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fix: real argv[0] via SYS_GETEXECPATH - GCC driver finds its backends

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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]>
This commit is contained in:
daniel
2026-07-17 10:43:59 +02:00
co-authored by Claude Fable 5
parent 2f1010b02e
commit 1c851a3627
12 changed files with 83 additions and 6 deletions
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programs/GNUmakefile
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@@ -405,6 +405,7 @@ ifneq ($(wildcard $(NATIVE_BIN)/as),)
cp -r ../toolchain/local/x86_64-montauk/include/c++ $(BINDIR)/sdk/include/c++
../toolchain/local/bin/x86_64-montauk-gcc -O2 ../toolchain/files/tls-test.c -o $(BINDIR)/sdk/bin/tls-test.elf
../toolchain/local/bin/x86_64-montauk-g++ -O2 ../toolchain/files/cxx-test.cpp -o $(BINDIR)/sdk/bin/cxx-test.elf
../toolchain/local/bin/x86_64-montauk-gcc -O2 ../toolchain/files/sdk-diag.c -o $(BINDIR)/sdk/bin/sdk-diag.elf
ifneq ($(wildcard ../toolchain/native-gcc/sdk/bin/gcc),)
cp ../toolchain/native-gcc/sdk/bin/gcc $(BINDIR)/sdk/bin/gcc.elf
cp ../toolchain/native-gcc/sdk/bin/g++ $(BINDIR)/sdk/bin/g++.elf