CODEWITHSUNDEEP
c++compiler-errorscmakecompiler-flags
Tarion
Tarion

Reputation: 17134

Why does CMake skips the -I Flag from the g++ command line

I have a working C project and just added some CPP stuff.

For includes I use include_directories("./src/") but the resulting commandline that is called from the generated makefile only contains "./src/" instead of the expected -I"./src/"

Whats going wrong with cmake here? Do I miss any difference between the C and the CPP compiler? Whe I add the -I to the commandline it just compiles as expected.

Upvotes: 1

Views: 75

Answers (2)

Serge Rogatch
Serge Rogatch

Reputation: 15020

For me it was skipping -I/usr/local/cuda/include for .cpp files compiled with clang++-18, even though I tried include_directories( ${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES} ) and target_include_directories with the same. So I had to just addd a line to CMAkeLists.txt like this:

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I/usr/local/cuda/include ")

Upvotes: 0

Tarion
Tarion

Reputation: 17134

For everyone who finds the same Symptoms, it has nothing to do with it just missed the CXX in my project:

Changed

project(my-project C ASM)

to

project(my-project C CXX ASM)

Now it works... I hope it will save someone else the few hours I spend on this.

Upvotes: 2

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