[Bug c++/63522] [4.8/4.9/5 Regression] ICE: unexpected expression 'ElementIndices' of kind template_parm_index

["aaron.mcdaid at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63522

aaron.mcdaid at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |aaron.mcdaid at gmail dot com

--- Comment #5 from aaron.mcdaid at gmail dot com ---
Hi,
In which versions has this been fixed? I'm running 4.9.3 and it crashes with
this fragment. I had assumed that 4.9.3 was very up-to-date (as of July 2015).

Perhaps this was fixed in the 5.x series and wasn't included in the recent
4.9.3 release?

I also have a different piece of code that gives a very similar error. I'm not
sure if I've found a new bug or not. In the following code, it will compile
cleanly if I put a return statement inside function template `a`, or if I
replace the return type with the simpler (non-decltype) version that is
currently commented out. Otherwise it crashes with "
unexpected expression ‘i’ of kind template_parm_index"

  ~/prefix-gcc-4.9.3/bin/g++ -std=c++11 -Wall -Wextra


template<int i>
struct int_c {
    static
    constexpr int value = i;
};

template<int... c>
struct Pack {
};


template<int... i>
static
auto a() ->
Pack< decltype(int_c<i>()) :: value ... >
//Pack<  int_c<i>          :: value ... >
{
}

int main() {
    a<0>();
}
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Subject: [Bug libfortran/66861] [5/6 Regression] Segmentation fault in gcc/testsuite/gfortran.dg/streamio_5.f90
Date: Mon, 13 Jul 2015 18:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf861

Janne Blomqvist <jb at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2015-07-13
     Ever confirmed|0                           |1

--- Comment #2 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Hmm, does the following patch fix it?

diff --git a/libgfortran/io/unix.c b/libgfortran/io/unix.c
index e5fc6e1..0048e24 100644
--- a/libgfortran/io/unix.c
+++ b/libgfortran/io/unix.c
@@ -1570,7 +1570,7 @@ find_file0 (gfc_unit *u, FIND_FILE0_DECL)
     }
   else
 # endif
-    if (strcmp (u->filename, path) == 0)
+    if (u->filename && strcmp (u->filename, path) == 0)
       return u;
 #endif


(Sorry, I don't have a windows machine to test on myself..)