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ldlinker-scripts
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Reputation: 87381

How to fail on non-empty sections in a GNU ld linker script?

I have this in my GNU ld linker script:

  .ctors : ALIGN(4) SUBALIGN(4) {
    *(.ctors)
    ASSERT(0, "Constructors (.ctors) are not supported.");
  }

In earlier versions of GNU ld (such as 2.24), this triggered the assertion only if the section .ctors was nonempty. In newer version, it always triggers the assertion. How do I trigger it only if .ctors is non-empty?

Upvotes: 0

Views: 178

Answers (1)

Freeman
Freeman

Reputation: 12748

In this example , the __ctors_start variable should be defined prior to being used in the section's definition.

.ctors : ALIGN(4) SUBALIGN(4) {
    *(.ctors)
    __ctors_end = .;
    __ctors_size = __ctors_end - __ctors_start;
    __ctors_start = .;
    ASSERT(__ctors_size == 0, "Constructors (.ctors) are not supported.");
}

This is an updated version of the linker script that properly defines __ctors_start before utilizing it in the section definition

.ctors : ALIGN(4) SUBALIGN(4) {
    __ctors_start = .;
    *(.ctors)
    __ctors_end = .;
    __ctors_size = __ctors_end - __ctors_start;
    ASSERT(__ctors_size == 0, "Constructors (.ctors) are not supported.");
}

good luck !

Upvotes: 1

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