This is Debian bug #408703; see the attached files that reproduce
the problem. The command line is
gnatmake integer_indexed_io-debug.ads
After successfully compiling a couple of files, gnat1 then goes into
an infinite loop while parsing integer_indexed_io-debug.ads. The
backtrace I got when running "gnat1 integer_indexed_io-debug.ads"
under gdb and hitting Ctrl+C says:
#1 0x00000000005b0cc0 in sem_ch8.end_use_clauses ()
#2 0x00000000005b0e4d in sem_ch8.pop_scope ()
#3 0x0000000000560b4a in sem_ch10.remove_parents ()
#4 0x0000000000560c19 in sem_ch10.remove_context ()
#5 0x00000000005664f2 in sem_ch10.analyze_compilation_unit ()
#6 0x000000000054b4ac in sem.analyze ()
#7 0x000000000054b829 in sem.semantics.do_analyze ()
#8 0x000000000054ba66 in sem.semantics ()
#9 0x00000000004f1a30 in frontend ()
#10 0x000000000062bac6 in gnat1drv ()
#11 0x0000000000412dad in gnat_parse_file ()
#12 0x0000000000870138 in toplev_main ()
#13 0x00002ade5132c4ca in __libc_start_main () from /lib/libc.so.6
#14 0x0000000000402f0a in _start () at ../sysdeps/x86_64/elf/start.S:113
If you stop gnat1 at various times, the topmost frame (#0)
varies, but after executing the statements until you return to
sem_ch8.end_use_clauses and type n, the infinite loop resumes.
Memory usage remains constant in the infinite loop.
--
Ludovic Brenta.
--
Summary: Infinite loop in sem_ch8.end_use_clauses
Product: gcc
Version: 4.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ada
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ludovic at ludovic-brenta dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30618
