bugTiny C Compiler - Bugs: bug #53961, #if-block bodies, when expanded as...

 
 

bug #53961: #if-block bodies, when expanded as macro arguments incorrect if #if argument has a macro in it

Submitter:  None
Submitted:  Wed 23 May 2018 10:15:35 AM UTC
 
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open
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Wed 23 May 2018 10:15:35 AM UTC, original submission:  

Example:

#define PASTE_X(X) X

PASTE_X(
BEFORE:
#if HAS_X   same for e.g.: 1*HAS_X+0+2
int x; this gets replaced by the value of HAS_X
#endif
AFTER:
)

(Compile with e.g., tcc -DHAS_X=42 c.c. The output is then 42 instead of int x; )

This bug only affects expanded #if-blocks -- if the block isn't passed to a macro (variadic or not)
it expands OK.

If the macro inside the argument to the #if is preceded by `defined` or enclosed in `defined()`,
the expansion works OK again.

Anonymous

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

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