[cmake-developers] ninja generator does NOT use absolute paths at rules?

[Claus Klein]

Hi,

I found it strange, the clang-tidy warnings contains only relative paths to header files?

Than I realized , the ninja.rules files contains NO absolute paths to target source and header files.

Is this a BUG or a desired feature?

// regards
Claus

--- compile_commands.json.make.gen      2019-07-22 22:21:44.000000000 +0200
+++ compile_commands.json.ninja.gen     2019-07-22 22:19:23.000000000 +0200
@@ -1,82 +1,97 @@
 [
 {
   "directory": "/Users/clausklein/Workspace/cpp/spdlog/build",
-  "command": "/opt/local/bin/clang++  -DSPDLOG_COMPILED_LIB -I/Users/clausklein/Workspace/cpp/spdlog/include  -O3 -DNDEBUG   -Wall -Wextra -Wconversion -pedantic -Werror -Wfatal-errors -std=c++11 -o CMakeFiles/spdlog.dir/src/spdlog.cpp.o -c /Users/clausklein/Workspace/cpp/spdlog/src/spdlog.cpp",
+  "command": "/opt/local/bin/clang++  -DSPDLOG_COMPILED_LIB -I../include  -O3 -DNDEBUG   -Wall -Wextra -Wconversion -pedantic -Werror -Wfatal-errors -std=c++11 -o CMakeFiles/spdlog.dir/src/spdlog.cpp.o -c /Users/clausklein/Workspace/cpp/spdlog/src/spdlog.cpp",
   "file": "/Users/clausklein/Workspace/cpp/spdlog/src/spdlog.cpp"
 },
+

Claus-MBP:spdlog clausklein$ make setup
mkdir -p build
ln -sf scripts/.clang-format .
ln -sf scripts/.clang-tidy .
cd build && cmake -G Ninja -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_CXX_COMPILER=/opt/local/bin/clang++ ..
-- use ccache
-- The CXX compiler identification is Clang 7.0.1
-- Check for working CXX compiler: /opt/local/bin/clang++
-- Check for working CXX compiler: /opt/local/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Build spdlog: 1.4.0
-- spdlog include path: /Users/clausklein/Workspace/cpp/spdlog/include
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - found
-- Found Threads: TRUE  
-- Build type: Release
-- Generating examples
-- Generating tests
-- Found PkgConfig: /usr/local/bin/pkg-config (found version "0.29.2") 
-- Checking for module 'libsystemd'
--   No package 'libsystemd' found
-- Generating install
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/clausklein/Workspace/cpp/spdlog/build
touch .configure
ln -sf /Users/clausklein/Workspace/cpp/spdlog/build/compile_commands.json .

Claus-MBP:spdlog clausklein$ grep -w include build/build.ninja | sort -u
  INCLUDES = -I../include
include rules.ninja
Claus-MBP:spdlog clausklein$ cmake --version
cmake version 3.14.5

CMake suite maintained and supported by Kitware (kitware.com/cmake).

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