Changes between Version 7 and Version 8 of CompilerSelection

Timestamp:

Jan 28, 2020, 11:52:51 AM (4 years ago)

Author:

MarcusCalhoun-Lopez (Marcus Calhoun-Lopez)

Comment:

--

CompilerSelection

@@ -78 +78 @@
 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 ===