[CMake] MSVC71 WholeProgramOptimization flags (/LTCG and /GL)

[Luke Kucalaba]

Problem solved! I finally found some time today to checkout the CMake
source code and get setup for development. I started the build and found
the answer I was looking for in
cmLocalVisualStudio7Generator::OutputBuildTool() :

    const char* tool = "VCLibrarianTool";
    fout << "\t\t\t<Tool\n"
         << "\t\t\t\tName=\"" << tool << "\"\n";
    if(const char* libflags =
target.GetProperty("STATIC_LIBRARY_FLAGS"))
      {
      fout << "\t\t\t\tAdditionalOptions=\"" << libflags << "\"\n";
      }

Here is the solution that worked for me... if you have a similar problem
you can use the same concept for your situation:

        If(WIN32 AND MSVC71)
            String(REGEX MATCH "/GL" matchResult
"${compilerFlagsDebug}")
            If(matchResult)
                Set_Target_Properties("${targetFilenameDebug}"
PROPERTIES 
                    STATIC_LIBRARY_FLAGS "/LTCG"
                )
            EndIf()
            
            String(REGEX MATCH "/GL" matchResult
"${compilerFlagsRelease}")
            If(matchResult)
                Set_Target_Properties("${targetFilenameRelease}"
PROPERTIES 
                    STATIC_LIBRARY_FLAGS "/LTCG"
                )
            EndIf()
        EndIf()

Thanks again for everything. Our build system is now completely free of
errors and warnings!

Luke

 

________________________________

From: Luke Kucalaba 
Sent: Thursday, December 04, 2008 6:57 PM
To: cmake at cmake.org
Subject: MSVC71 WholeProgramOptimization flags (/LTCG and /GL)

 

Hi,

 

I would like to reopen issue #0006794 dealing with this linker warning
that is still present for MSVC 7.1 static library builds:

 

Linking CXX static library ..\build\MT-DLL\Util-SL.lib

XMLWriter.cpp.obj : warning LNK4218: non-native module found; restarting

 

I did some more investigation of this problem, and I think I've nailed
it down now. I thought it was the missing WholeProgramOptimization
element that was causing the warning, when in fact it is the missing
"/LTCG" flag that should be in the Librarian additional command-line
options. I realize that for a static library project the linker flags
are not included in the generated project file, but this should be an
exception case to that rule. As a general rule of thumb, if the /GL
compiler flag is passed to a static library project, then the /LTCG flag
should be passed to the Librarian AdditionalOptions line.

 

            <Tool

                Name="VCLibrarianTool"

                AdditionalOptions="/LTCG">

 

Thank you for your time and effort. I appreciate the hard work that you
have all done to make and keep CMake a high-quality software product.

 

Sincerely,

Luke

 

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