Why Cygwin tries to pull in winsock2.h when compiling a Linux application?

Why Cygwin tries to pull in winsock2.h when compiling a Linux application?

[Patrick L]

Hi, I am using Cygwin 1.7.11 i686 on Windows 7 PC. I am trying to compile a Linux C++ application on Cygwin.

When I use the ./configure command, Cygwin shows the following error messages:

checking winsock2.h usability... no
checking winsock2.h presence... yes
configure: WARNING: winsock2.h: present but cannot be compiled
configure: WARNING: winsock2.h:     check for missing prerequisite headers?
configure: WARNING: winsock2.h: see the Autoconf documentation
configure: WARNING: winsock2.h:     section "Present But Cannot Be Compiled"
configure: WARNING: winsock2.h: proceeding with the preprocessor's result
configure: WARNING: winsock2.h: in the future, the compiler will take precedence
configure: WARNING:     ## ------------------------------------------ ##
configure: WARNING:     ## Report this to xxx@xxx.xxx ##
configure: WARNING:     ## ------------------------------------------ ##
checking for winsock2.h... yes
checking ws2tcpip.h usability... no
checking ws2tcpip.h presence... yes
configure: WARNING: ws2tcpip.h: present but cannot be compiled
configure: WARNING: ws2tcpip.h:     check for missing prerequisite headers?
configure: WARNING: ws2tcpip.h: see the Autoconf documentation
configure: WARNING: ws2tcpip.h:     section "Present But Cannot Be Compiled"
configure: WARNING: ws2tcpip.h: proceeding with the preprocessor's result
configure: WARNING: ws2tcpip.h: in the future, the compiler will take precedence
configure: WARNING:     ## ------------------------------------------ ##
configure: WARNING:     ## Report this to xxx@xxx.xxx ##
configure: WARNING:     ## ------------------------------------------ ##
checking for ws2tcpip.h... yes

winsock2.h and ws2tcpip.h are Windows header files for Windows network/socket programming. Why Cygwin tries to pull in Windows header files when I am compiling a Linux C++ application? How can I fix this issue?

Thanks.


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Re: Why Cygwin tries to pull in winsock2.h when compiling a Linux application?

[marco atzeri]

On 6/30/2012 9:41 AM, Patrick L wrote:
> Hi, I am using Cygwin 1.7.11 i686 on Windows 7 PC. I am trying to compile a Linux C++ application on Cygwin.
>
> When I use the ./configure command, Cygwin shows the following error messages:
>
> checking winsock2.h usability... no
> checking winsock2.h presence... yes

If this program is looking for winsock2.h than it allows to be
compiled on windows.
It is not cygwin requesting it, it is the configure itself

> configure: WARNING: winsock2.h: present but cannot be compiled
> configure: WARNING: winsock2.h:     check for missing prerequisite headers?
> configure: WARNING: winsock2.h: see the Autoconf documentation
> configure: WARNING: winsock2.h:     section "Present But Cannot Be Compiled"
> configure: WARNING: winsock2.h: proceeding with the preprocessor's result
> configure: WARNING: winsock2.h: in the future, the compiler will take precedence
> configure: WARNING:     ## ------------------------------------------ ##
> configure: WARNING:     ## Report this to xxx@xxx.xxx ##
> configure: WARNING:     ## ------------------------------------------ ##
> checking for winsock2.h... yes
> checking ws2tcpip.h usability... no
> checking ws2tcpip.h presence... yes
> configure: WARNING: ws2tcpip.h: present but cannot be compiled
> configure: WARNING: ws2tcpip.h:     check for missing prerequisite headers?
> configure: WARNING: ws2tcpip.h: see the Autoconf documentation
> configure: WARNING: ws2tcpip.h:     section "Present But Cannot Be Compiled"
> configure: WARNING: ws2tcpip.h: proceeding with the preprocessor's result
> configure: WARNING: ws2tcpip.h: in the future, the compiler will take precedence
> configure: WARNING:     ## ------------------------------------------ ##
> configure: WARNING:     ## Report this to xxx@xxx.xxx ##
> configure: WARNING:     ## ------------------------------------------ ##
> checking for ws2tcpip.h... yes
>
> winsock2.h and ws2tcpip.h are Windows header files for Windows network/socket programming. Why Cygwin tries to pull in Windows header files when I am compiling a Linux C++ application? How can I fix this issue?
>
> Thanks.

Which program ?






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Re: Why Cygwin tries to pull in winsock2.h when compiling a Linux application?

[Csaba Raduly]

Hi Patrick

On Sat, Jun 30, 2012 at 9:41 AM, Patrick L  wrote:
> Hi, I am using Cygwin 1.7.11 i686 on Windows 7 PC. I am trying to compile a Linux C++ application on Cygwin.
>
> When I use the ./configure command, Cygwin shows the following error messages:
>
> checking winsock2.h usability... no
> checking winsock2.h presence... yes
> configure: WARNING: winsock2.h: present but cannot be compiled
(snip)
> winsock2.h and ws2tcpip.h are Windows header files for Windows network/socket programming. Why Cygwin tries to pull in Windows header files when I am compiling a Linux C++ application?

Because the configure script is trying to find them.
I suspect this is a program (or its configure script) which "thinks"
that Cygwin is Windows. (It appears to be testing explicitly for
winsock2.h; it shouldn't)

> How can I fix this issue?

Tell the authors of the program that Cygwin is not Windows.

Take a look at config.log; it should contain the error message from
the compiler when it tried to use winsock2.h
Search for         checking winsock2.h usability            in
config.log; there should be a short C source, a gcc invocation and an
error message.

Csaba
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