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[msvc] Strip /W[0-4] before appending /W4

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Certain versions of CMake specify /W3 as part of CMAKE_CXX_FLAGS
by default, before you do anything.  Appending /W4 to the end of
this and using the Ninja generator results in

cl : Command line warning D9025 : overriding '/W3' with '/W4'.

It is not possible to suppress this since it is a command line
warning and not a compiler warning, so we must fix the command
line to contain only one value for /Wn.

llvm-svn: 234907
This commit is contained in:
Zachary Turner 2015-04-14 16:57:54 +00:00
parent 74f370958b
commit 8e996791d5
1 changed files with 7 additions and 0 deletions
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7
cmake/modules/HandleLLVMOptions.cmake
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@ -315,6 +315,13 @@ if( MSVC )
# Enable warnings
if (LLVM_ENABLE_WARNINGS)
append("/W4" msvc_warning_flags)
# CMake appends /W3 by default, and having /W3 followed by /W4 will result in
# cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is
# a command line warning and not a compiler warning, it cannot be suppressed except
# by fixing the command line.
string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
if (LLVM_ENABLE_PEDANTIC)
# No MSVC equivalent available
endif (LLVM_ENABLE_PEDANTIC)