Modernize: Use #pragma once in all header files

#pragma once is a widely supported compiler pragma, even though it is
not part of the C++ standard. Many of the issues keeping #pragma once
from being standardized (distributed filesystems, build farms, hard
links, etc.) do not apply to CMake - it is easy to build CMake on a
single machine. CMake also does not install any header files which can
be consumed by other projects (though cmCPluginAPI.h has been
deliberately omitted from this conversion in case anyone is still using
it.) Finally, #pragma once has been required to build CMake since at
least August 2017 (7f29bbe6 enabled server mode unconditionally, which
had been using #pragma once since September 2016 (b13d3e0d)). The fact
that we now require C++11 filters out old compilers, and it is unlikely
that there is a compiler which supports C++11 but does not support
#pragma once.

1 files changed, 1 insertions, 4 deletions

diff --git a/Source/cmString.hxx b/Source/cmString.hxx
index 40fe20d..b41b960 100644
--- a/Source/cmString.hxx
+++ b/Source/cmString.hxx
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmString_hxx
-#define cmString_hxx
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -928,5 +927,3 @@ struct hash<cm::String>
   }
 };
 }
-
-#endif