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/usr/share/codeblocks/compilers/options_clang.xml is in codeblocks-common 13.12-3.

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<?xml version="1.0"?>
<!DOCTYPE CodeBlocks_compiler_options>
<CodeBlocks_compiler_options>
    <if platform="windows">
        <Program name="C"         value="clang.exe"/>
        <Program name="CPP"       value="clang++.exe"/>
        <Program name="LD"        value="clang++.exe"/>
        <Program name="DBGconfig" value="gdb_debugger:Default"/>
        <Program name="LIB"       value="llvm-ar.exe"/>
        <if exec="llvm-ar.exe -version">
            <!-- found, do nothing -->
        </if>
        <else>
            <if exec="ar.exe --version">
                <!-- use GNU archiver -->
                <Program name="LIB" value="ar.exe"/>
            </if>
        </else>
        <Program name="WINDRES"   value="windres.exe"/>
        <Program name="MAKE"      value="mingw32-make.exe"/>
    </if>
    <else>
        <Program name="C"         value="clang"/>
        <Program name="CPP"       value="clang++"/>
        <Program name="LD"        value="clang++"/>
        <Program name="DBGconfig" value="gdb_debugger:Default"/>
        <Program name="LIB"       value="llvm-ar"/>
        <if exec="llvm-ar -version">
            <!-- found, do nothing -->
        </if>
        <else>
            <if exec="ar --version">
                <!-- use GNU archiver -->
                <Program name="LIB" value="ar"/>
            </if>
        </else>
        <Program name="WINDRES"   value=""/>
        <Program name="MAKE"      value="make"/>
    </else>

    <Switch name="includeDirs"             value="-I"/>
    <Switch name="libDirs"                 value="-L"/>
    <Switch name="linkLibs"                value="-l"/>
    <Switch name="defines"                 value="-D"/>
    <Switch name="genericSwitch"           value="-"/>
    <Switch name="objectExtension"         value="o"/>
    <Switch name="needDependencies"        value="true"/>
    <Switch name="forceCompilerUseQuotes"  value="false"/>
    <Switch name="forceLinkerUseQuotes"    value="false"/>
    <Switch name="logging"                 value="default"/>
    <Switch name="libPrefix"               value="lib"/>
    <Switch name="libExtension"            value="a"/>
    <Switch name="linkerNeedsLibPrefix"    value="false"/>
    <Switch name="linkerNeedsLibExtension" value="false"/>
    <Switch name="UseFullSourcePaths"      value="true"/>

    <Category name="Debugging">
        <Option name="Produce minimal debugging symbols"
                option="-gline-tables-only"
                checkAgainst="-O1 -O2 -Os -O3 -O4"
                checkMessage="You have optimizations enabled. This is Not A Good Thing(tm) when producing debugging symbols..."
                supersedes="-s -g"/>
        <Option name="Produce full debugging symbols"
                option="-g"
                checkAgainst="-O1 -O2 -Os -O3 -O4"
                checkMessage="You have optimizations enabled. This is Not A Good Thing(tm) when producing debugging symbols..."
                supersedes="-s -gline-tables-only"/>
    </Category>

    <Category name="Warnings">
        <Option name="Have clang++ follow the 1998 ISO C++ language standard"
                option="-std=c++98"
                supersedes="-std=c++0x -std=c++11"/>
        <Option name="Have clang++ follow the coming C++0x ISO C++ language standard"
                option="-std=c++0x"
                supersedes="-std=c++98 -std=c++11"/>
        <Option name="Have clang++ follow the C++11 ISO C++ language standard"
                option="-std=c++11"
                supersedes="-std=c++98 -std=c++0x"/>
        <Option name="Enable all common compiler warnings"
                option="-Wall"
                supersedes="-w"/>
        <Option name="Enable all warnings"
                option="-Weverything"
                supersedes="-w"/>
        <Option name="Disable all warnings"
                option="-w"
                supersedes="-Wall -Weverything"/>
        <Option name="Turn warnings into errors"
                option="-Werror"/>
        <Option name="Warn on language extensions"
                option="-pedantic"/>
        <Option name="Error on language extensions"
                option="-pedantic-errors"/>
        <Option name="Enable warnings from system headers"
                option="-Wsystem-headers"/>
        <Option name="Warn about excess tokens in preprocessor directives"
                option="-Wextra-tokens"/>
        <Option name="Warn about unqualified uses of member templates"
                option="-Wambiguous-member-template"/>
        <Option name="Warn about unusable copy constructors when binding references to temporaries"
                option="-Wbind-to-temporary-copy"/>
        <Option name="Warn if a class has virtual functions but no virtual destructor"
                option="-Wnon-virtual-dtor"/>
    </Category>

    <Category name="Optimization">
        <Option name="Strip all symbols from binary (minimizes size)"
                additionalLibs="-s"
                supersedes="-g -gline-tables-only"/>
        <Option name="Optimize generated code"
                option="-O1"
                checkAgainst="-g -gline-tables-only"
                checkMessage="You have debugging symbols enabled. This is Not A Good Thing(tm) when optimizing..."
                supersedes="-O2 -Os -O3 -O4"/>
        <Option name="Optimize more"
                option="-O2"
                checkAgainst="-g -gline-tables-only"
                checkMessage="You have debugging symbols enabled. This is Not A Good Thing(tm) when optimizing..."
                supersedes="-O1 -Os -O3 -O4"/>
        <Option name="Optimize more (for size)"
                option="-Os"
                checkAgainst="-g -gline-tables-only"
                checkMessage="You have debugging symbols enabled. This is Not A Good Thing(tm) when optimizing..."
                supersedes="-O1 -O2 -O3 -O4"/>
        <Option name="Optimize even more (for speed)"
                option="-O3"
                checkAgainst="-g -gline-tables-only"
                checkMessage="You have debugging symbols enabled. This is Not A Good Thing(tm) when optimizing..."
                supersedes="-O1 -O2 -Os -O4"/>
        <Option name="Optimize even more (with link time optimization)"
                option="-O4"
                checkAgainst="-g -gline-tables-only"
                checkMessage="You have debugging symbols enabled. This is Not A Good Thing(tm) when optimizing..."
                supersedes="-O1 -O2 -Os -O3"/>
        <Option name="Don't keep the frame pointer in a register for functions that don't need one"
                option="-fomit-frame-pointer"
                category="Optimization"
                checkAgainst="-g -gline-tables-only"
                checkMessage="You have debugging symbols enabled. This is Not A Good Thing(tm) when optimizing..."/>
    </Category>

    <Category name="Code generation">
        <Option name="Runtime check for undefined behavior"
                option="-fcatch-undefined-behavior"/>
        <Option name="Catch integer overflow errors"
                option="-ftrapv"/>
        <Option name="Use AddressSanitizer, a memory error detector"
                option="-faddress-sanitizer"/>
        <Option name="Use ThreadSanitizer, a data race detector"
                option="-fthread-sanitizer"/>
        <Option name="Use thread local storage model 'global-dynamic'"
                option="-ftls-model=global-dynamic"
                supersedes="-ftls-model=local-dynamic -ftls-model=initial-exec -ftls-model=local-exec"/>
        <Option name="Use thread local storage model 'local-dynamic'"
                option="-ftls-model=local-dynamic"
                supersedes="-ftls-model=global-dynamic -ftls-model=initial-exec -ftls-model=local-exec"/>
        <Option name="Use thread local storage model 'initial-exec'"
                option="-ftls-model=initial-exec"
                supersedes="-ftls-model=global-dynamic -ftls-model=local-dynamic -ftls-model=local-exec"/>
        <Option name="Use thread local storage model 'local-exec'"
                option="-ftls-model=local-exec"
                supersedes="-ftls-model=global-dynamic -ftls-model=local-dynamic -ftls-model=initial-exec"/>
        <Option name="Enable support for Microsoft extensions"
                option="-fms-extensions"/>
    </Category>

    <Command name="CompileObject"
             value="$compiler $options $includes -c $file -o $object"/>
    <Command name="GenDependencies"
             value="$compiler -MM $options -MF $dep_object -MT $object $includes $file"/>
    <Command name="CompileResource"
             value="$rescomp $res_includes -J rc -O coff -i $file -o $resource_output"/>
    <Command name="LinkConsoleExe"
             value="$linker $libdirs -o $exe_output $link_objects $link_resobjects $link_options $libs"/>
    <if platform="windows">
        <Command name="LinkNative"
                 value="$linker $libdirs -o $exe_output $link_objects $link_resobjects $link_options $libs -Wl,--subsystem,native"/>
        <Command name="LinkExe"
                 value="$linker $libdirs -o $exe_output $link_objects $link_resobjects $link_options $libs -mwindows"/>
        <Command name="LinkDynamic"
                 value="$linker -shared -Wl,--output-def=$def_output -Wl,--out-implib=$static_output -Wl,--dll $libdirs $link_objects $link_resobjects -o $exe_output $link_options $libs"/>
    </if>
    <else>
        <Command name="LinkNative"
                 value="$linker $libdirs -o $exe_output $link_objects $link_resobjects $link_options $libs"/>
        <Command name="LinkExe"
                 value="$linker $libdirs -o $exe_output $link_objects $link_resobjects $link_options $libs"/>
        <Command name="LinkDynamic"
                 value="$linker -shared $libdirs $link_objects $link_resobjects -o $exe_output $link_options $libs"/>
    </else>
    <Command name="LinkStatic"
             value="$lib_linker -r -s $static_output $link_objects"/>
    <Common name="cmds"/>

    <Common name="re"/>
</CodeBlocks_compiler_options>