FIX: Combining -4Yb with -Ox May Cause Invalid Run-Time ErrorsLast reviewed: September 18, 1997Article ID: Q110002 |
1.00 1.00a | 1.00
MS-DOS | WINDOWS NTkbtool kbfixlist The information in this article applies to:
SYMPTOMSOn some rare boundary cases, using optimizations (-Ox) with extended error handling ($DEBUG or -4Yb) can cause invalid run-time errors to be output, such as:
run-time error F6096: $DEBUG - array subscript expression out of range RESOLUTIONIf you have determined that a run-time error such as the above is not correct for the code indicated, you can prevent your program from terminating with the error. To do this, place a $NODEBUG metacommand before the line of code that is being flagged, and place a $DEBUG metacommand after it.
STATUSMicrosoft has confirmed this to be a problem in FORTRAN PowerStation 32 for Windows NT and MS-DOS, version 1.0 and 1.0A. This problem was corrected in FORTRAN PowerStation 32, version 4.0.
MORE INFORMATIONThe sample below illustrates the problem:
Sample Codec Compile options required: -Ox -4Yb c CHARACTER CA(512),CB(512),CC(512) OPEN(7,FILE='N117.TMP',FORM='UNFORMATTED',RECL=128, + ACCESS='DIRECT') DO 10 I=1,512 CA(I)=CHAR(48)10 CONTINUE DO 20 I=1,16 WRITE(7,REC=I) (CA(J),J=(I-1)*32+1,(I-1)*32+32)c The F6096 error incorrectly occurs on the following line. WRITE(7,REC=16+I) (CA(J),J=(16-I)*32+32,(16-I)*32+1,-1)20 CONTINUE DO 30 I=1,16 IE1=(16-I)*32+32 IE2=(16-I)*32+1 READ(7,REC=I+16) (CC(J),J=IE1,IE2,-1)30 CONTINUE IE=1 DO 40 I=1,512 IF(CA(I).NE.CB(I).OR.CA(I).NE.CC(I)) IE=040 CONTINUE END |
Additional reference words: 1.00
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