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RENESAS TOOL NEWS on July 16, 2005: RSO-M3T-NC308WA_1-050716D
A Note on Using the C Compiler Packages
M3T-NC308WA and M3T-NC30WA
--On Defining More Than One Void Function-- |
Please take note of the following problem in using the C compiler packages M3T-NC308WA and M3T-NC30WA (they are used for the M16C family of MCUs):
- On defining more than one void function
- Products and Versions Concerned
- M3T-NC308WA V.5.00 Release 1 through V.5.20 Release 02
(for the M32C/90, M32C/80, and M16C/80 series of MCUs)
- M3T-NC30WA V.5.00 Release 1 through V.5.30 Release 02
(for the M16C/60, M16C/30, M16C/20, M16C/10, M16C/Tiny and R8C/Tiny series of MCUs)
- Description
Even when two or more void functions are placed in different sections in the C source program, optimization places them in one section after compilation.
- 2.1 Conditions
- This problem occurs if the following conditions are all satisfied:
| (1) |
One source file contains two or more void functions. |
| (2) |
The void functions in (1) are placed in more than one section. |
| (3) |
Any of the compile options -O3, -O4, -O5, -OR, and -OS is used. |
- 2.2 Example
-
---------------------------------------------------------------
void func_1(void) /* Condition (1) */
{
}
#pragma SECTION program prog /* Condition (2) */
void func_2(void) /* Condition (1) */
{
}
---------------------------------------------------------------
- Workaround
Insert a dummy asm() function into each of the void functions that are misplaced after compilation.
--------------------------------------------------------------------
void func_1(void)
{
}
#pragma SECTION program prog
void func_2(void)
{
asm(); /* Dummy asm() inserted */
}
--------------------------------------------------------------------
- Schedule of Fixing the Problem
We plan to fix this problem in the next release of the products.
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