Bug #4105: Bug in numeric.c for Borland compiler

• Status: Closed
• Assignee: -
• Target version: 1.9.1
• ruby -v: ruby 1.9.1p376 (2009-12-07 revision 26041) [i386-mswin32]

[wvdbos (W van den Bos)]

=begin
There is a potential bug in Init_Numeric()

#elif defined(BORLANDC)
/* Turn off floating point exceptions for overflow, etc. */
_control87(MCW_EM, MCW_EM);
#endif

This call wil set the coprocessor in a state that double floating point will become single float when an exception is thrown

See http://qc.embarcadero.com/wc/qcmain.aspx?d=32483 for the workaround.

The next code should eleminate this

#elif defined(BORLANDC)
/* Turn off floating point exceptions for overflow, etc. */
_control87(MCW_EM, MCW_EM);
_control87(_control87(0,0),0x1FFF);
#endif

This will only appear when borland and for example microsoft dll's are mixed.
This can happend when OpenGl dll's are used

Btw. This source is also present in 1.8

I found this problem because I created a borland dll calling the ruby mswin32 version dll
It generated strange errors. A 'puts 0.0' generated a devide by zero in the ruby sprintf implementation
Putting the two _control87 calls in my dll solved this.
I found the same construction in the Ruby source without the second _control87 call :-)
=end

[kosaki (Motohiro KOSAKI)]

=begin

This will only appear when borland and for example microsoft dll's are mixed.
This can happend when OpenGl dll's are used

Btw. This source is also present in 1.8

I found this problem because I created a borland dll calling the ruby mswin32 version dll
It generated strange errors. A 'puts 0.0' generated a devide by zero in the ruby sprintf implementation
Putting the two _control87 calls in my dll solved this.
I found the same construction in the Ruby source without the second _control87 call :-)

Hi

Can you please consider to send a patch? I don't think mainainers have
borland compiler. ;)

=end

[usa (Usaku NAKAMURA)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

=begin
This issue was solved with changeset r29998.
W, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

=end