Need help compiling use of std::vector

[Matthias Andree]

Am 24.09.2014 um 17:04 schrieb Shane Ambler:
> I am trying to compile the new version of a port I maintain and have
> trouble related to std::vector. The code producing the error can be
> boiled down to the following test case, which compiles as 64bit but
> fails as 32bit.
> 
> #include <stdlib.h>
> #include <vector>
> 
> int main(int argc, char *argv[])
> {
>     int num_layers = 3;
>     std::vector<const char *> layers (num_layers, NULL);
> 
>     exit(0);
> }
> 
> So that should create a vector containing 3 items initially set to NULL.
> 
> 10.0 compiles ok - both 32 and 64 bit. (libc++)
> 8.4, 9.2 and 9.3 compiles 64bit but fails on 32bit. (libstdc++)
> 
> Using the above code
> clang++ -m32 test.cpp
> fails with
> 
> /usr/include/c++/4.2/bits/stl_algobase.h:641:15: error: assigning to
> 'const char *' from incompatible type 'const int'

I don't think "-m32" compilation has ever worked properly for C++ on the
older FreeBSD releases, where older includes 9.3.

You're probably better off trying to build with 32-bit chroots or jails
on your 64-bit host, like poudriere or Tinderbox are doing (but I'm not
sure if they support setting up 32-bit jails on 64-bit computers).

See here
<https://lists.freebsd.org/pipermail/freebsd-stable/2009-September/051855.html>

so it's a long-standing thing, and for "recent" developments:

<https://lists.freebsd.org/pipermail/freebsd-current/2013-June/042378.html>
-so that would have been for 10-CURRENT at the time, and hints that the
headers weren't pure enough for -m32 and similar tricks.

I am not aware that this effort was ever MFH'd.

I am Cc'ing Konstantin Belousov in case he wants to shed more light on
this issue.

HTH