Invalid main declaration && Missing input files

[JohnAlexINL]

The declaration of main:74 is missing a type entirely. I set this to int and proceeded.

Trying to run make lcc gives me an error about not having permission to write the .o files, so I sudo to give the process permission and proceeded.

Compilation then failed because /lburg/gram.c uses free but <stdlib.h> hasn't been included and no definition is given for free, so I include it at the top of the file and try to proceed again.

But at this stage, regardless of what C-compiler I try to build with (clang, gcc, tcc, chibicc, ...) I get variations of the same problem -- lots of files don't want to build because of implicit function use (which is possible to get past, but I still end up with missing output files, regardless) or because I'm missing .o objects or whatever

# sudo make lcc CC=gcc
cc -g -c -o /host.o 
cc: fatal error: no input files
compilation terminated.
make: *** [makefile:128: /host.o] Error 1

So okay, let's try just running each of the make commands on their own.

sudo make cpp
sudo make bprint
sudo make liblcc
sudo make lburg
sudo make rcc
make: Nothing to be done for 'cpp'.
make: Nothing to be done for 'bprint'.
make: Nothing to be done for 'liblcc'.
make: Nothing to be done for 'lburg'.
make: Nothing to be done for 'rcc'.

so those ones seem to work, but no matter what order I do the rest in, compilation fails, and the outputs generally look like

sudo make triple
cc -g -c -o /host.o 
cc: fatal error: no input files
compilation terminated.
make: *** [makefile:128: /host.o] Error 1

How am I supposed to build this? because make all doesn't work either

cpp/getopt.c:21:3: warning: add explicit braces to avoid dangling else [-Wdangling-else]
   21 |                 else if (strcmp(argv[optind], "--") == 0) {
      |                 ^
1 warning generated.
clang -g -c -Icpp -o /unix.o cpp/unix.c
clang -g  -o /cpp /cpp.o /lexer.o /nlist.o /tokens.o /macro.o /eval.o /include.o /hideset.o /getopt.o /unix.o 
clang -g -c -o /host.o 
clang: error: no input files
make: *** [makefile:128: /host.o] Error 1

[Azzydon]

I'm away from a system at the moment, however, from what I recall you need to set environment values to tell the build system where the files will be located before invoking make. Clearly host.o will not be located in the root of the filesystem. cc -g -c -o */host.o* Take a look at the statements at the top of the makefile.

…

-Vince

On Mon, Aug 12, 2024 at 11:50 PM John Alex ***@***.***> wrote: The declaration of main:74 <https://github.com/drh/lcc/blob/9bd428949f53b34980d194b1b4a2be921a85b5b4/etc/lcc.c#L74> is missing a type entirely. I set this to int and proceeded. Trying to run make lcc gives me an error about not having permission to write the .o files, so I sudo to give the process permission and proceeded. Compilation then failed because /lburg/gram.c uses free but <stdlib.h> hasn't been included and no definition is given for free, so I include it at the top of the file and try to proceed again. But at this stage, regardless of what C-compiler I try to build with (clang, gcc, tcc, chibicc, ...) I get variations of the same problem -- lots of files don't want to build because of implicit function use (which is possible to get past by manually setting the standard to std=c89 or overriding with the right -W flag but I still end up with the result being that we're missing output files, see below) or because I'm missing .o objects or whatever # sudo make lcc CC=gcc cc -g -c -o /host.o cc: fatal error: no input files compilation terminated. make: *** [makefile:128: /host.o] Error 1 # sudo make all CC=clang cpp/getopt.c:21:3: warning: add explicit braces to avoid dangling else [-Wdangling-else] 21 | else if (strcmp(argv[optind], "--") == 0) { | ^ 1 warning generated. clang -g -c -Icpp -o /unix.o cpp/unix.c clang -g -o /cpp /cpp.o /lexer.o /nlist.o /tokens.o /macro.o /eval.o /include.o /hideset.o /getopt.o /unix.o clang -g -c -o /host.o clang: error: no input files make: *** [makefile:128: /host.o] Error 1 So okay, let's try just running each of the make commands on their own. sudo make cpp sudo make bprint sudo make liblcc sudo make lburg sudo make rcc make: Nothing to be done for 'cpp'. make: Nothing to be done for 'bprint'. make: Nothing to be done for 'liblcc'. make: Nothing to be done for 'lburg'. make: Nothing to be done for 'rcc'. so those ones seem to work, but no matter what order I do the rest in, compilation fails, and the outputs generally look like sudo make triple cc -g -c -o /host.o cc: fatal error: no input files compilation terminated. make: *** [makefile:128: /host.o] Error 1 How am I supposed to build this? because make all doesn't work either cpp/getopt.c:21:3: warning: add explicit braces to avoid dangling else [-Wdangling-else] 21 | else if (strcmp(argv[optind], "--") == 0) { | ^ 1 warning generated. clang -g -c -Icpp -o /unix.o cpp/unix.c clang -g -o /cpp /cpp.o /lexer.o /nlist.o /tokens.o /macro.o /eval.o /include.o /hideset.o /getopt.o /unix.o clang -g -c -o /host.o clang: error: no input files make: *** [makefile:128: /host.o] Error 1 — Reply to this email directly, view it on GitHub <#53>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGSORE5IPL4SNI2H7DGHMHLZRF67NAVCNFSM6AAAAABMNLWF5SVHI2DSMVQWIX3LMV43ASLTON2WKOZSGQ3DEMZSGY2TGMQ> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[zqxyus]

Even setting environment variables still has error:
cc -g -c -o /host.o
cc: fatal error: no input files
compilation terminated.
make: *** [makefile:128: /host.o] Error 1

[pandasoli]

I found a way to compile using this repository, tho it was hard with the lack of documentation.

Changes in makefile:

CFLAGS=-g -std=c89         # Add -std=c89
TSTDIR=$(TARGET)/tst       # Remove $(BUILDDIR)/

Compile the project this way:

$ mkdir -p build/gcc
$ make BUILDDIR=build/gcc HOST=x86/linux TARGET=x86/linux HOSTFILE=etc/linux.c cpp

$ make BUILDDIR=build HOST=x86/linux TARGET=x86/linux HOSTFILE=etc/linux.c all

With this build/lcc is generated and you're ready to go.
This is how I managed to compile a file:

Note

I had to compile each step separately because lcc doesn't pass the flag --32 to as.

C file:

I had to declare the external functions myself as lcc isn't compatible with the preprocessor installed in my system.
I did so by running lcc with the flag -E and getting the definitions from what it outputs.

typedef signed long long int __int64_t;
typedef long int __off_t;
typedef __int64_t __off64_t;

typedef void _IO_lock_t;

struct _IO_FILE {
  int _flags;


  char *_IO_read_ptr;
  char *_IO_read_end;
  char *_IO_read_base;
  char *_IO_write_base;
  char *_IO_write_ptr;
  char *_IO_write_end;
  char *_IO_buf_base;
  char *_IO_buf_end;


  char *_IO_save_base;
  char *_IO_backup_base;
  char *_IO_save_end;

  struct _IO_marker *_markers;

  struct _IO_FILE *_chain;

  int _fileno;
  int _flags2:24;

  char _short_backupbuf[1];
  __off_t _old_offset;


  unsigned short _cur_column;
  signed char _vtable_offset;
  char _shortbuf[1];

  _IO_lock_t *_lock;
  __off64_t _offset;

  struct _IO_codecvt *_codecvt;
  struct _IO_wide_data *_wide_data;
  struct _IO_FILE *_freeres_list;
  void *_freeres_buf;
  struct _IO_FILE **_prevchain;
  int _mode;

  char _unused2[15 * sizeof (int) - 5 * sizeof (void *)];
};

typedef struct _IO_FILE FILE;


extern FILE *stdout;
extern int printf (const char * __format, ...);
extern int fflush (FILE *__stream);
main() {
	printf("hello\n");
	fflush(stdout);
	return 0;
}

$ ./build/lcc -Iinclude/x86/linux -Ux86 -Wo-lccdir=build -S -o main.s main.c

Manually add the _start label to the generated assembly:

_start:
    xorl %ebp, %ebp
    popl %eax
    movl %esp, %ebx
    leal 4(%ebx,%eax,4), %ecx
    andl $-16, %esp
    pushl %ecx
    pushl %ebx
    pushl %eax
    call main
    movl %eax, %ebx
    movl $1, %eax
    int $0x80
main:
; ...

$ as --32 -o main.o main.s
$ ld -m elf_i386 -dynamic-linker /lib64/ld-linux.so.2 -L/usr/lib32 -lc -o main main.o

Also remember to install the x86 compatibility layer on your system to run the program, if you're on arch:

$ sudo pacman -S lib32-glibc lib32-gcc-libs