| ## Check that group members are retained or discarded as a unit. |
| |
| # REQUIRES: x86 |
| |
| # RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o |
| # RUN: ld.lld %t.o --gc-sections -o %t |
| # RUN: llvm-readelf -s %t | FileCheck %s |
| |
| # RUN: echo ".global __start___data; __start___data:" > %t2.s |
| # RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %t2.s -o %t2.o |
| # RUN: ld.lld -shared %t2.o --soname=t2 -o %t2.so |
| # RUN: ld.lld %t.o --gc-sections -o %t2 %t2.so |
| # RUN: llvm-readelf -s %t2 | FileCheck %s |
| |
| ## The referenced __data is retained. |
| # CHECK: [[#%x,ADDR:]] {{.*}} __start___data |
| # CHECK: [[#ADDR + 8]] {{.*}} __stop___data |
| ## __libc_atexit is retained even if there is no reference, as a workaround for |
| ## glibc<2.34 (BZ #27492). |
| # CHECK: [[#%x,ADDR:]] {{.*}} __start___libc_atexit |
| # CHECK: [[#ADDR + 8]] {{.*}} __stop___libc_atexit |
| # CHECK: _start |
| # CHECK: f |
| # CHECK-NOT: g |
| |
| ## If -z nostart-stop-gc, sections whose names are C identifiers are retained by |
| ## __start_/__stop_ references. |
| # RUN: ld.lld %t.o %t2.so --gc-sections -z nostart-stop-gc -o %t3 |
| # RUN: llvm-readelf -s %t3 | FileCheck %s --check-prefix=NOGC |
| # NOGC: [[#%x,ADDR:]] {{.*}} __start___data |
| # NOGC: [[#ADDR + 16]] {{.*}} __stop___data |
| |
| .weak __start___data |
| .weak __stop___data |
| .weak __start___libc_atexit |
| .weak __stop___libc_atexit |
| |
| .section .text,"ax",@progbits |
| .global _start |
| _start: |
| .quad __start___data - . |
| .quad __stop___data - . |
| .quad __start___libc_atexit - . |
| .quad __stop___libc_atexit - . |
| call f |
| |
| .section __data,"axG",@progbits,f |
| .quad 0 |
| |
| .section .text.f,"axG",@progbits,f |
| .global f |
| f: |
| nop |
| |
| .section __data,"axG",@progbits,g |
| .quad 0 |
| |
| .section .text.g,"axG",@progbits,g |
| .global g |
| g: |
| nop |
| |
| .section __libc_atexit,"a",@progbits |
| .quad 0 |