Open Radar

 
Summary:
In the Xcode 6.3 version of the OS X 10.10 SDK, and in the Command Line Tools for Xcode 6.3 package, many headers in libc++ unconditionally #include <__debug>. Because the __debug header is not included with the shipped headers, it is not possible to build C++ software which uses these headers.

Affected headers are:

__hash_table
algorithm
experimental/optional
experimental/string_view
iterator
list
string
unordered_map
unordered_set
vector

In Xcode 6.2, the __debug #include statement was conditional on #ifdef _LIBCPP_DEBUG, but in Xcode 6.3 they are unconditional.

Steps to Reproduce:
1. Create a file named test.cpp with the following contents:
#include <iterator>

int main() {}

2. Run: clang++ test.cpp -o test

Expected Results:
The test program compiles.

Actual Results:
clang++ fails with the following error:

In file included from test.cpp:1:
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/iterator:341:10: fatal error: '__debug' file not found
#include <__debug>
         ^
1 error generated.

Version:
Command Line Tools 6.3.0.0.1.1428348375
ProductVersion:	10.10.3
BuildVersion:	14D131

Notes:


Configuration:
Tested on OS X 10.10.3 using the Command Line Tools for Xcode 6.3; I can also confirm this occurs on OS X 10.10.3 with Xcode 6.3.