r250577 - [modules] Allow the error when explicitly loading an incompatible module file
Richard Smith via cfe-commits
cfe-commits at lists.llvm.org
Fri Oct 16 18:12:54 PDT 2015
On Fri, Oct 16, 2015 at 4:43 PM, Sean Silva <chisophugis at gmail.com> wrote:
> On Fri, Oct 16, 2015 at 4:20 PM, Richard Smith via cfe-commits <
> cfe-commits at lists.llvm.org> wrote:
>
>> Author: rsmith
>> Date: Fri Oct 16 18:20:19 2015
>> New Revision: 250577
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=250577&view=rev
>> Log:
>> [modules] Allow the error when explicitly loading an incompatible module
>> file
>> via -fmodule-file= to be turned off; in that case, just include the
>> relevant
>> files textually. This allows module files to be unconditionally passed to
>> all
>> compile actions via CXXFLAGS, and to be ignored for rules that specify
>> custom
>> incompatible flags.
>>
>
> What direction are you trying to go with this? Are you thinking something
> like having CMake build a bunch of modules up front?
>
That's certainly one thing you can do with this. Another is that you can
make cmake automatically and explicitly build a module for each library,
and then provide that for all the dependencies of that library, with an
(error-by-default) warning in the case where the downstream library
specifies incompatible compilation flags. You can use this warning flag to
turn off the error so you can make progress before you get around to fixing
all the incompatible flags.
> If that's the case, it would be nice to explain what caused the mismatch,
> so that the user can look into rectifying it. Otherwise this warning is not
> directly actionable. The existing diagnostics seemed alright. Demoting them
> to "error: {{.*}} configuration mismatch" seems like a regression.
>
I agree, it is a regression, and fixing it is high on my list of priorities
(sorry for not mentioning that in the commit message).
-- Sean Silva
>
>
>>
>> Modified:
>> cfe/trunk/include/clang/Basic/DiagnosticFrontendKinds.td
>> cfe/trunk/lib/Frontend/CompilerInstance.cpp
>> cfe/trunk/test/Modules/merge-target-features.cpp
>>
>> Modified: cfe/trunk/include/clang/Basic/DiagnosticFrontendKinds.td
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticFrontendKinds.td?rev=250577&r1=250576&r2=250577&view=diff
>>
>> ==============================================================================
>> --- cfe/trunk/include/clang/Basic/DiagnosticFrontendKinds.td (original)
>> +++ cfe/trunk/include/clang/Basic/DiagnosticFrontendKinds.td Fri Oct 16
>> 18:20:19 2015
>> @@ -172,6 +172,9 @@ def warn_incompatible_analyzer_plugin_ap
>> def note_incompatible_analyzer_plugin_api : Note<
>> "current API version is '%0', but plugin was compiled with version
>> '%1'">;
>>
>> +def warn_module_config_mismatch : Warning<
>> + "module file %0 cannot be loaded due to a configuration mismatch with
>> the current "
>> + "compilation">, InGroup<DiagGroup<"module-file-config-mismatch">>,
>> DefaultError;
>> def err_module_map_not_found : Error<"module map file '%0' not found">,
>> DefaultFatal;
>> def err_missing_module_name : Error<
>>
>> Modified: cfe/trunk/lib/Frontend/CompilerInstance.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Frontend/CompilerInstance.cpp?rev=250577&r1=250576&r2=250577&view=diff
>>
>> ==============================================================================
>> --- cfe/trunk/lib/Frontend/CompilerInstance.cpp (original)
>> +++ cfe/trunk/lib/Frontend/CompilerInstance.cpp Fri Oct 16 18:20:19 2015
>> @@ -1335,15 +1335,24 @@ bool CompilerInstance::loadModuleFile(St
>> std::move(Listener));
>>
>> // Try to load the module file.
>> - if (ModuleManager->ReadAST(FileName, serialization::MK_ExplicitModule,
>> - SourceLocation(), ASTReader::ARR_None)
>> - != ASTReader::Success)
>> - return false;
>> -
>> + switch (ModuleManager->ReadAST(FileName,
>> serialization::MK_ExplicitModule,
>> + SourceLocation(),
>> + ASTReader::ARR_ConfigurationMismatch)) {
>> + case ASTReader::Success:
>> // We successfully loaded the module file; remember the set of provided
>> // modules so that we don't try to load implicit modules for them.
>> ListenerRef.registerAll();
>> return true;
>> +
>> + case ASTReader::ConfigurationMismatch:
>> + // Ignore unusable module files.
>> + getDiagnostics().Report(SourceLocation(),
>> diag::warn_module_config_mismatch)
>> + << FileName;
>> + return true;
>> +
>> + default:
>> + return false;
>> + }
>> }
>>
>> ModuleLoadResult
>>
>> Modified: cfe/trunk/test/Modules/merge-target-features.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Modules/merge-target-features.cpp?rev=250577&r1=250576&r2=250577&view=diff
>>
>> ==============================================================================
>> --- cfe/trunk/test/Modules/merge-target-features.cpp (original)
>> +++ cfe/trunk/test/Modules/merge-target-features.cpp Fri Oct 16 18:20:19
>> 2015
>> @@ -20,7 +20,7 @@
>> // RUN: -target-cpu i386 \
>> // RUN: -fsyntax-only merge-target-features.cpp 2>&1 \
>> // RUN: | FileCheck --check-prefix=SUBSET %s
>> -// SUBSET: AST file was compiled with the target feature'+sse2' but the
>> current translation unit is not
>> +// SUBSET: error: {{.*}} configuration mismatch
>> //
>> // RUN: %clang_cc1 -fmodules -x c++ -fmodules-cache-path=%t \
>> // RUN: -iquote Inputs/merge-target-features \
>> @@ -56,8 +56,7 @@
>> // RUN: -target-cpu i386 -target-feature +cx16 \
>> // RUN: -fsyntax-only merge-target-features.cpp 2>&1 \
>> // RUN: | FileCheck --check-prefix=MISMATCH %s
>> -// MISMATCH: AST file was compiled with the target feature'+sse2' but
>> the current translation unit is not
>> -// MISMATCH: current translation unit was compiled with the target
>> feature'+cx16' but the AST file was not
>> +// MISMATCH: error: {{.*}} configuration mismatch
>>
>> #include "foo.h"
>>
>>
>>
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>>
>
>
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