[gcc r14-344] testsuite: Handle empty assembly lines in check-function-bodies

[Hans-Peter Nilsson <hp@gcc.gnu.org>]

https://gcc.gnu.org/g:5cf6160a690a9cc829c34163f2de617faa3da341

commit r14-344-g5cf6160a690a9cc829c34163f2de617faa3da341
Author: Hans-Peter Nilsson <hp@axis.com>
Date:   Fri Apr 28 17:48:33 2023 +0200

    testsuite: Handle empty assembly lines in check-function-bodies
    
    I tried to make use of check-function-bodies for cris-elf and was a
    bit surprised to see it failing.  There's a deliberate empty line
    after the filled delay slot of the return-function which was
    mishandled.  I thought "aha" and tried to add an empty line
    (containing just a "**" prefix) to the match, but that didn't help.
    While it was added as input from the function's assembly output
    to-be-matched like any other line, it couldn't be matched: I had to
    use "...", which works but is...distracting.
    
    Some digging shows that an empty assembly line can't be deliberately
    matched because all matcher lines (lines starting with the prefix,
    the ubiquitous "**") are canonicalized by trimming leading
    whitespace (the "string trim" in check-function-bodies) and instead
    adding a leading TAB character, thus empty lines end up containing
    just a TAB.  For usability it's better to treat empty lines as fluff
    than to uglifying the test-case and the code to properly match them.
    Double-checking, no test-case tries to match an line containing just
    TAB (by providing an a line containing just "**\s*", i.e. zero or
    more whitespace characters).
    
            * lib/scanasm.exp (parse_function_bodies): Set fluff to include
            empty lines (besides optionally leading whitespace).

Diff:
---
 gcc/testsuite/lib/scanasm.exp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/lib/scanasm.exp b/gcc/testsuite/lib/scanasm.exp
index fb53544d40c..be2b83a5dd4 100644
--- a/gcc/testsuite/lib/scanasm.exp
+++ b/gcc/testsuite/lib/scanasm.exp
@@ -791,7 +791,7 @@ proc parse_function_bodies { filename result } {
     set terminator {^\s*\.size}
 
     # Regexp for lines that aren't interesting.
-    set fluff {^\s*(?:\.|//|@)}
+    set fluff {^\s*(?:\.|//|@|$)}
 
     set fd [open $filename r]
     set in_function 0