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The compiler does not support #pragma once

I have a compiler (PGI) that does not support

#pragma once

but the library (pull) I would like to include is using them.

Is there a workaround for the problem?

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2 answers


You can use guardonce to convert statements #pragma once

to standard #ifndef ...

include guard.

The following worked for me:

cd /tmp
git clone https://github.com/thrust/thrust.git
git clone https://github.com/cgmb/guardonce.git
cd guardonce
git checkout v2.0.0
python -m guardonce.once2guard -r "/tmp/thrust/thrust/"


This creates included guards in every thrust header file:

 git diff /tmp/thrust


--- a/thrust/adjacent_difference.h
+++ b/thrust/adjacent_difference.h
@@ -19,7 +19,8 @@
  *  \brief Compute difference between consecutive elements of a range
  */

-#pragma once
+#ifndef ADJACENT_DIFFERENCE_H
+#define ADJACENT_DIFFERENCE_H

. . .
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Well macros (and therefore #pragma) are preprocessing (cpp so as not to go wrong with the C ++ extension), so in theory you could try using a preprocessor that supports #pragma and then build the resulting code with the compiler.



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