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tccgen.c:
- When __FUNCTION__ is used and no code is generated use symbol len = 0.

tccelf.c:
- If library is present in verneed it should be in DT_NEEDED.
- @plt symbols should have size 0
- set _GLOBAL_OFFSET_TABLE_ st_size correct
- Remove version symbol if new value present

reported by elflint:

__FUNCTION__ problem:
  section [19] '.symtab': symbol 2134 (L.195) does not fit completely in referenced section [14] '.data.ro'
DT_NEEDED problem:
  section [26] '.gnu.version_r': entry 2 references unknown dependency
@plt symbols should have size 0:
  section [22] '.symtab': symbol 36557 (r_core_config_init@plt) does not fit completely in referenced section [14] '.plt'
_GLOBAL_OFFSET_TABLE_ size:
  section [44] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol size 4 does not match .got section size 736
Remove version symbol:
  section [25] '.gnu.version': symbol 86: version index 3 is for requested version
  This happened for example with bounds checking symbol malloc

Using the environment CC is a common used feature to
select a compiler to build any software,
so it should be supported when building tcc.

The old way using the parameter --cc still works.

(resend)
Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

tccdbg.c
- Fix typo in dwarf_file. This resulted in not finding correct include
  files.

tccrun.c:
- Change FILE_TABLE_SIZE to 512. Some files use very large includes.
- When a dll containted more then 1 file the pc was not calculated
  correctly.

The compiler warned about the unicode_to_utf8 code.
I fixed it by giving an error. This is the same as gcc does.

Some small updates in tccdbg.c found by checking readelf output from
gcc/clang.

- Change encoding type bool type
- Fix enum signed/unsigned
- Do not hash anon symbol
- Use correct filename/line_number for global variables
- Fix compiler warning in tcc_get_dwarf_info
- Use unsigned long long for array indexes
- Display correct first line of function in gdb

The wrong vla stabs code was accepted by gdb.
The dwarf vla code was fatal.

Better avoid global variables, at least in new code.

tccdbg.c hopefully should be logically identical to the
former parts in tccgen/elf.c (s1 tccstate added in some
places)

tccelf.c: dwarf linkage seems special per dwarf rather
than special per target.

/* Use "-g" as alias for "-g1". Use "-g0" to disable debug */

So not using -g is now the alias for -g0 ?!?

This reverts commit 8759b258.
This reverts commit 3ce7bc6e.
This reverts commit 5fb582ab.
This reverts commit aea68dbb.
This reverts commit fa9c31c3.
This reverts commit b3bebdb2.
This reverts commit ecf8e5a0.
This reverts commit fe6b5c08.
This reverts commit e2e5377e.
This reverts commit 1cd79989.

readelf complained about DW_AT_stmt_list and DW_AT_location.
For dwarf >= 4 we should use DW_FORM_sec_offset instead of DW_FORM_data4
and DW_FORM_exprloc instead of DW_FORM_block1.
This is fixed in tccgen.c

I also updated tccrun.c to use dwarf_read_1 instead of DW_GETC.

This if for clang (pre)release 15.0.0.

tccrun.c:
- update directory/filename read. clang has extra md5 section
- start with filename 0 instead of 1. clang starts at 0
- change dwarf_read_32/dwarf_read_64 into macros

x86_64-link.c:
- Add support for R_X86_64_DTPOFF64/R_X86_64_TPOFF64. Needed by clang

tests/tcctest.c:
- add prototypes for puts/alloca. clang fails with error
- disable other_constraints_test for clang. clang prints 1 instead of 0

tccgen.c:
- add anon support. So tcc_state in tcc works now.
- add function pointer support
- remove DW_FORM_implicit_const from DW_TAG_pointer_type

tccrun.c:
- set initial file name
- correctly use pc in DW_LNE_set_address (see lib/bt-exe.c)
- add DW_LNE_define_file support (even if it is deprecated)

tccelf.c
- do not include debug/test_coverage information for stub functions

lib/bt-exe.c
- use num_callers=-1 to mark dll

Never do last minute commits :-(

The new gcc12 release does not support stabs any more.
This was a good reason to add support for dwarf.

The stabs code still works and is used if configure option --dwarf
is not used.

Tested on x86_64, i386, arm, arm64, riscv64 with dwarf-5.
Some debuggers may not support dwarf-5. Try using older dwarf versions
i that case.
The tccmacho.c code probably need some support for dwarf.

arm-gen.c, arm64-gen.c, i386-gen.c, riscv64-gen.c, x86_64-gen.
- fix get_sym_ref symbol size

arm-link.c, arm64-link.c, i386-link.c, riscv64-link.c, x86_64-link.c
- add R_DATA_32U

libtcc.c:
- parse -gdwarf option

tcc.c:
- add dwarf option

tcc.h:
- add dwarf option and sections

tccelf.c:
- init dwarf sections
- avoid adding sh_addr for dwarf sections
- remove dwarf relocs for output dll
- add dwarf sections for tccrun

tccgen.c:
- add dwarf defines + global data
- add dwarf_* functions
- mix dwarf code with stabs code
- a trick is used to emit function name in .debug_line section so
  only this section has to be parsed instead of .debug_info and
  .debug_abbrev.
- fix init debug_modes

tccrun.c:
- add dwarf sections in rt_context
- init them in tcc_run
- add new dwarf code rt_printline_dwarf to find file/function

dwarf.h:
- New file

tcc-doc.texi:
- document dwarf

configure:
- add dwarf option

lib/Makefile
- change -gstabs into -gdwarf

lib/bt-exe.c, tests/tests2/Makefile, tests/tests2/126_bound_global:
- Add __bound_init call
- Add new testcase to test it

Values were shamelessly stolen from musl libc. Needed for hare compiler.

This allows more tcc cross compiler to work out of the box
without a buildsystem-specific config-extra.mak

Only store registers that are needed in arm64 gfunc_prolog code.
Fix code in gen_bounds_epilog.

The code needs to be fixed: use the functions or remove them.

arm-asm.c:
asm_parse_vfp_regvar()

arm64-link:
gotplt_entry_type()
create_plt_entry()
Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

Warnings reported in in x86_64-gen.c and arm-gen.c:

warning: ‘align’ may be used uninitialized in this function [-Wmaybe-uninitialized]
Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

Target buffer must be larger as the format string + the replacement for %s
to avoid a warning [-Wformat-truncation=]
Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

Using the environment CC is a common used feature to
select a compiler to build any software,
so it should be supported when building tcc.

The old way using the parameter --cc still works.
Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

gcc12 uses the xmm registers a lot more.

- save xmm0/xmm1 in gen_bounds_epilog
- align stack for call to (__bound_)memmove call in gfunc_call

This does not change our generated code.
Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

Some headers and source code change macros and
implementation, when __OPTIMIZE_SIZE__ is defined.

This does not change our generated code.
Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

With this code, we can compile more projects,
who expect gcc or clang as compiler. (-std=gnu11 used in Makefiles)

As a further extension, it would be easy to disable gcc extensions
Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

"make help" already documents a "doc" target,
but it was not present.
Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

Support vla arrays like arr[][s]

- tcc.h: add nesting parameter
- tccgen.c: use nesting to test for illegal vla's
- test/tcctest.c: add test case

As suggested by Herman, move comment to the next line otherwise it incorrectly handles --config-bcheck=no --config-backtrace=no