CMake/Source/cmTargetLinkLibrariesComman...

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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmTargetLinkLibrariesCommand.h"
#include "cmGeneratorExpression.h"
const char* cmTargetLinkLibrariesCommand::LinkLibraryTypeNames[3] = {
"general", "debug", "optimized"
};
// cmTargetLinkLibrariesCommand
bool cmTargetLinkLibrariesCommand::InitialPass(
std::vector<std::string> const& args, cmExecutionStatus&)
{
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// must have one argument
if (args.empty()) {
this->SetError("called with incorrect number of arguments");
return false;
}
if (this->Makefile->IsAlias(args[0])) {
this->SetError("can not be used on an ALIAS target.");
return false;
}
// Lookup the target for which libraries are specified.
this->Target =
this->Makefile->GetCMakeInstance()->GetGlobalGenerator()->FindTarget(
args[0]);
if (!this->Target) {
cmake::MessageType t = cmake::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 (this->Makefile->GetPolicyStatus(cmPolicies::CMP0016)) {
case cmPolicies::WARN:
t = cmake::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 = cmake::MESSAGE;
break;
case cmPolicies::REQUIRED_IF_USED:
case cmPolicies::REQUIRED_ALWAYS:
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e << "\n" << cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0016);
break;
case cmPolicies::NEW: // NEW behavior prints the error.
break;
}
}
// now actually print the message
switch (t) {
case cmake::AUTHOR_WARNING:
this->Makefile->IssueMessage(cmake::AUTHOR_WARNING, e.str());
break;
case cmake::FATAL_ERROR:
this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
cmSystemTools::SetFatalErrorOccured();
break;
default:
break;
}
return true;
}
if (this->Target->GetType() == cmState::OBJECT_LIBRARY) {
std::ostringstream e;
e << "Object library target \"" << args[0] << "\" "
<< "may not link to anything.";
this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
cmSystemTools::SetFatalErrorOccured();
return true;
}
if (this->Target->GetType() == cmState::UTILITY) {
std::ostringstream e;
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const char* modal = CM_NULLPTR;
cmake::MessageType messageType = cmake::AUTHOR_WARNING;
switch (this->Makefile->GetPolicyStatus(cmPolicies::CMP0039)) {
case cmPolicies::WARN:
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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 = cmake::FATAL_ERROR;
}
if (modal) {
e << "Utility target \"" << this->Target->GetName() << "\" " << modal
<< " not be used as the target of a target_link_libraries call.";
this->Makefile->IssueMessage(messageType, e.str());
if (messageType == cmake::FATAL_ERROR) {
return false;
}
}
}
// but we might not have any libs after variable expansion
if (args.size() < 2) {
return true;
}
// 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.
this->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") {
this->CurrentProcessingState = ProcessingPlainLinkInterface;
if (i != 1) {
this->Makefile->IssueMessage(
cmake::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 &&
this->CurrentProcessingState != ProcessingKeywordPrivateInterface &&
this->CurrentProcessingState != ProcessingKeywordPublicInterface &&
this->CurrentProcessingState != ProcessingKeywordLinkInterface) {
this->Makefile->IssueMessage(
cmake::FATAL_ERROR, "The INTERFACE option must appear as the second "
"argument, just after the target name.");
return true;
}
this->CurrentProcessingState = ProcessingKeywordLinkInterface;
} else if (args[i] == "LINK_PUBLIC") {
if (i != 1 &&
this->CurrentProcessingState != ProcessingPlainPrivateInterface &&
this->CurrentProcessingState != ProcessingPlainPublicInterface) {
this->Makefile->IssueMessage(
cmake::FATAL_ERROR,
"The LINK_PUBLIC or LINK_PRIVATE option must appear as the second "
"argument, just after the target name.");
return true;
}
this->CurrentProcessingState = ProcessingPlainPublicInterface;
} else if (args[i] == "PUBLIC") {
if (i != 1 &&
this->CurrentProcessingState != ProcessingKeywordPrivateInterface &&
this->CurrentProcessingState != ProcessingKeywordPublicInterface &&
this->CurrentProcessingState != ProcessingKeywordLinkInterface) {
this->Makefile->IssueMessage(
cmake::FATAL_ERROR,
"The PUBLIC or PRIVATE option must appear as the second "
"argument, just after the target name.");
return true;
}
this->CurrentProcessingState = ProcessingKeywordPublicInterface;
} else if (args[i] == "LINK_PRIVATE") {
if (i != 1 &&
this->CurrentProcessingState != ProcessingPlainPublicInterface &&
this->CurrentProcessingState != ProcessingPlainPrivateInterface) {
this->Makefile->IssueMessage(
cmake::FATAL_ERROR,
"The LINK_PUBLIC or LINK_PRIVATE option must appear as the second "
"argument, just after the target name.");
return true;
}
this->CurrentProcessingState = ProcessingPlainPrivateInterface;
} else if (args[i] == "PRIVATE") {
if (i != 1 &&
this->CurrentProcessingState != ProcessingKeywordPrivateInterface &&
this->CurrentProcessingState != ProcessingKeywordPublicInterface &&
this->CurrentProcessingState != ProcessingKeywordLinkInterface) {
this->Makefile->IssueMessage(
cmake::FATAL_ERROR,
"The PUBLIC or PRIVATE option must appear as the second "
"argument, just after the target name.");
return true;
}
this->CurrentProcessingState = ProcessingKeywordPrivateInterface;
} else if (args[i] == "debug") {
if (haveLLT) {
this->LinkLibraryTypeSpecifierWarning(llt, DEBUG_LibraryType);
}
llt = DEBUG_LibraryType;
haveLLT = true;
} else if (args[i] == "optimized") {
if (haveLLT) {
this->LinkLibraryTypeSpecifierWarning(llt, OPTIMIZED_LibraryType);
}
llt = OPTIMIZED_LibraryType;
haveLLT = true;
} else if (args[i] == "general") {
if (haveLLT) {
this->LinkLibraryTypeSpecifierWarning(llt, GENERAL_LibraryType);
}
llt = GENERAL_LibraryType;
haveLLT = true;
} else if (haveLLT) {
// The link type was specified by the previous argument.
haveLLT = false;
if (!this->HandleLibrary(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 maybe the case where someone has
// specifed 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 = args[0];
linkType += "_LINK_TYPE";
const char* linkTypeString = this->Makefile->GetDefinition(linkType);
if (linkTypeString) {
if (strcmp(linkTypeString, "debug") == 0) {
llt = DEBUG_LibraryType;
}
if (strcmp(linkTypeString, "optimized") == 0) {
llt = OPTIMIZED_LibraryType;
}
}
if (!this->HandleLibrary(args[i], llt)) {
return false;
}
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}
}
// Make sure the last argument was not a library type specifier.
if (haveLLT) {
std::ostringstream e;
e << "The \"" << this->LinkLibraryTypeNames[llt]
<< "\" argument must be followed by a library.";
this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
cmSystemTools::SetFatalErrorOccured();
}
const cmPolicies::PolicyStatus policy22Status =
this->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) &&
this->CurrentProcessingState != ProcessingLinkLibraries &&
!this->Target->GetProperty("LINK_INTERFACE_LIBRARIES")) {
this->Target->SetProperty("LINK_INTERFACE_LIBRARIES", "");
}
return true;
}
void cmTargetLinkLibrariesCommand::LinkLibraryTypeSpecifierWarning(int left,
int right)
{
std::ostringstream w;
w << "Link library type specifier \"" << this->LinkLibraryTypeNames[left]
<< "\" is followed by specifier \"" << this->LinkLibraryTypeNames[right]
<< "\" instead of a library name. "
<< "The first specifier will be ignored.";
this->Makefile->IssueMessage(cmake::AUTHOR_WARNING, w.str());
}
bool cmTargetLinkLibrariesCommand::HandleLibrary(const std::string& lib,
cmTargetLinkLibraryType llt)
{
if (this->Target->GetType() == cmState::INTERFACE_LIBRARY &&
this->CurrentProcessingState != ProcessingKeywordLinkInterface) {
this->Makefile->IssueMessage(
cmake::FATAL_ERROR,
"INTERFACE library can only be used with the INTERFACE keyword of "
"target_link_libraries");
return false;
}
cmTarget::TLLSignature sig =
(this->CurrentProcessingState == ProcessingPlainPrivateInterface ||
this->CurrentProcessingState == ProcessingPlainPublicInterface ||
this->CurrentProcessingState == ProcessingKeywordPrivateInterface ||
this->CurrentProcessingState == ProcessingKeywordPublicInterface ||
this->CurrentProcessingState == ProcessingKeywordLinkInterface)
? cmTarget::KeywordTLLSignature
: cmTarget::PlainTLLSignature;
if (!this->Target->PushTLLCommandTrace(
sig, this->Makefile->GetExecutionContext())) {
std::ostringstream e;
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const char* modal = CM_NULLPTR;
cmake::MessageType messageType = cmake::AUTHOR_WARNING;
switch (this->Makefile->GetPolicyStatus(cmPolicies::CMP0023)) {
case cmPolicies::WARN:
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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 = cmake::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 == cmake::FATAL_ERROR) {
return false;
}
}
}
// Handle normal case first.
if (this->CurrentProcessingState != ProcessingKeywordLinkInterface &&
this->CurrentProcessingState != ProcessingPlainLinkInterface) {
this->Makefile->AddLinkLibraryForTarget(this->Target->GetName(), lib, llt);
if (this->CurrentProcessingState == ProcessingLinkLibraries) {
this->Target->AppendProperty(
"INTERFACE_LINK_LIBRARIES",
this->Target->GetDebugGeneratorExpressions(lib, llt).c_str());
return true;
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}
if (this->CurrentProcessingState != ProcessingKeywordPublicInterface &&
this->CurrentProcessingState != ProcessingPlainPublicInterface) {
if (this->Target->GetType() == cmState::STATIC_LIBRARY) {
std::string configLib =
this->Target->GetDebugGeneratorExpressions(lib, llt);
if (cmGeneratorExpression::IsValidTargetName(lib) ||
cmGeneratorExpression::Find(lib) != std::string::npos) {
configLib = "$<LINK_ONLY:" + configLib + ">";
}
this->Target->AppendProperty("INTERFACE_LINK_LIBRARIES",
configLib.c_str());
}
// Not a 'public' or 'interface' library. Do not add to interface
// property.
return true;
}
}
this->Target->AppendProperty(
"INTERFACE_LINK_LIBRARIES",
this->Target->GetDebugGeneratorExpressions(lib, llt).c_str());
const cmPolicies::PolicyStatus policy22Status =
this->Target->GetPolicyStatusCMP0022();
if (policy22Status != cmPolicies::OLD &&
policy22Status != cmPolicies::WARN) {
return true;
}
if (this->Target->GetType() == cmState::INTERFACE_LIBRARY) {
return true;
}
// 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::vector<std::string>::const_iterator i = debugConfigs.begin();
i != debugConfigs.end(); ++i) {
prop = "LINK_INTERFACE_LIBRARIES_";
prop += *i;
this->Target->AppendProperty(prop, lib.c_str());
}
}
if (llt == OPTIMIZED_LibraryType || llt == GENERAL_LibraryType) {
// Put in the non-DEBUG configuration interfaces.
this->Target->AppendProperty("LINK_INTERFACE_LIBRARIES", lib.c_str());
// Make sure the DEBUG configuration interfaces exist so that the
// general one will not be used as a fall-back.
for (std::vector<std::string>::const_iterator i = debugConfigs.begin();
i != debugConfigs.end(); ++i) {
prop = "LINK_INTERFACE_LIBRARIES_";
prop += *i;
if (!this->Target->GetProperty(prop)) {
this->Target->SetProperty(prop, "");
}
}
}
return true;
}