CODEWITHSUNDEEP
c++c++11compilationcmakec++14
eduherminio
eduherminio

Reputation: 1674

CMake fails identifying C++ compiler version in new builds

Something quite weird is happening to me: CMake fails to choose the correct version of g++ only if I compile a project for the first time (or I delete 'build' folder).

So a 'fresh' compilation brings error when using auto but if I compile it again, everything goes smoothly (until I delete 'build' folder).

Here you are my files:

CMakeLists.txt

file(GLOB_RECURSE SOURCES
    include/*.h
    src/*.cpp
)

SET(CMAKE_CXX_FLAGS "-std=c++14")

set(filename $ENV{env_filename})

cmake_minimum_required(VERSION 2.8)
project( filename )
add_executable( ${filename} ${filename}.cpp ${SOURCES})

compile.sh

#!/bin/bash
clear
set -e
source filedata.txt
export env_filename=$filename
mkdir -p build && cd build
cmake ..  &> /dev/null
make -B
./$filename

filedata.txt

filename="1_Example"

Thanks in advance,

Eduardo

Upvotes: 0

Views: 169

Answers (1)

Simon Hyll
Simon Hyll

Reputation: 3608

Can't really help you with the actual error, BUT...

Why do you use set -e? You shouldn't skip errors, you should fix them...

Your CMakeLists.txt is also incorrectly structured. You should at the very first lines have:

cmake_minimum_required(VERSION 2.8)
project( filename )

Otherwise it's considered incorrect. It might work but it shouldn't. Before running CMake commands you have to specify what version is required to run the file.

Your SOURCES entries should have double quotes around them.

UPDATE

Turns out putting cmake_minimum_requirement(VERSION 2.8) first fixed it for the OP. After that point not much is required structurally in CMake, you can use your common sense for the rest, but having the version requirement first is a must.

Upvotes: 1

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