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__STDC__ always defined in CDT?? [message #735594]

Wed, 12 October 2011 06:11

Eclipse User

It seems the symbol __STDC__ is always defined while source parsing.
Compiling of the source does not define the symbol __STDC__.

How can I disable this feature?

reproduction (Eclipse Indigo):

1. create a new C or C++ project.
2. create a new file with following content

//#undef __STDC__

#if !__STDC__
#define TEST "TEST"
#endif

"#define TEST" is shown as unreachable. But if you uncomment "#undef __STDC__" the statement is getting reachable ?!

Regards,
Gert

Re: __STDC__ always defined in CDT?? [message #735639 is a reply to message #735594]

Wed, 12 October 2011 09:10

Eclipse User

AFAIK, CDT gets the symbol from the debugger (aka Scanner Discovery). Create an empty source file test.c and call on the command line

gcc -E -P -dD test.c

This will show you the default predefined symbols (for gcc!).

Re: __STDC__ always defined in CDT?? [message #735644 is a reply to message #735594]

Wed, 12 October 2011 09:10

Eclipse User

AFAIK, CDT gets the symbol from the debugger (aka Scanner Discovery). Create an empty source file test.c and call on the command line
gcc -E -P -dD test.c
This will show you the default predefined symbols (for gcc!).
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Re: __STDC__ always defined in CDT?? [message #735655 is a reply to message #735644]

Wed, 12 October 2011 09:41

Eclipse User

Sorry, I forgot to tell! I use the Microsoft Visual C++ tool chain with CDT Internal Builder. So gcc is no option for me.

Regards, Gert

Re: __STDC__ always defined in CDT?? [message #735927 is a reply to message #735655]

Thu, 13 October 2011 02:47

Eclipse User

Gert.Grossmann wrote on Wed, 12 October 2011 15:41

Sorry, I forgot to tell! I use the Microsoft Visual C++ tool chain with CDT Internal Builder. So gcc is no option for me.

Regards, Gert

Visual C++ defines __STDC__, too.
http://msdn.microsoft.com/en-us/library/b0084kay(v=vs.80).aspx

You can try to remove the symbol from Project Properties->C/C++ General->Paths and Symbols

Re: __STDC__ always defined in CDT?? [message #735937 is a reply to message #735927]

Thu, 13 October 2011 03:06

Eclipse User

But Visual C++ does this symbol only define if /Za is on and we're not compiling C++ code.
So this define should depend on compiler switch /Za (switchable via Visual C++ Tool Chain)

Regards, Gert

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