There is an overlap in error message numbers emitted by the compiler for Alpha and for x86 platforms. It is important to note that messages emitted by the Alpha compiler are accurate. In most cases, these messages are self-explanatory. However, if you look up any of the message numbers listed below in the online documentation, you find explanatory text that is applicable only to the x86 compiler.
The following table details the error messages emitted by the Alpha and x86 compilers. For each error, the Alpha number and message are listed first, followed by the x86 compiler message.
Note Variable information has been replaced with the characters “xx.”
| Error number | Error Message |
| 1001 | Internal compiler error. Failed Assertion at line xx. |
| 1001 | INTERNAL COMPILER ERROR. Compiler file xx, line xx. Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information |
| 1002 | System Assertion. |
| 1002 | Compiler is out of heap space in pass 2. |
| 1003 | Must supply -il switch. |
| 1003 | Error count exceeds xx; stopping compilation. |
| 1004 | Must supply -source or -f switch to create source listing. |
| 1004 | Unexpected end-of-file found. |
| 1005 | ex Stack Empty. |
| 1005 | String too big for buffer. |
| 1006 | ex Stack Overflow. |
| 1006 | Write error on compiler intermediate file. |
| 1007 | End-of-file P1/P2 IL list. |
| 1007 | Unrecognized flag xx in xx. |
| 4701 | Code can never be executed at label xx. |
| 4701 | Local variable xx may be used without having been initialized. |
| 4702 | Variable xx is fetched, not initialized. |
| 4702 | Unreachable code. |
| 4703 | Address of a pass-by-value parameter xx was taken. |
| 4703 | xx function too large for global optimizations. |
| 4704 | Number of actual and formal parameters inconsistent in xx. |
| 4704 | xx in-line assembler precludes global optimizations. |
| 4705 | Type of actual argument inconsistent with formal parameter declaration in xx. |
| 4705 | Statement has no effect |
| 4706 | Missing actual argument for corresponding formal xx. |
| 4706 | Assignment within conditional expression. |
| 4707 | Argument passing mechanism does not match formal parameter mechanism for xx. |
| 4707 | xx function too large for global optimizations (xx). |
| 4708 | Routine xx can never be called. |
| 4708 | Ran out of heap at xx. |
| 4712 | Ignoring system register specified in routine's linkage. |
| 4712 | xx used as register - loss of debugging information. |
| 4726 | Volatile access appears unaligned, but must be aligned at run-time to ensure atomicity and byte granularity. |
| 4726 | xx unknown memory-model command-line option. |