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RENESAS TOOL NEWS on September 16, 2004: RSO-M3T-CC32R-040916D
A Note on Using
C Compiler Package M3T-CC32R
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Please take note of the following problem in using the M3T-CC32R,
a C-compiler package for the M32 family of MCUs:
- On initializing a two-dimensional array of type char using an initializer
- Versions Concerned
M3T-CC32R V.1.00 Release 1 through V.4.30 Release 00
- Description
If a two-dimensional array of type char is declared and at the same
time initialized using a specific type of initializer that contains
string literals, the compiler will tell the following error message:
cg32r: "xxxx", line XX: internal error: illegal IL, size of
initializer is larger than name size.
Here, xxxx and XX denote a file name and a line number respectively.
- 2.1 Conditions
- This problem occurs if the following conditions are all satisfied:
| (1) | A two-dimensional array of type char (except for type pointer) is declared with an initializer. |
| (2) | In the declaration of the array in (1), its size is neglected. |
| (3) | The initializer in (1) contains two or more string literals (for example, "ab" and "cd"). |
| (4) | Among the string literals in (3), the first is enclosed with braces. |
- 2.2 Examples
1. Statically Initialized Array
Source file: sample1.c
-----------------------------------------------------------------------
char array1[][2] = { /* Conditions (1) and (2) */
{"ab"}, /* Conditions (3) and (4) */
"cd", /* Condition (3) */
"ef" /* Condition (3) */
};
-----------------------------------------------------------------------
2. Dynamically Initialized Array
Source file: sample2.c
-----------------------------------------------------------------------
extern void array_func(char [][6]);
void func2(void)
{
char array2[][6] = { /* Conditions (1) and (2) */
{"5678"}, /* Conditions (3) and (4) */
{"1234"}, /* Condition (3) */
};
array_func(array2);
}
-----------------------------------------------------------------------
- Workaround
This problem can be circumvented in either of the following ways:
| (1) |
Specify the size of the array.
Circumvention of source file sample1.c
-----------------------------------------------------------------------
char array1[3][2] = { /* Size of 3 specified */
{"ab"},
"cd",
"ef"
};
-----------------------------------------------------------------------
Circumvention of source file sample2.c
-----------------------------------------------------------------------
extern void array_func(char [][6]);
void func2(void)
{
char array2[2][6] = { /* Size of 2 specified */
{"5678"},
{"1234"},
};
array_func(array2);
}
-----------------------------------------------------------------------
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| (2) |
Remove the braces enclosing the first string literal.
Circumvention of source file sample1.c
-----------------------------------------------------------------------
char array1[][2] = {
"ab", /* Braces removed */
"cd",
"ef"
};
-----------------------------------------------------------------------
Circumvention of source file sample2.c
-----------------------------------------------------------------------
extern void array_func(char [][6]);
void func2(void)
{
char array2[][6] = {
"5678", /* Braces removed */
{"1234"},
};
array_func(array2);
}
-----------------------------------------------------------------------
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- Schedule of Fixing the Problem
We plan to fix this problem in our next release of the product.
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