| /* Distributed under the OSI-approved BSD 3-Clause License. See accompanying |
| file Copyright.txt or https://cmake.org/licensing for details. */ |
| #include "cmTargetLinkLibrariesCommand.h" |
| |
| #include <cstring> |
| #include <memory> |
| #include <sstream> |
| #include <unordered_set> |
| #include <utility> |
| |
| #include "cmExecutionStatus.h" |
| #include "cmGeneratorExpression.h" |
| #include "cmGlobalGenerator.h" |
| #include "cmMakefile.h" |
| #include "cmMessageType.h" |
| #include "cmPolicies.h" |
| #include "cmState.h" |
| #include "cmStateTypes.h" |
| #include "cmStringAlgorithms.h" |
| #include "cmSystemTools.h" |
| #include "cmTarget.h" |
| #include "cmTargetLinkLibraryType.h" |
| #include "cmake.h" |
| |
| namespace { |
| |
| enum ProcessingState |
| { |
| ProcessingLinkLibraries, |
| ProcessingPlainLinkInterface, |
| ProcessingKeywordLinkInterface, |
| ProcessingPlainPublicInterface, |
| ProcessingKeywordPublicInterface, |
| ProcessingPlainPrivateInterface, |
| ProcessingKeywordPrivateInterface |
| }; |
| |
| const char* LinkLibraryTypeNames[3] = { "general", "debug", "optimized" }; |
| |
| struct TLL |
| { |
| cmMakefile& Makefile; |
| cmTarget* Target; |
| bool WarnRemoteInterface = false; |
| bool RejectRemoteLinking = false; |
| bool EncodeRemoteReference = false; |
| std::string DirectoryId; |
| std::unordered_set<std::string> Props; |
| |
| TLL(cmMakefile& mf, cmTarget* target); |
| ~TLL(); |
| |
| bool HandleLibrary(ProcessingState currentProcessingState, |
| const std::string& lib, cmTargetLinkLibraryType llt); |
| void AppendProperty(std::string const& prop, std::string const& value); |
| void AffectsProperty(std::string const& prop); |
| }; |
| |
| } // namespace |
| |
| static void LinkLibraryTypeSpecifierWarning(cmMakefile& mf, int left, |
| int right); |
| |
| bool cmTargetLinkLibrariesCommand(std::vector<std::string> const& args, |
| cmExecutionStatus& status) |
| { |
| // Must have at least one argument. |
| if (args.empty()) { |
| status.SetError("called with incorrect number of arguments"); |
| return false; |
| } |
| |
| cmMakefile& mf = status.GetMakefile(); |
| |
| // Alias targets cannot be on the LHS of this command. |
| if (mf.IsAlias(args[0])) { |
| status.SetError("can not be used on an ALIAS target."); |
| return false; |
| } |
| |
| // Lookup the target for which libraries are specified. |
| cmTarget* target = |
| mf.GetCMakeInstance()->GetGlobalGenerator()->FindTarget(args[0]); |
| if (!target) { |
| for (const auto& importedTarget : mf.GetOwnedImportedTargets()) { |
| if (importedTarget->GetName() == args[0]) { |
| target = importedTarget.get(); |
| break; |
| } |
| } |
| } |
| if (!target) { |
| MessageType t = MessageType::FATAL_ERROR; // fail by default |
| std::ostringstream e; |
| e << "Cannot specify link libraries for target \"" << args[0] << "\" " |
| << "which is not built by this project."; |
| // The bad target is the only argument. Check how policy CMP0016 is set, |
| // and accept, warn or fail respectively: |
| if (args.size() < 2) { |
| switch (mf.GetPolicyStatus(cmPolicies::CMP0016)) { |
| case cmPolicies::WARN: |
| t = MessageType::AUTHOR_WARNING; |
| // Print the warning. |
| e << "\n" |
| << "CMake does not support this but it used to work accidentally " |
| << "and is being allowed for compatibility." |
| << "\n" |
| << cmPolicies::GetPolicyWarning(cmPolicies::CMP0016); |
| break; |
| case cmPolicies::OLD: // OLD behavior does not warn. |
| t = MessageType::MESSAGE; |
| break; |
| case cmPolicies::REQUIRED_IF_USED: |
| case cmPolicies::REQUIRED_ALWAYS: |
| e << "\n" << cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0016); |
| break; |
| case cmPolicies::NEW: // NEW behavior prints the error. |
| break; |
| } |
| } |
| // Now actually print the message. |
| switch (t) { |
| case MessageType::AUTHOR_WARNING: |
| mf.IssueMessage(MessageType::AUTHOR_WARNING, e.str()); |
| break; |
| case MessageType::FATAL_ERROR: |
| mf.IssueMessage(MessageType::FATAL_ERROR, e.str()); |
| cmSystemTools::SetFatalErrorOccured(); |
| break; |
| default: |
| break; |
| } |
| return true; |
| } |
| |
| // Having a UTILITY library on the LHS is a bug. |
| if (target->GetType() == cmStateEnums::UTILITY) { |
| std::ostringstream e; |
| const char* modal = nullptr; |
| MessageType messageType = MessageType::AUTHOR_WARNING; |
| switch (mf.GetPolicyStatus(cmPolicies::CMP0039)) { |
| case cmPolicies::WARN: |
| e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0039) << "\n"; |
| modal = "should"; |
| case cmPolicies::OLD: |
| break; |
| case cmPolicies::REQUIRED_ALWAYS: |
| case cmPolicies::REQUIRED_IF_USED: |
| case cmPolicies::NEW: |
| modal = "must"; |
| messageType = MessageType::FATAL_ERROR; |
| } |
| if (modal) { |
| e << "Utility target \"" << target->GetName() << "\" " << modal |
| << " not be used as the target of a target_link_libraries call."; |
| mf.IssueMessage(messageType, e.str()); |
| if (messageType == MessageType::FATAL_ERROR) { |
| return false; |
| } |
| } |
| } |
| |
| // But we might not have any libs after variable expansion. |
| if (args.size() < 2) { |
| return true; |
| } |
| |
| TLL tll(mf, target); |
| |
| // Keep track of link configuration specifiers. |
| cmTargetLinkLibraryType llt = GENERAL_LibraryType; |
| bool haveLLT = false; |
| |
| // Start with primary linking and switch to link interface |
| // specification if the keyword is encountered as the first argument. |
| ProcessingState currentProcessingState = ProcessingLinkLibraries; |
| |
| // Add libraries, note that there is an optional prefix |
| // of debug and optimized that can be used. |
| for (unsigned int i = 1; i < args.size(); ++i) { |
| if (args[i] == "LINK_INTERFACE_LIBRARIES") { |
| currentProcessingState = ProcessingPlainLinkInterface; |
| if (i != 1) { |
| mf.IssueMessage( |
| MessageType::FATAL_ERROR, |
| "The LINK_INTERFACE_LIBRARIES option must appear as the second " |
| "argument, just after the target name."); |
| return true; |
| } |
| } else if (args[i] == "INTERFACE") { |
| if (i != 1 && |
| currentProcessingState != ProcessingKeywordPrivateInterface && |
| currentProcessingState != ProcessingKeywordPublicInterface && |
| currentProcessingState != ProcessingKeywordLinkInterface) { |
| mf.IssueMessage( |
| MessageType::FATAL_ERROR, |
| "The INTERFACE, PUBLIC or PRIVATE option must appear as the second " |
| "argument, just after the target name."); |
| return true; |
| } |
| currentProcessingState = ProcessingKeywordLinkInterface; |
| } else if (args[i] == "LINK_PUBLIC") { |
| if (i != 1 && |
| currentProcessingState != ProcessingPlainPrivateInterface && |
| currentProcessingState != ProcessingPlainPublicInterface) { |
| mf.IssueMessage( |
| MessageType::FATAL_ERROR, |
| "The LINK_PUBLIC or LINK_PRIVATE option must appear as the second " |
| "argument, just after the target name."); |
| return true; |
| } |
| currentProcessingState = ProcessingPlainPublicInterface; |
| } else if (args[i] == "PUBLIC") { |
| if (i != 1 && |
| currentProcessingState != ProcessingKeywordPrivateInterface && |
| currentProcessingState != ProcessingKeywordPublicInterface && |
| currentProcessingState != ProcessingKeywordLinkInterface) { |
| mf.IssueMessage( |
| MessageType::FATAL_ERROR, |
| "The INTERFACE, PUBLIC or PRIVATE option must appear as the second " |
| "argument, just after the target name."); |
| return true; |
| } |
| currentProcessingState = ProcessingKeywordPublicInterface; |
| } else if (args[i] == "LINK_PRIVATE") { |
| if (i != 1 && currentProcessingState != ProcessingPlainPublicInterface && |
| currentProcessingState != ProcessingPlainPrivateInterface) { |
| mf.IssueMessage( |
| MessageType::FATAL_ERROR, |
| "The LINK_PUBLIC or LINK_PRIVATE option must appear as the second " |
| "argument, just after the target name."); |
| return true; |
| } |
| currentProcessingState = ProcessingPlainPrivateInterface; |
| } else if (args[i] == "PRIVATE") { |
| if (i != 1 && |
| currentProcessingState != ProcessingKeywordPrivateInterface && |
| currentProcessingState != ProcessingKeywordPublicInterface && |
| currentProcessingState != ProcessingKeywordLinkInterface) { |
| mf.IssueMessage( |
| MessageType::FATAL_ERROR, |
| "The INTERFACE, PUBLIC or PRIVATE option must appear as the second " |
| "argument, just after the target name."); |
| return true; |
| } |
| currentProcessingState = ProcessingKeywordPrivateInterface; |
| } else if (args[i] == "debug") { |
| if (haveLLT) { |
| LinkLibraryTypeSpecifierWarning(mf, llt, DEBUG_LibraryType); |
| } |
| llt = DEBUG_LibraryType; |
| haveLLT = true; |
| } else if (args[i] == "optimized") { |
| if (haveLLT) { |
| LinkLibraryTypeSpecifierWarning(mf, llt, OPTIMIZED_LibraryType); |
| } |
| llt = OPTIMIZED_LibraryType; |
| haveLLT = true; |
| } else if (args[i] == "general") { |
| if (haveLLT) { |
| LinkLibraryTypeSpecifierWarning(mf, llt, GENERAL_LibraryType); |
| } |
| llt = GENERAL_LibraryType; |
| haveLLT = true; |
| } else if (haveLLT) { |
| // The link type was specified by the previous argument. |
| haveLLT = false; |
| if (!tll.HandleLibrary(currentProcessingState, args[i], llt)) { |
| return false; |
| } |
| } else { |
| // Lookup old-style cache entry if type is unspecified. So if you |
| // do a target_link_libraries(foo optimized bar) it will stay optimized |
| // and not use the lookup. As there may be the case where someone has |
| // specified that a library is both debug and optimized. (this check is |
| // only there for backwards compatibility when mixing projects built |
| // with old versions of CMake and new) |
| llt = GENERAL_LibraryType; |
| std::string linkType = cmStrCat(args[0], "_LINK_TYPE"); |
| const char* linkTypeString = mf.GetDefinition(linkType); |
| if (linkTypeString) { |
| if (strcmp(linkTypeString, "debug") == 0) { |
| llt = DEBUG_LibraryType; |
| } |
| if (strcmp(linkTypeString, "optimized") == 0) { |
| llt = OPTIMIZED_LibraryType; |
| } |
| } |
| if (!tll.HandleLibrary(currentProcessingState, args[i], llt)) { |
| return false; |
| } |
| } |
| } |
| |
| // Make sure the last argument was not a library type specifier. |
| if (haveLLT) { |
| mf.IssueMessage(MessageType::FATAL_ERROR, |
| cmStrCat("The \"", LinkLibraryTypeNames[llt], |
| "\" argument must be followed by a library.")); |
| cmSystemTools::SetFatalErrorOccured(); |
| } |
| |
| const cmPolicies::PolicyStatus policy22Status = |
| target->GetPolicyStatusCMP0022(); |
| |
| // If any of the LINK_ options were given, make sure the |
| // LINK_INTERFACE_LIBRARIES target property exists. |
| // Use of any of the new keywords implies awareness of |
| // this property. And if no libraries are named, it should |
| // result in an empty link interface. |
| if ((policy22Status == cmPolicies::OLD || |
| policy22Status == cmPolicies::WARN) && |
| currentProcessingState != ProcessingLinkLibraries && |
| !target->GetProperty("LINK_INTERFACE_LIBRARIES")) { |
| target->SetProperty("LINK_INTERFACE_LIBRARIES", ""); |
| } |
| |
| return true; |
| } |
| |
| static void LinkLibraryTypeSpecifierWarning(cmMakefile& mf, int left, |
| int right) |
| { |
| mf.IssueMessage( |
| MessageType::AUTHOR_WARNING, |
| cmStrCat( |
| "Link library type specifier \"", LinkLibraryTypeNames[left], |
| "\" is followed by specifier \"", LinkLibraryTypeNames[right], |
| "\" instead of a library name. The first specifier will be ignored.")); |
| } |
| |
| namespace { |
| |
| TLL::TLL(cmMakefile& mf, cmTarget* target) |
| : Makefile(mf) |
| , Target(target) |
| { |
| if (&this->Makefile != this->Target->GetMakefile()) { |
| // The LHS target was created in another directory. |
| switch (this->Makefile.GetPolicyStatus(cmPolicies::CMP0079)) { |
| case cmPolicies::WARN: |
| this->WarnRemoteInterface = true; |
| CM_FALLTHROUGH; |
| case cmPolicies::OLD: |
| this->RejectRemoteLinking = true; |
| break; |
| case cmPolicies::REQUIRED_ALWAYS: |
| case cmPolicies::REQUIRED_IF_USED: |
| case cmPolicies::NEW: |
| this->EncodeRemoteReference = true; |
| break; |
| } |
| } |
| if (this->EncodeRemoteReference) { |
| cmDirectoryId const dirId = this->Makefile.GetDirectoryId(); |
| this->DirectoryId = cmStrCat(CMAKE_DIRECTORY_ID_SEP, dirId.String); |
| } |
| } |
| |
| bool TLL::HandleLibrary(ProcessingState currentProcessingState, |
| const std::string& lib, cmTargetLinkLibraryType llt) |
| { |
| if (this->Target->GetType() == cmStateEnums::INTERFACE_LIBRARY && |
| currentProcessingState != ProcessingKeywordLinkInterface) { |
| this->Makefile.IssueMessage( |
| MessageType::FATAL_ERROR, |
| "INTERFACE library can only be used with the INTERFACE keyword of " |
| "target_link_libraries"); |
| return false; |
| } |
| if (this->Target->IsImported() && |
| currentProcessingState != ProcessingKeywordLinkInterface) { |
| this->Makefile.IssueMessage( |
| MessageType::FATAL_ERROR, |
| "IMPORTED library can only be used with the INTERFACE keyword of " |
| "target_link_libraries"); |
| return false; |
| } |
| |
| cmTarget::TLLSignature sig = |
| (currentProcessingState == ProcessingPlainPrivateInterface || |
| currentProcessingState == ProcessingPlainPublicInterface || |
| currentProcessingState == ProcessingKeywordPrivateInterface || |
| currentProcessingState == ProcessingKeywordPublicInterface || |
| currentProcessingState == ProcessingKeywordLinkInterface) |
| ? cmTarget::KeywordTLLSignature |
| : cmTarget::PlainTLLSignature; |
| if (!this->Target->PushTLLCommandTrace( |
| sig, this->Makefile.GetExecutionContext())) { |
| std::ostringstream e; |
| const char* modal = nullptr; |
| MessageType messageType = MessageType::AUTHOR_WARNING; |
| switch (this->Makefile.GetPolicyStatus(cmPolicies::CMP0023)) { |
| case cmPolicies::WARN: |
| e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0023) << "\n"; |
| modal = "should"; |
| case cmPolicies::OLD: |
| break; |
| case cmPolicies::REQUIRED_ALWAYS: |
| case cmPolicies::REQUIRED_IF_USED: |
| case cmPolicies::NEW: |
| modal = "must"; |
| messageType = MessageType::FATAL_ERROR; |
| } |
| |
| if (modal) { |
| // If the sig is a keyword form and there is a conflict, the existing |
| // form must be the plain form. |
| const char* existingSig = |
| (sig == cmTarget::KeywordTLLSignature ? "plain" : "keyword"); |
| e << "The " << existingSig |
| << " signature for target_link_libraries has " |
| "already been used with the target \"" |
| << this->Target->GetName() |
| << "\". All uses of target_link_libraries with a target " << modal |
| << " be either all-keyword or all-plain.\n"; |
| this->Target->GetTllSignatureTraces(e, |
| sig == cmTarget::KeywordTLLSignature |
| ? cmTarget::PlainTLLSignature |
| : cmTarget::KeywordTLLSignature); |
| this->Makefile.IssueMessage(messageType, e.str()); |
| if (messageType == MessageType::FATAL_ERROR) { |
| return false; |
| } |
| } |
| } |
| |
| // Handle normal case where the command was called with another keyword than |
| // INTERFACE / LINK_INTERFACE_LIBRARIES or none at all. (The "LINK_LIBRARIES" |
| // property of the target on the LHS shall be populated.) |
| if (currentProcessingState != ProcessingKeywordLinkInterface && |
| currentProcessingState != ProcessingPlainLinkInterface) { |
| |
| if (this->RejectRemoteLinking) { |
| this->Makefile.IssueMessage( |
| MessageType::FATAL_ERROR, |
| cmStrCat("Attempt to add link library \"", lib, "\" to target \"", |
| this->Target->GetName(), |
| "\" which is not built in this " |
| "directory.\nThis is allowed only when policy CMP0079 " |
| "is set to NEW.")); |
| return false; |
| } |
| |
| cmTarget* tgt = this->Makefile.GetGlobalGenerator()->FindTarget(lib); |
| |
| if (tgt && (tgt->GetType() != cmStateEnums::STATIC_LIBRARY) && |
| (tgt->GetType() != cmStateEnums::SHARED_LIBRARY) && |
| (tgt->GetType() != cmStateEnums::UNKNOWN_LIBRARY) && |
| (tgt->GetType() != cmStateEnums::OBJECT_LIBRARY) && |
| (tgt->GetType() != cmStateEnums::INTERFACE_LIBRARY) && |
| !tgt->IsExecutableWithExports()) { |
| this->Makefile.IssueMessage( |
| MessageType::FATAL_ERROR, |
| cmStrCat( |
| "Target \"", lib, "\" of type ", |
| cmState::GetTargetTypeName(tgt->GetType()), |
| " may not be linked into another target. One may link only to " |
| "INTERFACE, OBJECT, STATIC or SHARED libraries, or to ", |
| "executables with the ENABLE_EXPORTS property set.")); |
| } |
| |
| this->AffectsProperty("LINK_LIBRARIES"); |
| this->Target->AddLinkLibrary(this->Makefile, lib, llt); |
| } |
| |
| if (this->WarnRemoteInterface) { |
| this->Makefile.IssueMessage( |
| MessageType::AUTHOR_WARNING, |
| cmStrCat( |
| cmPolicies::GetPolicyWarning(cmPolicies::CMP0079), "\nTarget\n ", |
| this->Target->GetName(), |
| "\nis not created in this " |
| "directory. For compatibility with older versions of CMake, link " |
| "library\n ", |
| lib, |
| "\nwill be looked up in the directory in which " |
| "the target was created rather than in this calling directory.")); |
| } |
| |
| // Handle (additional) case where the command was called with PRIVATE / |
| // LINK_PRIVATE and stop its processing. (The "INTERFACE_LINK_LIBRARIES" |
| // property of the target on the LHS shall only be populated if it is a |
| // STATIC library.) |
| if (currentProcessingState == ProcessingKeywordPrivateInterface || |
| currentProcessingState == ProcessingPlainPrivateInterface) { |
| if (this->Target->GetType() == cmStateEnums::STATIC_LIBRARY || |
| this->Target->GetType() == cmStateEnums::OBJECT_LIBRARY) { |
| std::string configLib = |
| this->Target->GetDebugGeneratorExpressions(lib, llt); |
| if (cmGeneratorExpression::IsValidTargetName(lib) || |
| cmGeneratorExpression::Find(lib) != std::string::npos) { |
| configLib = "$<LINK_ONLY:" + configLib + ">"; |
| } |
| this->AppendProperty("INTERFACE_LINK_LIBRARIES", configLib); |
| } |
| return true; |
| } |
| |
| // Handle general case where the command was called with another keyword than |
| // PRIVATE / LINK_PRIVATE or none at all. (The "INTERFACE_LINK_LIBRARIES" |
| // property of the target on the LHS shall be populated.) |
| this->AppendProperty("INTERFACE_LINK_LIBRARIES", |
| this->Target->GetDebugGeneratorExpressions(lib, llt)); |
| |
| // Stop processing if called without any keyword. |
| if (currentProcessingState == ProcessingLinkLibraries) { |
| return true; |
| } |
| // Stop processing if policy CMP0022 is set to NEW. |
| const cmPolicies::PolicyStatus policy22Status = |
| this->Target->GetPolicyStatusCMP0022(); |
| if (policy22Status != cmPolicies::OLD && |
| policy22Status != cmPolicies::WARN) { |
| return true; |
| } |
| // Stop processing if called with an INTERFACE library on the LHS. |
| if (this->Target->GetType() == cmStateEnums::INTERFACE_LIBRARY) { |
| return true; |
| } |
| |
| // Handle (additional) backward-compatibility case where the command was |
| // called with PUBLIC / INTERFACE / LINK_PUBLIC / LINK_INTERFACE_LIBRARIES. |
| // (The policy CMP0022 is not set to NEW.) |
| { |
| // Get the list of configurations considered to be DEBUG. |
| std::vector<std::string> debugConfigs = |
| this->Makefile.GetCMakeInstance()->GetDebugConfigs(); |
| std::string prop; |
| |
| // Include this library in the link interface for the target. |
| if (llt == DEBUG_LibraryType || llt == GENERAL_LibraryType) { |
| // Put in the DEBUG configuration interfaces. |
| for (std::string const& dc : debugConfigs) { |
| prop = cmStrCat("LINK_INTERFACE_LIBRARIES_", dc); |
| this->AppendProperty(prop, lib); |
| } |
| } |
| if (llt == OPTIMIZED_LibraryType || llt == GENERAL_LibraryType) { |
| // Put in the non-DEBUG configuration interfaces. |
| this->AppendProperty("LINK_INTERFACE_LIBRARIES", lib); |
| |
| // Make sure the DEBUG configuration interfaces exist so that the |
| // general one will not be used as a fall-back. |
| for (std::string const& dc : debugConfigs) { |
| prop = cmStrCat("LINK_INTERFACE_LIBRARIES_", dc); |
| if (!this->Target->GetProperty(prop)) { |
| this->Target->SetProperty(prop, ""); |
| } |
| } |
| } |
| } |
| return true; |
| } |
| |
| void TLL::AppendProperty(std::string const& prop, std::string const& value) |
| { |
| this->AffectsProperty(prop); |
| this->Target->AppendProperty(prop, value); |
| } |
| |
| void TLL::AffectsProperty(std::string const& prop) |
| { |
| if (!this->EncodeRemoteReference) { |
| return; |
| } |
| // Add a wrapper to the expression to tell LookupLinkItems to look up |
| // names in the caller's directory. |
| if (this->Props.insert(prop).second) { |
| this->Target->AppendProperty(prop, this->DirectoryId); |
| } |
| } |
| |
| TLL::~TLL() |
| { |
| for (std::string const& prop : this->Props) { |
| this->Target->AppendProperty(prop, CMAKE_DIRECTORY_ID_SEP); |
| } |
| } |
| |
| } // namespace |
