[MacPorts] CompilerSelection modified

[MacPorts Wiki]

Page "CompilerSelection" was changed by MarcusCalhoun-Lopez
Diff URL: <https://trac.macports.org/wiki/CompilerSelection?action=diff&version=8>
Revision 8
Changes:
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Index: CompilerSelection
=========================================================================
--- CompilerSelection (version: 7)
+++ CompilerSelection (version: 8)
@@ -77,8 +77,23 @@
 None of the compilers provided by Xcode implement [https://en.wikipedia.org/wiki/Message_Passing_Interface MPI].
 To implement it, [https://en.wikipedia.org/wiki/MPICH MPICH] and [https://en.wikipedia.org/wiki/Open_MPI Open MPI] provide wrappers for Clang, GCC, and Xcode.
 
-The compilers provided by Xcode only support [https://en.wikipedia.org/wiki/Thread-local_storage thread-local storage] if the OS supports it, which did not happen until [https://en.wikipedia.org/wiki/Mac_OS_X_Lion Mac OS X Lion].
+The compilers provided by Xcode only support [https://en.wikipedia.org/wiki/Thread-local_storage thread-local storage] if the OS supports it, which did not happen until [https://en.wikipedia.org/wiki/Mac_OS_X_Lion Mac OS X Lion].\\
 GCC and Clang can emulate thread-local storage even on versions of macOS that do not support it.
+
+=== Environment Variables ===
+To a limited extent, the behavior of compilers can also be controlled with [https://en.wikipedia.org/wiki/Environment_variable environment variables] instead of [https://en.wikipedia.org/wiki/Command-line_interface#Command-line_option switches].\\
+However, not all compilers support all environment variables.
+
+||= Variable =||= Xcode Support =||= Clang Support =||= GCC Support =||
+|| CPATH || Xcode 4.3 for Clang\\Apple clang version 3.1 (tags/Apple/clang-318.0.45 (based on LLVM 3.1svn);\\all GCC versions || all available from MacPorts || all available from MacPorts ||
+|| LIBRARY_PATH || Xcode 4.4 for Clang\\Apple clang version 4.0 (tags/Apple/clang-421.0.57) (based on LLVM 3.1svn);\\all GCC versions || all available from MacPorts || all available from MacPorts ||
+|| MACOSX_DEPLOYMENT_TARGET || all || all available from MacPorts || all available from MacPorts ||
+|| SDKROOT || OSX 10.9 (existence of /usr/lib/libxcselect.dylib) || all available from MacPorts || [https://github.com/macports/macports-ports/commit/dd197967ac1c9fb9b489ee4e347a2f5a859f9839 version 7], [https://github.com/macports/macports-ports/pull/6083 version 8], [https://github.com/macports/macports-ports/commit/1850136d289019f3b29a5b24d3ec8ef9b23913ee version 9+] ||
+|| DEVELOPER_DIR || OSX 10.9 (existence of /usr/lib/libxcselect.dylib) || N/A || N/A ||
+|| CC_PRINT_OPTIONS || all || all available from MacPorts || all available from MacPorts ||
+|| CC_PRINT_OPTIONS_FILE || all || all available from MacPorts || all available from MacPorts ||
+
+See CompilerEnvironmentVariables for descriptions of the environment variables.
 
 === C++ Standard Library ===
 There are three possible [https://en.wikipedia.org/wiki/C%2B%2B_Standard_Library C++ standard libraries] on macOS.
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