MantisBT - CMake
View Issue Details

ID	Project	Category	View Status	Date Submitted	Last Update
0014099	CMake	CMake	public	2013-04-19 07:05	2014-10-06 10:33

Reporter	Andrey Kamaev
Assigned To	Peter Kuemmel
Priority	normal	Severity	major	Reproducibility	always
Status	closed	Resolution	fixed
Platform	Linux	OS		OS Version
Product Version	CMake 2.8.10.2
Target Version		Fixed in Version	CMake 3.0

Summary	0014099: Ninja: CMAKE_${LANG}_FLAGS passed to linker come from incorrect scope
Description	Library/module linker is always called with same compiler flags. CMake embeds CMAKE_${LANG}_FLAGS from the scope of the first library met by generator into the generic link rule and uses it for all targets of the same type. But CMAKE_${LANG}_FLAGS variables are directory scoped and should be different. Looking into the CMake code I found that any platform having <LANGUAGE_COMPILE_FLAGS> in link command is affected.
Steps To Reproduce	The minimal reproducer is attached. In short: CMakeLists.txt from the topmost directory: cmake_minimum_required(VERSION 2.8.8) project(level0) set(CMAKE_CXX_FLAGS -msse2 ) # flag itself does not matter add_library(lelve0 SHARED level0.cpp) add_subdirectory(l1) CMakeLists.txt from sub-directory: project(level1) set(CMAKE_CXX_FLAGS -mno-sse2 ) add_library(lelve1 SHARED level1.cpp) Resulting link commands from Ninja: /usr/bin/c++ -fPIC -msse2 -shared -Wl,-soname,liblelve0.so -o liblelve0.so CMakeFiles/lelve0.dir/level0.cpp.o /usr/bin/c++ -fPIC -msse2 -shared -Wl,-soname,liblelve1.so -o l1/liblelve1.so l1/CMakeFiles/lelve1.dir/level1.cpp.o Link commands used by make: /usr/bin/c++ -fPIC -msse2 -shared -Wl,-soname,liblelve0.so -o liblelve0.so CMakeFiles/lelve0.dir/level0.cpp.o /usr/bin/c++ -fPIC -mno-sse2 -shared -Wl,-soname,liblelve1.so -o liblelve1.so CMakeFiles/lelve1.dir/level1.cpp.o
Additional Information
Tags	No tags attached.
Relationships
Attached Files	repro.tar.bz2 (469) 2013-04-19 07:05 https://public.kitware.com/Bug/file/4747/repro.tar.bz2

Issue History
Date Modified	Username	Field	Change
2013-04-19 07:05	Andrey Kamaev	New Issue
2013-04-19 07:05	Andrey Kamaev	File Added: repro.tar.bz2
2014-04-13 05:00	Peter Kuemmel	Severity	minor => major
2014-04-13 08:49	Peter Kuemmel	Assigned To	=> Peter Kuemmel
2014-04-13 08:49	Peter Kuemmel	Status	new => assigned
2014-04-13 08:50	Peter Kuemmel	Note Added: 0035684
2014-04-13 08:50	Peter Kuemmel	Status	assigned => resolved
2014-04-13 08:50	Peter Kuemmel	Fixed in Version	=> CMake 3.0
2014-04-13 08:50	Peter Kuemmel	Resolution	open => fixed
2014-10-06 10:33	Robert Maynard	Note Added: 0036969
2014-10-06 10:33	Robert Maynard	Status	resolved => closed

Notes