1. Product and Versions Concerned
The C/C++ compiler package for the M32R family
V.5.00 Release 00 and V.5.01 Release 00
2. Description
If a function-like macro that is spread over two or more lines takes the
same function-like macro as an argument, the latter may not be expanded.
2.1 Conditions
This problem occurs if the following conditions are all satisfied:
(1) A function-like macro statement is spread over two or more lines.
(2) The function-like macro in (1) takes the same function-like macro
as an argument.
(3) The function-like macro as an argument in (2) is placed in front
of a line or just follows comments or a sequence of white-space
characters in front of a line.
2.2 Example
Source file (sample1.c):
--------------------------------
#define SMP_MACRO(a,b) (a + b)
int var = SMP_MACRO(1, <- Condition (1)
SMP_MACRO(2,3)); <- Conditions (2) and (3)
--------------------------------
Result of macro replacement (output of cc32R -E sample1.c):
------------------------------------------------------------------------
#line 1 "sample1.c"
int var = (1 + SMP_MACRO(2,3)) ; /* SMP_MACRO(2,3) not expanded */
------------------------------------------------------------------------
3. Workarounds
Avoid the problem in either of the following ways:
(1) Concatenate the line containing the function-like macro as an
argument in (3) to the preceding line by placing a ¥ character at
the end of the preceding line.
Modification of sample1.c:
--------------------------------
#define SMP_MACRO(a,b) (a + b)
int var = SMP_MACRO(1, ¥ <- ¥ placed at the end of this line
SMP_MACRO(2,3));
--------------------------------
(2) Define another function-like macro with the same format and
a different name; then use it as an argument.
Modification of sample1.c:
------------------------------------
#define SMP_MACRO(a,b) (a + b)
#define SMP_SAME_MACRO(a,b) (a + b) <- Same format as SMP_MACRO
int var = SMP_MACRO(1,
SMP_SAME_MACRO(2,3)); <- SMP_MACRO replaced
------------------------------------
