https://bugs.llvm.org/show_bug.cgi?id=33407
Bug ID: 33407
Summary: ARM: .ARM.extab sections not merged
Product: lld
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: compn...@compnerd.org
CC: llvm-bugs@lists.llvm.org
With `-ffunction-sections`, the `.ARM.extab` section entry is split around the
function boundaries. The linker needs to coalesce them into a single
`.ARM.extab` section. The ordering is important since the entries in the
`.ARM.extab` section are referenced from `.ARM.exidx` via the special
`ARM_PREL31` relocation type.
// RUN: %clang -target armv7-unknown-linux-gnueabi -ffunction-sections -c %s -o
- | %lld -shared - -o - | llvm-readobj -elf-output-style GNU -S -
int f();
int g() {
try {
return f();
} catch (...) {
return 1;
}
}
int h();
int i() {
try {
return h();
} catch (...) {
return 2;
}
}
ld.bfd:
[ 7] .ARM.extab PROGBITS 0000038c 00038c 000060 00 A 0 0
4
ld.gold:
[ 7] .ARM.extab PROGBITS 00000324 000324 000060 00 A 0 0
4
ld.lld:
[ 1] .ARM.extab.text._Z1gv PROGBITS 00000134 000134 000030 00 A 0
0 4
[ 3] .ARM.extab.text._Z1iv PROGBITS 0000017c 00017c 000030 00 A 0
0 4
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