71c4b8dfe1
This works with glibc crt1.o (its crt1.o is essentially Scrt1.o plus (if static PIE is supported for the arch) _dl_relocate_static_pie) but looks wacky. musl crt1.o is not built with an explicit -fno-pic/-fpie/-fpic. If it was built with a non-default-pie GCC/Clang, the linker might complain about absolute relocations referencing _init/_fini for the -pie link: ``` ld: error: relocation R_X86_64_32 cannot be used against symbol '_fini'; recompile with -fPIC >>> defined in obj/crt/crt1.o >>> referenced by crt1.c >>> obj/crt/crt1.o:(_start_c) ```
42 lines
974 B
C
42 lines
974 B
C
// RUN: %clang -fno-use-init-array -g -c %s -o %t.o
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// RUN: %clang -o %t -no-pie -nostdlib %crt1 %crti %crtbegin %t.o -lc %libgcc %crtend %crtn
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// RUN: %run %t 2>&1 | FileCheck %s
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#include <stdio.h>
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#include <stdlib.h>
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// Ensure the various startup functions are called in the proper order.
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// CHECK: __register_frame_info()
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/// ctor() is here if ld.so/libc supports DT_INIT/DT_FINI
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// CHECK: main()
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/// dtor() is here if ld.so/libc supports DT_INIT/DT_FINI
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// CHECK: __deregister_frame_info()
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struct object;
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static int counter;
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void __register_frame_info(const void *fi, struct object *obj) {
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printf("__register_frame_info()\n");
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}
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void __deregister_frame_info(const void *fi) {
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printf("__deregister_frame_info()\n");
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}
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void __attribute__((constructor)) ctor() {
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printf("ctor()\n");
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++counter;
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}
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void __attribute__((destructor)) dtor() {
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printf("dtor()\n");
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if (--counter != 0)
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abort();
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}
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int main() {
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printf("main()\n");
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return 0;
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}
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