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I am having some big headaches linking statically libcurl in MSYS2 mingw. I installed libcurl and all the listed dependencies from here

https://packages.msys2.org/package/mingw-w64-x86_64-curl

Since I am using CodeBlocks as IDE I need to supply a whole list of libs in form of lib#?.a, please keep in mind that I know nothing of Linux world and gcc tools and command line, otherwise I wouldn't be using an IDE!

Also I am not skilled enough to compile lib packages. I just need to write some portable code to do a https post request in cpp, so I need libcurl.

Can you tell me a complete list of all the needed libs to link against ? I tried all my best but I keep getting an infinity of unresolved symbols

UPDATE

After having checked what the package config for libcurl says, I have installed all the missing libs and used the following command line:

g++.exe -o MyProg.exe obj\Release\main.o -static-libstdc++ -static-libgcc -static -m64 -lcurl -lnghttp2 -lidn2 -lssh2 -lpsl -ladvapi32 -lcrypt32 -lssl -lcrypto -lssl -lcrypto -lgdi32 -lwldap32 -lzstd -lbrotlidec -lz -lws2_32 -s

Despite that I am still getting tons of undefined references:

d:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: d:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/lib/../lib\libcurl.a(gsasl.o):(.text+0x14): undefined reference to `gsasl_init'

[plus many other 'gsasl...' referrences]

d:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: d:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../lib\libbrotlidec.a(decode.c.o):(.text+0x2d28): undefined reference to `BrotliTransformDictionaryWord'

[plus many other 'brotli...' references]

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  • I suggest you use cpp-httplib. It's portable and header only library, no custom linker steps are required. Unless you want to enable https support.
    – 3CxEZiVlQ
    Commented May 19, 2022 at 0:28
  • @273K sadly I am forced to have HTTPS support :(
    – elena
    Commented May 19, 2022 at 19:19
  • If you focused on HTTPS, then you will apply the same options after libcurl.
    – 3CxEZiVlQ
    Commented May 19, 2022 at 20:34

1 Answer 1

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pkg-config will tell you the necessary flags. Install it from the package mingw-w64-x86_64-pkg-config.

Run it as pkg-config --libs --static libcurl.

Copy the output into "linker flags -> other". For me the output is -L/mingw64/lib -lcurl -lnghttp2 -lidn2 -lssh2 -lpsl -ladvapi32 -lcrypt32 -lssl -lcrypto -lssl -lcrypto -lgdi32 -lwldap32 -lzstd -lbrotlidec -lz -lws2_32. Don't forget to add the --static flag, if you're not already doing so.

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10
  • Thanks HolyBlackCat... that was actually what I already did by looking at what the package config says. Unfortunately it does not work, I keep getting undefined references. I really don't know what I am still doing wrong. This is my command line: g++.exe -o Workbench.exe obj\Release\main.o -static-libstdc++ -static-libgcc -static -m64 -lcurl -lnghttp2 -lidn2 -lssh2 -lpsl -ladvapi32 -lcrypt32 -lssl -lcrypto -lssl -lcrypto -lgdi32 -lwldap32 -lzstd -lbrotlidec -lz -lws2_32 -s. I am not allowed to post the full output because it is too long sadly
    – elena
    Commented May 19, 2022 at 19:09
  • @elena The output you posted hints that you have some other MinGW version installed, which somehow interferes. Remove it. Also, I believe -m64 is unnecessary (MINGW64 compiler defaults to 64 bits), and so are -static-libstdc++ -static-libgcc (they're implied by -static).
    – HolyBlackCat
    Commented May 19, 2022 at 19:20
  • #HolyBlackCat thanks for your patience. Those flags are set by Code::Blocks, however I removed them and I just left -static, no hope. Re: some other MinGW version, that is unlike since I am using a freshly installed MSYS2 and my IDE points to its mingw64 dir only and nothing else...
    – elena
    Commented May 19, 2022 at 19:25
  • @elena Then what's in d:/mingw64_prev?
    – HolyBlackCat
    Commented May 19, 2022 at 20:01
  • 1
    @elena I could swear it worked for me yesterday, but apparently I tested it incorrectly; I do reproduce the problem. Apparently it's already been reported. Though I would remove d:/mingw64_prev, since it shouldn't appear in the output at all. At least remove it from the PATH.
    – HolyBlackCat
    Commented May 20, 2022 at 4:52

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