The C++ preprocessor of Oracle Solaris Studio 12.3 removes whitespace completely when expanding __VA_ARGS__
.
Can anybody confirm this behaviour on their system? Is it a known compiler bug? Are there any workarounds for this problem?
To illustrate, here is a simple test program, vaargs.c
:
#include <stdio.h>
#define PRINT(...) printf("%s\n", #__VA_ARGS__)
int main()
{
PRINT(hello world);
return 0;
}
The C preprocessor works as expected:
$ cc vaargs.c -o vaargs && ./vaargs
hello world
$ cc -V
cc: Sun C 5.12 SunOS_i386 2011/11/16
But the C++ preprocessor removes the space between "hello" and "world":
$ CC vaargs.c -o vaargs && ./vaargs
helloworld
$ CC -V
CC: Sun C++ 5.12 SunOS_i386 2011/11/16
This is a compiler bug, as per N3337 16.3.2 (cpp.stringize) p2 (the rest of the quote is snipped):
A character string literal is a string-literal with no prefix. If, in the replacement list, a parameter is immediately preceded by a
#
preprocessing token, both are replaced by a single character string literal preprocessing token that contains the spelling of the preprocessing token sequence for the corresponding argument. Each occurrence of white space between the argument’s preprocessing tokens becomes a single space character in the character string literal.
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