This is the mail archive of the cygwin mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: sys/cdefs.h or maybe gcc build issue


On 10/30/2016 2:23 PM, cyg Simple wrote:
The below sample code will give a warning that visibility isn't
supported in this configuration.  Either the GCC build is incorrect or
the sys/cdefs.h needs to be modified to define __hidden to empty.

/********************************************/
#include <sys/cdefs.h>
#include <stdio.h>

__hidden void hello (char * str) {
	printf("%s %s\n", "Hello", str);
}

int main (int argc, char ** argv) {
	hello("cruel world!");
}
/********************************************/

If you're trying to write portable code, why would you assume that __hidden is defined? It's not defined in glibc, for example, and your sample program doesn't compile on Linux:

$ gcc test.c
test.c:4: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’

Do you have a real use case where this issue came up? The sample isn't very convincing as it stands.

Ken

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]