[Tinycc-devel] Report a Bug about Parsing #ifdef, #ifndef and #else Line

[837806295]

Hello!

Report a Bug about Parsing #ifdef, #ifndef and #else Line.

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Bug info:

File: tccpp.c

Function: preprocess, preprocess_skip

Line: 1813, 1816, 1842

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Test code:

#include <stdio.h>

#define Test

int main(int argc, const char **argv)

{

#ifndef Test #else

printf("Hello, Test\n");

#endif

printf("Hello, World\n");

return 0;

}

Hello, Test Hello, World

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Problem:

In the preprocess function, when analyzing lines containing preprocessor 

directives such as #ifndef, #ifdef, and #else, the entire line is not 

being fully read. When the conditions for a branch are not met and the 

preprocess_skip function is invoked to skip over subsequent code, 

issues arise because preprocess_skip assumes it is starting at the 

beginning of a new line. 

As in the code above, it is possible to insert a large amount of whitespace 

before an #else directive on a single line. If the #else is not properly 

detected due to this issue, it can cause confusion and make it difficult 

for someone to identify the root cause.

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Fix:

According to your decision.

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