C++ debug info regressions in 4.5

[Ulrich Weigand]

Running the GDB test suite against Linaro GCC 4.5 results in nearly 150 C++ test failures; with Linaro GCC 4.4 we see only 5.

Nearly all of those failures are caused by the problem described in this upstream bug report:

[4.5 Regression] in-class func-ptr type parameter has unspecified DW_AT_type
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43628

which actually is already fixed in both mainline and the 4.5 branch, but the fix is not yet in GCC 4.5.1

In addition, two further failures are due to this bug:

pointer type information lost in debuginfo
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45088

which -as of now- does not yet have an upstream fix.

All these are platform-independent problems.

[Michael Hope (michaelh1)]

Ulrich, can you confirm that this was fixed with the GCC 4.5.1+svn merge done for Linaro GCC 4.5-2010.10-0 please?

[Ulrich Weigand (uweigand)]

The patch to fix PR 42638 is now present in GCC Linaro 4.5. I've not yet run the test suite ...

[Ulrich Weigand (uweigand)]

Testing on x86 confirms that most of the regressions are now gone due to the PR 42638 fix.

The following regressions remain; as mentioned in the bug report, these are due to bug PR 45088:
FAIL: gdb.cp/class2.exp: p acp->c1
FAIL: gdb.cp/class2.exp: p acp->c2
If you prefer, we can open a second bug to track these. (There is no fix available upstream yet.)

In addition, I'm now seeing yet another failure:
FAIL: gdb.cp/temargs.exp: test value of P in inner_m
Not sure yet what causes this one.

[Michael Hope (michaelh1)]

Split the second set into #662324. Closing this.