Installing gtest with conan - googletest

Question

I am about to change to conan, in the hope that is will simplify installing my package by my users. It was OK, until I started to add gtest to my package.
During install, I receive messages
gtest/1.8.1#bincrafters/stable: Package installed
conanfile.txt imports(): Copied 4 '.a' files: libgmockd.a, libgtestd.a, libgmock_maind.a, libgtest_maind.a
However, during build I receive:
/usr/bin/ld: cannot find -lgmock_maind
/usr/bin/ld: cannot find -lgmockd
/usr/bin/ld: cannot find -lgtestd
My CMakeLists.txt file contains
target_link_libraries(
${PROJECT_NAME}_GTEST
Modules
${CONAN_LIBS}
)
What is missing? Shall I provide some
link_directories(?)
argument?
(In the meantime, after some trials, I succeeded: Not only
link_directories(${CONAN_LIB_DIRS_GTEST})
is needed, but also conan's .data must be cleared.)

Answer 1

What generator are you using?
I have this in my conanfile.txt requires section
gtest/[~=1.8]#bincrafters/stable
This is what I have for generators in that section
cmake_find_package
cmake_paths
And in the CMakeLists.txt
include(${CMAKE_BINARY_DIR}/conan_paths.cmake)
find_package(gtest REQUIRED)
add_dependencies(something gtest::gtest)
target_link_libraries(something gtest::gtest)
Note that FindGTest is a built in module, but Findgtest.cmake is a file generated by conan in the build directory.

Answer 2

The Bincrafters package for gtest is marked as obsolete, you should use the one in the conan center.
For that, simply add the conan recipe to the conanfile.txt/py.
Let's say you use a plain conanfile.txt:
# conanfile.txt
[requires]
gtest/1.10.0
[generators]
cmake
Then you can run conan install
Then add the conan instructions to your project's CMakeLists.txt:
include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
conan_basic_setup()
target_link_libraries(${PROJECT_NAME} ${CONAN_LIBS})
You may print a message to see the included libraries:
message("-- Conan libs: ${CONAN_LIBS}").
This should include both gtest and gmock.
Finally, just include the header, and use the framework:
#include "gtest/gtest.h"
TEST(TestName, Foo)
{
EXPECT_TRUE(true);
}