From c01239c5e01e7df995893c3132147ef2a4c8ceb9 Mon Sep 17 00:00:00 2001
From: silverweed <silverweed14@proton.me>
Date: Thu, 12 Dec 2024 14:16:22 +0100
Subject: [PATCH] [ntuple] change filesystem::path to std::string for
 fOutputPath

---
 tree/ntupleutil/v7/inc/ROOT/RNTupleExporter.hxx | 5 +++--
 tree/ntupleutil/v7/src/RNTupleExporter.cxx      | 2 +-
 tree/ntupleutil/v7/test/CMakeLists.txt          | 4 ++++
 tree/ntupleutil/v7/test/ntuple_exporter.cxx     | 9 +++++----
 tree/ntupleutil/v7/test/ntupleutil_test.hxx     | 3 +--
 5 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/tree/ntupleutil/v7/inc/ROOT/RNTupleExporter.hxx b/tree/ntupleutil/v7/inc/ROOT/RNTupleExporter.hxx
index a3ba684fa0ddc..c219b9bd2c15d 100644
--- a/tree/ntupleutil/v7/inc/ROOT/RNTupleExporter.hxx
+++ b/tree/ntupleutil/v7/inc/ROOT/RNTupleExporter.hxx
@@ -16,7 +16,8 @@
 #ifndef ROOT7_RNTupleExporter
 #define ROOT7_RNTupleExporter
 
-#include <filesystem>
+#include <cstdint>
+#include <string>
 #include <vector>
 
 namespace ROOT::Experimental::Internal {
@@ -35,7 +36,7 @@ public:
          kDefaults = kShowProgressBar
       };
 
-      std::filesystem::path fOutputPath;
+      std::string fOutputPath;
       std::uint64_t fFlags;
 
       RPagesOptions() : fOutputPath("."), fFlags(kDefaults) {}
diff --git a/tree/ntupleutil/v7/src/RNTupleExporter.cxx b/tree/ntupleutil/v7/src/RNTupleExporter.cxx
index e3d6b53226093..adba049318520 100644
--- a/tree/ntupleutil/v7/src/RNTupleExporter.cxx
+++ b/tree/ntupleutil/v7/src/RNTupleExporter.cxx
@@ -134,7 +134,7 @@ RNTupleExporter::RPagesResult RNTupleExporter::ExportPages(RPageSource &source,
             const bool incChecksum = (options.fFlags & RPagesOptions::kIncludeChecksums) != 0 && pageInfo.fHasChecksum;
             const std::size_t maybeChecksumSize = incChecksum * 8;
             const std::uint64_t pageBufSize = pageInfo.fLocator.fBytesOnStorage + maybeChecksumSize;
-            std::ostringstream ss{options.fOutputPath.string(), std::ios_base::ate};
+            std::ostringstream ss{options.fOutputPath, std::ios_base::ate};
             ss << "/cluster_" << clusterDesc.GetId() << "_" << colInfo.fQualifiedName << "_page_" << pageIdx
                << "_elems_" << pageInfo.fNElements << "_comp_" << colRange.fCompressionSettings << ".page";
             const auto outFileName = ss.str();
diff --git a/tree/ntupleutil/v7/test/CMakeLists.txt b/tree/ntupleutil/v7/test/CMakeLists.txt
index a2308a0a958c0..9dfe739fbd9ac 100644
--- a/tree/ntupleutil/v7/test/CMakeLists.txt
+++ b/tree/ntupleutil/v7/test/CMakeLists.txt
@@ -22,3 +22,7 @@ endif()
 ROOT_ADD_GTEST(ntuple_importer ntuple_importer.cxx LIBRARIES ROOTNTupleUtil CustomStructUtil)
 ROOT_ADD_GTEST(ntuple_exporter ntuple_exporter.cxx LIBRARIES ROOTNTupleUtil)
 ROOT_ADD_GTEST(ntuple_inspector ntuple_inspector.cxx LIBRARIES ROOTNTupleUtil)
+
+if (CMAKE_COMPILER_IS_GNUCC AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
+    target_link_libraries(ntuple_exporter stdc++fs)
+endif()
diff --git a/tree/ntupleutil/v7/test/ntuple_exporter.cxx b/tree/ntupleutil/v7/test/ntuple_exporter.cxx
index 056f6a704a2b5..15b56ebff50cc 100644
--- a/tree/ntupleutil/v7/test/ntuple_exporter.cxx
+++ b/tree/ntupleutil/v7/test/ntuple_exporter.cxx
@@ -3,6 +3,7 @@
 #include <ROOT/RNTupleModel.hxx>
 
 #include "ntupleutil_test.hxx"
+#include <filesystem>
 
 using namespace ROOT::Experimental;
 
@@ -268,7 +269,7 @@ TEST(RNTupleExporter, ExportToFilesCustomPath)
    }
 
    // create tmp directory
-   static const std::filesystem::path kDirName = "rntuple_exporter_custom_path";
+   static const std::string kDirName = "rntuple_exporter_custom_path";
    bool ok = std::filesystem::create_directory(kDirName);
    if (!ok) {
       FAIL() << "failed to create directory " << kDirName;
@@ -286,9 +287,9 @@ TEST(RNTupleExporter, ExportToFilesCustomPath)
 
    EXPECT_EQ(res.fExportedFileNames.size(), 3);
 
-   FileRaii pageVecIdx(kDirName / "cluster_0_vec-0_page_0_elems_100_comp_505.page");
-   FileRaii pageVec(kDirName / "cluster_0_vec._0-0_page_0_elems_2000_comp_505.page");
-   FileRaii pageFlt(kDirName / "cluster_0_flt-0_page_0_elems_100_comp_505.page");
+   FileRaii pageVecIdx(kDirName + "/cluster_0_vec-0_page_0_elems_100_comp_505.page");
+   FileRaii pageVec(kDirName + "/cluster_0_vec._0-0_page_0_elems_2000_comp_505.page");
+   FileRaii pageFlt(kDirName + "/cluster_0_flt-0_page_0_elems_100_comp_505.page");
 
    EXPECT_TRUE(std::find(res.fExportedFileNames.begin(), res.fExportedFileNames.end(), pageFlt.GetPath()) !=
                res.fExportedFileNames.end());
diff --git a/tree/ntupleutil/v7/test/ntupleutil_test.hxx b/tree/ntupleutil/v7/test/ntupleutil_test.hxx
index 669691d528549..287acea7de756 100644
--- a/tree/ntupleutil/v7/test/ntupleutil_test.hxx
+++ b/tree/ntupleutil/v7/test/ntupleutil_test.hxx
@@ -9,7 +9,6 @@
 #include <ROOT/RNTupleReader.hxx>
 #include <ROOT/RNTupleWriteOptions.hxx>
 #include <ROOT/RNTupleWriter.hxx>
-#include <filesystem>
 
 /**
  * An RAII wrapper around an open temporary file on disk. It cleans up the
@@ -27,7 +26,7 @@ public:
    ~FileRaii()
    {
       if (!fPreserveFile)
-         std::filesystem::remove(fPath.c_str());
+         std::remove(fPath.c_str());
    }
    std::string GetPath() const { return fPath; }