Xcode: Add support of DEPFILE for add_custom_command

Issue: #20286

1 files changed, 12 insertions, 2 deletions

diff --git a/Source/cmTransformDepfile.cxx b/Source/cmTransformDepfile.cxx
index 78aa4b2df3..b693582ec3 100644
--- a/Source/cmTransformDepfile.cxx
+++ b/Source/cmTransformDepfile.cxx
@@ -2,6 +2,7 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmTransformDepfile.h"
 
+#include <functional>
 #include <string>
 #include <type_traits>
 #include <utility>
@@ -13,6 +14,7 @@
 
 #include "cmGccDepfileReader.h"
 #include "cmGccDepfileReaderTypes.h"
+#include "cmGlobalGenerator.h"
 #include "cmLocalGenerator.h"
 #include "cmSystemTools.h"
 
@@ -38,6 +40,14 @@ void WriteGccDepfile(cmsys::ofstream& fout, const cmLocalGenerator& lg,
                      const cmGccDepfileContent& content)
 {
   const auto& binDir = lg.GetBinaryDirectory();
+  std::function<std::string(const std::string&)> formatPath =
+    [&lg, &binDir](const std::string& path) -> std::string {
+    return lg.MaybeConvertToRelativePath(binDir, path);
+  };
+  if (lg.GetGlobalGenerator()->GetName() == "Xcode") {
+    // full paths must be preserved for Xcode compliance
+    formatPath = [](const std::string& path) -> std::string { return path; };
+  }
 
   for (auto const& dep : content) {
     bool first = true;
@@ -46,12 +56,12 @@ void WriteGccDepfile(cmsys::ofstream& fout, const cmLocalGenerator& lg,
         fout << " \\\n  ";
       }
       first = false;
-      WriteFilenameGcc(fout, lg.MaybeConvertToRelativePath(binDir, rule));
+      WriteFilenameGcc(fout, formatPath(rule));
     }
     fout << ':';
     for (auto const& path : dep.paths) {
       fout << " \\\n  ";
-      WriteFilenameGcc(fout, lg.MaybeConvertToRelativePath(binDir, path));
+      WriteFilenameGcc(fout, formatPath(path));
     }
     fout << '\n';
   }