[Bug fortran/36215] New: [4.4 regression] Fortran bootstrap fails on _abs_c4.F90

["aaronavay62 at aaronwl dot com" <gcc-bugzilla at gcc dot gnu dot org>]

I've had at least three different (but possibly related) problems when trying
to bootstrap Fortran in 4.4 20080510

1) I get a popup message telling me gfortran.exe has crashed in some configure
scripts, which I have not investigated further

2) When compiling _abs_c4.F90, build fails.  Strangely, when using the build
driver, no output is visible, but when f951.exe is invoked directly, the error
message is visible.

/mingw/src/gccsvn/obj/./gcc/gfortran -B/mingw/src/gccsvn/obj/./gcc/
-L/mingw/src/gccsvn/obj/i386-pc-mingw32/winsup/mingw
-L/mingw/src/gccsvn/obj/i386-pc-mingw32/winsup/w32api/lib -isystem
/mingw/src/gccsvn/svn/winsup/mingw/include -isystem
/mingw/src/gccsvn/svn/winsup/w32api/include -B/mingw/i386-pc-mingw32/bin/
-B/mingw/i386-pc-mingw32/lib/ -isystem /mingw/i386-pc-mingw32/include -isystem
/mingw/i386-pc-mingw32/sys-include -DHAVE_CONFIG_H -I.
-I../../../svn/libgfortran -I. -iquote../../../svn/libgfortran/io
-I../../../svn/libgfortran/../gcc -I../../../svn/libgfortran/../gcc/config
-I../.././gcc -D_GNU_SOURCE -I . -Wall -fno-repack-arrays -fno-underscoring
-fallow-leading-underscore -g -O2 -c
../../../svn/libgfortran/generated/_abs_c4.F90  -DDLL_EXPORT -o .libs/_abs_c4.o
-save-temps -v
Reading specs from /mingw/src/gccsvn/obj/./gcc/specs
Target: i386-pc-mingw32
Configured with: ../svn/configure
--enable-languages=c,c++,fortran,java,objc,obj-c++ --disable-sjlj-exceptions
--enable-libgcj --enable-libgomp --with-dwarf2 --disable-win32-registry
--enable-libstdcxx-debug --enable-concept-checks
--enable-version-specific-runtime-libs --prefix=/mingw
--with-gmp=/mingw/src/gcc/gmp-mpfr-root
--with-mpfr=/mingw/src/gcc/gmp-mpfr-root
--with-libiconv-prefix=/mingw/src/gcc/libiconv-root
Thread model: win32
gcc version 4.4.0 20080510 (experimental) (GCC) 
...collect2 and cpp noise omitted...
/mingw/src/gccsvn/obj/./gcc/f951.exe _abs_c4.f95 -ffree-form -quiet -dumpbase
_abs_c4.F90 -mtune=i386 -auxbase-strip .libs/_abs_c4.o -g -O2 -Wall -version
-fno-repack-arrays -fno-underscoring -fallow-leading-underscore -I.
-I../../../svn/libgfortran -I. -I../../../svn/libgfortran/../gcc
-I../../../svn/libgfortran/../gcc/config -I../.././gcc -I . -fpreprocessed
-fintrinsic-modules-path finclude -o _abs_c4.s
GNU Fortran (GCC) version 4.4.0 20080510 (experimental) (i386-pc-mingw32)
        compiled by GNU C version 4.4.0 20080510 (experimental), GMP version
4.2.2, MPFR version 2.3.1.
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Error: Can't open file '_abs_c4.f95'
<built-in>:0: fatal error: can't open input file: _abs_c4.f95
compilation terminated.

However, the output file _abs_c4.f95 is actually there.

3) When I attempted to re-run the above command in GDB, I got a crash in
malloc:

Program received signal SIGSEGV, Segmentation fault.
0x7c91b3fb in wcsncat () from C:\WINDOWS\system32\ntdll.dll

(The above message is incorrect due to GDB limitations)

#0  xmalloc (size=54) at ../../svn/libiberty/xmalloc.c:147
#1  0x00440ea8 in gfc_getmem (n=54) at ../../svn/gcc/fortran/misc.c:37
#2  0x0045ed50 in gfc_widechar_to_char (s=0x282a788, length=-1)
    at ../../svn/gcc/fortran/scanner.c:198
#3  0x0046058a in preprocessor_line (c=0x282ab4c)
    at ../../svn/gcc/fortran/scanner.c:1606
#4  0x00460870 in load_file (
    filename=0x282aa00 "../../../svn/libgfortran/generated/_abs_c4.F90", 
    initial=1 '\001') at ../../svn/gcc/fortran/scanner.c:1800
#5  0x00460dd9 in gfc_new_file () at ../../svn/gcc/fortran/scanner.c:1912
#6  0x004768e2 in gfc_init () at ../../svn/gcc/fortran/f95-lang.c:288
#7  0x00527e16 in toplev_main (argc=29, argv=0x3d4518)
    at ../../svn/gcc/toplev.c:2039
#8  0x004bfa09 in main (argc=) at ../../svn/gcc/main.c:35

So, it looks like there is some sort of heap corruption.

I'm going to look at this more after I've resolved some other issues, and I'm
going to re-bootstrap with more conservative options to see if that helps.


-- 
           Summary: [4.4 regression] Fortran bootstrap fails on _abs_c4.F90
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: build
          Severity: major
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: aaronavay62 at aaronwl dot com
  GCC host triplet: i386-pc-mingw32
GCC target triplet: i386-pc-mingw32


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36215