• Bill Somerville's avatar
    GetPrerequisites: Optionally filter "objdump" output for speed · 5d0a8b1a
    Bill Somerville authored
    As dumpbin.exe is no longer reliable for gcc libraries on MinGW because
    it crashes on many common libraries like libgcc_s and libgfortran it is
    now necessary too resort to using objdump for DLL dependency walking.
    Using objdump has a secondary problem in that it generates a lot of
    output for large libraries and causes fixup_bundle() to take many
    minutes to process what took fractions of a second with
    "dumpbin.exe /dependents".
    
    Add a 'grep' pre-filter in the execute_process() command pipeline to
    reduce this output to a minimum for a several orders of magnitude speed
    up.  If grep is not available just use the full output.
    
    As there does not seem to be a reliable way of detecting MinGW, callers
    of fixup_bundle() may have to set the variable gp_tool to "objdump" if
    dumpbin.exe is installed on the build machine to stop it using the
    broken MS dumpbin.exe for library dependency walking.
    5d0a8b1a
GetPrerequisites.cmake 30.8 KB