[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #9 from Ian Lance Taylor --- Thanks very much for taking the time to narrow down the test case. That is nice and simple.
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #10 from Ian Lance Taylor --- FYI, refiled as https://golang.org/issue/13344 and sent out https://golang.org/cl/17151 , a variant of the patch you suggested.
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #11 from ian at gcc dot gnu.org --- Author: ian Date: Fri Nov 20 22:48:47 2015 New Revision: 230685 URL: https://gcc.gnu.org/viewcvs?rev=230685=gcc=rev Log: PR go/68072 cmd/cgo: ignore vars with no name or type if they have a AttrSpecification Backport of master CL https://golang.org/cl/17151. Fixes https://gcc.gnu.org/PR/68072. Reviewed-on: https://go-review.googlesource.com/17152 Modified: trunk/gcc/go/gofrontend/MERGE trunk/libgo/go/cmd/cgo/gcc.go
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #12 from ian at gcc dot gnu.org --- Author: ian Date: Fri Nov 20 22:49:06 2015 New Revision: 230686 URL: https://gcc.gnu.org/viewcvs?rev=230686=gcc=rev Log: PR go/68072 cmd/cgo: ignore vars with no name or type if they have a AttrSpecification Backport of master CL https://golang.org/cl/17151. Fixes https://gcc.gnu.org/PR/68072. Reviewed-on: https://go-review.googlesource.com/17152 Modified: branches/gcc-5-branch/libgo/go/cmd/cgo/gcc.go
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 Ian Lance Taylor changed: What|Removed |Added Status|ASSIGNED|RESOLVED Resolution|--- |FIXED --- Comment #13 from Ian Lance Taylor --- Should be fixed on mainline and GCc 5 branch.
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #8 from Dominik Vogt --- Created attachment 36750 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36750=edit Test case This is the requested minimal test program.
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #7 from Dominik Vogt --- All right, I'll try to extract a minimal test case.
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 Ian Lance Taylor changed: What|Removed |Added Status|UNCONFIRMED |ASSIGNED Last reconfirmed||2015-11-11 Ever confirmed|0 |1 --- Comment #6 from Ian Lance Taylor --- The patch seems plausible but we'll need a test case, even if that test case only fails with current GCC. It looks like the GCC change might be due to the early-debug work. It looks like it should be pretty easy to boil down the test case into a small piece of code that fails.
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #5 from Dominik Vogt --- Any opinions on the patch in comment 3?
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #2 from Ian Lance Taylor --- This is not a known bug. I wonder what is special about this package that it causes it to happen? I don't see anything new in GCC related to DW_AT_specification. I think the place to fix in the Go sources would be cmd/cgo/gcc.go.
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #3 from Dominik Vogt --- Created attachment 36588 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36588=edit Experimental fix The attached patch fixes the problem for us by skipping DW_TAG_variable DWARF info that only contains a DW_AT_specification (no DW_AT_type and DW_AT_name), assuming that they are just duplicate declarations/definitions.
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #4 from Dominik Vogt --- @comment 2 I can't see anything special that the file does: -- secp256.go -- package secp256k1 /* #cgo CFLAGS: -I./secp256k1 ... #include "./secp256k1/src/secp256k1.c" */ import "C" -- END -- Then in -- secp256k1.c -- const secp256k1_nonce_function_t secp256k1_nonce_function_rfc6979 = nonce_function_rfc6979; -- END -- Just this one occurence of the symbol "secp256k1_nonce_function_rfc6979".
[Bug go/68072] malformed DWARF TagVariable entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68072 --- Comment #1 from Dominik Vogt --- It seems that the DWARF library is unable to handle DW_AT_specification: -- snip -- <1><7b4>: Abbrev Number: 27 (DW_TAG_variable) <7b5> DW_AT_specification: <0x8b> <7b9> DW_AT_decl_file : 13 <7ba> DW_AT_decl_line : 77 <7bb> DW_AT_location: 9 byte block: 3 0 0 0 0 0 0 4 80 (DW_OP_addr: 480) <1><8b>: Abbrev Number: 10 (DW_TAG_variable) <8c> DW_AT_name: (indirect string, offset: 0x3c4): secp256k1_nonce_function_rfc6979 <90> DW_AT_decl_file : 14 <91> DW_AT_decl_line : 104 <92> DW_AT_type: <0x98> <96> DW_AT_external: 1 <97> DW_AT_declaration : 1 -- snip -- DW_AT_name and DW_AT_type are provided by the DW_TAG_variable that the DW_AT_specification attribute is pointing to. Is that a known problem; ist there already a fix? Otherwise I can try to make a patch.
