Esp32-snippets: Compile error building curl - following esp32-snippets/curl/build_files/

[mgleason]

BTW, thanks for creating the curl build instructions. I followed the instructions at esp32-snippets/curl/build_files/. Unfortunately when I make the project, I get the following error:

CC lib/vauth/cleartext.o
/Users/mike/Dev/esp/i2s/components/curl/lib/vauth/cleartext.c:165:1: fatal error: opening dependency file lib/vauth/cleartext.d: No such file or directory
}
^
compilation terminated.
make[1]: * [lib/vauth/cleartext.o] Error 1
make: * [curl-build] Error 2

[nkolban]

Hi my friend ... looking at it now. If you can, ping me at #ESP32 on IRC channel that would be great and we can chat live. Failing that run "ls -l /Users/mike/Dev/esp/i2s/components" and attach the results in a ZIP to this issue.

[mgleason]

nkolban - Thanks for your help today!

Here's some notes captured for "Getting the ESP32 curl build working if you're developing on MacOS/OSX":

1. Follow the "Building curl" directions: https://github.com/nkolban/esp32-snippets/tree/master/curl/build_files.
2. Change back to project root (cd ../..).
3. Go ahead and "make" the project and let it fail. This creates the build/curl/lib/ directory among others.
4. Create two directories:
   > mkdir build/curl/lib/vauth
   > mkdir build/curl/lib/vtls
5. Modify the last line of component.mk so that it reads:
   > CFLAGS+=-DHAVE_CONFIG_H -DBUILDING_LIBCURL -DMBEDTLS_FS_IO

without the -DMBEDTLS_FS_IO flag, you'll get various errors in mbedtls.c like:

error: implicit declaration of function 'mbedtls_x509_crt_parse_file' [-Werror=implicit-function-declaration]
     ret = mbedtls_x509_crt_parse_file(&connssl->cacert, ssl_cafile);

1. "make" again and it should be successful.

[mgleason]

Oops, hadn't actually included curl yet. Now that I've added "#include ", the following errors are generated:

/Users/jeff/Dev/esp/i2s/build/curl/libcurl.a(mbedtls.o):(.literal.mbed_connect_common+0x8c): undefined reference to mbedtls_x509_crt_parse_file' /Users/jeff/Dev/esp/i2s/build/curl/libcurl.a(mbedtls.o):(.literal.mbed_connect_common+0x90): undefined reference tombedtls_x509_crt_parse_path'
/Users/jeff/Dev/esp/i2s/build/curl/libcurl.a(mbedtls.o):(.literal.mbed_connect_common+0x94): undefined reference to mbedtls_pk_parse_keyfile' /Users/jeff/Dev/esp/i2s/build/curl/libcurl.a(mbedtls.o):(.literal.mbed_connect_common+0x98): undefined reference tombedtls_x509_crl_parse_file'
/Users/jeff/Dev/esp/i2s/build/curl/libcurl.a(mbedtls.o): In function mbed_connect_step1': /Users/jeff/Dev/esp/i2s/components/curl/lib/vtls/mbedtls.c:996: undefined reference tombedtls_x509_crt_parse_file'
/Users/jeff/Dev/esp/i2s/components/curl/lib/vtls/mbedtls.c:996: undefined reference to mbedtls_x509_crt_parse_path' /Users/jeff/Dev/esp/i2s/components/curl/lib/vtls/mbedtls.c:996: undefined reference tombedtls_x509_crt_parse_file'
/Users/jeff/Dev/esp/i2s/components/curl/lib/vtls/mbedtls.c:996: undefined reference to mbedtls_pk_parse_keyfile' /Users/jeff/Dev/esp/i2s/components/curl/lib/vtls/mbedtls.c:996: undefined reference tombedtls_x509_crl_parse_file'

[nkolban]

Find me on #ESP32 ... we'll go for round 2 :-)

[nkolban]

I have a new guess ... are you using the VERY latest ESP-IDF distribution ... see the following which was added in March 2017. This would be consistent with the problems described ...

https://github.com/espressif/esp-idf/commit/74817c35f3826939337f911263b210f9b7a60efe

If your ESP-IDF is back-level to this ... this would be the problem and the solution would be to use the latest ESP-IDF.

[mgleason]

That seems to be it! I'm putting together a small test to see if it all works...

[nkolban]

If it works, the recipe in this thread needs to be changed to remove -DMBEDTLS_FS_IO which is now the default.

[mgleason]

Yes, seems to work well. Tested it with your testCurl.c code (modified to use example.com instead of the raspberrypi:) successfully returned " ..." Interestingly, I believe it worked even with -DMBEDTLS_FS_IO. Next I need to configure TLS/SSL. Luckily I've got your book!

1. To ensure I was on the latest esp-idf distribution, I needed to clone it from Git. But, since I originally installed esp-idf following the "official" DevKit and esp-idf "Getting Started Guide"s, I moved the /esp-idf folder to a safe backup location (and later deleted it).
2. git clone --recursive https://github.com/espressif/esp-idf.git
   ...or, if you already installed it from Git...
   git pull
   git submodule update --init --recursive
3. cd to your project folder, edit "component.mk" and remove the "-DMBEDTLS_FS_IO" flag - so the last line reads:
   CFLAGS+=-DHAVE_CONFIG_H -DBUILDING_LIBCURL

Awesome, thanks again - don't know how you do it!

[hassfers]

i have a similar question,
i get an compilation error during the first build caused by error: unknown type name 'curl_off_t'.
do you know where this came from?

[nkolban]

The curl_off_t issue has been tracked down and resolved in this issue:

https://github.com/nkolban/esp32-snippets/issues/18

[nkolban]

closing with completion. Don't hesitate to re-open as needed.