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Job:	job000019

Status:	closed

Project:	jam

Severity:	B

ReportedBy:	ghost@cs.msu.su

ReportedDate:	2002/03/23 09:50:00

ModifiedBy:	shawn_hladky

ModifiedDate:	2008/04/13 13:00:54

Description:
	if ( "" a b ) returns false; was true in 2.3 
	
	| From: Vladimir Prus <ghost@cs.msu.su>
	| To: jamming@perforce.com, jamboost@yahoogroups.com
	| Date: Fri, 22 Mar 2002 12:58:50 +0300
	| Subject: [jamming] "if" behaviour change from 2.3  to 2.4
	| 
	| 
	| Hi,
	| the following code:
	| 
	|     l = "" a b ;
	| 
	|     if $(l) {
	|         ECHO "Okay" ;
	|     }
	| 
	| Behaves differently in 2.3 and the most most recent version from the public 
	| depot. Should this be considered a bug? 
	| 
	| The problem is in compile.c:
	|         LIST *
	|         compile_eval(
	|                 PARSE   *parse,
	|                 LOL     *args )
	|         {
	|         ...........................
	|                 switch( parse->num )
	|                 {
	|                 case EXPR_EXISTS:
	|                         if( ll && ll->string[0] ) status = 1;
	|                         ^^^^^^^^ here's the problem
	|                                    should check all the elements of the list.
	| It appears to be trivial to fix.
	| 
	| - Volodya
	|