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2021-10-25binutils, ld: make objdump --ctf's parameter optionalNick Alcock1-1/+1
ld by default (and always, unless adjusted with a hand-rolled linker script) emits deduplicated CTF into the .ctf section. But viewing it needs you to explicitly tell objdump this: it doesn't default its argument, even though what you always end up typing is --ctf=.ctf. This is annoying, so make the argument optional. binutils/ChangeLog 2021-10-25 Nick Alcock <nick.alcock@oracle.com> * objdump.c (usage): --ctf now has an optional argument. (main): Adjust accordingly. (dump_ctf): Default it. * doc/ctf.options.texi: Adjust. ld/ChangeLog 2021-10-25 Nick Alcock <nick.alcock@oracle.com> * testsuite/ld-ctf/array.d: Change --ctf=.ctf to --ctf. * testsuite/ld-ctf/conflicting-cycle-1.B-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-1.B-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-1.parent.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.A-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.A-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.parent.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.C-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.C-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.parent.d: Likewise. * testsuite/ld-ctf/conflicting-enums.d: Likewise. * testsuite/ld-ctf/conflicting-typedefs.d: Likewise. * testsuite/ld-ctf/cross-tu-cyclic-conflicting.d: Likewise. * testsuite/ld-ctf/cross-tu-cyclic-nonconflicting.d: Likewise. * testsuite/ld-ctf/cross-tu-into-cycle.d: Likewise. * testsuite/ld-ctf/cross-tu-noncyclic.d: Likewise. * testsuite/ld-ctf/cycle-1.d: Likewise. * testsuite/ld-ctf/cycle-2.A.d: Likewise. * testsuite/ld-ctf/cycle-2.B.d: Likewise. * testsuite/ld-ctf/cycle-2.C.d: Likewise. * testsuite/ld-ctf/data-func-conflicted.d: Likewise. * testsuite/ld-ctf/diag-cttname-null.d: Likewise. * testsuite/ld-ctf/diag-cuname.d: Likewise. * testsuite/ld-ctf/diag-parlabel.d: Likewise. * testsuite/ld-ctf/enum-forward.d: Likewise. * testsuite/ld-ctf/enums.d: Likewise. * testsuite/ld-ctf/forward.d: Likewise. * testsuite/ld-ctf/function.d: Likewise. * testsuite/ld-ctf/nonrepresentable.d: Likewise. * testsuite/ld-ctf/slice.d: Likewise. * testsuite/ld-ctf/super-sub-cycles.d: Likewise.
2021-01-05libctf, ld: dump enums: generally improve dump formattingNick Alcock1-6/+5
This commit adds dumping of enumerands in this general form: 0x3: (kind 8) enum eleven_els (size 0x4) (aligned at 0x4) ELEVEN_ONE: 10 ELEVEN_TWO: 11 ELEVEN_THREE: -256 ELEVEN_FOUR: -255 ELEVEN_FIVE: -254 ... ELEVEN_SEVEN: -252 ELEVEN_EIGHT: -251 ELEVEN_NINE: -250 ELEVEN_TEN: -249 ELEVEN_ELEVEN: -248 The first and last enumerands in the enumerated type are printed so that you can tell if they've been cut off at one end or the other. (For now, there is no way to control how many enumerands are printed.) The dump output in general is improved, from this sort of thing a few days ago: 4c: char [0x0:0x8] (size 0x1) [0x0] (ID 0x4c) (kind 1) char:8 (aligned at 0x1, format 0x3, offset:bits 0x0:0x8) 4d: char * (size 0x8) -> 4c: char [0x0:0x8] (size 0x1) [0x0] (ID 0x4d) (kind 3) char * (aligned at 0x8) [...] 5a: struct _IO_FILE (size 0xd8) [0x0] (ID 0x5a) (kind 6) struct _IO_FILE (aligned at 0x4) [0x0] (ID 0x3) (kind 1) int _flags:32 (aligned at 0x4, format 0x1, offset:bits 0x0:0x20) [0x40] (ID 0x4d) (kind 3) char * _IO_read_ptr (aligned at 0x8) [0x80] (ID 0x4d) (kind 3) char * _IO_read_end (aligned at 0x8) [0xc0] (ID 0x4d) (kind 3) char * _IO_read_base (aligned at 0x8) 5b: __FILE (size 0xd8) -> 5a: struct _IO_FILE (size 0xd8) [0x0] (ID 0x5b) (kind 10) __FILE (aligned at 0x4) [0x0] (ID 0x3) (kind 1) int _flags:32 (aligned at 0x4, format 0x1, offset:bits 0x0:0x20) [0x40] (ID 0x4d) (kind 3) char * _IO_read_ptr (aligned at 0x8) [0x80] (ID 0x4d) (kind 3) char * _IO_read_end (aligned at 0x8) [0xc0] (ID 0x4d) (kind 3) char * _IO_read_base (aligned at 0x8) [...] 406: struct coff_link_hash_entry (size 0x60) [0x0] (ID 0x406) (kind 6) struct coff_link_hash_entry (aligned at 0x8) [0x0] (ID 0x2b3) (kind 6) struct bfd_link_hash_entry root (aligned at 0x8) [0x0] (ID 0x1d6) (kind 6) struct bfd_hash_entry root (aligned at 0x8) [0x0] (ID 0x1d7) (kind 3) struct bfd_hash_entry * next (aligned at 0x8) [0x40] (ID 0x61) (kind 3) const char * string (aligned at 0x8) [0x80] (ID 0x1) (kind 1) long unsigned int hash:64 (aligned at 0x8, format 0x0, offset:bits 0x0:0x40) [0xc0] (ID 0x397) (kind 8) enum bfd_link_hash_type type:8 (aligned at 0x1, format 0x0, offset:bits 0x0:0x8) [0xc8] (ID 0x1c7) (kind 1) unsigned int non_ir_ref_regular:1 (aligned at 0x1, format 0x0, offset:bits 0x8:0x1) [0xc9] (ID 0x1c8) (kind 1) unsigned int non_ir_ref_dynamic:1 (aligned at 0x1, format 0x0, offset:bits 0x9:0x1) [0xca] (ID 0x1c9) (kind 1) unsigned int linker_def:1 (aligned at 0x1, format 0x0, offset:bits 0xa:0x1) [0xcb] (ID 0x1ca) (kind 1) unsigned int ldscript_def:1 (aligned at 0x1, format 0x0, offset:bits 0xb:0x1) [0xcc] (ID 0x1cb) (kind 1) unsigned int rel_from_abs:1 (aligned at 0x1, format 0x0, offset:bits 0xc:0x1) ... to this: 0x4c: (kind 1) char (format 0x3) (size 0x1) (aligned at 0x1) 0x4d: (kind 3) char * (size 0x8) (aligned at 0x8) -> 0x4c: (kind 1) char (format 0x3) (size 0x1) (aligned at 0x1) 0x5a: (kind 6) struct _IO_FILE (size 0xd8) (aligned at 0x4) [0x0] _flags: ID 0x3: (kind 1) int (format 0x1) (size 0x4) (aligned at 0x4) [0x40] _IO_read_ptr: ID 0x4d: (kind 3) char * (size 0x8) (aligned at 0x8) [0x80] _IO_read_end: ID 0x4d: (kind 3) char * (size 0x8) (aligned at 0x8) [0xc0] _IO_read_base: ID 0x4d: (kind 3) char * (size 0x8) (aligned at 0x8) [0x100] _IO_write_base: ID 0x4d: (kind 3) char * (size 0x8) (aligned at 0x8) 0x5b: (kind 10) __FILE (size 0xd8) (aligned at 0x4) -> 0x5a: (kind 6) struct _IO_FILE (size 0xd8) (aligned at 0x4) [...] 0x406: (kind 6) struct coff_link_hash_entry (size 0x60) (aligned at 0x8) [0x0] root: ID 0x2b3: (kind 6) struct bfd_link_hash_entry (size 0x38) (aligned at 0x8) [0x0] root: ID 0x1d6: (kind 6) struct bfd_hash_entry (size 0x18) (aligned at 0x8) [0x0] next: ID 0x1d7: (kind 3) struct bfd_hash_entry * (size 0x8) (aligned at 0x8) [0x40] string: ID 0x61: (kind 3) const char * (size 0x8) (aligned at 0x8) [0x80] hash: ID 0x1: (kind 1) long unsigned int (format 0x0) (size 0x8) (aligned at 0x8) [0xc0] type: ID 0x397: (kind 8) enum bfd_link_hash_type (format 0x7f2e) (size 0x1) (aligned at 0x1) [0xc8] non_ir_ref_regular: ID 0x1c7: (kind 1) unsigned int:1 [slice 0x8:0x1] (format 0x0) (size 0x1) (aligned at 0x1) [0xc9] non_ir_ref_dynamic: ID 0x1c8: (kind 1) unsigned int:1 [slice 0x9:0x1] (format 0x0) (size 0x1) (aligned at 0x1) [0xca] linker_def: ID 0x1c9: (kind 1) unsigned int:1 [slice 0xa:0x1] (format 0x0) (size 0x1) (aligned at 0x1) [0xcb] ldscript_def: ID 0x1ca: (kind 1) unsigned int:1 [slice 0xb:0x1] (format 0x0) (size 0x1) (aligned at 0x1) [0xcc] rel_from_abs: ID 0x1cb: (kind 1) unsigned int:1 [slice 0xc:0x1] (format 0x0) (size 0x1) (aligned at 0x1) [...] In particular, indented subsections are only present for actual structs and unions, not forwards to them, and the structure itself doesn't add a spurious level of indentation; structure field names are easier to spot (at the cost of not making them look so much like C field declarations any more, but they weren't always shown in valid decl syntax even before this change) the size, type kind, and alignment are shown for all types for which they are meaningful; bitfield info is only shown for actual bitfields within structures and not ordinary integral fields; and type IDs are never omitted. Type printing is in general much more consistent and there is much less duplicated code in the type dumper. There is one user-visible effect outside the dumper: ctf_type_(a)name was erroneously emitting a trailing space on the name of slice types, even though a slice of an int and an int with the corresponding encoding represent the same type and should have the same print form. This trailing space is now gone. ld/ChangeLog 2021-01-05 Nick Alcock <nick.alcock@oracle.com> * testsuite/ld-ctf/array.d: Adjust for dumper changes. * testsuite/ld-ctf/conflicting-cycle-1.B-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-1.B-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-1.parent.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.A-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.A-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.parent.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.C-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.C-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.parent.d: Likewise. * testsuite/ld-ctf/conflicting-enums.d: Likewise. * testsuite/ld-ctf/conflicting-typedefs.d: Likewise. * testsuite/ld-ctf/cross-tu-cyclic-conflicting.d: Likewise. * testsuite/ld-ctf/cross-tu-cyclic-nonconflicting.d: Likewise. * testsuite/ld-ctf/cross-tu-into-cycle.d: Likewise. * testsuite/ld-ctf/cross-tu-noncyclic.d: Likewise. * testsuite/ld-ctf/cycle-1.d: Likewise. * testsuite/ld-ctf/cycle-2.A.d: Likewise. * testsuite/ld-ctf/cycle-2.B.d: Likewise. * testsuite/ld-ctf/cycle-2.C.d: Likewise. * testsuite/ld-ctf/data-func-conflicted.d: Likewise. * testsuite/ld-ctf/diag-cttname-null.d: Likewise. * testsuite/ld-ctf/diag-cuname.d: Likewise. * testsuite/ld-ctf/diag-parlabel.d: Likewise. * testsuite/ld-ctf/diag-wrong-magic-number-mixed.d: Likewise. * testsuite/ld-ctf/forward.d: Likewise. * testsuite/ld-ctf/function.d: Likewise. * testsuite/ld-ctf/slice.d: Likewise. * testsuite/ld-ctf/super-sub-cycles.d: Likewise. * testsuite/ld-ctf/enums.c: New test. * testsuite/ld-ctf/enums.d: New test. libctf/ChangeLog 2021-01-05 Nick Alcock <nick.alcock@oracle.com> * ctf-decl.c (ctf_decl_push): Exclude slices from the decl stack. * ctf-types.c (ctf_type_aname): No longer deal with slices here. * ctf-dump.c (ctf_dump_membstate_t) <cdm_toplevel_indent>: Constify. (CTF_FT_REFS): New. (CTF_FT_BITFIELD): Likewise. (CTF_FT_ID): Likewise. (ctf_dump_member): Do not do indentation here. Migrate the type-printing parts of this into... (ctf_dump_format_type): ... here, to be shared by all type printers. Get the errno value for non-representable types right. Do not print bitfield info for non-bitfields. Improve the format and indentation of other type output. Shuffle spacing around to make all indentation either 'width of column' or 4 chars. (ctf_dump_label): Pass CTF_FT_REFS to ctf_dump_format_type. (ctf_dump_objts): Likewise. Spacing shuffle. (ctf_dump_var): Likewise. (type_hex_digits): Migrate down in the file, to above its new user. (ctf_dump_type): Indent here instead. Pass CTF_FT_REFS to ctf_dump_format_type. Don't trim off excess linefeeds now we no longer generate them. Dump enumerated types.
2021-01-05libctf, ld: CTF dumper changes for consistencyNick Alcock1-7/+7
In most places in CTF dumper output, we emit 0x... for hex strings, but in three places (top-level type IDs, string table offsets, and the file magic number) we don't emit the 0x. This is very confusing if by chance there are no hex digits in the output. Add 0x consistently to everything, and adjust tests accordingly. While we're at it, improve the indentation of the output so that subsequent lines in aggregate output are indented by at least as many columns as the colon in the type output. (Subsequent indentation is still 4 spaces at a time.) ld/ChangeLog 2021-01-05 Nick Alcock <nick.alcock@oracle.com> * testsuite/ld-ctf/array.d: Adjust for dumper changes. * testsuite/ld-ctf/conflicting-cycle-1.B-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-1.B-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-1.parent.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.A-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.A-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.parent.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.C-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.C-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.parent.d: Likewise. * testsuite/ld-ctf/conflicting-enums.d: Likewise. * testsuite/ld-ctf/conflicting-typedefs.d: Likewise. * testsuite/ld-ctf/cross-tu-cyclic-conflicting.d: Likewise. * testsuite/ld-ctf/cross-tu-cyclic-nonconflicting.d: Likewise. * testsuite/ld-ctf/cross-tu-into-cycle.d: Likewise. * testsuite/ld-ctf/cross-tu-noncyclic.d: Likewise. * testsuite/ld-ctf/cycle-1.d: Likewise. * testsuite/ld-ctf/cycle-2.A.d: Likewise. * testsuite/ld-ctf/cycle-2.B.d: Likewise. * testsuite/ld-ctf/cycle-2.C.d: Likewise. * testsuite/ld-ctf/data-func-conflicted.d: Likewise. * testsuite/ld-ctf/diag-cttname-null.d: Likewise. * testsuite/ld-ctf/diag-cuname.d: Likewise. * testsuite/ld-ctf/diag-parlabel.d: Likewise. * testsuite/ld-ctf/diag-wrong-magic-number-mixed.d: Likewise. * testsuite/ld-ctf/function.d: Likewise. * testsuite/ld-ctf/slice.d: Likewise. * testsuite/ld-ctf/super-sub-cycles.d: Likewise. libctf/ChangeLog 2021-01-05 Nick Alcock <nick.alcock@oracle.com> * ctf-dump.c (ctf_dump_format_type): Add 0x to hex type IDs. (ctf_dump_header): Add 0x to the hex magic number. (ctf_dump_str): Add 0x to the hex string offsets. (ctf_dump_membstate_t) <cdm_toplevel_indent>: New. (ctf_dump_type): Adjust. Free it when we're done. (type_hex_digits): New. (ctf_dump_member): Align output depending on the width of the type ID being generated. Use printf padding, not a loop, to generate indentation.
2020-11-20ld, ctf: new and adjusted CTF tests due to func info / object data sectionsNick Alcock1-3/+3
The flags word is nonzero now (so all the tests have been adjusted to not depend on its content): some of them have data objects and functions in the data object and function info sections now, rather than in the variable section or recorded nowhere. There is a new test for parent/child relationships and index section emission. ld/ChangeLog 2020-11-20 Nick Alcock <nick.alcock@oracle.com> * testsuite/ld-ctf/array.d: Adjust for nonzero flags word and public symbols in the data section rather than variables: use sysv hash style to keep test results the same on non-GNU targets. * testsuite/ld-ctf/diag-cttname-null.d: Likewise. * testsuite/ld-ctf/diag-cuname.d: Likewise. * testsuite/ld-ctf/diag-parlabel.d: Likewise. * testsuite/ld-ctf/slice.d: Likewise. * testsuite/ld-ctf/function.d: Likewise, but in the function section. * testsuite/ld-ctf/conflicting-cycle-1.B-1.d: Adjust for nonzero flags word. * testsuite/ld-ctf/conflicting-cycle-1.B-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-1.parent.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.A-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.A-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-2.parent.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.C-1.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.C-2.d: Likewise. * testsuite/ld-ctf/conflicting-cycle-3.parent.d: Likewise. * testsuite/ld-ctf/cross-tu-noncyclic.d: Likewise. * testsuite/ld-ctf/cycle-1.d: Likewise. * testsuite/ld-ctf/cycle-2.A.d: Likewise. * testsuite/ld-ctf/cycle-2.B.d: Likewise. * testsuite/ld-ctf/cycle-2.C.d: Likewise. * testsuite/ld-ctf/diag-wrong-magic-number-mixed.d: Likewise. * testsuite/ld-ctf/super-sub-cycles.d: Likewise. * testsuite/ld-ctf/data-func-1.c: New test. * testsuite/ld-ctf/data-func-2.c: Likewise. * testsuite/ld-ctf/data-func-conflicted.d: Likewise.
2020-07-22ld: new CTF testsuiteEgeyar Bagcioglu1-0/+40
Uses the new cc option to run_dump_test to compile most tests from C code, ensuring that the types in the C code accurately describe what the .d file is testing. (Some tests, mostly those testing malformed CTF, run directly from .s, or include both .s and .c.) ld/ * testsuite/ld-ctf/ctf.exp: New file. * testsuite/ld-ctf/A-2.c: New file. * testsuite/ld-ctf/A.c: New file. * testsuite/ld-ctf/B-2.c: New file. * testsuite/ld-ctf/B.c: New file. * testsuite/ld-ctf/C-2.c: New file. * testsuite/ld-ctf/C.c: New file. * testsuite/ld-ctf/array-char.c: New file. * testsuite/ld-ctf/array-int.c: New file. * testsuite/ld-ctf/array.d: New file. * testsuite/ld-ctf/child-float.c: New file. * testsuite/ld-ctf/child-int.c: New file. * testsuite/ld-ctf/conflicting-cycle-1.B-1.d: New file. * testsuite/ld-ctf/conflicting-cycle-1.B-2.d: New file. * testsuite/ld-ctf/conflicting-cycle-1.parent.d: New file. * testsuite/ld-ctf/conflicting-cycle-2.A-1.d: New file. * testsuite/ld-ctf/conflicting-cycle-2.A-2.d: New file. * testsuite/ld-ctf/conflicting-cycle-2.parent.d: New file. * testsuite/ld-ctf/conflicting-cycle-3.C-1.d: New file. * testsuite/ld-ctf/conflicting-cycle-3.C-2.d: New file. * testsuite/ld-ctf/conflicting-cycle-3.parent.d: New file. * testsuite/ld-ctf/conflicting-enums.d: New file. * testsuite/ld-ctf/conflicting-typedefs.d: New file. * testsuite/ld-ctf/cross-tu-1.c: New file. * testsuite/ld-ctf/cross-tu-2.c: New file. * testsuite/ld-ctf/cross-tu-conflicting-2.c: New file. * testsuite/ld-ctf/cross-tu-cyclic-1.c: New file. * testsuite/ld-ctf/cross-tu-cyclic-2.c: New file. * testsuite/ld-ctf/cross-tu-cyclic-3.c: New file. * testsuite/ld-ctf/cross-tu-cyclic-4.c: New file. * testsuite/ld-ctf/cross-tu-cyclic-conflicting.d: New file. * testsuite/ld-ctf/cross-tu-cyclic-nonconflicting.d: New file. * testsuite/ld-ctf/cross-tu-into-cycle.d: New file. * testsuite/ld-ctf/cross-tu-noncyclic.d: New file. * testsuite/ld-ctf/cycle-1.c: New file. * testsuite/ld-ctf/cycle-1.d: New file. * testsuite/ld-ctf/cycle-2.A.d: New file. * testsuite/ld-ctf/cycle-2.B.d: New file. * testsuite/ld-ctf/cycle-2.C.d: New file. * testsuite/ld-ctf/diag-ctf-version-0.d: New file. * testsuite/ld-ctf/diag-ctf-version-0.s: New file. * testsuite/ld-ctf/diag-ctf-version-2-unsupported-feature.d: New file. * testsuite/ld-ctf/diag-ctf-version-2-unsupported-feature.s: New file. * testsuite/ld-ctf/diag-ctf-version-f.d: New file. * testsuite/ld-ctf/diag-ctf-version-f.s: New file. * testsuite/ld-ctf/diag-cttname-invalid.d: New file. * testsuite/ld-ctf/diag-cttname-invalid.s: New file. * testsuite/ld-ctf/diag-cttname-null.d: New file. * testsuite/ld-ctf/diag-cttname-null.s: New file. * testsuite/ld-ctf/diag-cuname.d: New file. * testsuite/ld-ctf/diag-cuname.s: New file. * testsuite/ld-ctf/diag-decompression-failure.d: New file. * testsuite/ld-ctf/diag-decompression-failure.s: New file. * testsuite/ld-ctf/diag-parlabel.d: New file. * testsuite/ld-ctf/diag-parlabel.s: New file. * testsuite/ld-ctf/diag-parname.d: New file. * testsuite/ld-ctf/diag-parname.s: New file. * testsuite/ld-ctf/diag-unsupported-flag.d: New file. * testsuite/ld-ctf/diag-unsupported-flag.s: New file. * testsuite/ld-ctf/diag-wrong-magic-number-mixed.d: New file. * testsuite/ld-ctf/diag-wrong-magic-number.d: New file. * testsuite/ld-ctf/diag-wrong-magic-number.s: New file. * testsuite/ld-ctf/enum-2.c: New file. * testsuite/ld-ctf/enum.c: New file. * testsuite/ld-ctf/function.c: New file. * testsuite/ld-ctf/function.d: New file. * testsuite/ld-ctf/slice.c: New file. * testsuite/ld-ctf/slice.d: New file. * testsuite/ld-ctf/super-sub-cycles.c: New file. * testsuite/ld-ctf/super-sub-cycles.d: New file. * testsuite/ld-ctf/typedef-int.c: New file. * testsuite/ld-ctf/typedef-long.c: New file. * testsuite/ld-ctf/union-1.c: New file.