Friday, October 29, 2021

[SOLVED] cmake equivalent for MakeFile

Issue

I followed this answer to create a CMakeLists.txt for a simple Makefile

Makefile

CC = g++
INCFLAGS = -I/usr/local/include/embree3
LDFLAGS = -L"/usr/local/lib/" -lembree3
RM  = /bin/rm -f

all:
    $(CC) -o main main.cpp $(INCFLAGS) $(LDFLAGS)
clean:
    $(RM) *.o main

CMakeLists.txt

cmake_minimum_required(VERSION 3.1.0)
project(aaf_project_impl)

include_directories(/usr/local/include/embree3) # -I flags for compiler
link_directories(/usr/local/lib/) # -L flags for linker

add_executable(main main.cpp)

target_link_libraries(main embree)   # -l flags for linking prog target

The Makefile compiles properly and the executable runs without any issues. And to use the cmake file, I do the following (assuming I am in source directory)

  1. mkdir build
  2. cd build
  3. cmake ..
  4. make

The make in step 4 throws the following error

main.cpp:4:10: fatal error: 'embree3/rtcore.h' file not found
#include <embree3/rtcore.h>
         ^~~~~~~~~~~~~~~~~~
1 error generated.
make[2]: *** [CMakeFiles/main.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/main.dir/all] Error 2
make: *** [all] Error 2

I installed embree from source by cloning the git repo. I am using Macbook M1 (MacOS Big Sur 11.5.1).

I am very new to cmake (started using it a day ago) so I apologize if this is a rather silly question.


Solution

Ok, so following your answer to my comments, the problem is that since you starts your include instruction by embree3 (which make sense to avoid names conflict), cmake should have as include directory the directory containing the embree3 installation, not the embree3 folder itself.

This is why include_directories(/usr/local/include) is working instead of include_directories(/usr/local/include/embree3).



Answered By - Laurent Jospin
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