[Bug target/33168] [4.3 Regression] GCC Boot failure, building libstc++

["amodra at bigpond dot net dot au" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #11 from amodra at bigpond dot net dot au  2007-09-26 14:27 -------
We first choose a section here, when decl readonly_flag is false:

#0  get_section (name=0x40000cca824 ".data._ZSt15system_category", flags=512, 
    decl=0x40000e44000) at /src/gcc-current/gcc/varasm.c:527
#1  0x000000001067bd70 in get_block_for_decl (decl=0x40000e44000)
    at /src/gcc-current/gcc/varasm.c:1196
#2  0x000000001067c588 in make_decl_rtl (decl=0x40000e44000)
    at /src/gcc-current/gcc/varasm.c:1395
#3  0x000000001067d3d8 in notice_global_symbol (decl=0x40000e44000)
    at /src/gcc-current/gcc/varasm.c:1558
#4  0x00000000106dd04c in varpool_mark_needed_node (node=0x40000f12500)
    at /src/gcc-current/gcc/varpool.c:192
#5  0x00000000106dda78 in varpool_finalize_decl (decl=0x40000e44000)
    at /src/gcc-current/gcc/varpool.c:297
#6  0x0000000010403fac in rest_of_decl_compilation (decl=0x40000e44000, 
    top_level=1, at_end=0) at /src/gcc-current/gcc/passes.c:192
#7  0x000000001002c624 in make_rtl_for_nonlocal_decl (decl=0x40000e44000, 
    init=0x0, asmspec=0x10b4f398 "") at /src/gcc-current/gcc/cp/decl.c:5136
#8  0x000000001003e1ec in cp_finish_decl (decl=0x40000e44000, init=0x0, 
    init_const_expr_p=0 '\0', asmspec_tree=<value optimized out>, flags=8)
    at /src/gcc-current/gcc/cp/decl.c:5511

Note flags=512 is SECTION_WRITE in get_section call.

We set readonly near the end of cp_finish_decl.  This change in the readonly
flag is the cause of later trouble when assemble_variable is called, as
targetm.section_type_flags (called from get_named_section, from
get_variable_section, from assemble_variable) now returns 0.  get_section is
then called with flags=0, triggering the error.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33168