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Why configure failed to search libws2_32.a in MinGW+MSYS ?

From: Guo Leaveye
Subject: Why configure failed to search libws2_32.a in MinGW+MSYS ?
Date: Fri, 27 Dec 2013 16:58:27 +0800

I am porting a library and some utils from linux to windows.

My build PC is a Windows 7, with MSYS+MinGW installed in both D:\MinGW (first 
choice) and C:\MinGW (installer default).

Given a short WinSock program source _testlib.c_ here:

    /* testlib.c */
    #include <stdio.h>
    #include <windows.h>
    #include <winsock2.h>
    int main( void ) {
        printf( "%d\n", WSAGetLastError() );
        return 0;

Directly compile of the testlib.c goes just fine. So I think the MSYS+MinGW 
works well. To simulate the autotools' progress, I tried that compile to 
testlib.o and then link the execution. It works too.

    $ gcc -c -o testlib.o testlib.c && gcc -o out testlib.o -lws2_32 && ls -l 
    -rwxr-xr-x 1 Administrator Administrators 48899 Dec 27 16:27 out.exe

After that, I turn it into autotools:

    AC_INIT([testlib], [0.0.0], [<address@hidden>])
    AM_INIT_AUTOMAKE([-Wall foreign])
    AC_CHECK_LIB([ws2_32], [WSAGetLastError])
    AC_CHECK_LIB([libws2_32], [WSAGetLastError])

    noinst_PROGRAMS = out
    out_SOURCES = testlib.c

Note that, in the file, I check both ws2_32 and libws2_32 to 
confirm the library file name rules.
After first `autoconf' failure, my `autoreconf -i' succeed, and the 
`./configure' reports:

> checking for a BSD-compatible install... /bin/install -c
> checking whether build environment is sane... yes
> checking for a thread-safe mkdir -p... /bin/mkdir -p
> checking for gawk... gawk
> checking whether make sets $(MAKE)... yes
> checking for gcc... gcc
> checking whether the C compiler works... yes
> checking for C compiler default output file name... a.exe
> checking for suffix of executables... .exe
> checking whether we are cross compiling... no
> checking for suffix of object files... o
> checking whether we are using the GNU C compiler... yes
> checking whether gcc accepts -g... yes
> checking for gcc option to accept ISO C89... none needed
> checking for style of include used by make... GNU
> checking dependency style of gcc... gcc3
> checking for WSAGetLastError in -lws2_32... no
> checking for WSAGetLastError in -llibws2_32... no
> configure: creating ./config.status
> config.status: creating Makefile
> config.status: executing depfiles commands

Note that, (1) both library libws2_32.a check report `no', and (2) the compiler 
is exactly my simulation target `gcc'.

I know that I can add a check into to examine whether building in 
mingw or cygwin, but is this checking supposed to be fully examination for the 
real build environment ? If it works fine, LIB variable should be full filled 
with all required library link options. If there a simple way by adjust my 
MSYS+MinGW environment to make autoconf works, please tell me.


Levi G.
Haskell is a beautiful language.

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