CMake: can't import GLM 1.0.0-light

[clementperon]

Hi,

I have a project where I want to import GLM 1.0.0.

It was working previous with "complete source" with glm-0.9.9.8.zip

        FetchContent_Declare(
                glm
                # URL
                # https://github.com/g-truc/glm/releases/download/1.0.0/glm-1.0.0-light.zip
                URL ${CMAKE_CURRENT_SOURCE_DIR}/glm-1.0.0-light.zip
                URL_HASH
                        SHA256=bfd27ba33926fbdb341545b79e0ebc810f7b5e5593f9b0fe450cea1462950731
        )
        FetchContent_MakeAvailable(glm)

But it doesn't find the glm.hpp.
It seems that target_include_directories for the BUILD_INTERFACE is not correct

target_include_directories(glm-header-only INTERFACE
        "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>"
        "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
)

As it doesn't properly point to my "PROJECT_DIR/BUILD_DIR/_deps/glm-src/" but to "PROJECT_DIR" instead.

It's due to missing the CMakelist.txt at the root of the Zip archive which was present before.

cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
cmake_policy(VERSION 3.2)

set(GLM_VERSION "0.9.9")
project(glm VERSION ${GLM_VERSION} LANGUAGES CXX)
enable_testing()

add_subdirectory(glm)
add_library(glm::glm ALIAS glm)

if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})

add_subdirectory(test)

endif(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})

This CMakelist by calling Project() properly defined the Project Root which is not present anymore in the glm-xxx-light.zip

[xiaozhuai]

Hello @clementperon. Please drop fix_include.patch into your project and edit your CMakeLists.txt

     FetchContent_Declare(
                glm
                # URL
                # https://github.com/g-truc/glm/releases/download/1.0.0/glm-1.0.0-light.zip
                URL ${CMAKE_CURRENT_SOURCE_DIR}/glm-1.0.0-light.zip
                URL_HASH
                        SHA256=bfd27ba33926fbdb341545b79e0ebc810f7b5e5593f9b0fe450cea1462950731
                PATCH_COMMAND git apply "${CMAKE_CURRENT_SOURCE_DIR}/fix_include.patch"
                UPDATE_DISCONNECTED 1
        )

If this temporary workaround works for you, I'll submit a pr to fix it.

[clementperon]

Hello @xiaozhuai,

Thanks for the proposition,

Unfortunately, It doesn't fix it because the glm is extracted to

obj/dev/glm-src/glm.hpp

But source files looks to include

#include <glm/glm.hpp>

and not

#include <glm-src/glm.hpp>

I think it would be proper to have a glm folder no ?

Or I should change the name of the SOURCE_FOLDER but it's not really clean IMO

[christophe-lunarg]

Is this problem not due to the fact that the "light builds" didn't grab all the files?

I changed this with #1272 which makes the "light" builds generate zip packages the same way it used to be package, with all the files in 0.9.9.8.

[clementperon]

Is this problem not due to the fact that the "light builds" didn't grab all the files?

I changed this with #1272 which makes the "light" builds generate zip packages the same way it used to be package, with all the files in 0.9.9.8.

Hi, so there is two issues:

• First is that the light release doesn't define a new project() so the $PROJECT_SOURCE_DIR is wrong
• Second the glm.hpp is not in a "glm" sub-folder, so when I import the Project with FetchContent() I'm not able to keep the #include <glm/glm.hpp> but I should change it to #include <glm.hpp>

[pfirsich]

This breaks glm with FetchContent and I would be very thankful if this could be addressed.

EDIT: The real solution is not to use the light packages, but the source code zip: https://github.com/g-truc/glm/archive/refs/tags/1.0.1.zip