Make "fbc -print x" print just the exeext again (e90b3d3 regression)

Since e90b3d3, -print x was broken: "fbc -print x" now gave
unnamed[.exe] instead of just [.exe], because the -print option handling
was moved behind the code that sets fbc.mainname (fbcInit2() back then, now
fbcDetermineMainName()), and no longer made a difference between whether input
files were given or not.

However, -print x without input files should not do fbcDetermineMainName(),
so fbc.outname ends up being only the .exe extension.

Author: dkl

src/compiler/fbc.bas

@@ -3353,7 +3353,10 @@ end sub
 	'' the command line ones, so those will be searched first)
 	fbAddIncludePath( fbc.incpath )
 
-	fbcDetermineMainName( )
+	var have_input_files = (listGetHead( @fbc.modules   ) <> NULL) or _
+	                       (listGetHead( @fbc.objlist   ) <> NULL) or _
+	                       (listGetHead( @fbc.libs.list ) <> NULL) or _
+	                       (listGetHead( @fbc.libfiles  ) <> NULL)
 
 	'' Answer -print query, if any, and stop
 	'' The -print option is intended to allow shell scripts, makefiles, etc.
@@ -3365,6 +3368,11 @@ end sub
 		case PRINT_TARGET
 			print fbGetTargetId( )
 		case PRINT_X
+			'' If we have input files, -print x should give the output name that we'd normally get.
+			'' However, a plain "fbc -print x" without input files should just give the .exe extension.
+			if( have_input_files ) then
+				fbcDetermineMainName( )
+			end if
 			hSetOutName( )
 			print fbc.outname
 		case PRINT_FBLIBDIR
@@ -3373,11 +3381,10 @@ end sub
 		fbcEnd( 0 )
 	end if
 
+	fbcDetermineMainName( )
+
 	'' Show help if there are no input files
-	if( (listGetHead( @fbc.modules   ) = NULL) and _
-	    (listGetHead( @fbc.objlist   ) = NULL) and _
-	    (listGetHead( @fbc.libs.list ) = NULL) and _
-	    (listGetHead( @fbc.libfiles  ) = NULL) ) then
+	if( have_input_files = FALSE ) then
 		hPrintOptions( )
 		fbcEnd( 1 )
 	end if

tests/fbcprint/results.txt

@@ -1,5 +1,5 @@
--print x -target win32 = unnamed.exe
--print x -target linux = unnamed
+-print x -target win32 = .exe
+-print x -target linux = 
 -print x 1.bas -target win32 = 1.exe
 -print x lib1.a -target win32 = unnamed.exe
 -print x 1.o -target win32 = 1.exe