Re^2: Name conflict between MinGW C++ standard library header and Perl development header

The issue is located to perl.h, not XSUB.h:

#include "perl.h"
#include <iostream>

int main()
{
    std::cout << "foo" << std::endl;
}
[download]

and compile with:

D:\mydoc\projects\GenoEye-0.4.5-build\perl>g++ -ID:/gtk+-2.24.10/inclu
+de/cairo -ID:/gtk+-2.24.10/include/glib-2.0 -ID:/gtk+-2.24.10/
lib/glib-2.0/include -ID:/gtk+-2.24.10/include -ID:/gtk+-2.24.10/inclu
+de/freetype2 -ID:/gtk+-2.24.10/include/libpng14 -ID:/mydoc/pro
jects/GenoEye-0.4.5-Source/src -ID:/mydoc/projects/GenoEye-0.4.5-build
+/src -ID:/mydoc/projects/GenoEye-0.4.5-Source -ID:/Strawberry-
5.20.1.1-ia32/perl/lib/CORE -ID:/mydoc/projects/GenoEye-0.4.5-Source/p
+erl -g -o test.exe test.cpp
[download]

it will reproduce this issue. Also, add #undef write before #include <iostream> won't help.

However, this conflict do not reproduce if I use Inline::CPP. The code below works well:

use strict;
use Inline 'CPP' => config =>
     BUILD_NOISY => 1,
     INC => '-ID:/mydoc/projects/GenoEye-0.4.5-Source/src -ID:/mydoc/p
+rojects/GenoEye-0.4.5-Source/perl -ID:/gtk+-2.24.10/include/cairo';
     
foobar();

use Inline 'CPP' => <<'CODE';

#include <perl.h>
#include <iostream>

void foobar() {
    std::cout << "foobar" << std::endl;
}
CODE
[download]

Why there's such big difference? I cannot understand it...

Comment on Re^2: Name conflict between MinGW C++ standard library header and Perl development header Select or Download Code

Replies are listed 'Best First'.
Re^3: Name conflict between MinGW C++ standard library header and Perl development header by syphilis (Archbishop) on Nov 12, 2014 at 09:34 UTC
Why there's such big difference? I cannot understand it... (Yeah ... sorry, not much point running Inline::C scripts when we're dealing with something that's specific to Inline::CPP ;-) I don't grok C++, and I can only assume that in your simplified Inline::CPP script, the write() call in ostream has not been made visible. It's definite that 'write' has been defined to 'PerlLIO_write' - just try to use write() in your Inline::CPP script and you'll be able to verify: `use strict; use Inline 'CPP' => config => BUILD_NOISY => 1; foobar(); use Inline 'CPP' => <<'CODE'; #include <perl.h> // not needed - gets included automatically #include <iostream> void foobar() { std::cout << "foobar" << std::endl; } void break_me(SV * a, SV * b) { write(a, b); } CODE` [download] That generates the error: `try_pl_dec5.xs:28:14: error: macro "PerlLIO_write" requires 3 argument +s, but only 2 given write(a, b);` [download] In ostream, the `write()` declaration is preceded (next line up) by `__ostream_type&`. I don't know whether that puts aome sort of condition upon whether the function is visible or not. Maybe if you include the same headers in the compilation of your Inline::CPP script as were used for the C++ script then things might start to add up correctly. I know it's messy ... XS is like that, but you just have to work through it. Cheers, Rob	[reply] [d/l] [select]
Re^4: Name conflict between MinGW C++ standard library header and Perl development header by llancet (Friar) on Nov 13, 2014 at 09:48 UTC
`__ostream_type&` is the return type of `write()` function. Nothing important. In C++, "&" is reference. You can just treat it as a sugar for pointers.	[reply] [d/l] [select]
Re^3: Name conflict between MinGW C++ standard library header and Perl development header by Anonymous Monk on Nov 12, 2014 at 08:50 UTC
Why there's such big difference? I cannot understand it... Um, Inline generates XS, look at it and note the differences, right?	[reply]