| # REQUIRES: x86 |
| |
| # RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o |
| # RUN: echo '.globl foo; foo:' | llvm-mc -filetype=obj -triple=x86_64 - -o %t2.o |
| # RUN: rm -f %t2.a |
| # RUN: llvm-ar rcs %t2.a %t2.o |
| # RUN: ld.lld -shared %t2.o -o %t2.so |
| |
| ## A forward reference is accepted by a traditional Unix linker. |
| # RUN: ld.lld --fatal-warnings %t1.o %t2.a -o /dev/null |
| # RUN: ld.lld --fatal-warnings --warn-backrefs %t1.o %t2.a -o /dev/null |
| # RUN: ld.lld --fatal-warnings --warn-backrefs %t1.o --start-lib %t2.o --end-lib -o /dev/null |
| |
| # RUN: echo 'INPUT("%t1.o" "%t2.a")' > %t1.lds |
| # RUN: ld.lld --fatal-warnings --warn-backrefs %t1.lds -o /dev/null |
| |
| ## A backward reference from %t1.o to %t2.a |
| ## Warn unless the archive is excluded by --warn-backrefs-exclude |
| # RUN: ld.lld --fatal-warnings %t2.a %t1.o -o /dev/null |
| # RUN: ld.lld --warn-backrefs %t2.a %t1.o -o /dev/null 2>&1 | FileCheck %s |
| # RUN: ld.lld --warn-backrefs --no-warn-backrefs %t2.a %t1.o -o /dev/null 2>&1 | count 0 |
| # RUN: ld.lld --warn-backrefs %t2.a '-(' %t1.o '-)' -o /dev/null 2>&1 | FileCheck %s |
| # RUN: ld.lld --warn-backrefs --warn-backrefs-exclude='*3.a' %t2.a %t1.o -o /dev/null 2>&1 | FileCheck %s |
| # RUN: ld.lld --fatal-warnings --warn-backrefs --warn-backrefs-exclude='*2.a(*2.o)' %t2.a %t1.o -o /dev/null |
| # RUN: ld.lld --fatal-warnings --warn-backrefs --warn-backrefs-exclude '*2.a(*2.o)' \ |
| # RUN: --warn-backrefs-exclude not_exist %t2.a %t1.o -o /dev/null |
| ## Without --warn-backrefs, --warn-backrefs-exclude is ignored. |
| # RUN: ld.lld --fatal-warnings --warn-backrefs-exclude=not_exist %t2.a %t1.o -o /dev/null |
| |
| ## Placing the definition and the backward reference in a group can suppress the warning. |
| # RUN: echo 'GROUP("%t2.a" "%t1.o")' > %t2.lds |
| # RUN: ld.lld --fatal-warnings --warn-backrefs %t2.lds -o /dev/null |
| # RUN: ld.lld --fatal-warnings --warn-backrefs '-(' %t2.a %t1.o '-)' -o /dev/null |
| # RUN: ld.lld --fatal-warnings --warn-backrefs --start-group %t2.a %t1.o --end-group -o /dev/null |
| |
| ## A backward reference from %t1.o to %t2.a (added by %t3.lds). |
| # RUN: echo 'GROUP("%t2.a")' > %t3.lds |
| # RUN: ld.lld --warn-backrefs %t3.lds %t1.o -o /dev/null 2>&1 | FileCheck %s |
| # RUN: ld.lld --fatal-warnings --warn-backrefs '-(' %t3.lds %t1.o '-)' -o /dev/null |
| # RUN: ld.lld --fatal-warnings --warn-backrefs --warn-backrefs-exclude='*2.a(*2.o)' -o /dev/null %t3.lds %t1.o |
| ## If a lazy definition appears after the backward reference, don't warn. |
| # RUN: ld.lld --fatal-warnings --warn-backrefs %t3.lds %t1.o %t3.lds -o /dev/null |
| |
| # CHECK: warning: backward reference detected: foo in {{.*}}1.o refers to {{.*}}2.a |
| |
| ## A backward reference from %t1.o to %t2.o |
| ## --warn-backrefs-exclude= applies to --start-lib covered object files. |
| # RUN: ld.lld --warn-backrefs --start-lib %t2.o --end-lib %t1.o -o /dev/null 2>&1 | \ |
| # RUN: FileCheck --check-prefix=OBJECT %s |
| # RUN: ld.lld --fatal-warnings --warn-backrefs --warn-backrefs-exclude=%/t2.o --start-lib %/t2.o --end-lib %t1.o -o /dev/null |
| ## If a lazy definition appears after the backward reference, don't warn. |
| # RUN: ld.lld --fatal-warnings --warn-backrefs --start-lib %t2.o --end-lib %t1.o --start-lib %t2.o --end-lib -o /dev/null |
| |
| # OBJECT: warning: backward reference detected: foo in {{.*}}1.o refers to {{.*}}2.o |
| |
| ## Back reference from an fetched --start-lib to a previous --start-lib. |
| # RUN: ld.lld -m elf_x86_64 -u _start --warn-backrefs --start-lib %/t2.o --end-lib \ |
| # RUN: --start-lib %t1.o --end-lib -o /dev/null 2>&1 | FileCheck --check-prefix=OBJECT %s |
| ## --warn-backrefs-exclude=%/t2.o can be used for a fetched --start-lib. |
| # RUN: ld.lld --fatal-warnings -m elf_x86_64 -u _start --warn-backrefs --warn-backrefs-exclude=%/t2.o --start-lib %/t2.o --end-lib --start-lib %t1.o --end-lib -o /dev/null |
| |
| ## Don't warn if the definition and the backward reference are in a group. |
| # RUN: echo '.globl bar; bar:' | llvm-mc -filetype=obj -triple=x86_64 - -o %t3.o |
| # RUN: echo '.globl foo; foo: call bar' | llvm-mc -filetype=obj -triple=x86_64 - -o %t4.o |
| # RUN: ld.lld --fatal-warnings --warn-backrefs %t1.o --start-lib %t3.o %t4.o --end-lib -o /dev/null |
| |
| ## We don't report backward references to weak symbols as they can be overridden later. |
| # RUN: echo '.weak foo; foo:' | llvm-mc -filetype=obj -triple=x86_64 - -o %tweak.o |
| # RUN: ld.lld --fatal-warnings --warn-backrefs --start-lib %tweak.o --end-lib %t1.o %t2.o -o /dev/null |
| |
| ## Check common symbols. A common sym might later be replaced by a non-common definition. |
| # RUN: echo '.comm obj, 4' | llvm-mc -filetype=obj -triple=x86_64 -o %tcomm.o |
| # RUN: echo '.type obj,@object; .data; .globl obj; .p2align 2; obj: .long 55; .size obj, 4' | llvm-mc -filetype=obj -triple=x86_64 -o %tstrong.o |
| # RUN: echo '.globl foo; foo: movl obj(%rip), %eax' | llvm-mc -triple=x86_64 -filetype=obj -o %t5.o |
| # RUN: llvm-ar rcs %tcomm.a %tcomm.o |
| # RUN: llvm-ar rcs %tstrong.a %tstrong.o |
| # RUN: ld.lld --warn-backrefs %tcomm.a %t1.o %t5.o 2>&1 -o /dev/null | FileCheck --check-prefix=COMM %s |
| # RUN: ld.lld --fatal-warnings --warn-backrefs %tcomm.a %t1.o %t5.o %tstrong.a 2>&1 -o /dev/null |
| # RUN: ld.lld --warn-backrefs --no-fortran-common %tcomm.a %t1.o %t5.o %tstrong.a 2>&1 -o /dev/null | FileCheck --check-prefix=COMM %s |
| |
| # COMM: ld.lld: warning: backward reference detected: obj in {{.*}}5.o refers to {{.*}}comm.a |
| |
| ## If a lazy definition appears after the backward reference, don't warn. |
| ## A traditional Unix linker will resolve the reference to the later definition. |
| # RUN: ld.lld --fatal-warnings --warn-backrefs %t2.a %t1.o %t2.a -o /dev/null |
| |
| ## lld fetches the archive while GNU ld resolves the reference to the shared definition. |
| ## Warn because the resolution rules are different. |
| # RUN: ld.lld --warn-backrefs %t2.a %t1.o %t2.so -o /dev/null 2>&1 | FileCheck %s |
| |
| ## This is a limitation. The resolution rules are different but |
| ## --warn-backrefs does not warn. |
| # RUN: ld.lld --fatal-warnings --warn-backrefs %t2.a %t1.o %t2.so %t2.a -o /dev/null |
| |
| ## In GNU linkers, -u does not make a backward reference. |
| # RUN: ld.lld --fatal-warnings --warn-backrefs -u foo %t2.a %t1.o -o /dev/null |
| |
| ## -u does not make a backward reference. |
| # RUN: ld.lld --fatal-warnings --warn-backrefs -u foo %t2.a %t1.o -o /dev/null |
| |
| # RUN: not ld.lld --warn-backrefs-exclude='[' 2>&1 | FileCheck --check-prefix=INVALID %s |
| # INVALID: error: --warn-backrefs-exclude: invalid glob pattern: [ |
| |
| .globl _start, foo |
| _start: |
| call foo |