[ruby-cvs:57794] normal:r50646 (trunk): openssl: use RB_GC_GUARD instead of volatile

[normal at ruby-lang.org]

normal	2015-05-27 10:09:11 +0900 (Wed, 27 May 2015)

  New Revision: 50646

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=50646

  Log:
    openssl: use RB_GC_GUARD instead of volatile
    
    From doc/extension.rdoc:
    >
    > Using the RB_GC_GUARD macro is preferable to using the "volatile"
    > keyword in C.  RB_GC_GUARD has the following advantages:
    >
    > 1) the intent of the macro use is clear
    >
    > 2) RB_GC_GUARD only affects its call site, "volatile" generates some
    >    extra code every time the variable is used, hurting optimization.
    >
    > 3) "volatile" implementations may be buggy/inconsistent in some
    >    compilers and architectures. RB_GC_GUARD is customizable for broken
    >    systems/compilers without those without negatively affecting other
    >    systems.
    
    * ext/openssl/ossl_asn1.c (ossl_asn1_traverse, ossl_asn1_decode,
      ossl_asn1_decode_all): use RB_GC_GUARD instead of volatile
      [ruby-core:69371] [Bug #11185]

  Modified files:
    trunk/ChangeLog
    trunk/ext/openssl/ossl_asn1.c