Re: [lwip-devel] Building using MinGW

[Giuseppe Modugno]

Il 18/12/2019 11:42, Gisle Vanem ha scritto:
> Trying to build lwIP using TDM-gcc 5.1.0 (MinGW), now produces
> this error:
>   In file included from f:/MingW32/src/inet/libpcap/pcap/pcap.h:74:0,
>                    from f:/MingW32/src/inet/libpcap/pcap.h:43,
>                    from contrib/ports/win32/pcapif.c:50:
>   f:/MingW32/src/inet/libpcap/pcap/pcap-inttypes.h:48:6: error: #error 
> "Building libpcap
> requires VS 2015 or   later"
>        #error "Building libpcap requires VS 2015 or later"
>         ^
>
>
> The cause of this is the "define _MSC_VER 1500" in pcapif.c:
>   /* e.g. mingw */
>   #define _MSC_VER 1500
>   #include "pcap.h"
>   #undef _MSC_VER
>
> Bumping '_MSC_VER' to 1900 fixes this. But why are these lines needed?
I have a project with lwip that compiles with mingw. I think you are 
using a different version of pcap libraries. I vaguely remember I 
couldn't be able to compile with an updated pcap library.

Indeed I don't have pcap-inttypes.h at all and pcap/pcap.h doesn't have 
any reference to that file. I'm not using a globally installed pcap 
libraries, pcap includes and libraries are "installed" in the project 
folder. It seems I'm using Winpcap 4.1.2 (most probably this[*]).

[*] https://www.winpcap.org/install/bin/WpdPack_4_1_2.zip