https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71574
Bug ID: 71574
Summary: ICE on code with alloc_align attribute on
x86_64-linux-gnu: in default_conversion, at
c/c-typeck.c:2126
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The following code causes an ICE when compiled with the current gcc trunk on
x86_64-linux-gnu in both 32-bit and 64-bit modes.
It ICEs all GCC versions 5.x and later.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160617 (experimental) [trunk revision 237557] (GCC)
$
$ gcc-trunk -c small.c
small.c:2:1: internal compiler error: in default_conversion, at
c/c-typeck.c:2118
int fn2 () __attribute__ ((alloc_align (fn1)));
^~~
0x66b0dd default_conversion(tree_node*)
../../gcc-source-trunk/gcc/c/c-typeck.c:2118
0x6d4cf0 handle_alloc_align_attribute
../../gcc-source-trunk/gcc/c-family/c-common.c:8365
0x641441 decl_attributes(tree_node**, tree_node*, int)
../../gcc-source-trunk/gcc/attribs.c:551
0x65991a start_decl(c_declarator*, c_declspecs*, bool, tree_node*)
../../gcc-source-trunk/gcc/c/c-decl.c:4545
0x6bdff5 c_parser_declaration_or_fndef
../../gcc-source-trunk/gcc/c/c-parser.c:1963
0x6c7f95 c_parser_external_declaration
../../gcc-source-trunk/gcc/c/c-parser.c:1549
0x6c8829 c_parser_translation_unit
../../gcc-source-trunk/gcc/c/c-parser.c:1430
0x6c8829 c_parse_file()
../../gcc-source-trunk/gcc/c/c-parser.c:17930
0x72b1b2 c_common_parse_file()
../../gcc-source-trunk/gcc/c-family/c-opts.c:1070
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$
-------------------------------------------------
int fn1 ();
int fn2 () __attribute__ ((alloc_align (fn1)));
