Full bootstrap?

[Dawid33]

I really like this project, really amazing job.

In the 05/README.md it says to you can compile tcc with the tcc0 binary which works but when I run that command with the -MD flag the resulting file says that it uses a lot of system level headers / libraries. I think the musl build is more self contained so I built that and attempted to build tcc using tcc0 with the -nostdinc and -nostdlib flags without much luck.

The contents of tcc1.d after adding -MD (./tcc0 -MD tcc.c -o tcc1)

tcc1: \
 /usr/lib/x86_64-linux-gnu/crt1.o \
 /usr/lib/x86_64-linux-gnu/crti.o \
 tcc.c \
 tcc.h \
 config.h \
 /usr/include/stdlib.h \
 /usr/include/bits/libc-header-start.h \
 /usr/include/features.h \
 /usr/include/features-time64.h \
 /usr/include/bits/wordsize.h \
 /usr/include/bits/timesize.h \
 /usr/include/bits/wordsize.h \
 /usr/include/stdc-predef.h \
 /usr/include/sys/cdefs.h \
 /usr/include/bits/wordsize.h \
 /usr/include/bits/long-double.h \
 /usr/include/gnu/stubs.h \
 /usr/include/gnu/stubs-64.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/bits/waitflags.h \
 /usr/include/bits/waitstatus.h \
 /usr/include/bits/floatn.h \
 /usr/include/bits/floatn-common.h \
 /usr/include/bits/long-double.h \
 /usr/include/bits/types/locale_t.h \
 /usr/include/bits/types/__locale_t.h \
 /usr/include/sys/types.h \
 /usr/include/bits/types.h \
 /usr/include/bits/wordsize.h \
 /usr/include/bits/timesize.h \
 /usr/include/bits/wordsize.h \
 /usr/include/bits/typesizes.h \
 /usr/include/bits/time64.h \
 /usr/include/bits/types/clock_t.h \
 /usr/include/bits/types/clockid_t.h \
 /usr/include/bits/types/time_t.h \
 /usr/include/bits/types/timer_t.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/bits/stdint-intn.h \
 /usr/include/endian.h \
 /usr/include/bits/endian.h \
 /usr/include/bits/endianness.h \
 /usr/include/bits/byteswap.h \
 /usr/include/bits/uintn-identity.h \
 /usr/include/sys/select.h \
 /usr/include/bits/select.h \
 /usr/include/bits/types/sigset_t.h \
 /usr/include/bits/types/__sigset_t.h \
 /usr/include/bits/types/struct_timeval.h \
 /usr/include/bits/types/struct_timespec.h \
 /usr/include/bits/pthreadtypes.h \
 /usr/include/bits/thread-shared-types.h \
 /usr/include/bits/pthreadtypes-arch.h \
 /usr/include/bits/wordsize.h \
 /usr/include/bits/atomic_wide_counter.h \
 /usr/include/bits/struct_mutex.h \
 /usr/include/bits/struct_rwlock.h \
 /usr/include/alloca.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/bits/stdlib-float.h \
 /usr/include/stdio.h \
 /usr/include/bits/libc-header-start.h \
 ../tcc-bootstrap/include/stddef.h \
 ../tcc-bootstrap/include/stdarg.h \
 /usr/include/bits/types/__fpos_t.h \
 /usr/include/bits/types/__mbstate_t.h \
 /usr/include/bits/types/__fpos64_t.h \
 /usr/include/bits/types/__FILE.h \
 /usr/include/bits/types/FILE.h \
 /usr/include/bits/types/struct_FILE.h \
 /usr/include/bits/types/cookie_io_functions_t.h \
 /usr/include/bits/stdio_lim.h \
 /usr/include/string.h \
 /usr/include/bits/libc-header-start.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/strings.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/errno.h \
 /usr/include/bits/errno.h \
 /usr/include/linux/errno.h \
 /usr/include/asm/errno.h \
 /usr/include/asm-generic/errno.h \
 /usr/include/asm-generic/errno-base.h \
 /usr/include/bits/types/error_t.h \
 /usr/include/math.h \
 /usr/include/bits/libc-header-start.h \
 /usr/include/bits/math-vector.h \
 /usr/include/bits/libm-simd-decl-stubs.h \
 /usr/include/bits/flt-eval-method.h \
 /usr/include/bits/fp-logb.h \
 /usr/include/bits/fp-fast.h \
 /usr/include/bits/mathcalls-helper-functions.h \
 /usr/include/bits/mathcalls.h \
 /usr/include/bits/mathcalls-helper-functions.h \
 /usr/include/bits/mathcalls.h \
 /usr/include/bits/mathcalls-helper-functions.h \
 /usr/include/bits/mathcalls.h \
 /usr/include/bits/mathcalls.h \
 /usr/include/bits/mathcalls.h \
 /usr/include/bits/mathcalls.h \
 /usr/include/bits/mathcalls.h \
 /usr/include/bits/mathcalls-narrow.h \
 /usr/include/bits/mathcalls-narrow.h \
 /usr/include/bits/mathcalls-narrow.h \
 /usr/include/bits/mathcalls-narrow.h \
 /usr/include/bits/mathcalls-narrow.h \
 /usr/include/bits/mathcalls-narrow.h \
 /usr/include/bits/mathcalls-narrow.h \
 /usr/include/bits/mathcalls-narrow.h \
 /usr/include/bits/mathcalls-narrow.h \
 /usr/include/bits/iscanonical.h \
 ../tcc-bootstrap/include/float.h \
 /usr/include/fcntl.h \
 /usr/include/bits/fcntl.h \
 /usr/include/bits/fcntl-linux.h \
 /usr/include/bits/types/struct_iovec.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/linux/falloc.h \
 /usr/include/bits/stat.h \
 /usr/include/bits/struct_stat.h \
 /usr/include/setjmp.h \
 /usr/include/bits/setjmp.h \
 /usr/include/bits/wordsize.h \
 /usr/include/bits/types/struct___jmp_buf_tag.h \
 /usr/include/time.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/bits/time.h \
 /usr/include/bits/timex.h \
 /usr/include/bits/types/struct_tm.h \
 /usr/include/bits/types/struct_itimerspec.h \
 /usr/include/unistd.h \
 /usr/include/bits/posix_opt.h \
 /usr/include/bits/environments.h \
 /usr/include/bits/wordsize.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/bits/confname.h \
 /usr/include/bits/getopt_posix.h \
 /usr/include/bits/getopt_core.h \
 /usr/include/bits/unistd_ext.h \
 /usr/include/sys/time.h \
 libtcc.h \
 elf.h \
 stab.h \
 stab.def \
 x86_64-gen.c \
 x86_64-link.c \
 tcctok.h \
 libtcc.c \
 tccpp.c \
 tcctok.h \
 tccgen.c \
 tccelf.c \
 tccrun.c \
 /usr/include/sys/mman.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/bits/mman.h \
 /usr/include/bits/mman-map-flags-generic.h \
 /usr/include/bits/mman-linux.h \
 /usr/include/bits/mman-shared.h \
 /usr/include/signal.h \
 /usr/include/bits/signum-generic.h \
 /usr/include/bits/signum-arch.h \
 /usr/include/bits/types/sig_atomic_t.h \
 /usr/include/bits/types/siginfo_t.h \
 /usr/include/bits/wordsize.h \
 /usr/include/bits/types/__sigval_t.h \
 /usr/include/bits/siginfo-arch.h \
 /usr/include/bits/siginfo-consts.h \
 /usr/include/bits/siginfo-consts-arch.h \
 /usr/include/bits/types/sigval_t.h \
 /usr/include/bits/types/sigevent_t.h \
 /usr/include/bits/wordsize.h \
 /usr/include/bits/sigevent-consts.h \
 /usr/include/bits/sigaction.h \
 /usr/include/bits/sigcontext.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/bits/types/stack_t.h \
 ../tcc-bootstrap/include/stddef.h \
 /usr/include/sys/ucontext.h \
 /usr/include/bits/sigstack.h \
 /usr/include/bits/sigstksz.h \
 /usr/include/bits/ss_flags.h \
 /usr/include/bits/types/struct_sigstack.h \
 /usr/include/bits/sigthread.h \
 /usr/include/bits/signal_ext.h \
 x86_64-gen.c \
 /usr/include/assert.h \
 x86_64-link.c \
 i386-asm.c \
 x86_64-asm.h \
 x86_64-asm.h \
 tccasm.c \
 tcctools.c \
 /usr/lib/x86_64-linux-gnu/libc.so \
 /lib/x86_64-linux-gnu/libc.so.6 \
 /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 \
 /usr/lib/x86_64-linux-gnu/libc_nonshared.a \
 /lib/x86_64-linux-gnu/libc.so.6 \
 /usr/lib/x86_64-linux-gnu/libc_nonshared.a \
 ../tcc-bootstrap/libtcc1.a \
 /usr/lib/x86_64-linux-gnu/crtn.o \

Here is what I did. I really just commented out one thing the config.h and added a few flags here. The rest of the changes are to make it slightly easier to compile. It fails with this error

The error.

cd tcc-0.9.27 && ./tcc0 -nostdinc -nostdlib -B ../tcc-boostrap -L../musl-bootstrap/lib -lc -I ../musl-bootstrap/include tcc.c -o tcc1
In file included from tcc.c:21:
In file included from tcc.h:293:
elf.h:43: error: ';' expected (got "Elf32_Half")
Error: Tried to longjmp from libtcc.c:548 with value 1

And the offending file.

if you revert those two lines then it works again but it links against the system libc files. I'm not very good with this stuff so I just wanted to ask if you tried something like this already or if I'm missing something obvious.

[pommicket]

You just need a few modifications to tcc's source to get this to work: see 3384d69

The build command

./tcc0 -nostdinc -nostdlib -B ../tcc-boostrap -I ../musl-bootstrap/include tcc.c ../musl-bootstrap/lib/*.[oa] -o tcc1

works after those modifications. And adding -MD reveals that the build is entirely self-contained:

tcc1: \
 tcc.c \
 tcc.h \
 config.h \
 ../musl-bootstrap/include/stdlib.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 ../musl-bootstrap/include/stdarg.h \
 ../musl-bootstrap/include/bits/wexitstatus.h \
 ../musl-bootstrap/include/stdio.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 ../musl-bootstrap/include/string.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 ../musl-bootstrap/include/errno.h \
 ../musl-bootstrap/include/bits/errno.h \
 ../musl-bootstrap/include/math.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 ../musl-bootstrap/include/float.h \
 ../musl-bootstrap/include/bits/float.h \
 ../musl-bootstrap/include/fcntl.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 ../musl-bootstrap/include/bits/fcntl.h \
 ../musl-bootstrap/include/setjmp.h \
 ../musl-bootstrap/include/bits/setjmp.h \
 ../musl-bootstrap/include/time.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 ../musl-bootstrap/include/unistd.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 ../musl-bootstrap/include/bits/posix.h \
 ../musl-bootstrap/include/sys/time.h \
 ../musl-bootstrap/include/sys/select.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 libtcc.h \
 elf.h \
 ../musl-bootstrap/include/inttypes.h \
 ../musl-bootstrap/include/stdint.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 ../musl-bootstrap/include/bits/stdint.h \
 ../musl-bootstrap/include/bits/alltypes.h \
 stab.h \
 stab.def \
 x86_64-gen.c \
 x86_64-link.c \
 tcctok.h \
 libtcc.c \
 tccpp.c \
 tcctok.h \
 tccgen.c \
 tccelf.c \
 tccrun.c \
 x86_64-gen.c \
 ../musl-bootstrap/include/assert.h \
 x86_64-link.c \
 i386-asm.c \
 x86_64-asm.h \
 x86_64-asm.h \
 tccasm.c \
 tcctools.c \
 ../musl-bootstrap/lib/libc.a \
 ../musl-bootstrap/lib/crt1.o \
 ../musl-bootstrap/lib/crti.o \
 ../musl-bootstrap/lib/crtn.o \

Though I think even with this building gcc or glibc in a fully self-contained way will be very difficult...

Anyways I'm glad you like this project! I had a lot of fun making it :)

[Dawid33]

Thank you! My goal was to compile lua with that tcc + musl combination and I got it working so I'm happy with that. Building gcc or glibc would require a functional c++ compiler among other things so trying to bootstrap a gnu environment is very hard.