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Add options to run ldd -u -r as a "link-what-you-use" tool

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Create a LINK_WHAT_YOU_USE target property and corresponding
CMAKE_LINK_WHAT_YOU_USE variable to enable this behavior.
Extend link commands by running `ldd -u -r` to detect shared
libraries that are linked but not needed.
This commit is contained in:
Bill Hoffman
2016-06-02 18:08:30 -04:00
committed by Brad King
parent ba92e11f8b
commit 96242f8022
22 changed files with 164 additions and 6 deletions
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13
Source/cmMakefileLibraryTargetGenerator.cxx
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@@ -163,6 +163,9 @@ void cmMakefileLibraryTargetGenerator::WriteSharedLibraryRules(bool relink)
extraFlags, "CMAKE_SHARED_LINKER_FLAGS", this->ConfigName);
this->AddModuleDefinitionFlag(extraFlags);
if (this->GeneratorTarget->GetProperty("LINK_WHAT_YOU_USE")) {
this->LocalGenerator->AppendFlags(extraFlags, " -Wl,--no-as-needed");
}
this->WriteLibraryRules(linkRuleVar, extraFlags, relink);
}
@@ -682,6 +685,15 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules(
// Get the set of commands.
std::string linkRule = this->GetLinkRule(linkRuleVar);
cmSystemTools::ExpandListArgument(linkRule, real_link_commands);
if (this->GeneratorTarget->GetProperty("LINK_WHAT_YOU_USE") &&
(this->GeneratorTarget->GetType() == cmState::SHARED_LIBRARY)) {
std::string cmakeCommand =
this->Convert(cmSystemTools::GetCMakeCommand(),
cmLocalGenerator::NONE, cmLocalGenerator::SHELL);
cmakeCommand += " -E __run_iwyu --lwyu=";
cmakeCommand += targetOutPathReal;
real_link_commands.push_back(cmakeCommand);
}
// Expand placeholders.
for (std::vector<std::string>::iterator i = real_link_commands.begin();
@@ -728,6 +740,7 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules(
commands.insert(commands.end(), commands1.begin(), commands1.end());
commands1.clear();
}
// Add the post-build rules when building but not when relinking.
if (!relink) {
this->LocalGenerator->AppendCustomCommands(