Refuses to build

[JohnAlexINL]

I have tried both just running the build/configure scripts, and I tried running the compiler directly like in the documentation (including telling it what standard to use). I've done gcc (shown), TinyCC, and clang.

~/Downloads/SubC $ ./configure

NOTE:
The signal() function of this port may cause handlers to segfault.
In this case, you can either
- uncomment the alternative signal() function in
  src/targets/linux-x86-64/crt0-linux-x86-64.s
  and set SYSLIBC to "/usr/lib/libc.a" in
  src/targets/linux-x86-64/sys-linux-x86-64.h
  (resulting in massively bloated executables)
- or, just not use signal() in your code, if that's an option.

Building for linux/x86-64. Now cd to src and run make.
~/Downloads/SubC $ cd src
~/Downloads/SubC/src $ make
cc -o scc0 cg.c decl.c error.c expr.c gen.c main.c misc.c opt.c prep.c scan.c stmt.c sym.c tree.c
In file included from cg.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
In file included from decl.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
decl.c: In function 'enumdecl':
decl.c:38:29: error: expected expression before 'constexpr'
   38 |                         v = constexpr();
      |                             ^~~~~~~~~
decl.c: In function 'initlist':
decl.c:80:21: error: expected expression before 'constexpr'
   80 |                 v = constexpr();
      |                     ^~~~~~~~~
decl.c: In function 'declarator':
decl.c:263:25: error: expected expression before 'constexpr'
  263 |                 *pval = constexpr();
      |                         ^~~~~~~~~
decl.c:311:34: error: expected expression before 'constexpr'
  311 |                         *psize = constexpr();
      |                                  ^~~~~~~~~
In file included from error.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
In file included from expr.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
expr.c:877:15: error: expected identifier or '(' before 'void'
  877 | int constexpr(void) {
      |               ^~~~
In file included from gen.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
In file included from main.c:10:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
In file included from misc.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
In file included from opt.c:9:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
In file included from prep.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
In file included from scan.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
In file included from stmt.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
stmt.c: In function 'switch_block':
stmt.c:218:36: error: expected expression before 'constexpr'
  218 |                         cval[nc] = constexpr();
      |                                    ^~~~~~~~~
stmt.c: In function 'wrong_ctx':
stmt.c:292:27: error: expected identifier or '(' before ')' token
  292 |                 constexpr();
      |                           ^
In file included from sym.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
In file included from tree.c:8:
decl.h:21:19: error: expected identifier or '(' before 'void'
   21 | int     constexpr(void);
      |                   ^~~~
make: *** [Makefile:48: scc0] Error 1

When I compiled myself and defined the standard c90 or c89 with gcc specifically, it did produce an executable, but one that segfaulted if actually run on anything.

~/Downloads/SubC/src $ ./scc0 -c lib/*.c
Segmentation fault

Moved onto looking at the make settings and changing things to see how far I could get that way, and that significantly helped.

~/Downloads/SubC/src $ make CC="gcc -std=c99"
gcc -std=c99 -o scc0 cg.c decl.c error.c expr.c gen.c main.c misc.c opt.c prep.c scan.c stmt.c sym.c tree.c
main.c: In function 'newfilename':
main.c:29:22: error: implicit declaration of function 'strdup'; did you mean 'strcmp'? [-Wimplicit-function-declaration]
   29 |         if ((ofile = strdup(file)) == NULL)
      |                      ^~~~~~
      |                      strcmp
main.c:29:20: error: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
   29 |         if ((ofile = strdup(file)) == NULL)
      |                    ^
make: *** [Makefile:48: scc0] Error 1

I tried just adding a simpe implementation of strdup into main before newfilename is called, re-ran the Makefile, and got what seemed like a pretty reasonable output. Decided to verify by trying to run scc0 on itself, and it failed but did not segfault; the self-created binary just did not want to actually work.

~/Downloads/SubC/src $ make CC="gcc -std=c99"
gcc -std=c99 -o scc0 cg.c decl.c error.c expr.c gen.c main.c misc.c opt.c prep.c scan.c stmt.c sym.c tree.c
as -o lib/crt0.o lib/crt0.s
sed -e '/C_init.*[;@#]INIT/d' \
    -e 's/\(.*\)Cexit\(.*\)EXIT/\1C_exit\2EXIT/' \
    <lib/crt0.s >lib/ncrt0.s
as -o lib/ncrt0.o lib/ncrt0.s
./scc0 -c lib/init.c
./scc0 -c lib/abort.c
./scc0 -c lib/abs.c
./scc0 -c lib/atexit.c
./scc0 -c lib/atoi.c
./scc0 -c lib/bsearch.c
./scc0 -c lib/calloc.c
./scc0 -c lib/clearerr.c
./scc0 -c lib/ctime.c
./scc0 -c lib/ctype.c
./scc0 -c lib/difftime.c
./scc0 -c lib/exit.c
./scc0 -c lib/fclose.c
./scc0 -c lib/fdopen.c
./scc0 -c lib/feof.c
./scc0 -c lib/ferror.c
./scc0 -c lib/fflush.c
./scc0 -c lib/fgetc.c
./scc0 -c lib/fgetpos.c
./scc0 -c lib/fgets.c
./scc0 -c lib/fileno.c
./scc0 -c lib/fopen.c
./scc0 -c lib/fprintf.c
./scc0 -c lib/fputc.c
./scc0 -c lib/fputs.c
./scc0 -c lib/fread.c
./scc0 -c lib/free.c
./scc0 -c lib/freopen.c
./scc0 -c lib/fscanf.c
./scc0 -c lib/fseek.c
./scc0 -c lib/fsetpos.c
./scc0 -c lib/ftell.c
./scc0 -c lib/fwrite.c
./scc0 -c lib/getchar.c
./scc0 -c lib/getenv.c
./scc0 -c lib/kprintf.c
./scc0 -c lib/malloc.c
./scc0 -c lib/memchr.c
./scc0 -c lib/memcmp.c
./scc0 -c lib/memcpy.c
./scc0 -c lib/memmove.c
./scc0 -c lib/memset.c
./scc0 -c lib/perror.c
./scc0 -c lib/printf.c
./scc0 -c lib/putchar.c
./scc0 -c lib/puts.c
./scc0 -c lib/qsort.c
./scc0 -c lib/rand.c
./scc0 -c lib/realloc.c
./scc0 -c lib/remove.c
./scc0 -c lib/rename.c
./scc0 -c lib/rewind.c
./scc0 -c lib/scanf.c
./scc0 -c lib/setbuf.c
./scc0 -c lib/setvbuf.c
./scc0 -c lib/sprintf.c
./scc0 -c lib/sscanf.c
./scc0 -c lib/strcat.c
./scc0 -c lib/strchr.c
./scc0 -c lib/strcmp.c
./scc0 -c lib/strcpy.c
./scc0 -c lib/strcspn.c
./scc0 -c lib/strdup.c
./scc0 -c lib/strerror.c
./scc0 -c lib/strlen.c
./scc0 -c lib/strncat.c
./scc0 -c lib/strncmp.c
./scc0 -c lib/strncpy.c
./scc0 -c lib/strpbrk.c
./scc0 -c lib/strrchr.c
./scc0 -c lib/strspn.c
./scc0 -c lib/strtok.c
./scc0 -c lib/strtol.c
./scc0 -c lib/system.c
./scc0 -c lib/time.c
./scc0 -c lib/tmpfile.c
./scc0 -c lib/tmpnam.c
./scc0 -c lib/ungetc.c
./scc0 -c lib/varargs.c
./scc0 -c lib/vformat.c
./scc0 -c lib/vfprintf.c
./scc0 -c lib/vprintf.c
./scc0 -c lib/vscan.c
./scc0 -c lib/vsprintf.c
ar -rc lib/libscc.a lib/init.o lib/abort.o lib/abs.o lib/atexit.o lib/atoi.o lib/bsearch.o lib/calloc.o lib/clearerr.o lib/ctime.o lib/ctype.o lib/difftime.o lib/exit.o lib/fclose.o lib/fdopen.o lib/feof.o lib/ferror.o lib/fflush.o lib/fgetc.o lib/fgetpos.o lib/fgets.o lib/fileno.o lib/fopen.o lib/fprintf.o lib/fputc.o lib/fputs.o lib/fread.o lib/free.o lib/freopen.o lib/fscanf.o lib/fseek.o lib/fsetpos.o lib/ftell.o lib/fwrite.o lib/getchar.o lib/getenv.o lib/kprintf.o lib/malloc.o lib/memchr.o lib/memcmp.o lib/memcpy.o lib/memmove.o lib/memset.o lib/perror.o lib/printf.o lib/putchar.o lib/puts.o lib/qsort.o lib/rand.o lib/realloc.o lib/remove.o lib/rename.o lib/rewind.o lib/scanf.o lib/setbuf.o lib/setvbuf.o lib/sprintf.o lib/sscanf.o lib/strcat.o lib/strchr.o lib/strcmp.o lib/strcpy.o lib/strcspn.o lib/strdup.o lib/strerror.o lib/strlen.o lib/strncat.o lib/strncmp.o lib/strncpy.o lib/strpbrk.o lib/strrchr.o lib/strspn.o lib/strtok.o lib/strtol.o lib/system.o lib/time.o lib/tmpfile.o lib/tmpnam.o lib/ungetc.o lib/varargs.o lib/vformat.o lib/vfprintf.o lib/vprintf.o lib/vscan.o lib/vsprintf.o
ranlib lib/libscc.a
~/Downloads/SubC/src $ ./scc0 -o scc1 *.c
~/Downloads/SubC/src $ ./scc1 -o scc *.c
/bin/sh: syntax error: unexpected "("
scc: assembler invocation failed

I'm not entirely sure where to go from here :/ Was hoping maybe I could patch this myself