GNU gdb (Gentoo 9.1 vanilla) 9.1
[trimmer]

Reading symbols from x86_64-pc-linux-gnu-g++...

Breakpoint 1 at 0x432a60: file /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/diagnostic.c, line 1706.
[removed failed break attempts]
(gdb) b /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/cp-gimplify.c:667
No source file named /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/cp-gimplify.c.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 2 (/var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/cp-gimplify.c:667) pending.
(gdb) b cp_gimplify_expr
Function "cp_gimplify_expr" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 3 (cp_gimplify_expr) pending.
(gdb) r
Starting program: /usr/bin/x86_64-pc-linux-gnu-g++ -fvisibility-inlines-hidden -Os -pipe -fomit-frame-pointer -std=c++14 -fPIC -m64 -pthread -finline-functions -Wno-inline -Wall -fvisibility=hidden -DBOOST_ALL_DYN_LINK=1 -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I. -c -o instantiate_predef_macros.o instantiate_predef_macros.ii
[Attaching after process 20099 vfork to child process 20103]
[New inferior 2 (process 20103)]
[Detaching vfork parent process 20099 after child exec]
[Inferior 1 (process 20099) detached]
process 20103 is executing new program: /usr/libexec/gcc/x86_64-pc-linux-gnu/10.1.0/cc1plus
[Switching to process 20103]

Thread 2.1 "cc1plus" hit Breakpoint 2, cp_gimplify_expr (expr_p=0x7fffef78d6c0, pre_p=0x7fffffffd1d8, post_p=0x7fffffffd0c8)
    at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/cp-gimplify.c:668
668     {
(gdb) bt
#0  cp_gimplify_expr (expr_p=0x7fffef78d6c0, pre_p=0x7fffffffd1d8, post_p=0x7fffffffd0c8) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/cp-gimplify.c:668
#1  0x00000000009f49fc in gimplify_expr (expr_p=0x7fffef78d6c0, pre_p=<optimized out>, post_p=<optimized out>, gimple_test_f=<optimized out>, fallback=<optimized out>)
    at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/gimplify.c:13516
#2  0x00000000009f98d9 in gimplify_stmt (seq_p=0x7fffffffd1d8, stmt_p=0x7fffef78d6c0) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/gimplify.c:6825
#3  gimplify_body (fndecl=0x7fffef78d600, do_parms=<optimized out>) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/gimplify.c:14857
#4  0x00000000009f9d16 in gimplify_function_tree (fndecl=fndecl@entry=0x7fffef78d600) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/gimplify.c:15030
#5  0x0000000000885968 in cgraph_node::analyze (this=0x7fffef790438) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cgraphunit.c:670
#6  0x0000000000888288 in analyze_functions (first_time=<optimized out>) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cgraphunit.c:1227
#7  0x0000000000888ed3 in symbol_table::finalize_compilation_unit (this=0x7ffff7950100) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cgraphunit.c:2974
#8  0x0000000000c76321 in compile_file () at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/toplev.c:483
#9  0x00000000006005e5 in do_compile () at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/toplev.c:2277
#10 toplev::main (this=this@entry=0x7fffffffd4c6, argc=<optimized out>, argc@entry=22, argv=<optimized out>, argv@entry=0x7fffffffd5c8)
    at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/toplev.c:2416
#11 0x00000000006040cc in main (argc=22, argv=0x7fffffffd5c8) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/main.c:39
(gdb) frame 0
#0  cp_gimplify_expr (expr_p=0x7fffef78d6c0, pre_p=0x7fffffffd1d8, post_p=0x7fffffffd0c8) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/cp-gimplify.c:668
668     {
(gdb) disassemble
Dump of assembler code for function cp_gimplify_expr(tree_node**, gimple**, gimple**):
Address range 0x6595b0 to 0x65a282:
=> 0x00000000006595b0 <+0>:     push   %r15
   0x00000000006595b2 <+2>:     push   %r14
   0x00000000006595b4 <+4>:     mov    %rdi,%r14
   0x00000000006595b7 <+7>:     push   %r13
   0x00000000006595b9 <+9>:     push   %r12
   0x00000000006595bb <+11>:    push   %rbp
   0x00000000006595bc <+12>:    push   %rbx
   0x00000000006595bd <+13>:    mov    %rsi,%rbp
   0x00000000006595c0 <+16>:    sub    $0x88,%rsp
   0x00000000006595c7 <+23>:    mov    (%rdi),%rdi
   0x00000000006595ca <+26>:    mov    0x326c928(%rip),%ebx        # 0x38c5ef8 <input_location>
   0x00000000006595d0 <+32>:    mov    %rdx,0x10(%rsp)
   0x00000000006595d5 <+37>:    mov    %fs:0x28,%rax
   0x00000000006595de <+46>:    mov    %rax,0x78(%rsp)
   0x00000000006595e3 <+51>:    xor    %eax,%eax
   0x00000000006595e5 <+53>:    callq  0x77b0d0 <cp_expr_location(tree_node const*)>
   0x00000000006595ea <+58>:    movl   $0x0,0xc(%rsp)
   0x00000000006595f2 <+66>:    test   %eax,%eax
   0x00000000006595f4 <+68>:    mov    %eax,%r11d
   0x00000000006595f7 <+71>:    mov    (%r14),%rax
   0x00000000006595fa <+74>:    cmove  %ebx,%r11d
   0x00000000006595fe <+78>:    movzwl (%rax),%r15d
   0x0000000000659602 <+82>:    movzwl %r15w,%ebx
   0x0000000000659606 <+86>:    mov    %r15d,%r12d
   0x0000000000659609 <+89>:    cmpb   $0x0,0x208eea0(%rbx)
   0x0000000000659610 <+96>:    jne    0x6598b0 <cp_gimplify_expr(tree_node**, gimple**, gimple**)+768>
   0x0000000000659616 <+102>:   cmp    $0x134,%r12w
   0x000000000065961c <+108>:   ja     0x65967c <cp_gimplify_expr(tree_node**, gimple**, gimple**)+204>
   0x000000000065961e <+110>:   cmp    $0xfd,%r12w
   0x0000000000659624 <+116>:   jbe    0x659650 <cp_gimplify_expr(tree_node**, gimple**, gimple**)+160>
   0x0000000000659626 <+118>:   lea    -0xfe(%r12),%r9d
   0x000000000065962e <+126>:   cmp    $0x36,%r9w
   0x0000000000659633 <+131>:   ja     0x65967c <cp_gimplify_expr(tree_node**, gimple**, gimple**)+204>
   0x0000000000659635 <+133>:   movzwl %r9w,%r9d
   0x0000000000659639 <+137>:   jmpq   *0x1639220(,%r9,8)
   0x0000000000659641 <+145>:   data16 nopw %cs:0x0(%rax,%rax,1)
   0x000000000065964c <+156>:   nopl   0x0(%rax)
   0x0000000000659650 <+160>:   cmp    $0x42,%r12w
   0x0000000000659655 <+165>:   je     0x659d40 <cp_gimplify_expr(tree_node**, gimple**, gimple**)+1936>
   0x000000000065965b <+171>:   jbe    0x659730 <cp_gimplify_expr(tree_node**, gimple**, gimple**)+384>
   0x0000000000659661 <+177>:   cmp    $0x92,%r12w
   0x0000000000659667 <+183>:   je     0x659d10 <cp_gimplify_expr(tree_node**, gimple**, gimple**)+1888>
   0x000000000065966d <+189>:   lea    -0xac(%r12),%r9d
   0x0000000000659675 <+197>:   cmp    $0x4,%r9w
--Type <RET> for more, q to quit, c to continue without paging--q
Quit
(gdb) b *0x00000000006595e3
Breakpoint 4 at 0x6595e3: file /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/cp-gimplify.c, line 668.
(gdb) c
Continuing.

Thread 2.1 "cc1plus" hit Breakpoint 4, 0x00000000006595e3 in cp_gimplify_expr (expr_p=0x7fffef78d6c0, pre_p=0x7fffffffd1d8, post_p=0x7fffffffd0c8)
    at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/cp-gimplify.c:668
668     {
(gdb) watch *(long*)($rsp+78)
Watchpoint 5: *(long*)($rsp+78)
(gdb) c
Continuing.

Thread 2.1 "cc1plus" hit Watchpoint 5: *(long*)($rsp+78)

Old value = 4373616787456
New value = 196608
cp_expr_location (t_=0x7fffef10d030) at /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/tree.c:5746
5746      if (t == NULL_TREE)
(gdb) list
5741
5742    location_t
5743    cp_expr_location (const_tree t_)
5744    {
5745      tree t = CONST_CAST_TREE (t_);
5746      if (t == NULL_TREE)
5747        return UNKNOWN_LOCATION;
5748      switch (TREE_CODE (t))
5749        {
5750        case LAMBDA_EXPR:
(gdb) disassemble /s
Dump of assembler code for function cp_expr_location(tree_node const*):
/var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/gcc/cp/tree.c:
5744    {
5745      tree t = CONST_CAST_TREE (t_);
5746      if (t == NULL_TREE)
=> 0x000000000077b0d0 <+0>:     test   %rdi,%rdi
   0x000000000077b0d3 <+3>:     je     0x77b100 <cp_expr_location(tree_node const*)+48>

5747        return UNKNOWN_LOCATION;
5748      switch (TREE_CODE (t))
   0x000000000077b0d5 <+5>:     movzwl (%rdi),%eax
   0x000000000077b0d8 <+8>:     cmp    $0x13f,%ax
   0x000000000077b0dc <+12>:    je     0x77b110 <cp_expr_location(tree_node const*)+64>
   0x000000000077b0de <+14>:    cmp    $0x140,%ax
   0x000000000077b0e2 <+18>:    je     0x77b120 <cp_expr_location(tree_node const*)+80>
   0x000000000077b0e4 <+20>:    cmp    $0x135,%ax
   0x000000000077b0e8 <+24>:    je     0x77b110 <cp_expr_location(tree_node const*)+64>

5756        default:
5757          return EXPR_LOCATION (t);
   0x000000000077b0ea <+26>:    mov    0x175c280(,%rax,4),%edx
   0x000000000077b0f1 <+33>:    xor    %eax,%eax
   0x000000000077b0f3 <+35>:    sub    $0x4,%edx
   0x000000000077b0f6 <+38>:    cmp    $0x6,%edx
   0x000000000077b0f9 <+41>:    ja     0x77b102 <cp_expr_location(tree_node const*)+50>
   0x000000000077b0fb <+43>:    mov    0x10(%rdi),%eax
   0x000000000077b0fe <+46>:    retq   
   0x000000000077b0ff <+47>:    nop
   0x000000000077b100 <+48>:    xor    %eax,%eax
   0x000000000077b102 <+50>:    retq   
   0x000000000077b103 <+51>:    data16 nopw %cs:0x0(%rax,%rax,1)
   0x000000000077b10e <+62>:    xchg   %ax,%ax

5755          return TRAIT_EXPR_LOCATION (t);
   0x000000000077b110 <+64>:    mov    0x28(%rdi),%eax
   0x000000000077b113 <+67>:    retq   
   0x000000000077b114 <+68>:    data16 nopw %cs:0x0(%rax,%rax,1)
   0x000000000077b11f <+79>:    nop

5751          return LAMBDA_EXPR_LOCATION (t);
   0x000000000077b120 <+80>:    mov    0x30(%rdi),%eax
   0x000000000077b123 <+83>:    retq   
End of assembler dump.