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MESC TOOL NEWS:
MESCT-NC308WA_1-000201D
NC308WA, NC30WA, NC79WA, NC77WA
Precautions
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Please take note of the following problem in using C compilers (with assembler and integrated development environment) NC308WA, NC30WA, NC79WA, and NC77WA:
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Products Concerned
- C compiler for the M16C/80 series MCUs:
NC308WA V.1.00 Release 1 -- V.2.00 Release 1
- C compiler for the M16C/60 and M16C/20 series MCUs:
NC30WA V.2.00 Release 1 -- V.3.20 Release 1
- C compiler for the 7900 series MCUs:
NC79WA V.2.00 Release 1 -- V.3.20 Release 1
- C compiler for the 77xx series MCUs:
NC77WA V.4.00 Release 1 -- V.5.20 Release 1
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Problem
When programs containing variables that are declared to be "const" are compiled, system errors may arise.
- 2.1 Conditions
- This problem occurs if the following two conditions are satisfied:
- (1) A variable declared to be "const" is assigned the initial value enclosed in curly braces {}.
- Note that these braces for initializing aggregates, such as an array, are irrelevant to this problem.
- (2) Any of optimizing options "-Oconst", "-O4", and "-O5" is used at compilation.
- 2.2 Example
-----------------------------------------------------------------
const int a={0x0001};
main()
{
int i=a;
}
-----------------------------------------------------------------
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Workaround
When declaring variables to be "const", initialize them without {}.
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Schedule of Fixing Problem
We plan to fix this problem in our next release.
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