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VMS: mitigate for the C++ compiler that doesn't understand certain pragmas

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This only affects __DECC_INCLUDE_EPILOGUE.H and __DECC_INCLUDE_PROLOGUE.H,
which are used automatically by HP and VSI C/C++ compilers.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/11159)

(cherry picked from commit 605a0c709f)
This commit is contained in:
Richard Levitte 2020-02-24 14:56:26 +01:00
parent c50604eb4a
commit f33ca114c1
3 changed files with 30 additions and 5 deletions
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13
CHANGES.md
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@ -935,6 +935,19 @@ OpenSSL 1.1.1
### Changes between 1.1.1d and 1.1.1e [xx XXX xxxx] ###
* *[VMS only]* The header files that the VMS compilers include automatically,
`__DECC_INCLUDE_PROLOGUE.H` and `__DECC_INCLUDE_EPILOGUE.H`, use pragmas
that the C++ compiler doesn't understand. This is a shortcoming in the
compiler, but can be worked around with `__cplusplus` guards.
C++ applications that use OpenSSL libraries must be compiled using the
qualifier `/NAMES=(AS_IS,SHORTENED)` to be able to use all the OpenSSL
functions. Otherwise, only functions with symbols of less than 31
characters can be used, as the linker will not be able to successfully
resolve symbols with longer names.
*Richard Levitte*
* Added a new method to gather entropy on VMS, based on SYS$GET_ENTROPY.
The presence of this system service is determined at run-time.

10
include/openssl/__DECC_INCLUDE_EPILOGUE.H
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@ -8,9 +8,15 @@
*/
/*
* This file is only used by HP C on VMS, and is included automatically
* This file is only used by HP C/C++ on VMS, and is included automatically
* after each header file from this directory
*/
/*
* The C++ compiler doesn't understand these pragmas, even though it
* understands the corresponding command line qualifier.
*/
#ifndef __cplusplus
/* restore state. Must correspond to the save in __decc_include_prologue.h */
#pragma names restore
# pragma names restore
#endif

12
include/openssl/__DECC_INCLUDE_PROLOGUE.H
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@ -8,13 +8,19 @@
*/
/*
* This file is only used by HP C on VMS, and is included automatically
* This file is only used by HP C/C++ on VMS, and is included automatically
* after each header file from this directory
*/
/*
* The C++ compiler doesn't understand these pragmas, even though it
* understands the corresponding command line qualifier.
*/
#ifndef __cplusplus
/* save state */
#pragma names save
# pragma names save
/* have the compiler shorten symbols larger than 31 chars to 23 chars
* followed by a 8 hex char CRC
*/
#pragma names as_is,shortened
# pragma names as_is,shortened
#endif