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[Bug ada/17475] New: [4.0 regression] Ada does not bootstrap on i686-pc-mingw32


I have been attempting unsuccessfully to bootstrap Ada on mainline for about a 
week on i686-pc-mingw32.  (I do not know when the last time it bootstrapped 
successfully was.  Perhaps it never has since 3.4.)

stage1/xgcc.exe -Bstage1/ -B/aaronwl/cs/env/mingw-head-head-head-20040913/i686-
pc-mingw32/bin/ -c -g -O2      -gnatpg -gnata -I- -I. -Iada -
I../../../src/cvs/head/gcc/gcc/ada ../../../src/cvs/head/gcc/gcc/ada/g-
os_lib.adb -o ada/g-os_lib.o
../../../src/cvs/head/gcc/gcc/ada/g-os_lib.adb: In function 
`GNAT.OS_LIB.TO_PATH_STRING_ACCESS':
../../../src/cvs/head/gcc/gcc/ada/g-os_lib.adb:2224: error: Definition in 
block 1 does not dominate use in block 8
for SSA_NAME: D.5660_4
in statement:
ivtmp.684D.6242_60 = &(*return_val$P_ARRAYD.6226_31)[2]{lb: D.5660_4 sz: 1};
+===========================GNAT BUG DETECTED==============================+
| 4.0.0 20040914 (experimental) (i686-pc-mingw32) verify_ssa failed.       |
| Error detected at g-os_lib.adb:2279:1                                    |
| Please submit a bug report; see http://gcc.gnu.org/bugs.html.            |
| Include the entire contents of this bug box in the report.               |
| Include the exact gcc or gnatmake command that you entered.              |
| Also include sources listed below in gnatchop format                     |
| (concatenated together with no headers between files).                   |
+==========================================================================+

Please include these source files with error report
Note that list may not be accurate in some cases, 
so please double check that the problem can still 
be reproduced with the set of files listed.




raised TYPES.UNRECOVERABLE_ERROR : comperr.adb:376
make[2]: *** [ada/g-os_lib.o] Error 1

GNAT also fails at -O1, but not at -O0.

$ stage1/xgcc.exe -v
Using built-in specs.
Configured with: ../../src/cvs/head/gcc/configure --with-dwarf2 --enable-
libmudflap --enable-libgcj --with-win32-nlsapi=unicows --enable-libstdcxx-
allocator=mt --enable-libstdcxx-debug --prefix=/aaronwl/cs/env/mingw-head-head-
head-20040913 --enable-maintainer-mode --with-included-gettext --with-libiconv-
prefix=/aaronwl/cs/internat/iconv/install --with-gmp=/aaronwl/cs/env/mingw-
head-head-head-20040909 --with-mpfr=/aaronwl/cs/env/mingw-head-head-head-
20040913 --with-gcc-version-
trigger=/aaronwl/cs/compilers/gcc/src/cvs/head/gcc/gcc/version.c --enable-
languages=c,ada,c++,f95,java,objc --no-create --no-recursion
Thread model: win32
gcc version 4.0.0 20040914 (experimental)

i686-pc-mingw32
Windows XP SP2 Professional
Pentium 4 256MB
Cygwin Current Tue Sep 07 08:20:57 2004
binutils 2.15
mingwrt 3.5
msvcrt 7.0.2600.2180
w32api 3.1
libiconv 1.9.1

-- 
           Summary: [4.0 regression] Ada does not bootstrap on i686-pc-
                    mingw32
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: ada
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: aaronavay62 at aaronwl dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-mingw32
  GCC host triplet: i686-pc-mingw32
GCC target triplet: i686-pc-mingw32


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17475


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