danielandClaude Fable 5
1c851a3627
The GCC driver relocates its install prefix from argv[0]. crt1 hardcoded argv[0] as "prog", so make_relative_prefix cwd-joined it and computed exec prefixes relative to the current directory (0:/users/admin/../libexec/gcc/...), and because the computed gcc_exec_prefix is non-NULL the standard /sdk prefixes were never searched. cc1plus was unreachable from anywhere except (by accident of the path arithmetic) 0:/sdk/bin. sdk-diag proved the kernel and libc layers all worked; only the driver's self-relocation was lost. New SYS_GETEXECPATH (151) returns the absolute path the process was spawned from (Process::name); crt1 uses it for argv[0] with a "prog" fallback. With a real argv[0], make_relative_prefix computes 0:/sdk/bin/../libexec/gcc/ from any cwd. Native GCC relinked against the new crt1; sdk-diag ships in the SDK as a permanent probe; the montauk.h TCC mirror gains the wrapper (checker enforced it). Co-Authored-By: Claude Fable 5 <[email protected]>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/*
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* sdk-diag.c
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* Probes the exact libc/kernel layers the GCC driver depends on:
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* access/stat on the compiler backends, and a direct posix_spawn
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* of cc1plus. Prints one line per probe.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <spawn.h>
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#include <sys/wait.h>
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#define CC1PLUS "/sdk/libexec/gcc/x86_64-montauk/14.2.0/cc1plus"
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static void probe(const char *p) {
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struct stat st;
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int a = access(p, X_OK);
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int s = stat(p, &st);
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printf("%-52s access=%d stat=%d", p, a, s);
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if (s == 0) {
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printf(" mode=%o size=%ld", (unsigned)st.st_mode, (long)st.st_size);
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}
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printf("\n");
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}
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int main(void) {
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probe(CC1PLUS);
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probe("/sdk/libexec/gcc/x86_64-montauk/14.2.0");
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probe("/sdk/libexec/gcc");
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probe("/sdk/bin/as.elf");
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probe("/tmp");
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pid_t pid = -1;
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char *argv[] = { (char *)"cc1plus", (char *)"--version", 0 };
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int r = posix_spawn(&pid, CC1PLUS, 0, 0, argv, 0);
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printf("posix_spawn(cc1plus --version) = %d pid=%d\n", r, (int)pid);
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if (r == 0) {
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int st = -1;
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waitpid(pid, &st, 0);
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printf("cc1plus wait status = %d (exit %d)\n", st, (st >> 8) & 0xFF);
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}
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return 0;
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}
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