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[ELF] --gc-sections: Change startwith(".init") (and ".fini") to exact match 

GNU ld's internal linker script keeps `.init`, but not other sections starting
with `.init`. .fini is similar.
This commit is contained in:
Fangrui Song 2021-12-15 01:16:25 -08:00
parent 7a54ae9c1d
commit 21dbfd4300
2 changed files with 17 additions and 6 deletions
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5
lld/ELF/MarkLive.cpp
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@ -178,9 +178,8 @@ static bool isReserved(InputSectionBase *sec) {
return !sec->nextInSectionGroup;
default:
StringRef s = sec->name;
return s.startswith(".ctors") || s.startswith(".dtors") ||
s.startswith(".init") || s.startswith(".fini") ||
s.startswith(".jcr");
return s == ".init" || s == ".fini" || s.startswith(".ctors") ||
s.startswith(".dtors") || s.startswith(".jcr");
}
}

18
lld/test/ELF/gc-sections.s
View File

@ -3,7 +3,7 @@
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
# RUN: ld.lld %t -o %t2
# RUN: llvm-readobj --sections --symbols %t2 | FileCheck -check-prefix=NOGC %s
# RUN: ld.lld --gc-sections %t -o %t2
# RUN: ld.lld --gc-sections --print-gc-sections %t -o %t2 | FileCheck --check-prefix=GC1-DISCARD %s
# RUN: llvm-readobj --sections --symbols %t2 | FileCheck -check-prefix=GC1 %s
# RUN: ld.lld --export-dynamic --gc-sections %t -o %t2
# RUN: llvm-readobj --sections --symbols %t2 | FileCheck -check-prefix=GC2 %s
@ -11,6 +11,7 @@
# NOGC: Name: .eh_frame
# NOGC: Name: .text
# NOGC: Name: .init
# NOGC: Name: .init_x
# NOGC: Name: .fini
# NOGC: Name: .tdata
# NOGC: Name: .tbss
@ -29,6 +30,14 @@
# NOGC: Name: y
# NOGC: Name: d
# GC1-DISCARD: removing unused section {{.*}}:(.text.d)
# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.text.x)
# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.text.y)
# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.tbss.f)
# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.tdata.h)
# GC1-DISCARD-NEXT: removing unused section {{.*}}:(.init_x)
# GC1-DISCARD-EMPTY:
# GC1: Name: .eh_frame
# GC1: Name: .text
# GC1: Name: .init
@ -124,10 +133,13 @@ h:
.section .dtors,"aw",@progbits
.quad 0
.section .init,"aw",@init_array
.section .init,"ax"
.quad 0
.section .fini,"aw",@fini_array
.section .init_x,"ax"
.quad 0
.section .fini,"ax"
.quad 0
.section .preinit_array,"aw",@preinit_array