75196b99fb
lib.exe by default exits successfully without writing an output file when no inputs are passed. llvm-lib has the same behavior, for compatibility. This behavior interacts poorly with build systems: If a static library target had no inputs, llvm-lib would not produce an output file, causing ninja (or make, or a similar system) to successfully run that step, but then re-run it on the next build. After this patch, llvm-lib emits a warning in this case, that with /WX can be turned into an error. That way, ninja (or make, or...) will mark the initial build as failed. People who don't like the warning can use /ignore:emptyoutput to suppress it. The warning also points out the existing flag /llvmlibempty which forces creation of an empty .lib file (this is an extension to lib.exe). Differential Revision: https://reviews.llvm.org/D123517
47 lines
1.7 KiB
TableGen
47 lines
1.7 KiB
TableGen
include "llvm/Option/OptParser.td"
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// lib.exe accepts options starting with either a dash or a slash.
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// Flag that takes no arguments.
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class F<string name> : Flag<["/", "-", "/?", "-?"], name>;
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// Flag that takes one argument after ":".
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class P<string name, string help> :
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Joined<["/", "-", "/?", "-?"], name#":">, HelpText<help>;
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// Boolean flag which can be suffixed by ":no". Using it unsuffixed turns the
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// flag on and using it suffixed by ":no" turns it off.
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multiclass B<string name, string help_on, string help_off> {
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def "" : F<name>, HelpText<help_on>;
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def _no : F<name#":no">, HelpText<help_off>;
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}
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def ignore : P<"ignore", "Specify warning codes to ignore">;
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def libpath: P<"libpath", "Object file search path">;
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// Can't be called "list" since that's a keyword.
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def lst : F<"list">, HelpText<"List contents of .lib file on stdout">;
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def out : P<"out", "Path to file to write output">;
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def llvmlibthin : F<"llvmlibthin">,
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HelpText<"Make .lib point to .obj files instead of copying their contents">;
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def llvmlibempty : F<"llvmlibempty">,
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HelpText<"When given no contents, produce an empty .lib file">;
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def machine: P<"machine", "Specify target platform">;
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defm WX : B<"WX", "Treat warnings as errors",
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"Don't treat warnings as errors (default)">;
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def help : F<"help">;
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// /?? and -?? must be before /? and -? to not confuse lib/Options.
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def help_q : Flag<["/??", "-??", "/?", "-?"], "">, Alias<help>;
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//==============================================================================
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// The flags below do nothing. They are defined only for lib.exe compatibility.
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//==============================================================================
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def nologo : F<"nologo">;
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