Bump CMAKE_CXX_STANDARD to 23 and fix code

ftparchive/contents.h failed with operator< defined only,
so define operator<=> instead.

The operator and FileCopyType constructor both had a warning
about not throwing and adding a noexcept, so add one

3 files changed, 3 insertions, 3 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9b4773d63..23eeba49b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -64,7 +64,7 @@ add_definitions(${LFS_DEFINITIONS})
 link_libraries(${LFS_LIBRARIES})
 
 # Set compiler flags
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_VISIBILITY_INLINES_HIDDEN 1)
 
diff --git a/ftparchive/contents.h b/ftparchive/contents.h
index e23191cd3..a78f9d5e9 100644
--- a/ftparchive/contents.h
+++ b/ftparchive/contents.h
@@ -27,7 +27,7 @@ class GenContents
    {
       const char *data;
       const char *c_str() const { return data; }
-      bool operator<(const StringInBlock &other) const { return strcmp(data, other.data) < 0; }
+      auto operator<=>(const StringInBlock &other) const noexcept { return strcmp(data, other.data); }
    };
    struct BigBlock
    {
diff --git a/methods/copy.cc b/methods/copy.cc
index e3f2a29a2..91f831e30 100644
--- a/methods/copy.cc
+++ b/methods/copy.cc
@@ -41,7 +41,7 @@ bool CopyMethod::URIAcquire(std::string const &Message, FetchItem *Itm)
    struct FileCopyType {
       std::string name;
       struct stat stat{};
-      explicit FileCopyType(std::string &&file) : name{std::move(file)} {}
+      explicit FileCopyType(std::string &&file) noexcept : name{std::move(file)} {}
    };
    std::vector<FileCopyType> files;
    // this ensures that relative paths work