cfwgtxcrotrppifdcdgmneurclwb/Build/Products/Debug/rRinsideXcodetest2

Undefined symbols for architecture x86_64:
  "RInside::parseEvalQ(std::string const&)", referenced from:
      _main in rinside_sample0.o
  "RInside::operator[](std::string const&)", referenced from:
      _main in rinside_sample0.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

so it seems still to be an issue to do with string operation as far as I can tell. I have tried a range of the architecture options, and currently have 'Native Architecture (x86-64)' as the choice.

SECOND, here are the places in Xcode and details of the paths I am currently providing (I have tried a range of alternative sites for placing these paths and directives in the Xcode build settings, that either worsened or did not change the outcome):
************
The 'system' paths:
//:configuration = Debug
HEADER_SEARCH_PATHS = /$(inherited) /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include

//:configuration = Release
HEADER_SEARCH_PATHS = /$(inherited) /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include

//:completeSettings = some
HEADER_SEARCH_PATHS

the 'R' paths:
I have tried these in "User header search paths" with "Always search user paths" = YES, with similar results. The Xcode guidance on Always search user paths seems unclear, and also inconsistent with the idea of the -idirafter directive, so I currently have these R paths in "Other C++ Flags" as follows:

//:configuration = Debug
OTHER_CPLUSPLUSFLAGS = -idirafter/Library/Frameworks/R.framework/Versions/3.1/Resources/library/RInside/include -idirafter/Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/include
-idirafter/Library/Frameworks/R.framework/Versions/3.1/Resources/include

//:configuration = Release
OTHER_CPLUSPLUSFLAGS = -idirafter/Library/Frameworks/R.framework/Versions/3.1/Resources/library/RInside/include -idirafter/Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/include
-idirafter/Library/Frameworks/R.framework/Versions/3.1/Resources/include

//:completeSettings = some
OTHER_CPLUSPLUSFLAGS

***********
Third, there is also the direction to use the particular libstdc++ library, and the restriction of macosx types. These I have currently placed in OTHER_CODE_SIGN_FLAGS:

//:configuration = Debug
OTHER_CODE_SIGN_FLAGS = -stdlib=libstdc++ -mmacosx-version-min=10.6

//:configuration = Release
OTHER_CODE_SIGN_FLAGS = -stdlib=libstdc++ -mmacosx-version-min=10.6

//:completeSettings = some
OTHER_CODE_SIGN_FLAGS

NB Judging by the detail above, the latter part is getting over-ridden somehow so min=10.9.

Finally, I'll confirm that I also have set up the .R/Makevars according to the best advice I could again glean from your comments, the related SO posts,  and my searches, dealing particularly with selecting the clang++ compiler. As you see above, I chose to put the -idirafter directives into the Xcode settings rather than in Makevars, which seemed more appropriate since I think these directives to some degree specific to this R project and not general to all R projects. I did also try placing all the -idirafter paths in Makevars, without any improvement. Here is my current .R/Makevars:
CC=clang
CXX=clang++
CFLAGS="-mtune=native -g -O2 -Wall -pedantic -Wconversion"
CXXFLAGS="-stdlib=libstdc++ -mmacosx-version-min=10.6 -mtune=native -g -O3 -Wall -pedantic -Wconversion"
FLIBS=-lgfortran
F77="gfortran-4.2 -arch x86_64"
FC=$F77
OBJC=clang
So I do have some duplication, but as the specs are the same I assume this will function as a safeguard. Again, I have fiddled with most of these permutations.

A subsidiary question I have is whether the libR.dylib and libRInside.dylib are actually needed in the Xcode project, or whether they will/should be built during the compiling?

I am hoping another round of advice from you experts might allow me to solve my remaining problem. Many thanks again in advance for your advice and time.

Roger Dean
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