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Michael Matz 352e1d0fc4 Reinstate attribute alias handling
commit 2a0167a merged alias and asm symbol renaming, but broke
semantics of aliases, see testcase.  Basically the difference between
the two is that an asm rename doesn't generate a new symbol, i.e. with

  int foo __asm__("bar");

all source reference to 'foo' will be to 'bar', nothing of the name
'foo' will remain in the object file, and for instance reference to
'foo' from other compilation units won't be resolved to this one.

Aliases OTOH create an additional symbol.  With:

  void target (void) { return; }
  void afunc (void) __attribute__((alias("target")));

reference to 'afunc' will remain 'afunc' in the object file.  It will
generate two symbols, 'afunc' and 'target' referring to the same entity.
This difference matters if other compilation units make references to
'afunc'.

A side requirement of this is that for alias to work that the target
symbol needs to be defined in the same unit.  For TCC we even require a
stricter variant: it must be defined before the alias is created.

Now, with this I merely re-instated the old flow of events before above
commit.  It didn't seem useful anymore to place both names in the
asm_label member of attributes, and the asm_label member of Sym now
again only needs the hold the __asm__ rename.

It also follows that tcc_predefs.h can't make use of attribute alias to
e.g. map __builtin_memcpy to __bound_memcpy (simply because the latter
isn't defined in all units), but rather must use __asm__ renaming, which
in turn means that the underscore handling needs to be done by hand.
2020-09-30 17:46:01 +02:00
examples makefile: unify cross with native builds 2017-02-25 12:51:04 +01:00
include Add L suffix to LDBL values. 2020-07-16 07:59:34 +02:00
lib libtcc1.c: cleanup fp2ull 2020-09-17 20:25:31 +02:00
tests Reinstate attribute alias handling 2020-09-30 17:46:01 +02:00
win32 rm helper scripts newly added by me 2020-08-16 10:46:19 +08:00
.gitignore OSX: make libtcc.dylib 2020-03-21 23:57:00 +08:00
arm64-gen.c Struct va_arg fix 2020-09-17 08:42:28 +02:00
arm64-link.c Add arm64 dll support 2020-08-01 19:44:49 +02:00
arm-asm.c allow libtcc states to be used concurrently 2019-12-11 02:36:19 +01:00
arm-gen.c Move bound functions to tccgen.c 2020-07-12 10:55:40 +02:00
arm-link.c Add arm dll support 2020-08-04 09:15:42 +02:00
c67-gen.c tccgen.c: cleanup debug support 2020-05-11 11:41:56 +02:00
c67-link.c allow libtcc states to be used concurrently 2019-12-11 02:36:19 +01:00
Changelog 'long' review 2017-09-24 18:57:48 +02:00
CodingStyle CodingStyle: Remove reference to misaligned struct CString. 2016-01-06 19:09:28 +00:00
coff.h Spelling fixes in C comments only 2017-05-07 21:38:09 -07:00
configure some cleanups related to recent commits 2020-07-06 13:00:47 +02:00
conftest.c some cleanups related to recent commits 2020-07-06 13:00:47 +02:00
COPYING changed license to LGPL 2003-05-24 14:18:56 +00:00
elf.h riscv64: Add skeleton target 2019-08-14 18:18:46 +02:00
i386-asm.c __builtin_/__bound_: A 'stay tiny' approach to the matter 2020-07-06 13:42:02 +02:00
i386-asm.h x86-asm: Fix lar opcode operands 2016-12-15 17:47:08 +01:00
i386-gen.c Move bound functions to tccgen.c 2020-07-12 10:55:40 +02:00
i386-link.c Fix boundschecking for signal/sigaction/fork 2020-09-08 14:31:58 +02:00
i386-tok.h x86-64-asm: Support high registers %r8 - %r15 2016-12-15 17:47:09 +01:00
il-gen.c Spelling fixes in C comments only 2017-05-07 21:38:09 -07:00
il-opcodes.h Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
libtcc.c Add -C gcc compatible option which does currently nothing. This allows, among others, to compile gnumake from git ROOTB. 2020-07-11 06:41:44 +02:00
libtcc.h libtcc: accept tcc_define_symbol(s1, "sym=value", NULL) 2020-07-06 13:00:47 +02:00
Makefile Revert commit 55f8963dfa from wanjochan until better tested on all platforms 2020-09-10 05:49:15 +02:00
README README: Fix typo and remove trailing whitespace 2019-09-14 15:37:20 +02:00
RELICENSING Add note about native Windows bootstrap using Cygwin. 2017-02-23 06:45:26 +01:00
riscv64-asm.c Add bound checking to arm, arm64 and riscv64 2020-06-16 07:39:48 +02:00
riscv64-gen.c Struct va_arg fix 2020-09-17 08:42:28 +02:00
riscv64-link.c Add riscv dll support 2020-08-04 10:36:47 +02:00
stab.def Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
stab.h Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
tcc-doc.texi Fix boundschecking for signal/sigaction/fork 2020-09-08 14:31:58 +02:00
tcc.c Add -C gcc compatible option which does currently nothing. This allows, among others, to compile gnumake from git ROOTB. 2020-07-11 06:41:44 +02:00
tcc.h Reinstate attribute alias handling 2020-09-30 17:46:01 +02:00
tccasm.c some cleanups related to recent commits 2020-07-06 13:00:47 +02:00
tcccoff.c allow libtcc states to be used concurrently 2019-12-11 02:36:19 +01:00
tccelf.c function pointer compare 2020-09-21 09:18:48 +02:00
tccgen.c Reinstate attribute alias handling 2020-09-30 17:46:01 +02:00
tcclib.h Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
tccmacho.c Revert commit 55f8963dfa from wanjochan until better tested on all platforms 2020-09-10 05:49:15 +02:00
tccpe.c Indentation was missing after empty string check was added by wanjochan. 2020-09-18 06:39:30 +02:00
tccpp.c Reinstate attribute alias handling 2020-09-30 17:46:01 +02:00
tccrun.c riscv64: Work around qemu bug 2020-07-15 23:11:58 +02:00
tcctok.h bcheck: remove static (compile-time) control 2020-08-21 20:26:36 +02:00
tcctools.c tcc -MD: drop system includes and duplicates 2020-06-17 18:01:40 +02:00
texi2pod.pl Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
TODO Remove a bit-field TODO 2017-04-29 22:09:10 +02:00
USES USES: add mpc library 2020-07-11 20:00:37 +02:00
VERSION update VERSION to 0.9.27 2017-02-08 19:56:15 +01:00
x86_64-asm.h x86-64-asm: Fix mov im64,rax encoding 2017-02-23 00:16:25 +01:00
x86_64-gen.c Struct va_arg fix 2020-09-17 08:42:28 +02:00
x86_64-link.c Fix boundschecking for signal/sigaction/fork 2020-09-08 14:31:58 +02:00

Tiny C Compiler - C Scripting Everywhere - The Smallest ANSI C compiler
-----------------------------------------------------------------------

Features:
--------

- SMALL! You can compile and execute C code everywhere, for example on
  rescue disks.

- FAST! tcc generates optimized x86 code. No byte code
  overhead. Compile, assemble and link about 7 times faster than 'gcc
  -O0'.

- UNLIMITED! Any C dynamic library can be used directly. TCC is
  heading toward full ISOC99 compliance. TCC can of course compile
  itself.

- SAFE! tcc includes an optional memory and bound checker. Bound
  checked code can be mixed freely with standard code.

- Compile and execute C source directly. No linking or assembly
  necessary. Full C preprocessor included.

- C script supported : just add '#!/usr/local/bin/tcc -run' at the first
  line of your C source, and execute it directly from the command
  line.

Documentation:
-------------

1) Installation on a i386/x86_64/arm Linux/OSX/FreeBSD host

   ./configure
   make
   make test
   make install

   Notes: For OSX and FreeBSD, gmake should be used instead of make.
   For Windows read tcc-win32.txt.

makeinfo must be installed to compile the doc.  By default, tcc is
installed in /usr/local/bin.  ./configure --help  shows configuration
options.


2) Introduction

We assume here that you know ANSI C. Look at the example ex1.c to know
what the programs look like.

The include file <tcclib.h> can be used if you want a small basic libc
include support (especially useful for floppy disks). Of course, you
can also use standard headers, although they are slower to compile.

You can begin your C script with '#!/usr/local/bin/tcc -run' on the first
line and set its execute bits (chmod a+x your_script). Then, you can
launch the C code as a shell or perl script :-) The command line
arguments are put in 'argc' and 'argv' of the main functions, as in
ANSI C.

3) Examples

ex1.c: simplest example (hello world). Can also be launched directly
as a script: './ex1.c'.

ex2.c: more complicated example: find a number with the four
operations given a list of numbers (benchmark).

ex3.c: compute fibonacci numbers (benchmark).

ex4.c: more complicated: X11 program. Very complicated test in fact
because standard headers are being used ! As for ex1.c, can also be launched
directly as a script: './ex4.c'.

ex5.c: 'hello world' with standard glibc headers.

tcc.c: TCC can of course compile itself. Used to check the code
generator.

tcctest.c: auto test for TCC which tests many subtle possible bugs. Used
when doing 'make test'.

4) Full Documentation

Please read tcc-doc.html to have all the features of TCC.

Additional information is available for the Windows port in tcc-win32.txt.

License:
-------

TCC is distributed under the GNU Lesser General Public License (see
COPYING file).

Fabrice Bellard.