Re: [RFC PATCH 2/2] fix py-value-cc.exp test for big endian target

[Yao Qi <yao@codesourcery.com>]

Victor Kamensky <victor.kamensky@linaro.org> writes:

> The reason is that test case is not endian agnostic.
> Test program variable 'u' has type of 'union U { int a;
> char c; };'. Test program writes 99 into u.a and expects to see
> it in field 'u.c'. But it would only work on little endian
> system where 'c' field of U union conicide with least
> significant byte of 'a' field.

Yes, that make senses to me, and we've seen this fail on powerpc too.

> diff --git a/gdb/testsuite/gdb.python/py-value-cc.cc b/gdb/testsuite/gdb.python/py-value-cc.cc
> index 7ea4f5d..d6d4d35 100644
> --- a/gdb/testsuite/gdb.python/py-value-cc.cc
> +++ b/gdb/testsuite/gdb.python/py-value-cc.cc
> @@ -77,7 +77,7 @@ func (const A &a)
>    Btd &b_td = b1;
>  
>    U u;
> -  u.a = 99;
> +  u.a = 0x55000055; /* c is the same for big and little endian */

I'd like c is shown differently on big endian and little endian, and
check c's value in different endianness.  It can be something like,

 u.a = 0x55000056 or u.a = 0x55565758

>  
>    X x;
>    x.x = 101;
> diff --git a/gdb/testsuite/gdb.python/py-value-cc.exp b/gdb/testsuite/gdb.python/py-value-cc.exp
> index 949f04f..56003c3 100644
> --- a/gdb/testsuite/gdb.python/py-value-cc.exp
> +++ b/gdb/testsuite/gdb.python/py-value-cc.exp
> @@ -85,8 +85,8 @@ gdb_test "python print(b_td\[b_fields\[0\]\].type.target())" "A" \
>  gdb_test "python print(b_td\[b_fields\[0\]\]\['a'\])" "100" \
>    "b_td.A::a via field"
>  
> -gdb_test "python print(u\[u_fields\[0\]\])" "99.*" "u's first field via field"
> -gdb_test "python print(u\[u_fields\[1\]\])" "99.*" "u's second field via field"
> +gdb_test "python print(u\[u_fields\[0\]\])" "1426063445.*" "u's first field via field"

The ".*" in the pattern can be removed.

> +gdb_test "python print(u\[u_fields\[1\]\])" "85.*" "u's second field via field"

This pattern can be stricter by adding space between 85 and ".*".

-- 
Yao (齐尧)