How to build curl from scratch using cmake, including building libcurl, and then how to use it to build and run the C examples
The answer from @Stephen.Harris works.
Here is my final version, based off of that answer:
time git clone https://github.com/curl/curl.git
cd curl
mkdir -p build
cd build
time cmake .. # takes ~20 sec
time make # takes ~11 sec
time sudo make install # takes < 1 sec
cd ../.. # go back up to the same level as where the `curl` dir is
Now update your LD_LIBRARY_PATH variable to contain the path to curl/build/lib, so that your loader will automatically load the dynamic .so shared library whenever you run an executable requiring it. See: https://stackoverflow.com/a/37558191/4561887 and https://www.cprogramming.com/tutorial/shared-libraries-linux-gcc.html:
echo "export LD_LIBRARY_PATH=\"$(pwd)/curl/build/lib:\$LD_LIBRARY_PATH\"" >> ~/.bashrc
. ~/.bashrc # re-source it
Now, you have the libcurl.so shared object dynamic library located at /usr/local/lib/libcurl.so and curl/build/lib/libcurl.so, and the curl executable is at curl/build/src/curl.
You can now build and run the examples, for instance, curl/docs/examples/10-at-a-time.c, like this:
time ( \
time g++ -Wall -Wextra -Werror -O3 -std=c++17 \
curl/docs/examples/10-at-a-time.c \
-lcurl \
-o bin/a \
&& time bin/a \
)
Correction though: we should build the examples as C with gcc, rather than as C++ with g++ (even though the first one at least does build and run as C++ too).
Final answer:
time ( \
time gcc -Wall -Wextra -Werror -O3 -std=c17 \
curl/docs/examples/10-at-a-time.c \
-lcurl \
-o bin/a \
&& time bin/a \
)
Sample run and output:
eRCaGuy_hello_world/cpp$ time ( \
> time g++ -Wall -Wextra -Werror -O3 -std=c++17 \
> curl/docs/examples/10-at-a-time.c \
> -lcurl \
> -o bin/a \
> && time bin/a \
> )
real 0m0.139s
user 0m0.085s
sys 0m0.024s
R: 0 - No error <https://www.ibm.com>
R: 0 - No error <https://www.iana.org>
R: 0 - No error <https://www.oracle.com>
R: 0 - No error <https://www.amazon.com>
R: 0 - No error <https://www.google.com>
R: 0 - No error <https://www.ripe.net>
R: 0 - No error <https://www.mysql.com>
R: 0 - No error <https://www.netcraft.com>
R: 0 - No error <https://www.mozilla.org>
R: 0 - No error <https://www.yahoo.com>
R: 0 - No error <https://opensource.org>
R: 0 - No error <https://www.ca.com>
R: 0 - No error <https://www.chip.de>
R: 0 - No error <https://www.hp.com>
R: 0 - No error <https://www.wikipedia.org>
R: 0 - No error <https://www.cnn.com>
R: 0 - No error <https://www.dell.com>
R: 0 - No error <https://www.mit.edu>
R: 0 - No error <https://www.playstation.com>
R: 0 - No error <https://www.apple.com>
R: 0 - No error <https://www.symantec.com>
R: 0 - No error <https://www.uefa.com>
R: 0 - No error <https://www.ebay.com>
R: 0 - No error <https://www.ieee.org>
R: 0 - No error <https://www.fujitsu.com/global/>
R: 0 - No error <https://www.supermicro.com>
R: 0 - No error <https://www.hotmail.com>
R: 0 - No error <https://www.nist.gov>
R: 0 - No error <https://www.cert.org>
R: 0 - No error <https://www.zdnet.com>
R: 0 - No error <https://www.cnet.com>
R: 0 - No error <https://www.ietf.org>
R: 0 - No error <https://news.google.com>
R: 0 - No error <https://www.bbc.co.uk>
R: 0 - No error <https://www.usatoday.com>
R: 0 - No error <https://www.foxnews.com>
R: 0 - No error <https://www.wired.com>
R: 0 - No error <https://www.sky.com>
R: 0 - No error <https://www.cbs.com>
R: 0 - No error <https://slashdot.org>
R: 0 - No error <https://www.msn.com>
R: 0 - No error <https://www.un.org>
R: 0 - No error <https://apache.org>
R: 0 - No error <https://www.nbc.com/>
R: 0 - No error <https://www.informationweek.com>
R: 0 - No error <https://www.heise.de>
R: 0 - No error <https://www.microsoft.com>
real 0m10.476s
user 0m0.892s
sys 0m0.096s
real 0m10.615s
user 0m0.978s
sys 0m0.121s
Going further:
- You can see even more details of what I've learned in my readme notes here: C
curl library installation & setup
