r274991 - [clang-cl] Add support for /Zd
David Majnemer via cfe-commits
cfe-commits at lists.llvm.org
Mon Jul 11 08:36:32 PDT 2016
On Mon, Jul 11, 2016 at 7:18 AM, Nico Weber <thakis at chromium.org> wrote:
> VS2013's cl.exe doesn't understand /Zd, 2015's doesn't either. This means
> people who want to ask clang-cl for line tables only will have to add this
> flag in some if(is_clang) block in their build file anyways. What's the
> advantage of giving this flag a spelling that's different from both cl and
> clang? With -gline-tables-only, an if(is_clang) works on Linux, Mac,
> Windows.
>
> (Even if there's a good case for /Zd, I don't think we should remove
> user-exposed flags without a strong reason, so even if we keep /Zd I think
> we should also keep exposing -gline-tables-only.)
>
Existing users of -gline-tables-only? I'd imagine any responsible users of
-gline-tables-only would probably use their build system to verify that the
flag exists. We have never released an official LLVM which supported it
(LLVM 3.8 came out in early March and -gline-tables-only was exposed via
clang-cl in mid March).
I'd consider it in poor form for users to take a hard dependency on a flag
which only exists in a compiler which has never been released.
I'd agree with you if -gline-tables-only had made its way to an actual
release.
>
> On Mon, Jul 11, 2016 at 10:08 AM, Nico Weber <thakis at chromium.org> wrote:
>
>> This breaks existing users of -gline-tables-only. What's the motivation
>> for this change?
>>
>
>> On Sat, Jul 9, 2016 at 5:49 PM, David Majnemer via cfe-commits <
>> cfe-commits at lists.llvm.org> wrote:
>>
>>> Author: majnemer
>>> Date: Sat Jul 9 16:49:16 2016
>>> New Revision: 274991
>>>
>>> URL: http://llvm.org/viewvc/llvm-project?rev=274991&view=rev
>>> Log:
>>> [clang-cl] Add support for /Zd
>>>
>>> MASM (ML.exe and ML64.exe) and older versions of MSVC (CL.exe) support a
>>> flag called /Zd which is more-or-less -gline-tables-only.
>>>
>>> It seems nicer to support this flag instead of exposing
>>> -gline-tables-only.
>>>
>>> Modified:
>>> cfe/trunk/include/clang/Driver/CLCompatOptions.td
>>> cfe/trunk/include/clang/Driver/Options.td
>>> cfe/trunk/lib/Driver/Tools.cpp
>>> cfe/trunk/test/Driver/cl-options.c
>>>
>>> Modified: cfe/trunk/include/clang/Driver/CLCompatOptions.td
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Driver/CLCompatOptions.td?rev=274991&r1=274990&r2=274991&view=diff
>>>
>>> ==============================================================================
>>> --- cfe/trunk/include/clang/Driver/CLCompatOptions.td (original)
>>> +++ cfe/trunk/include/clang/Driver/CLCompatOptions.td Sat Jul 9
>>> 16:49:16 2016
>>> @@ -166,6 +166,8 @@ def _SLASH_Zc_trigraphs_off : CLFlag<"Zc
>>> HelpText<"Disable trigraphs (default)">, Alias<fno_trigraphs>;
>>> def _SLASH_Z7 : CLFlag<"Z7">,
>>> HelpText<"Enable CodeView debug information in object files">;
>>> +def _SLASH_Zd : CLFlag<"Zd">,
>>> + HelpText<"Emit debug line number tables only">;
>>> def _SLASH_Zi : CLFlag<"Zi">, Alias<_SLASH_Z7>,
>>> HelpText<"Alias for /Z7. Does not produce PDBs.">;
>>> def _SLASH_Zp : CLJoined<"Zp">,
>>>
>>> Modified: cfe/trunk/include/clang/Driver/Options.td
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Driver/Options.td?rev=274991&r1=274990&r2=274991&view=diff
>>>
>>> ==============================================================================
>>> --- cfe/trunk/include/clang/Driver/Options.td (original)
>>> +++ cfe/trunk/include/clang/Driver/Options.td Sat Jul 9 16:49:16 2016
>>> @@ -1229,7 +1229,7 @@ def fdebug_prefix_map_EQ
>>> def g_Flag : Flag<["-"], "g">, Group<g_Group>,
>>> HelpText<"Generate source-level debug information">;
>>> def gline_tables_only : Flag<["-"], "gline-tables-only">,
>>> Group<gN_Group>,
>>> - Flags<[CoreOption]>, HelpText<"Emit debug line number tables only">;
>>> + HelpText<"Emit debug line number tables only">;
>>> def gmlt : Flag<["-"], "gmlt">, Alias<gline_tables_only>;
>>> def g0 : Flag<["-"], "g0">, Group<gN_Group>;
>>> def g1 : Flag<["-"], "g1">, Group<gN_Group>, Alias<gline_tables_only>;
>>>
>>> Modified: cfe/trunk/lib/Driver/Tools.cpp
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=274991&r1=274990&r2=274991&view=diff
>>>
>>> ==============================================================================
>>> --- cfe/trunk/lib/Driver/Tools.cpp (original)
>>> +++ cfe/trunk/lib/Driver/Tools.cpp Sat Jul 9 16:49:16 2016
>>> @@ -6269,12 +6269,18 @@ void Clang::AddClangCLArgs(const ArgList
>>>
>>> CmdArgs.push_back(Args.MakeArgString(Twine(LangOptions::SSPStrong)));
>>> }
>>>
>>> - // Emit CodeView if -Z7 is present.
>>> - *EmitCodeView = Args.hasArg(options::OPT__SLASH_Z7);
>>> - if (*EmitCodeView)
>>> - *DebugInfoKind = codegenoptions::LimitedDebugInfo;
>>> - if (*EmitCodeView)
>>> + // Emit CodeView if -Z7 or -Zd are present.
>>> + if (Arg *DebugInfoArg =
>>> + Args.getLastArg(options::OPT__SLASH_Z7,
>>> options::OPT__SLASH_Zd)) {
>>> + *EmitCodeView = true;
>>> + if (DebugInfoArg->getOption().matches(options::OPT__SLASH_Z7))
>>> + *DebugInfoKind = codegenoptions::LimitedDebugInfo;
>>> + else
>>> + *DebugInfoKind = codegenoptions::DebugLineTablesOnly;
>>> CmdArgs.push_back("-gcodeview");
>>> + } else {
>>> + *EmitCodeView = false;
>>> + }
>>>
>>> const Driver &D = getToolChain().getDriver();
>>> EHFlags EH = parseClangCLEHFlags(D, Args);
>>> @@ -9964,7 +9970,8 @@ void visualstudio::Linker::ConstructJob(
>>>
>>> CmdArgs.push_back("-nologo");
>>>
>>> - if (Args.hasArg(options::OPT_g_Group, options::OPT__SLASH_Z7))
>>> + if (Args.hasArg(options::OPT_g_Group, options::OPT__SLASH_Z7,
>>> + options::OPT__SLASH_Zd))
>>> CmdArgs.push_back("-debug");
>>>
>>> bool DLL = Args.hasArg(options::OPT__SLASH_LD,
>>> options::OPT__SLASH_LDd,
>>>
>>> Modified: cfe/trunk/test/Driver/cl-options.c
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/cl-options.c?rev=274991&r1=274990&r2=274991&view=diff
>>>
>>> ==============================================================================
>>> --- cfe/trunk/test/Driver/cl-options.c (original)
>>> +++ cfe/trunk/test/Driver/cl-options.c Sat Jul 9 16:49:16 2016
>>> @@ -420,7 +420,7 @@
>>> // Z7: "-gcodeview"
>>> // Z7: "-debug-info-kind=limited"
>>>
>>> -// RUN: %clang_cl -gline-tables-only /Z7 /c -### -- %s 2>&1 | FileCheck
>>> -check-prefix=Z7GMLT %s
>>> +// RUN: %clang_cl /Zd /c -### -- %s 2>&1 | FileCheck
>>> -check-prefix=Z7GMLT %s
>>> // Z7GMLT: "-gcodeview"
>>> // Z7GMLT: "-debug-info-kind=line-tables-only"
>>>
>>>
>>>
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>>>
>>
>>
>
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