target_sources: Interpret relative paths as relative to the calling directory

Previously the command considered non-absolute source file paths relative to
the associated target on the LHS. This causes problems in incremental builds
where files are added from subdirectories and forces users to workaround by
manually converting to absolute paths. Change this to enable more intuitive
usage by projects.

Fixes #17981

1 files changed, 9 insertions, 0 deletions

diff --git a/Source/cmTargetSourcesCommand.h b/Source/cmTargetSourcesCommand.h
index ea8776a..b01e3ca 100644
--- a/Source/cmTargetSourcesCommand.h
+++ b/Source/cmTargetSourcesCommand.h
@@ -29,6 +29,11 @@ public:
   bool InitialPass(std::vector<std::string> const& args,
                    cmExecutionStatus& status) override;
 
+protected:
+  void HandleInterfaceContent(cmTarget* tgt,
+                              const std::vector<std::string>& content,
+                              bool prepend, bool system) override;
+
 private:
   void HandleMissingTarget(const std::string& name) override;
 
@@ -37,6 +42,10 @@ private:
                            bool prepend, bool system) override;
 
   std::string Join(const std::vector<std::string>& content) override;
+
+  std::vector<std::string> ConvertToAbsoluteContent(
+    cmTarget* tgt, const std::vector<std::string>& content,
+    bool isInterfaceContent);
 };
 
 #endif