Re: [Mingw-users] How do I write native windows code with MinGW? POSIX calls are compiling?.
- Date: Sat, 18 Mar 2017 09:38:11 -0400
- From: Earnie <earnie@xxxxxxxxxxxxxxxxxxxxx>
- Subject: Re: [Mingw-users] How do I write native windows code with MinGW? POSIX calls are compiling?.
On 3/17/2017 4:25 AM, Eli Zaretskii wrote:
>> Date: Thu, 16 Mar 2017 19:33:05 -0400
>> From: kk.mingw@xxxxxxxxxxxxxxx
>> How do I write native windows code with MinGW? Getting POSIX calls to
> There's no single answer to that, it depends on the APIs you need.
> But as a rule of thumb, mots Posix APIs are absent.
>> Exactly what I want – Let me explain. I followed the directions for a
>> new instillation. I have a Linux program that works in Linux. It will
>> also work in Cygwin. The program has several POSIX calls that I know
>> windows does NOT support (getopt(), glob(), ...). I tried compiling this
>> program with MinGW expecting errors --- but to my surprise it compiles,
>> links, and runs. Clearly, it has linked with some libs that provide
>> POSIX – how do I get Windows and nothing but windows?
> MinGW adds a small set of popular Posix functions in the libmingwex
> library that is scanned by default by the linker when linking
> programs. If you want to know which additional functions are
> available, use something like 'nm -A libmingwex.a | grep " T "', and
> you will see them. Most of them are math functions, but some, like
> getopt and glob, are not.
Don't forget though that all of those symbols may not be declared due to
defined constants which get defined by various methods. If you want to
eliminate the POSIX emulations use -std=c## where ## is replaced by your
favorite standard version moniker e.g. -std=c99. I also suggest using
-Wall -Werror if you want to ensure that there are no hidden issues.
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