[Bug target/118941] New: tic6x-elf: "Error: label not at start of execute packet" when building libstdc++ for C++23

[joel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118941

            Bug ID: 118941
           Summary: tic6x-elf: "Error: label not at start of execute
                    packet" when building libstdc++ for C++23
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joel at gcc dot gnu.org
  Target Milestone: ---

Building with binutils-gdb, newlib-cygwin, and gcc
(25256ec1df10f2eb183e1c1ab0c890e9fdd94384) from their respective masters as of
19 February 2025 in one-tree style, a build targeting tic6x-elf fails if C++ is
enabled. When built for just C, gcc reports this as the version:

tic6x-elf-gcc (GCC) 15.0.1 20250219 (experimental)

After enabling C++, failure output is as follows:

libtool: compile:  /home/joel/test-gcc/b-tic6x-elf-gcc/./gcc/xgcc
-shared-libgcc -B/home/joel/test-gcc/b-tic6x-elf-gcc/./gcc -nostdinc++
-L/home/joel/test-gcc/b-tic6x-elf-gcc/tic6x-elf/libstdc++-v3/src
-L/home/joel/test-gcc/b-tic6x-elf-gcc/tic6x-elf/libstdc++-v3/src/.libs
-L/home/joel/test-gcc/b-tic6x-elf-gcc/tic6x-elf/libstdc++-v3/libsupc++/.libs
-nostdinc -B/home/joel/test-gcc/b-tic6x-elf-gcc/tic6x-elf/newlib/ -isystem
/home/joel/test-gcc/b-tic6x-elf-gcc/tic6x-elf/newlib/targ-include -isystem
/home/joel/test-gcc/gcc/newlib/libc/include
-B/home/joel/test-gcc/b-tic6x-elf-gcc/tic6x-elf/libgloss/tic6x
-L/home/joel/test-gcc/b-tic6x-elf-gcc/tic6x-elf/libgloss/libnosys
-L/home/joel/test-gcc/gcc/libgloss/tic6x
-B/home/joel/test-gcc/install-tic6x/tic6x-elf/bin/
-B/home/joel/test-gcc/install-tic6x/tic6x-elf/lib/ -isystem
/home/joel/test-gcc/install-tic6x/tic6x-elf/include -isystem
/home/joel/test-gcc/install-tic6x/tic6x-elf/sys-include
-I/home/joel/test-gcc/gcc/libstdc++-v3/../libgcc
-I/home/joel/test-gcc/b-tic6x-elf-gcc/tic6x-elf/libstdc++-v3/include/tic6x-elf
-I/home/joel/test-gcc/b-tic6x-elf-gcc/tic6x-elf/libstdc++-v3/include
-I/home/joel/test-gcc/gcc/libstdc++-v3/libsupc++ -std=gnu++23
-fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=19
-fdiagnostics-show-location=once -ffunction-sections -fdata-sections
-frandom-seed=stacktrace.lo -fimplicit-templates -g -O2 -c
../../../../../gcc/libstdc++-v3/src/c++23/stacktrace.cc -o stacktrace.o
/tmp/ccZup7Rw.s: Assembler messages:
/tmp/ccZup7Rw.s:44: Error: label not at start of execute packet
/tmp/ccZup7Rw.s:76: Error: label not at start of execute packet
/tmp/ccZup7Rw.s:92: Error: label not at start of execute packet
make[5]: *** [Makefile:599: stacktrace.lo] Error 1

The output from the assembler looks similar to that in 114910
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114910) . This may be another
instance of the same failure. But I have no idea.