[Stdcxx Wiki] Update of "Compilers" by MartinSebor

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The following page has been changed by MartinSebor:
http://wiki.apache.org/stdcxx/Compilers

The comment on the change is:
Added an outline of a page on compiler resources.

New page:
= Compiler Resources =

== GCC ==

=== Online References ===
=== Predefined Macros ===

||MACRO||GCC OPTION||VERSION||DESCRIPTION||
||`__GNUC__`|| ||all||Defined to the major version of the compiler.||
||`__GNUC_MINOR__`|| ||all||Defined to the minor version of the compiler.||
||`__GNUC_PATCHLEVEL__`|| ||all||Defined to the micro (patch) version of the compiler.||
||`__GNUG__`|| ||all||Defined to the same value as `__GUNC__` for C++ code.||

=== Discussion Forums ===
=== Bug Reports ===

== HP aCC ==

=== Online References ===
=== Predefined Macros ===

See the [http://docs.hp.com/en/10946/preprocess.htm#macropredef Predefined Macros] section of the [http://docs.hp.com/en/10946/index.htm HP aCC 6 Programmers Guide] for a (possibly) incomplete list of macros predefined by the compiler.

Starting with HP aCC 6.15, the compiler supports the [http://docs.hp.com/en/10946/options.htm#opt-dM -dM] option to list the #define directives the preprocessor encounters as it translates a file.

See also the Bjørn Reese's list of [http://predef.sourceforge.net/precomp.html#sec16 Pre-defined Compiler Macros].

||MACRO||HP aCC OPTION||VERSION||DESCRIPTION||
||`__HP_aCC`|| ||all||Defined to the version of the compiler in the format `MMmmuu` (2 digits for each of major, minor, and micro).||
||`__hpux`|| ||all||Defined on all HP-UX versions.||
||`__ia64`|| ||5, 6||Defined on HP IPF hardware.||
||`__hppa`|| ||1, 3||Defined on PA-RISC hardware.||
||`__unix`|| ||all||Defined on all HP-UX versions.||
||`_BIG_ENDIAN`|| ||all||Defined on Big Endian versions of HP-UX (both IPF and PA-RISC).||
||`_ILP32`||[http://docs.hp.com/en/10946/options.htm#opt+DDdata_model +DD32]||all||Defined when +DD32 is in effect.||
||`_LP64`, `__LP64__`||[http://docs.hp.com/en/10946/options.htm#opt+DDdata_model +DD64]||all||Defined when +DD64 is in effect.||
||`__HPACC_NOEH`||[http://docs.hp.com/en/10946/options.htm#opt+noeh +noeh]||all||Defined when exceptions are disabled.||
||`_HPUX_SOURCE`, `__STDC_EXT__`||[http://docs.hp.com/en/10946/options.htm#opt-ext -ext]||all||Defined when extensions are enabled.||
||`_FPWIDETYPES`||[http://docs.hp.com/en/10946/options.htm#opt-nofpwidetypes -fpwidetypes]|| ||Defined when extended and quad floating-point data types including `__float80` are enabled.||
||`_REENTRANT`||[http://docs.hp.com/en/10946/options.htm#opt-mt -mt]||all||Defined when compiling for thread safety.||
||`_POSIX_C_SOURCE=199506L`||[http://docs.hp.com/en/10946/options.htm#opt-mt -mt]||all|| ||
||`_HPUX_SOURCE`||[http://docs.hp.com/en/10946/options.htm#opt-mt -mt]||all || ||
||`_THREAD_SAFE`||[http://docs.hp.com/en/10946/options.htm#opt-AP -AP] [http://docs.hp.com/en/10946/options.htm#opt-mt -mt]||all|| ||
||`_HP_NAMESPACE_STD`||[http://docs.hp.com/en/10946/options.htm#opt-AA -AA]|| ||Defined when the C++ Standard Library is declared in `namespace std`.||

=== Discussion Forums ===
=== Bug Reports ===


== IBM XLC/C++ ==

=== Online References ===
=== Predefined Macros ===
=== Discussion Forums ===
=== Bug Reports ===


== Intel C++ ==

=== Online References ===
=== Predefined Macros ===
=== Discussion Forums ===
=== Bug Reports ===


== SGI MIPSpro ==

=== Online References ===
=== Predefined Macros ===
=== Discussion Forums ===
=== Bug Reports ===


== Sun C++ ==

=== Online References ===
=== Predefined Macros ===
=== Discussion Forums ===
=== Bug Reports ===

== Microsoft Visual Studio ==

=== Online References ===
=== Predefined Macros ===
=== Discussion Forums ===
=== Bug Reports ===

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