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)));