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/*
This and the shell builder was originally written by
https://github.com/tpoechtrager but I had to modify both so that
they played nicely and were reproducible with nixpkgs. Much thanks
to MixRank for letting me work on this.
Edgar Aroutiounian <edgar.factorial@gmail.com>
*/
#ifndef TARGET_CPU
#define TARGET_CPU "armv7"
#endif
#ifndef OS_VER_MIN
#define OS_VER_MIN "4.2"
#endif
#ifndef NIX_APPLE_HDRS
#define NIX_APPLE_HDRS ""
#endif
#ifndef NIX_APPLE_FRAMEWORKS
#define NIX_APPLE_FRAMEWORKS ""
#endif
#ifndef NIX_APPLE_PRIV_FRAMEWORKS
#define NIX_APPLE_PRIV_FRAMEWORKS ""
#endif
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <limits.h>
#ifdef __APPLE__
#include <mach-o/dyld.h>
#endif
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
#include <sys/sysctl.h>
#endif
#ifdef __OpenBSD__
#include <sys/types.h>
#include <sys/user.h>
#include <sys/stat.h>
#endif
char *get_executable_path(char *epath, size_t buflen)
{
char *p;
#ifdef __APPLE__
unsigned int l = buflen;
if (_NSGetExecutablePath(epath, &l) != 0) return NULL;
#elif defined(__FreeBSD__) || defined(__DragonFly__)
int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
size_t l = buflen;
if (sysctl(mib, 4, epath, &l, NULL, 0) != 0) return NULL;
#elif defined(__OpenBSD__)
int mib[4];
char **argv;
size_t len;
size_t l;
const char *comm;
int ok = 0;
mib[0] = CTL_KERN;
mib[1] = KERN_PROC_ARGS;
mib[2] = getpid();
mib[3] = KERN_PROC_ARGV;
if (sysctl(mib, 4, NULL, &len, NULL, 0) < 0)
abort();
if (!(argv = malloc(len)))
abort();
if (sysctl(mib, 4, argv, &len, NULL, 0) < 0)
abort();
comm = argv[0];
if (*comm == '/' || *comm == '.') {
char *rpath;
if ((rpath = realpath(comm, NULL))) {
strlcpy(epath, rpath, buflen);
free(rpath);
ok = 1;
}
} else {
char *sp;
char *xpath = strdup(getenv("PATH"));
char *path = strtok_r(xpath, ":", &sp);
struct stat st;
if (!xpath)
abort();
while (path) {
snprintf(epath, buflen, "%s/%s", path, comm);
if (!stat(epath, &st) && (st.st_mode & S_IXUSR)) {
ok = 1;
break;
}
path = strtok_r(NULL, ":", &sp);
}
free(xpath);
}
free(argv);
if (!ok) return NULL;
l = strlen(epath);
#else
ssize_t l = readlink("/proc/self/exe", epath, buflen);
#endif
if (l <= 0) return NULL;
epath[buflen - 1] = '\0';
p = strrchr(epath, '/');
if (p) *p = '\0';
return epath;
}
char *get_filename(char *str)
{
char *p = strrchr(str, '/');
return p ? &p[1] : str;
}
void target_info(char *argv[], char **triple, char **compiler)
{
char *p = get_filename(argv[0]);
char *x = strrchr(p, '-');
if (!x) abort();
*compiler = &x[1];
*x = '\0';
*triple = p;
}
void env(char **p, const char *name, char *fallback)
{
char *ev = getenv(name);
if (ev) { *p = ev; return; }
*p = fallback;
}
int main(int argc, char *argv[])
{
char **args = alloca(sizeof(char*) * (argc + 17));
int i, j;
char execpath[PATH_MAX+1];
char sdkpath[PATH_MAX+1];
char codesign_allocate[64];
char osvermin[64];
char *compiler, *target, *sdk, *cpu, *osmin;
target_info(argv, &target, &compiler);
if (!get_executable_path(execpath, sizeof(execpath))) abort();
snprintf(sdkpath, sizeof(sdkpath), "%s/../SDK", execpath);
snprintf(codesign_allocate, sizeof(codesign_allocate),
"%s-codesign_allocate", target);
setenv("CODESIGN_ALLOCATE", codesign_allocate, 1);
setenv("IOS_FAKE_CODE_SIGN", "1", 1);
env(&sdk, "IOS_SDK_SYSROOT", sdkpath);
env(&cpu, "IOS_TARGET_CPU", TARGET_CPU);
env(&osmin, "IPHONEOS_DEPLOYMENT_TARGET", OS_VER_MIN);
unsetenv("IPHONEOS_DEPLOYMENT_TARGET");
snprintf(osvermin, sizeof(osvermin), "-miphoneos-version-min=%s", osmin);
for (i = 1; i < argc; ++i) {
if (!strcmp(argv[i], "-arch")) {
cpu = NULL;
break;
}
}
i = 0;
args[i++] = compiler;
args[i++] = "-target";
args[i++] = target;
args[i++] = "-isysroot";
args[i++] = sdk;
args[i++] = NIX_APPLE_HDRS;
args[i++] = "-F";
args[i++] = NIX_APPLE_FRAMEWORKS;
args[i++] = "-F";
args[i++] = NIX_APPLE_PRIV_FRAMEWORKS;
if (cpu) {
args[i++] = "-arch";
args[i++] = cpu;
}
args[i++] = osvermin;
args[i++] = "-mlinker-version=253.3";
for (j = 1; j < argc; ++i, ++j) args[i] = argv[j];
args[i] = NULL;
setenv("COMPILER_PATH", execpath, 1);
/* int k; */
/* for (k = 0; k < i; k++) */
/* printf("Compiler option: %s\n", args[k]); */
/* printf("End of Compiler args\n"); */
execvp(compiler, args);
fprintf(stderr, "cannot invoke compiler, this is a serious bug\n");
return 1;
}
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