[Bug middle-end/59470] New: [4.8 Regression] libstdc++ miscompilation after r205709

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59470

            Bug ID: 59470
           Summary: [4.8 Regression] libstdc++ miscompilation after
                    r205709
           Product: gcc
           Version: 4.8.3
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
            Target: i686-linux

I've noticed recent regressions
+FAIL: 22_locale/num_put/put/char/11.cc execution test
+FAIL: 22_locale/num_put/put/char/20914.cc execution test
+FAIL: 22_locale/num_put/put/char/23953.cc execution test
+FAIL: 22_locale/num_put/put/char/3.cc execution test
+FAIL: 22_locale/num_put/put/char/9780-2.cc execution test
+FAIL: 22_locale/num_put/put/char/wrapped_env.cc execution test
+FAIL: 22_locale/num_put/put/char/wrapped_locale.cc execution test
+FAIL: 27_io/manipulators/basefield/char/1.cc execution test
on i686-linux in our vendor build, but apparently this is reproduceable also on
the vanilla branches/gcc-4_8-branch.  I'll attach locale-inst.ii (the libstdc++
src/c++98 source) and 11.ii (the first of the above mentioned failing tests).

/usr/src/gcc-4.8/obj/gcc/cc1plus.205708 -O2 -fstack-protector -m32 -fPIC \
locale-inst.ii -o locale-inst.s  -march=i686 -quiet; \
gcc -o 11 11.ii -m32 locale-inst.s -lstdc++ -lm; ./11
works fine, while:
/usr/src/gcc-4.8/obj/gcc/cc1plus.205709 -O2 -fstack-protector -m32 -fPIC \
locale-inst.ii -o locale-inst.s  -march=i686 -quiet; \
gcc -o 11 11.ii -m32 locale-inst.s -lstdc++ -lm; ./11
11:
/builddir/build/BUILD/gcc-4.8.2-20131209/libstdc++-v3/testsuite/22_locale/num_put/put/char/11.cc:52:
void test01(): Assertion `result1 == "1,2,3,45,678"' failed.
Aborted (core dumped)