1## Check that group members are retained or discarded as a unit. 2 3# REQUIRES: x86 4 5# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o 6# RUN: ld.lld %t.o --gc-sections -o %t 7# RUN: llvm-readelf -s %t | FileCheck %s 8 9# RUN: echo ".global __start___data; __start___data:" > %t2.s 10# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %t2.s -o %t2.o 11# RUN: ld.lld -shared %t2.o --soname=t2 -o %t2.so 12# RUN: ld.lld %t.o --gc-sections -o %t2 %t2.so 13# RUN: llvm-readelf -s %t2 | FileCheck %s 14 15## The referenced __data is retained. 16# CHECK: [[#%x,ADDR:]] {{.*}} __start___data 17# CHECK: [[#ADDR + 8]] {{.*}} __stop___data 18## __libc_atexit is retained even if there is no reference, as a workaround for 19## glibc<2.34 (BZ #27492). 20# CHECK: [[#%x,ADDR:]] {{.*}} __start___libc_atexit 21# CHECK: [[#ADDR + 8]] {{.*}} __stop___libc_atexit 22# CHECK: _start 23# CHECK: f 24# CHECK-NOT: g 25 26## If -z nostart-stop-gc, sections whose names are C identifiers are retained by 27## __start_/__stop_ references. 28# RUN: ld.lld %t.o %t2.so --gc-sections -z nostart-stop-gc -o %t3 29# RUN: llvm-readelf -s %t3 | FileCheck %s --check-prefix=NOGC 30# NOGC: [[#%x,ADDR:]] {{.*}} __start___data 31# NOGC: [[#ADDR + 16]] {{.*}} __stop___data 32 33.weak __start___data 34.weak __stop___data 35.weak __start___libc_atexit 36.weak __stop___libc_atexit 37 38.section .text,"ax",@progbits 39.global _start 40_start: 41 .quad __start___data - . 42 .quad __stop___data - . 43 .quad __start___libc_atexit - . 44 .quad __stop___libc_atexit - . 45 call f 46 47.section __data,"axG",@progbits,f 48.quad 0 49 50.section .text.f,"axG",@progbits,f 51.global f 52f: 53 nop 54 55.section __data,"axG",@progbits,g 56.quad 0 57 58.section .text.g,"axG",@progbits,g 59.global g 60g: 61 nop 62 63.section __libc_atexit,"a",@progbits 64.quad 0 65