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| <a name="Proposed-Extensions-1"></a> |
| <h3 class="section">Proposed Extensions</h3> |
| |
| <p>Here’s a list of proposed extensions for the GNU Fortran compiler, in no particular |
| order. Most of these are necessary to be fully compatible with |
| existing Fortran compilers, but they are not part of the official |
| J3 Fortran 95 standard. |
| </p> |
| <a name="Compiler-extensions_003a"></a> |
| <h4 class="subsection">Compiler extensions:</h4> |
| <ul> |
| <li> User-specified alignment rules for structures. |
| |
| </li><li> Automatically extend single precision constants to double. |
| |
| </li><li> Compile code that conserves memory by dynamically allocating common and |
| module storage either on stack or heap. |
| |
| </li><li> Compile flag to generate code for array conformance checking (suggest -CC). |
| |
| </li><li> User control of symbol names (underscores, etc). |
| |
| </li><li> Compile setting for maximum size of stack frame size before spilling |
| parts to static or heap. |
| |
| </li><li> Flag to force local variables into static space. |
| |
| </li><li> Flag to force local variables onto stack. |
| </li></ul> |
| |
| |
| <a name="Environment-Options"></a> |
| <h4 class="subsection">Environment Options</h4> |
| <ul> |
| <li> Pluggable library modules for random numbers, linear algebra. |
| LA should use BLAS calling conventions. |
| |
| </li><li> Environment variables controlling actions on arithmetic exceptions like |
| overflow, underflow, precision loss—Generate NaN, abort, default. |
| action. |
| |
| </li><li> Set precision for fp units that support it (i387). |
| |
| </li><li> Variable for setting fp rounding mode. |
| |
| </li><li> Variable to fill uninitialized variables with a user-defined bit |
| pattern. |
| |
| </li><li> Environment variable controlling filename that is opened for that unit |
| number. |
| |
| </li><li> Environment variable to clear/trash memory being freed. |
| |
| </li><li> Environment variable to control tracing of allocations and frees. |
| |
| </li><li> Environment variable to display allocated memory at normal program end. |
| |
| </li><li> Environment variable for filename for * IO-unit. |
| |
| </li><li> Environment variable for temporary file directory. |
| |
| </li><li> Environment variable forcing standard output to be line buffered (Unix). |
| |
| </li></ul> |
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