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RENESAS TOOL NEWS on September 16, 2004: RSO-M3T-NC308WA_1-040916D
A Note on Using C Compiler Packages
M3T-NC308WA and M3T-NC30WA
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Please take note of the following problem in using the M3T-NC308WA and
M3T-NC30WA C-compiler packages with an assembler and integrated development
environment:
- On using the near or far qualifier
- Products and Versions Concerned
C compiler packages for the M32C/80, and M16C/80 series of MCUs
M3T-NC308WA V.5.00 Release 1 through V.5.20 Release 1
C compiler packages for the M16C/60, M16C/30, M16C/Tiny, M16C/20,
M16C/10, and R8C/Tiny series of MCUs
M3T-NC30WA V.5.00 Release 1 through V.5.30 Release 1
- Description
If a near or far qualifier is placed in front of a function type System Error may arise.
- 2.1 Conditions
- This problem occurs if the following conditions are all satisfied:
| (1) | A function type A (for instance, "sample" in Example below) is declared to be typedef. |
| (2) | The function type A in (1) is also declared to be a pointer. |
| (3) | In front of another function type B pointed to by the pointer in (2) (for instance, "func" in Example below) is placed a near or far qualifier. |
- 2.2 Example
-------------------------------------------------------------
typedef void sample (int, int); /* Condition (1) */
sample far * func; /* Conditions (2) and (3) */
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- Workaround
This problem can be circumvented in either of the following ways:
| (1) |
Don't qualify the function type B as near or far.
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typedef void sample (int, int);
sample * func;
------------------------------------------------------------- |
| (2) |
Qualify the function type A as near or far at its typedef declaration.
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typedef void far sample (int, int);
sample far * func;
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- Schedule of Fixing the Problem
We plan to fix this problem in our next release of the products.
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