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Date Submitted

Last Update

0015866

CMake

public

2015-11-28 15:15

2016-06-10 14:31

Reporter

temp4746

Assigned To

Kitware Robot

Priority

normal

Severity

feature

Reproducibility

always

Status

closed

Resolution

moved

Platform

Windows

OS Version

Product Version

CMake 3.4

Target Version

Fixed in Version

Summary

0015866: CMake should work around D9025 when using NMake Makefiles generator

Description

When using the Visual Studio IDE generators CMake maps compiler/linker flags supported by the IDE to the vcxproj properties. This as a side effect prevents passing multiple conflicting flags for most commonly used compiler/linker flags, such as "/W[0-4]".

This is not done for NMake Makefiles, this means when you use them and additionally use something like:
target_compile_options(target PRIVATE /W0)

You will receive D9025 warnings.

This warning is because the cl compiler is annoying and unlike gcc/clang will emit a warning (D9025) when there are conflicting flags and still use the later flag in the command line like expected.

I think CMake should work around this by removing conflicting flags leaving only the latest one on the command line, similar to what you get when you use the IDE project files. At least for the commonly used flags or ones that exist in the IDE project files as specific properties.

Steps To Reproduce

cmake_minimum_required(VERSION 3.4)
project(flags)
add_library(a STATIC a.cpp)
target_compile_options(a PRIVATE /W4)

Try this both with an MSVC IDE and NMake Makefiles.

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Notes
(0042894) Kitware Robot (administrator) 2016-06-10 14:29	Resolving issue as `moved`. This issue tracker is no longer used. Further discussion of this issue may take place in the current CMake Issues page linked in the banner at the top of this page.

Issue History
Date Modified	Username	Field	Change
2015-11-28 15:15	temp4746	New Issue
2016-06-10 14:29	Kitware Robot	Note Added: 0042894
2016-06-10 14:29	Kitware Robot	Status	new => resolved
2016-06-10 14:29	Kitware Robot	Resolution	open => moved
2016-06-10 14:29	Kitware Robot	Assigned To	=> Kitware Robot
2016-06-10 14:31	Kitware Robot	Status	resolved => closed