Usage example: tcc -xc ex5.cgi
From a gcc docs:
You can specify the input language explicitly with the -x option:
-x language
Specify explicitly the language for the following input files
(rather than letting the compiler choose a default based on the file
name suffix). This option applies to all following input files until
the next -x option. Possible values for language are:
c c-header c-cpp-output
c++ c++-header c++-cpp-output
objective-c objective-c-header objective-c-cpp-output
objective-c++ objective-c++-header objective-c++-cpp-output
assembler assembler-with-cpp
ada
f77 f77-cpp-input f95 f95-cpp-input
java
-x none
Turn off any specification of a language, so that subsequent files
are handled according to their file name suffixes (as they are if -x
has not been used at all)
library Cello: http://libcello.org/ which uses `$` and several
variations of as macros.
There is also RayLanguage which also uses it as a macro for a kind of
ObjC style message passing: https://github.com/kojiba/RayLanguage
This is a patch from Daniel Holden.
* define __bound_init as external_global_sym insteed of the compiling
a tiny program
* remove warning about buf[] when CONFIG_TCC_BCHECK is not defined
This is for a case when no '{' is used in the initialization code.
An option name is -fold-struct-init-code. A linux 2.4.26 can't
find initrd when compiled with a new algorithm.
Lets assume that in *.S files a preprocessor directive
follow '#' char w/o spaces between. Otherwise there is
too many problems with the content of the comments.
* tell a right line number in error message
if a #line directive is wrong
* don't print an error message if we preprocess a .S file
and #line directive is wrong. This is the case of
the
# 4026 bytes
comment in *.S file.
* preprocess_skip: skip a line with
if (parse_flags & PARSE_FLAG_ASM_COMMENTS)
p = parse_line_comment(p);
if line starts with # and a preprocessor command not found.
A test program:
#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
# This repeats until either a device doesn't exist, or until
#endif
* remove a second definition of the TOK_FLAG_* and PARSE_FLAG_*
from the tccpp.c
* define targetos=Windows when --enable-tcc32-mingw, --enable-cygwin, ...
* use TARGETOS insteed HOST_OS when selecting PROGS
* use "$(tccdir)" insteed $(tccdir) on install (spaces in path)
* install tcc.exe too
* produce bcheck.o when cross-compiling too (lib/Makefile)
* force bcheck.o linking by compiling inside tcc_set_output_type()
a dummy program with local array. Otherwise bcheck.o may be not linked.
* replace %xz format specifier with %p in bcheck (don't supported on
Windows)
* call a __bound_init when __bound_ptr_add, __bound_ptr_indir,
__bound_new_region, __bound_delete_region called.
This is because a __bound_init inside ".init" section is not called
on Windows for unknown reason.
* print on stderr a message when an illegal pointer is returned:
there is no segmentation violation on Windows for a program
compiled with "tcc -b"
* remove "C:" subdir on clean if $HOST_OS = "Linux"
* default CFLAGS="-Wall -g -O0" insteed CFLAGS="-Wall -g -O2"
to speed up compilation and more precise debugging.
tcc w/o -g option generate an executable file which format
is not recognized by binutils. It is like stripped one but
binutils don't think so. Solution: generate not stripped
file which can be correctly stripped by external utils.
may be there is a need to handle a -s option and call
a sstrip/strip program to do a job.
------------ libtest ------------
./libtcc_test lib_path=..
<string>:11: warning: implicit declaration of function 'printf'
<string>:13: warning: implicit declaration of function 'add'
------------ test3 ------------
tcctest.c:1982: warning: implicit declaration of function 'putchar'
tcctest.c:2133: warning: implicit declaration of function 'strlen'
- a warning: unnamed struct/union that defines no instances
- allow a nested named struct declaration w/o identifier
only when option -fms-extensions is used
- care about __attribute__ redefinition in the system headers
- an invalid pointer must be returned when (addr >= e->size),
and not (addr > e->size)
A test program:
#include <stdio.h>
#include <stdlib.h>
int main ()
{
int v[10];
fprintf(stderr, "&v[0] = %p\n", &v[0]);
fprintf(stderr, "&v[10] = %p\n", &v[10]);
exit(1);
return 0;
}
// tcc -b test.c
The output before a patch:
&v[0] = 0xbf929d8c
&v[10] = 0xbf929db4
The output after a patch:
&v[0] = 0xbff6e33c
&v[10] = 0xfffffffe
On Linux 32: sizeof(long)=32 == sizeof(void *)=32
on Linux 64: sizeof(long)=64 == sizeof(void *)=64
on Windows 64: sizeof(long)=32 != sizeof(void *)=64
The following program (errno.c) reports errno=2 when run
using "tcc -run errno.c"
#include <errno.h>
#include <stdio.h>
int main(void) { printf("errno=%d\n", errno); return 0; }
A test program (must be compiled by the above version of the tcc):
/* Tickle a bug in TinyC on 64-bit systems:
* the LSB of the top word or ARGP gets set
* for no obvious reason.
*
* Source: a legacy language interpreter which
* has a little stack / stack pointer for arguments.
*
* Output is: 0x8049620 0x10804961c
* Should be: 0x8049620 0x804961c
*/
#include <stdio.h>
#define NARGS 20000
int ARG[NARGS];
int *ARGSPACE = ARG;
int *ARGP = ARG - 1;
main() { printf("%p %p\n", ARGSPACE, ARGP); }
Force to use a NATIVE_DEFINES insteed of the DEFINES for the
native tcc. After this change we have on debian/ubuntu
# ./x86_64-tcc -vv
tcc version 0.9.26 (x86-64, Linux)
install: /usr/local/lib/tcc
crt:
/usr/lib/x86_64-linux-gnu
libraries:
/usr/lib/x86_64-linux-gnu
/usr/lib
/lib/x86_64-linux-gnu
/lib
/usr/local/lib/x86_64-linux-gnu
/usr/local/lib
include:
/usr/local/include/x86_64-linux-gnu
/usr/local/include
/usr/include/x86_64-linux-gnu
/usr/include
/usr/local/lib/tcc/include
elfinterp:
/lib64/ld-linux-x86-64.so.2
Before this change the output was
# ./x86_64-tcc -vv
tcc version 0.9.26 (x86-64, Linux)
install: /usr/local/lib/tcc
crt:
/usr/lib
libraries:
/usr/lib
/lib
/usr/local/lib
include:
/usr/local/include
/usr/include
/usr/local/lib/tcc/include
elfinterp:
/lib64/ld-linux-x86-64.so.2
This change don't fix a cross compilers
The following check in tccgen.c is removed
if (nocode_wanted)
tcc_error("statement expression in global scope");
This check is introduced in commit 5bcc3eed7b and breaks compilation
of the linux 2.4.26 kernel.
i386-tcc.exe is a compiler for i386 Linux. A HOST_OS variable in Makefile is
introduced and used to select a native compiler (which one to name as tcc.exe)
a test program:
struct {
int a[2], b[2];
} cases[] = {
{ ((int)0), (((int)0)) },
((int)0), (((int)0)) /* error: ',' expected (got ")") */
};
int main() { return 0; }
This commit allow to skip ')' in the decl_initializer() and to see ','
A test program:
/* result of the new version inroduced in 4ad186c5ef: t2a = 44100312 */
#include<stdio.h>
int main() {
int t1 = 176401255;
float f = 0.25f;
int t2a = (int)(t1 * f); // must be 44100313
int t2b = (int)(t1 * (float)0.25f);
printf("t2a=%d t2b=%d \n",t2a,t2b);
return 0;
}
* Don't use /usr/local/lib/tcc/libtcc1.a for i386 and x86_64
A $(tccdir)/i386 directory was used to install a libtcc1.a
but only when cross compiling. And no x86_64 directory.
* Build/install i386-tcc/x86_64-tcc and not a tcc
* Build/install i386-win-tcc/x86_64-win-tcc and not a i386-win-mingw32-tcc/...
* DEFINES = -DTCC_TARGET_I386... also for i386-tcc and i386-win-tcc
* Make a symlink tcc to the i386-tcc/x86_64-tcc for a "make test"
* Build a $(ARCH) directory with a symlink to the libtcc1.a for a "make test"
* Remove a /usr/local/lib/tcc directory on uninstall
* Remove a /usr/local/share/doc/tcc directory on uninstall
* Remove a $(ARCH) directory on "make clean"
* Remove a *-tcc files on "make clean"
produce a
i386-win-mingw32-tcc
i386-win-tcc
x86_64-win-mingw32-tcc
x86_64-win-tcc
arm-win-mingw32ce-tcc
arm-win-tcc
instead of the
i386-w64-mingw32-tcc
i386-win32-tcc
x86_64-w64-mingw32-tcc
x86_64-win32-tcc
arm-wince-mingw32ce-tcc
arm-win32-tcc
Replacing a *-win32 directory names with a *-win names
because this names are based on the names of the tcc
x86_64-win32-tcc, i386-win32-tcc
* x86_64-tcc: use /usr/lib64,.. instead of /usr/lib,..
* don't set tcc_lddir="lib64" if cpu="x86"
* put a definition of the CONFIG_LDDIR into config.h instead
of the config.mak Otherwise a "lib" string may be used by default.
This is a usual case when building a x86_64-tcc (there was
no -DCONFIG_LDDIR building this binary).
* suppress -Wdeprecated-declarations for gcc which complain on malloc hooks
in bcheck.c if glibc is quite new.
Set CONFIG_MULTIARCHDIR for cross compilers.
Chances a cross-compiler will find a working crt*.o
in /usr/lib are more or less 0.
This commit breaks x86 / x86_64 compilres for linux. A solution for the crt*.o
must be discussed.
must be:
# ./x86_64-tcc -vv
tcc version 0.9.26 (x86-64, Linux)
install: /usr/local/lib/tcc
crt:
/usr/lib64
libraries:
/usr/lib64
/lib64
/usr/local/lib64
include:
/usr/local/include
/usr/include
/usr/local/lib/tcc/include
elfinterp:
/lib64/ld-linux-x86-64.so.2
and with MULTIARCH we have:
# ./x86_64-tcc -vv
tcc version 0.9.26 (x86-64 Linux)
install: /usr/local/lib/tcc/
crt:
/usr/lib/x86_64-linux-gnu ???????????????????
libraries:
/usr/lib/x86_64-linux-gnu
/usr/lib ???????????????????
/lib/x86_64-linux-gnu
/lib ???????????????????
/usr/local/lib/x86_64-linux-gnu
/usr/local/lib ???????????????????
include:
/usr/local/include/x86_64-linux-gnu
/usr/local/include
/usr/include/x86_64-linux-gnu
/usr/include
/usr/local/lib/tcc/include
elfinterp:
/lib64/ld-linux-x86-64.so.2
And CONFIG_MULTIARCHDIR don't handle C67.
On Linux x86 we have:
# ./c67-tcc -vv
tcc version 0.9.26 (C67, Linux)
install: /usr/local/lib/tcc
crt:
/usr/lib
libraries:
/usr/lib
/lib
/usr/local/lib
include:
/usr/local/include
/usr/include
/usr/local/lib/tcc/include
elfinterp:
/lib/ld-linux.so.2
* don't setup a cpu before scanning for --cpu=
* --cpu= option sets a 'cpu' variable, not a 'build_cpu', 'build_cpu' was not used anywhere.
* if cpu="" and ARCH != "" then cpu=$ARCH else cpu=`uname -m`
* replace "Build CPU" with "Target CPU" in the output of the configure script.
output this value only when not builing a cross compilers.
* remove a HOST_I386, ... defines from a config.h file.
thise defines are not used anywhere and cpu is now used to define a target cpu
From: Matteo Cypriani <mcy@lm7.fr>
Date: Fri, 5 Sep 2014 23:22:56 -0400
Subject: Disable floating-point test for ARM soft-float
tcc is not yet capable of doing softfloat floating-point operations on
ARM, therefore we disable this test for these platforms. Note that tcc
displays a warning to warn ARM users about this limitation
(debian)
Win32, Win64, WinCE when executing "tcc -v". Example
$ ./i386-win-tcc -v
tcc version 0.9.26 (i386, mingw)
instead of the
tcc version 0.9.26 (i386, Win32)
There is a cpu info already about bits of the excution environment
And display C67 for the TCC_TARGET_C67
Don't use /usr/local/lib/tcc/libtcc1.a for i386 and x86_64
A $(tccdir)/i386 directory was used to install a libtcc1.a
but only when cross compiling. And no x86_64 directory.
And this directory location was unknown inside tccelf.c
From: Matteo Cypriani <mcy@lm7.fr>
Date: Fri, 5 Sep 2014 23:22:56 -0400
Subject: Disable floating-point test for ARM soft-float
tcc is not yet capable of doing softfloat floating-point operations on
ARM, therefore we disable this test for these platforms. Note that tcc
displays a warning to warn ARM users about this limitation
(debian)
arm-gen.c: In function `gfunc_call':
arm-gen.c:1202: warning: unused variable `variadic'
arm-gen.c: In function `gfunc_prolog':
arm-gen.c:1258: warning: unused variable `avregs'
arm-gen.c:1340: warning: label `from_stack' defined but not used
arm-gen.c:222: warning: 'default_elfinterp' defined but not used
A non declared function leads to a seriuos problems. And while
gcc don't turn this warning on lets tcc do it. This warning
can be turned off by -Wno-implicit-function-declaration option.
And autor must explicitly do this if program must be compiled
with this warning off.
tcc version 0.9.26 (i386 Linux)
Tiny C Compiler - Copyright (C) 2001-2006 Fabrice Bellard
Usage: tcc [options...] [-o outfile] [-c] infile(s)...
tcc [options...] -run infile [arguments...]
...
instead of the
tcc version 0.9.26 - Tiny C Compiler - Copyright (C) 2001-2006 Fabrice Bellard
Usage: tcc [options...] [-o outfile] [-c] infile(s)...
tcc [options...] -run infile [arguments...]
...
Displaing a "Hard Float" info for the ARM arch is restored. It was broken by the AArm64 patch.
Author: Thomas Preud'homme <robotux@celest.fr>
Date: Tue Dec 31 23:51:20 2013 +0800
Move logic for if (int value) to tccgen.c
Move the logic to do a test of an integer value (ex if (0)) out of
arch-specific code to tccgen.c to avoid code duplication. This also
fixes test of long long value which was only testing the bottom half of
such values on 32 bits architectures.
I don't understand why if () in gtst(i) was removed.
This patch allows to compile a linux kernel v.2.4.26
W/o this patch a tcc simply crashes.
A test program:
//////////////
int main()
{
void *p = ({ 0 ; ((void *)1); });
}
/////////////
Porblem is introduced in a commit a80acab: Display error on statement expressions with complex return type
This error is exposed when compiling a linux 2.4.26. tcc 0.9.23 can sucessfully compile
this version of the linux.
Current tcc don't understand an initialization of the empty struct
This problem was found trying to compile a linux kernel 2.4.26
which can be compiled by tcc 0.9.23
A test program:
////////////////////
// ./tcc -c test_3.c
// test_3.c:31: error: too many field init
#undef __GNUC__
#undef __GNUC_MINOR__
#define __GNUC__ 2
#define __GNUC_MINOR__ 95
typedef struct { } rwlock_t;
struct fs_struct {
int count;
rwlock_t lock;
int umask;
};
#define INIT_FS { \
1, \
RW_LOCK_UNLOCKED, \
0022, \
}
#if (__GNUC__ > 2 || __GNUC_MINOR__ > 91)
typedef struct { } rwlock_t;
#define RW_LOCK_UNLOCKED (rwlock_t) { }
#else
typedef struct { int gcc_is_buggy; } rwlock_t;
#define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
#endif
static struct fs_struct init_fs = INIT_FS;
// static struct fs_struct init_fs = { { (1) }, (rwlock_t) { 0 }, 0022, };
// ^ with this all Ok
// static struct fs_struct init_fs = { { (1) }, (rwlock_t) { }, 0022, };
// ^ current tcc don't understand, but tcc 0.9.23 can
int main()
{
return 0;
}
////////////////////
A regression is detected after a patch 69fdb57edd
////////////////////
// A test for patch 69fdb57edd
// Author: grischka <grischka>
// Date: Wed Jun 17 02:09:07 2009 +0200
// unions: initzialize only one field
// struct {
// union {
// int a,b;
// };
// int c;
// } sss = { 1,2 };
// This had previously assigned 1,2 to a,b and 0 to c which is wrong.
//
// Expected: sss.a=1 sss.b=1 sss.c=2
int main()
{
struct {
union {
int a,b;
};
int c;
} sss = { 1, 2 };
printf ("sss.a=%d sss.b=%d sss.c=%d\n", sss.a, sss.b, sss.c);
return 0;
}
////////////////////
A regression was found trying to compile a linux kernel 2.4.26
which can be compiled by tcc 0.9.23
///////////////////
#include <stdio.h>
// test for a bug:
// compiler don't understand am extern array of structs
// $ tcc test_1.c
// test_1.c:8: error: unknown struct/union/enum
extern struct FILE std_files[4];
int main()
{
return 0;
}
//////////////////
tcc-current
/* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
static void struct_decl(CType *type, int u, int tdef)
...
if (tok != '{') {
v = tok;
next();
/* struct already defined ? return it */
if (v < TOK_IDENT)
expect("struct/union/enum name");
s = struct_find(v);
if (s) {
if (s->type.t != a)
tcc_error("invalid type");
goto do_decl;
} else if (tok >= TOK_IDENT && !tdef)
tcc_error("unknown struct/union/enum");
} else {
v = anon_sym++;
}
tcc-0.9.23 which don't have such error
/* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
static void struct_decl(CType *type, int u)
....
if (tok != '{') {
v = tok;
next();
/* struct already defined ? return it */
if (v < TOK_IDENT)
expect("struct/union/enum name");
s = struct_find(v);
if (s) {
if (s->type.t != a)
error("invalid type");
goto do_decl;
}
} else {
v = anon_sym++;
}
It is a strange patch because before this commit a gdb is working well
and after this commit there is exactly the same problem on Linux:
gdb refuses to know "main"
Author: grischka <grischka>
Date: Tue Feb 5 21:18:29 2013 +0100
tccelf: fix debug section relocation
With:
tcc -g hello.c
gdb a.out
b main
gdb refused to know "main" because of broken dwarf info.
in the same pass like
tcc -E one.c two.c three.c -o combined.i
This will allow to speed up a compilation process by using a commamd like
tcc -E *.c | tcc -o program.exe -xc -
It looks that multi-times initialization don't affect anything.
Only call to the free_defines(define_start) in tcc_preprocess()
is removed in assumption that free_defines(NULL) in
tcc_cleanup() will free all defines.
With this option on a defines are included into the output
(inside comments). This will allow to debug a problems like:
In file included from math.c:8:
In file included from /usr/include/math.h:43:
/usr/include/bits/nan.h:52: warning: NAN redefined
tcc -E -P
do not output a #line directive, a gcc compatible option
tcc -E -P1
don't follow a gcc preprocessor style and do output a standard
#line directive. In such case we don't lose a location info when
we going to compile a resulting file wtith a compiler not
understanding a gnu style line info.
A cpp from gcc do this.
A test case:
tcc -E tccasm.c -o tccasm.i
tcc -E tccasm.i -o tccasm.ii
After a patch the line numbers in tccasm.ii are the same
as in tccasm.i
Add a ".i" extension as alias for ".c"
GCC and file extensions:
.i C source code which should not be preprocessed.
Before a patch:
./tcc -E tccasm.c -o tccasm.i
./tcc -c tccasm.i -o tccasm.o
tccasm.i:1: error: unrecognized file type
seyko