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Kirill Smelkov 0c928da96d tcc: Draft suppoprt for -MD/-MF options
In build systems, this is used to automatically collect target
dependencies, e.g.

    ---- 8< (hello.c) ----
    #include "hello.h"
    #include <stdio.h>

    int main()
    {
        printf("Hello World!\n");
        return 0;
    }

$ tcc -MD -c hello.c    # -> hello.o, hello.d
$ cat hello.d
hello.o : \
        hello.c \
        hello.h \
        /usr/include/stdio.h \
        /usr/include/features.h \
        /usr/include/bits/predefs.h \
        /usr/include/sys/cdefs.h \
        /usr/include/bits/wordsize.h \
        /usr/include/gnu/stubs.h \
        /usr/include/bits/wordsize.h \
        /usr/include/gnu/stubs-32.h \
        /home/kirr/local/tcc/lib/tcc/include/stddef.h \
        /usr/include/bits/types.h \
        /usr/include/bits/wordsize.h \
        /usr/include/bits/typesizes.h \
        /usr/include/libio.h \
        /usr/include/_G_config.h \
        /usr/include/wchar.h \
        /home/kirr/local/tcc/lib/tcc/include/stdarg.h \
        /usr/include/bits/stdio_lim.h \
        /usr/include/bits/sys_errlist.h \

NOTE: gcc supports -MD only for .c -> .o, but in tcc, we generate
dependencies for whatever action is being taken. E.g. for .c -> exe, the
result will be:

$ tcc -MD -o hello hello.c  # -> hello, hello.d
hello: \
        /usr/lib/crt1.o \
        /usr/lib/crti.o \
        hello.c \
        hello.h \
        /usr/include/stdio.h \
        /usr/include/features.h \
        /usr/include/bits/predefs.h \
        /usr/include/sys/cdefs.h \
        /usr/include/bits/wordsize.h \
        /usr/include/gnu/stubs.h \
        /usr/include/bits/wordsize.h \
        /usr/include/gnu/stubs-32.h \
        /home/kirr/local/tcc/lib/tcc/include/stddef.h \
        /usr/include/bits/types.h \
        /usr/include/bits/wordsize.h \
        /usr/include/bits/typesizes.h \
        /usr/include/libio.h \
        /usr/include/_G_config.h \
        /usr/include/wchar.h \
        /home/kirr/local/tcc/lib/tcc/include/stdarg.h \
        /usr/include/bits/stdio_lim.h \
        /usr/include/bits/sys_errlist.h \
        /usr/lib/libc.so \
        /lib/libc.so.6 \
        /usr/lib/ld-linux.so.2 \
        /lib/ld-linux.so.2 \
        /usr/lib/libc_nonshared.a \
        /lib/libc.so.6 \
        /usr/lib/libc_nonshared.a \
        /home/kirr/local/tcc/lib/tcc/libtcc1.a \
        /usr/lib/crtn.o \

So tcc dependency generator is a bit more clever than one used in gcc :)

Also, I've updated TODO and Changelog (in not-yet-released section).

v2:

(Taking inputs from grischka and me myself)

- put code to generate deps file into a function.
- used tcc_fileextension() instead of open-coding
- generate deps only when compilation/preprocessing was successful

v3:

- use pstrcpy instead of snprintf(buf, sizeof(buf), "%s", ...)
2010-06-21 20:49:02 +04:00
examples weak function symbols 2010-02-27 17:37:59 +01:00
include win64: defined size_t and ptrdiff_t to unsigned long long 2010-01-14 20:59:43 +01:00
lib win32: enable bounds checker & exception handler 2009-12-19 22:22:43 +01:00
tests Fix bashims in configure and gcctestsuite.sh. 2010-05-26 14:08:29 +02:00
win32 win32: sys/timeb.h use _ftime instead of _ftime32 2010-04-12 20:56:13 +02:00
.gitignore .gitignore += *.o *.a 2010-06-12 18:26:37 +04:00
COPYING changed license to LGPL 2003-05-24 14:18:56 +00:00
Changelog tcc: Draft suppoprt for -MD/-MF options 2010-06-21 20:49:02 +04:00
Makefile Don't load libtcc1 on arch where it doesn't exist 2010-05-01 17:20:28 +02:00
README win32: readme.txt->tcc-win32.txt, update tcc-doc 2009-04-18 15:08:03 +02:00
TODO tcc: Draft suppoprt for -MD/-MF options 2010-06-21 20:49:02 +04:00
VERSION update Changelog, bump version: 0.9.25 2009-05-11 19:01:26 +02:00
arm-gen.c ARM: use uint32_t for opcodes 2010-05-13 22:17:09 +02:00
c67-gen.c allow tcc be build from separate objects 2009-12-20 01:53:49 +01:00
coff.h C67 COFF executable format support (TK) 2004-10-05 22:33:55 +00:00
configure Fix bashims in configure and gcctestsuite.sh. 2010-05-26 14:08:29 +02:00
elf.h don't discard SHT_((PRE)INIT|FINI)_ARRAY sections 2010-05-15 01:26:56 +02:00
i386-asm.c win64: add tiny unwind data for setjmp/longjmp 2009-12-20 01:54:37 +01:00
i386-asm.h integrate x86_64-asm.c into i386-asm.c 2009-12-19 22:16:20 +01:00
i386-gen.c chmod a-x i386-gen.c 2010-06-16 14:37:30 +04:00
i386-tok.h integrate x86_64-asm.c into i386-asm.c 2009-12-19 22:16:20 +01:00
il-gen.c cleanup: constify some global data 2009-07-18 22:07:42 +02:00
il-opcodes.h added CIL target 2002-02-10 16:14:03 +00:00
libtcc.c tcc: Draft suppoprt for -MD/-MF options 2010-06-21 20:49:02 +04:00
libtcc.h tcc: Draft suppoprt for -MD/-MF options 2010-06-21 20:49:02 +04:00
stab.def added 2002-12-08 14:36:36 +00:00
stab.h added 2002-12-08 14:36:36 +00:00
tcc-doc.texi tcc: add "-Wl,-rpath=path" option (library search path) 2009-12-19 22:16:20 +01:00
tcc.c tcc: Draft suppoprt for -MD/-MF options 2010-06-21 20:49:02 +04:00
tcc.h tcc: Draft suppoprt for -MD/-MF options 2010-06-21 20:49:02 +04:00
tccasm.c Revert "tccpp: Allow local labels to start with a dot" 2010-05-06 21:42:37 +02:00
tcccoff.c build from multiple objects: fix other targets 2009-12-20 20:33:41 +01:00
tccelf.c don't discard SHT_((PRE)INIT|FINI)_ARRAY sections 2010-05-15 01:26:56 +02:00
tccgen.c append ULL to big constants 2010-05-13 22:18:33 +02:00
tccpe.c WinCE PE subsystem 2010-04-19 16:34:59 +03:00
tccpp.c tcc: Draft suppoprt for -MD/-MF options 2010-06-21 20:49:02 +04:00
tccrun.c ARM: implement rt_get_caller_pc 2010-05-14 14:22:32 +02:00
tcctok.h Add nan, snan and inf float constants 2010-05-06 02:20:35 +02:00
texi2pod.pl automatic man page generation from tcc-doc.texi 2003-05-18 18:11:06 +00:00
x86_64-asm.h x86-64: fix udiv, add cqto instruction 2009-12-19 22:16:19 +01:00
x86_64-gen.c tccpe: improve dllimport/export and use for tcc_add_symbol 2010-01-14 20:59:42 +01:00

README

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 torward 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 Linux host (for Windows read tcc-win32.txt)

   ./configure
   make
   make test
   make install

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 !

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.