Issues when trying to compile/build with cosmopolitan libc

[mingodad]

I understand that this use case is not the one intended by this project but it seems to reveal some edge cases when trying to compile/build with cosmopolitan libc (https://github.com/jart/cosmopolitan).

I manged to compile/build c2m using cosmopolitan libc with this shell script:

# run gcc compiler in freestanding mode
base_dir="mir-source-path"
do_compile() {
	gcc -g -Os -static -fno-pie -no-pie -nostdlib -nostdinc -pipe \
	  -fno-omit-frame-pointer -pg -mnop-mcount -mno-tls-direct-seg-refs \
	  -include cosmopolitan.h \
	  -DWHITHOUT_STD_HEADERS -I$base_dir \
	  -Wno-abi -fsigned-char -fno-tree-sra -fno-ipa-cp-clone -DxMIR_PARALLEL_GEN \
	  -c -o $2 $1
}
do_link() {
	gcc -g -Os -static -fno-pie -no-pie -nostdlib -nostdinc -pipe \
	  -fno-omit-frame-pointer -pg -mnop-mcount -mno-tls-direct-seg-refs \
	  -DBASECC='"$(GCC)"' \
	  -o $1.com.dbg $2 -Wl,--gc-sections -fuse-ld=bfd -Wl,--gc-sections \
	  -Wl,-T,ape.lds crt.o ape-no-modify-self.o cosmopolitan.a
	objcopy -S -O binary $1.com.dbg $1.com
}

do_compile $base_dir/mir.c mir.o
do_compile $base_dir/mir-gen.c mir-gen.o
do_compile $base_dir/c2mir/c2mir.c c2mir.o
do_compile $base_dir/c2mir/c2mir-driver.c c2mir-driver.o

do_link c2m "mir.o mir-gen.o c2mir.o c2mir-driver.o"

And adding a conditional macro wrapper around standard headers like this:

/* This file is a part of MIR project.
   Copyright (C) 2018-2021 Vladimir Makarov <vmakarov.gcc@gmail.com>.
*/

#ifndef MIR_H

#define MIR_H

#ifdef __cplusplus
extern "C" {
#endif

#if defined(_WIN32) && !defined(_WIN64)
#error "MIR does not work on 32-bit Windows"
#endif

#ifndef WHITHOUT_STD_HEADERS ///wrapper to conditionally exclude
#include <stdio.h>
#include <stdint.h>
#include <assert.h>
#endif ///wrapper end
#include "mir-dlist.h"
#include "mir-varr.h"
#include "mir-htab.h"

Then when I try to compile one example using cosmopolitan.h (even with the default c2m) I'm getting several warning/errors like:

./ape.elf ./c2m.com exprtk_functional_test-small.c
...
./cosmopolitan.h:363:25: syntax error on identifier (expected ';'):
./cosmopolitan.h:363:25: syntax error on identifier (expected '<declarator>'):
./cosmopolitan.h:375:23: syntax error on identifier (expected ';'):
./cosmopolitan.h:375:23: syntax error on identifier (expected '<declarator>'):
./cosmopolitan.h:395:9: syntax error on struct (expected '<declarator>'):
./cosmopolitan.h:1728:18: syntax error on const (expected 'identifier'):
./cosmopolitan.h:1728:18: syntax error on const (expected '<declarator>'):
./cosmopolitan.h:1944:16: syntax error on ( (expected '<declarator>'):
./cosmopolitan.h:1945:16: syntax error on ( (expected '<declarator>'):
./cosmopolitan.h:1947:12: syntax error on void (expected 'identifier'):
...

Test file:

#include "cosmopolitan.h"
int main(int argc, char *argv[]) { 
  printf("hello world\n");
  return 0;
}