Cannot compile curl and libgcc as a static library in MinGW/CLion (c++)

Question

I am trying to compile curl and libgcc as a static library so I would not have to include dll files with my program. I am having problems with libcurl.dll not found when I run the executable through command prompt. Also, there is another error libgcc_s_dw2-1.dll not found.

It works when I put the dll files in the same folder as executable but that is not what I am really fond of. I have put -DCURL_STATICLIB in CMAKE_CXX_FLAGS as suggested here:

https://curl.haxx.se/docs/install.html

Here is my CMakeLists.txt

project(ham)

set(CMAKE_CXX_STANDARD 14)

set(CMAKE_C_FLAGS -m32 -DCURL_STATICLIB)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32 -std=c++14 -LC:/curlx86 -lcurl")

set(CMAKE_CXX_STANDARD_LIBRARIES "${CMAKE_CXX_STANDARD_LIBRARIES} -static-libgcc -static-libstdc++ -lwsock32 -lws2_32 -lwinmm")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-Bstatic,--whole-archive -Wl,--no-whole-archive")


project(untitled3)
add_executable(ham Ham/ham.cpp)

target_link_libraries(ham "C:/curlx86/libcurl.dll.a")

I want my program to run without including any extra dll files. What should I do ?

Edit When I use target_link_libraries(ham "C:/curlx86/libcurl.dll.a")

I get these errors.

c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(easy.o):(.text+0x8f): undefined reference to libssh2_init' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(easy.o):(.text+0x16b): undefined reference tolibssh2_exit' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0xcd): undefined reference to nghttp2_version' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x2ca): undefined reference tonghttp2_submit_rst_stream' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x2dc): undefined reference to nghttp2_session_send' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x31d): undefined reference tonghttp2_session_set_stream_user_data' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x3c0): undefined reference to nghttp2_pack_settings_payload' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x4bd): undefined reference tonghttp2_session_resume_data' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x4fe): undefined reference to nghttp2_session_mem_recv' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x51c): undefined reference tonghttp2_strerror' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x5c3): undefined reference to nghttp2_priority_spec_init' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x614): undefined reference tonghttp2_submit_priority' c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:/curlx86/libcurl.a(http2.o):(.text+0x621): undefined reference to `nghttp2_session_send'

File .dll.a is an import file for a dynamic library, this is not a static library. You need to link with libcurl.a or so, without .dll part. — Tsyvarev
– Tsyvarev, Commented May 27, 2019 at 11:41
Hi I tried it and I have edited my results above. I get alot of errors when I use libcurl.a. I had to delete most of the errors from text above because there were ton of them. I am guessing I am missing ssl and other libraries alike. — John Byron
– John Byron, Commented May 27, 2019 at 12:13
Yes, when link with the static library you need manually to link with all libraries from which given library depends. Unlike to dynamic libraries, static ones don't store list of required libraries. — Tsyvarev
– Tsyvarev, Commented May 27, 2019 at 12:54

Cristian Ciupitu · Accepted Answer · 2021-04-05 18:39:21Z

Part 1. Setting up openssl v1.1.1b

Download the openssl v1.1.1b package (not the installer)
Download and install MSYS2
Open msys.exe (not mingw32.exe or mingw.exe)

Run this command to install perl and other packages:

pacman -S make perl msys2-devel libcrypt-devel perl-CPAN mingw-w64-i686-toolchain

Now close msys.exe and open mingw32.exe
Change directory to wherever you extracted the openssl package, in my case it's this:
```
cd "C:\Users\John\Downloads\openssl-1.1.1b\openssl-1.1.1b"
```
Before continuing any further you have to add #include <windows.h> to these files underneath the directory:
- crypto\dso\dso_win32.c
- crypto\init.c

Run (this compiles openssl as a static library):

./configure --prefix=c:/OpenSSLx86 --openssldir=c:/OpenSSLx86 no-threads no-idea no-shared mingw

Run make clean
Run make depend
Run make
Run make install

Part 2. Building curl with openssl v1.1.1b

Download and extract the curl package

Change directory:

cd "C:\Users\John\Downloads\curl\curl-7.65.0"

Edit lib\curl_setup.h and add the following lines to reduce the size of the compiled library by choosing only the options you will use. I will be using only the SMTP protocol, so I am disabling the others.

#define CURL_DISABLE_TFTP
#define CURL_DISABLE_FTP
#define CURL_DISABLE_LDAP
#define CURL_DISABLE_TELNET
#define CURL_DISABLE_DICT
#define CURL_DISABLE_FILE
#define CURL_DISABLE_RTSP
#define CURL_DISABLE_POP3
#define CURL_DISABLE_IMAP
//#define CURL_DISABLE_SMTP
#define CURL_DISABLE_GOPHER
#define CURL_DISABLE_SMB

Set OPENSSL_PATH = C:\OpenSSLx86 in these files:

lib\Makefile.m32
src\Makefile.m32

Run make mingw32-ssl
Now copy libcurl.a from lib to C:\curlx86 and you are good to go.

Here is my final CMakeLists.txt:

cmake_minimum_required(VERSION 3.3)     #curl
project(ham)

set(CMAKE_CXX_STANDARD 14)

add_compile_definitions(
        CURL_STATICLIB
        WITH_SSL=STATIC
)
#CURL_DISABLE_SMTP

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32 -LC:/curlx86 -lcurl -LC:/OpenSSLx86/lib -lssl -LC:/OpenSSLx86/lib -lcrypto")

set(CMAKE_CXX_STANDARD_LIBRARIES "${CMAKE_CXX_STANDARD_LIBRARIES} -static-libgcc -static-libstdc++ -lwsock32 -lws2_32 -lwinmm -lcrypt32")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-Bstatic,--whole-archive -lwinpthread -Wl,--no-whole-archive") 


project(untitled3)
add_executable(ham Ham/ham.cpp)

target_link_libraries(ham "C:/curlx86/libcurl.a"  "C:/OpenSSLx86/lib/libssl.a" "C:/OpenSSLx86/lib/libcrypto.a")

Collectives™ on Stack Overflow

Cannot compile curl and libgcc as a static library in MinGW/CLion (c++)

1 Answer 1

Part 1. Setting up openssl v1.1.1b

Part 2. Building curl with openssl v1.1.1b

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Collectives™ on Stack Overflow

1 Answer 1

Part 1. Setting up openssl v1.1.1b

Part 2. Building curl with openssl v1.1.1b

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