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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmLinkLineDeviceComputer.h"
#include <algorithm>
#include <set>
#include <sstream>
#include <utility>
#include <vector>
#include "cmAlgorithms.h"
#include "cmComputeLinkInformation.h"
#include "cmGeneratorTarget.h"
#include "cmGlobalGenerator.h"
#include "cmLocalGenerator.h"
#include "cmStateDirectory.h"
#include "cmStateSnapshot.h"
#include "cmStateTypes.h"
#include "cmSystemTools.h"
class cmOutputConverter;
cmLinkLineDeviceComputer::cmLinkLineDeviceComputer(
cmOutputConverter* outputConverter, cmStateDirectory const& stateDir)
: cmLinkLineComputer(outputConverter, stateDir)
{
}
cmLinkLineDeviceComputer::~cmLinkLineDeviceComputer() = default;
static bool cmLinkItemValidForDevice(std::string const& item)
{
// Valid items are:
// * Non-flags (does not start in '-')
// * Specific flags --library, --library-path, -l, -L
// For example:
// * 'cublas_device' => pass-along
// * '--library pthread' => pass-along
// * '-lpthread' => pass-along
// * '-pthread' => drop
// * '-a' => drop
// * '-framework Name' (as one string) => drop
return (!cmHasLiteralPrefix(item, "-") || //
cmHasLiteralPrefix(item, "-l") || //
cmHasLiteralPrefix(item, "-L") || //
cmHasLiteralPrefix(item, "--library"));
}
bool cmLinkLineDeviceComputer::ComputeRequiresDeviceLinking(
cmComputeLinkInformation& cli)
{
// Determine if this item might requires device linking.
// For this we only consider targets
typedef cmComputeLinkInformation::ItemVector ItemVector;
ItemVector const& items = cli.GetItems();
std::string config = cli.GetConfig();
for (auto const& item : items) {
if (item.Target &&
item.Target->GetType() == cmStateEnums::STATIC_LIBRARY) {
if ((!item.Target->GetPropertyAsBool("CUDA_RESOLVE_DEVICE_SYMBOLS")) &&
item.Target->GetPropertyAsBool("CUDA_SEPARABLE_COMPILATION")) {
// this dependency requires us to device link it
return true;
}
}
}
return false;
}
std::string cmLinkLineDeviceComputer::ComputeLinkLibraries(
cmComputeLinkInformation& cli, std::string const& stdLibString)
{
// Write the library flags to the build rule.
std::ostringstream fout;
// Generate the unique set of link items when device linking.
// The nvcc device linker is designed so that each static library
// with device symbols only needs to be listed once as it doesn't
// care about link order.
std::set<std::string> emitted;
typedef cmComputeLinkInformation::ItemVector ItemVector;
ItemVector const& items = cli.GetItems();
std::string config = cli.GetConfig();
bool skipItemAfterFramework = false;
for (auto const& item : items) {
if (skipItemAfterFramework) {
skipItemAfterFramework = false;
continue;
}
if (item.Target) {
bool skip = false;
switch (item.Target->GetType()) {
case cmStateEnums::MODULE_LIBRARY:
case cmStateEnums::INTERFACE_LIBRARY:
skip = true;
break;
case cmStateEnums::STATIC_LIBRARY:
skip = item.Target->GetPropertyAsBool("CUDA_RESOLVE_DEVICE_SYMBOLS");
break;
default:
break;
}
if (skip) {
continue;
}
}
std::string out;
if (item.IsPath) {
// nvcc understands absolute paths to libraries ending in '.a' or '.lib'.
// These should be passed to nvlink. Other extensions need to be left
// out because nvlink may not understand or need them. Even though it
// can tolerate '.so' or '.dylib' it cannot tolerate '.so.1'.
if (cmHasLiteralSuffix(item.Value, ".a") ||
cmHasLiteralSuffix(item.Value, ".lib")) {
out += this->ConvertToOutputFormat(
this->ConvertToLinkReference(item.Value));
}
} else if (item.Value == "-framework") {
// This is the first part of '-framework Name' where the framework
// name is specified as a following item. Ignore both.
skipItemAfterFramework = true;
continue;
} else if (cmLinkItemValidForDevice(item.Value)) {
out += item.Value;
}
if (emitted.insert(out).second) {
fout << out << " ";
}
}
if (!stdLibString.empty()) {
fout << stdLibString << " ";
}
return fout.str();
}
std::string cmLinkLineDeviceComputer::GetLinkerLanguage(cmGeneratorTarget*,
std::string const&)
{
return "CUDA";
}
bool requireDeviceLinking(cmGeneratorTarget& target, cmLocalGenerator& lg,
const std::string& config)
{
if (!target.GetGlobalGenerator()->GetLanguageEnabled("CUDA")) {
return false;
}
if (target.GetType() == cmStateEnums::OBJECT_LIBRARY) {
return false;
}
if (const char* resolveDeviceSymbols =
target.GetProperty("CUDA_RESOLVE_DEVICE_SYMBOLS")) {
// If CUDA_RESOLVE_DEVICE_SYMBOLS has been explicitly set we need
// to honor the value no matter what it is.
return cmSystemTools::IsOn(resolveDeviceSymbols);
}
if (const char* separableCompilation =
target.GetProperty("CUDA_SEPARABLE_COMPILATION")) {
if (cmSystemTools::IsOn(separableCompilation)) {
bool doDeviceLinking = false;
switch (target.GetType()) {
case cmStateEnums::SHARED_LIBRARY:
case cmStateEnums::MODULE_LIBRARY:
case cmStateEnums::EXECUTABLE:
doDeviceLinking = true;
break;
default:
break;
}
return doDeviceLinking;
}
}
// Determine if we have any dependencies that require
// us to do a device link step
const std::string cuda_lang("CUDA");
cmGeneratorTarget::LinkClosure const* closure =
target.GetLinkClosure(config);
bool closureHasCUDA =
(std::find(closure->Languages.begin(), closure->Languages.end(),
cuda_lang) != closure->Languages.end());
if (closureHasCUDA) {
cmComputeLinkInformation* pcli = target.GetLinkInformation(config);
if (pcli) {
cmLinkLineDeviceComputer deviceLinkComputer(
&lg, lg.GetStateSnapshot().GetDirectory());
return deviceLinkComputer.ComputeRequiresDeviceLinking(*pcli);
}
return true;
}
return false;
}
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