Hi

You need to use
Extern "C" {.....}

Around all header includes that reference any library that was written in c to properly link against a c++ program

Best wishes
Ian Sharp PhD

On Sep 7, 2012, at 7:33 AM, "crillion_at_tiscali.it" <crillion_at_tiscali.it> wrote:

> Hi,
>
> I'm trying to use libcurl on windows vista (32) with mingw,
> linking it statically to C++ programs. The problem I get is that I
> cannot link my client program, or when I'm able to link it, it doesn't
> work anyway(it requires the dll). I've already read many similar
> requests for static linkage problems with curl, and I think have
> applied the related suggestions, but the problem persists.
>
> I have
> synthesized my problem in 2 cases, one with curl-7.27.0 compiled in the
> default way, and the other with curl-7.27.0 compiled with static
> options. In each of the cases I have a .bat script compiling the
> program and a simple C++ program using curl.
>
> What I really need is to
> be able to link curl statically, so I ask if you can explain me where
> I'm doing wrong and how can actually get my program compiling.
>
> Here
> are my 2 cases:
>
> ========================================
>
> ------------------------------
> case 1: default curl compile
>
> ------------------------------
>
> - get curl-7.27.0.
> - extract it into a
> folder, such as
> (...)\data\projects\external\libcurl\curl-7.27.0-
> default
> - open mingw shell
> - go the folder
> (...)
> \data\projects\external\libcurl\curl-7.27.0-default
> - give the command
> .
> /configure
> (wait till the command ends)
> - give the command
> make
> (wait
> till the command ends)
> - create then a c++ program, such this file:
>
> (...)
> \data\projects\repository1\tests\libcurl\test_libcurl_client_default\test_libcurl_client_default.
> cpp
>
> here's the c++ program source code:
>
> #include <curl/curl.h>
>
> #include <curl/easy.h>
>
> int main(int argc, char* argv[])
> {
>
> curl_global_init(CURL_GLOBAL_ALL);
> }
>
> - create the .bat file to compile
> the program:
> (...)
> \data\projects\repository1\tests\libcurl\test_libcurl_client_default\compile_test_libcurl_client_default_gpp.
> bat
>
> here's the .bat source code:
>
> g++ test_libcurl_client_default.cpp -
> o test_libcurl_client_default_gpp.exe -I../../../..
> /external/libcurl/curl-7.27.0-default/include -L../../../..
> /external/libcurl/curl-7.27.0-default/lib/.libs -lcurl -L../../../..
> /external/libcurl/curl-7.27.0-default/lib/.deps -lwsock32
>
>
> - now
> close mingw shell and start using normal windows command prompt
> - from
> the windows command prompt, run the .bat to build the program. the
> build process works and I get the output:
>
> Z:
> \data\users\marco_pappalepore\data\projects\repository1\tests\libcurl\test_libcurl_client_default>g++
> test_libcurl_client_default.cpp
> -o test_libcurl_client_default_gpp.exe
> -I../../../../external/libcurl/curl-7.27.0-default/include -L../../../..
> /external/libcurl/curl-
> 7.27.0-default/lib/.libs -lcurl -L../../../..
> /external/libcurl/curl-7.27.0-default/lib/.deps -lwsock32
>
> - now the
> generated program, test_libcurl_client_default_gpp.exe exists and can
> be launched via the command
> test_libcurl_client_default_gpp
>
> - this
> gives the error:
>
> "test_libcurl_client_default_gpp.exe - unable to
> locate component"
> "This application has failed to start because libcurl-
> 4.dll was not found. Re-installing the application may fix this
> problem."
>
> - I don't want to use dlls, I need to produce a single file
> executable, so anyway this option cannot be done.
>
>
> ========================================
> ------------------------------
>
> case 2: static curl compile
> ------------------------------
>
> - get curl-
> 7.27.0.
> - extract it into a folder, such as
> (...)
> \data\projects\external\libcurl\curl-7.27.0-static
> - open mingw shell
> -
> go the folder
> (...)\data\projects\external\libcurl\curl-7.27.0-static
> -
> give the command
> ./configure --enable-static --disable-shared --with-
> ssl
> (wait till the command ends)
> - give the command
> make LDFLAGS=-all-
> static
> (wait till the command ends)
> - create then a c++ program, such
> this file:
> (...)
> \data\projects\repository1\tests\libcurl\test_libcurl_client_static\test_libcurl_client_static.
> cpp
>
> here's the c++ program source code:
>
> #include <curl/curl.h>
>
> #include <curl/easy.h>
>
> int main(int argc, char* argv[])
> {
>
> curl_global_init(CURL_GLOBAL_ALL);
> }
>
> - create the .bat file to compile
> the program:
> (...)
> \data\projects\repository1\tests\libcurl\test_libcurl_client_static\compile_test_libcurl_client_static_gpp.
> bat
>
> here's the .bat source code:
>
> g++ test_libcurl_client_static.cpp -
> DCURL_STATICLIB -o test_libcurl_client_static_gpp.exe -I../../../..
> /external/libcurl/curl-7.27.0-static/include -L../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs -lcurl -L../../../..
> /external/libcurl/curl-7.27.0-static/lib/.deps -lwsock32
>
> - now close
> mingw shell and start using normal windows command prompt
> - from the
> windows command prompt, run the .bat to build the program. Now I get
> the following output with error messages:
>
>
>
> g++
> test_libcurl_client_static.cpp -DCURL_STATICLIB -o
> test_libcurl_client_static_gpp.exe -I../../../../external/libcurl/curl-
> 7.27.0-static/include -L../../../../external/libcurl/curl-7.27.0-
> static/lib/.libs -lcurl -L../../../../external/libcurl/curl-7.27.0-
> static/lib/.deps -lwsock32
>
> ../../../../external/libcurl/curl-7.27.0-
> static/lib/.libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0x221):
> undefined reference to `_i
> mp__ldap_err2stringA'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0x262): undefined reference to `_i
>
> mp__ldap_msgfree'
> ../../../../external/libcurl/curl-7.27.0-static/lib/.
> libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0x28e): undefined
> reference to `_i
> mp__ldap_unbind_s'
> ../../../../external/libcurl/curl-
> 7.27.0-static/lib/.libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.
> text+0x636): undefined reference to `_i
> mp__ldap_set_optionA'
> ../../..
> /../external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0x659): undefined reference to `_i
>
> mp__ldap_sslinitA'
> ../../../../external/libcurl/curl-7.27.0-static/lib/.
> libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0x6b9): undefined
> reference to `_i
> mp__ldap_simple_bind_sA'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0x70a): undefined reference to `_i
>
> mp__ldap_search_sA'
> ../../../../external/libcurl/curl-7.27.0-
> static/lib/.libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0x727):
> undefined reference to `_i
> mp__ldap_err2stringA'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0x7ae): undefined reference to `_i
>
> mp__ldap_err2stringA'
> ../../../../external/libcurl/curl-7.27.0-
> static/lib/.libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0x80d):
> undefined reference to `_i
> mp__ldap_set_optionA'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0x828): undefined reference to `_i
>
> mp__ldap_initA'
> ../../../../external/libcurl/curl-7.27.0-static/lib/.
> libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0x85c): undefined
> reference to `_i
> mp__ldap_first_entry'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0x896): undefined reference to `_i
>
> mp__ldap_get_dnA'
> ../../../../external/libcurl/curl-7.27.0-static/lib/.
> libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0x92b): undefined
> reference to `_i
> mp__ldap_first_attributeA'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0x952): undefined reference to `_i
>
> mp__ldap_get_values_lenA'
> ../../../../external/libcurl/curl-7.27.0-
> static/lib/.libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0xb20):
> undefined reference to `_i
> mp__ldap_value_free_len'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0xb6d): undefined reference to `_i
>
> mp__ldap_memfreeA'
> ../../../../external/libcurl/curl-7.27.0-static/lib/.
> libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0xb87): undefined
> reference to `_i
> mp__ldap_next_attributeA'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0xb9e): undefined reference to `_i
>
> mp__ldap_memfreeA'
> ../../../../external/libcurl/curl-7.27.0-static/lib/.
> libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0xbb6): undefined
> reference to `_i
> mp__ber_free'
> ../../../../external/libcurl/curl-7.27.0-
> static/lib/.libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0xbc9):
> undefined reference to `_i
> mp__ldap_next_entry'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0xbee): undefined reference to `_i
>
> mp__ldap_value_free_len'
> ../../../../external/libcurl/curl-7.27.0-
> static/lib/.libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0xbfa):
> undefined reference to `_i
> mp__ldap_memfreeA'
> ../../../..
> /external/libcurl/curl-7.27.0-static/lib/.libs/libcurl.a(libcurl_la-
> ldap.o):ldap.c:(.text+0xc06): undefined reference to `_i
>
> mp__ldap_memfreeA'
> ../../../../external/libcurl/curl-7.27.0-static/lib/.
> libs/libcurl.a(libcurl_la-ldap.o):ldap.c:(.text+0xc22): undefined
> reference to `_i
> mp__ber_free'
> collect2: ld returned 1 exit status
>
>
> -
> It seems that the compiler is searching some "ldap" library that I
> don't think I have on windows vista/mingw. I had already been able to
> reduce some of these errors by linking also wsock32 with the option -
> lwsock32;
> anyway it seems that this ldap library is not present on my
> system.
>
> So:
>
> what other steps am I supposed to do in order to make
> the build process work, and the program run without the need of any dll
> ?
>
> Many thanks,
>
> Marco
>
>
>
>
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>
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Received on 2012-09-08