Unsupported protocol while download tar.gz package

Question

I have just upgrade my CMake from version 2.8 to 3.2.

It\'s working like a charm in CMake 2.8 but, after the upgrade, it\'s failing.

I\'m trying to build thi

Answer 1

I was having the same problem building a library in a computer in which CMake had not support to https protocol.

I had to build cmake myself with the option -DCMAKE_USE_OPENSSL=ON as suggested by @dekkard's comment.

Answer 2

I will often just modify the url from https to http.

Answer 3

In my ExternalProject_Add(), I have use GIT_REPOSITORY insted of URL option.

#URL https://github.com/keplerproject/luacov/archive/v0.7.tar.gz
GIT_REPOSITORY https://github.com/keplerproject/luacov.git

And luacov download and build successfully.

For any https protocol use DOWNLOAD_COMMAND option of ExternalProject_Add() function.

DOWNLOAD_COMMAND wget https://github.com/keplerproject/luacov/archive/v0.7.tar.gz

and its working as expected.

Thanks.

Answer 4

The problem may be that the CURL library shipped with CMake isn't build with SSL support by default. I had to compile cmake with:

./bootstrap --system-curl
make
sudo make install

... and that worked, because my system's curl has SSL support.

Answer 5

Looks like with Cmake 3.2.1 it works as expected.

Here's my sample project/CMakeLists.txt:

PROJECT(TestDownload)

SET(CMAKE_CXX_COMPILER "/path/to/bin/g++")
SET(CMAKE_C_COMPILER "/path/to/bin/gcc")

SET(CMAKE_CXX_FLAGS "")
SET(CMAKE_C_FLAGS "")

cmake_minimum_required(VERSION 3.2)
include(ExternalProject)

ExternalProject_Add(
  luacov
  URL https://github.com/keplerproject/luacov/archive/v0.7.tar.gz
  DOWNLOAD_DIR ${CMAKE_CURRENT_BINARY_DIR}/luacov
  UPDATE_COMMAND ""
  PATCH_COMMAND ""
  INSTALL_COMMAND ""
)

And the commands:

$ cd project
$ mkdir build && cd build
$ cmake ..
...
$ make all
Scanning dependencies of target luacov
[ 12%] Creating directories for 'luacov'
[ 25%] Performing download step (download, verify and extract) for 'luacov'
-- downloading...
     src='https://github.com/keplerproject/luacov/archive/v0.7.tar.gz'
     dst='/tmp/project/build/luacov/v0.7.tar.gz'
     timeout='none'
-- [download 7% complete]
-- [download 21% complete]
-- [download 76% complete]
-- [download 100% complete]
-- downloading... done
-- verifying file...
     file='/tmp/project/build/luacov/v0.7.tar.gz'
-- verifying file... warning: did not verify file - no URL_HASH specified?
-- extracting...
     src='/tmp/project/build/luacov/v0.7.tar.gz'
     dst='/tmp/project/build/luacov-prefix/src/luacov'
-- extracting... [tar xfz]
-- extracting... [analysis]
-- extracting... [rename]
-- extracting... [clean up]
-- extracting... done
[ 37%] No patch step for 'luacov'
[ 50%] No update step for 'luacov'
...

Answer 6

What it worked for me is the following:

1. Update openssl

   sudo apt-get install openssl libssl-dev
   

2. Modify bootstrap file to enable CMAKE_USE_OPENSSL. Replace this line by:

   cmake_options="-DCMAKE_BOOTSTRAP=1 -DCMAKE_USE_OPENSSL=ON"
   

3. Run bootstrap script normally in cmake folder

   /@path_to_cmake/bootstrap