[Lldb-commits] [lldb] Add support for reading the dynamic symbol table from PT_DYNAMIC (PR #116689)

[Greg Clayton via lldb-commits]

clayborg wrote:

@labath Your suggestion to use the commands in my test fails on `buildkite/github-pull-requests/linux-linux-x64` with:
```
RUN: at line 6: /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/bin/llvm-mc -triple=x86_64-pc-linux -filetype=obj    -o - - <<<".globl defined, undefined; defined:" |    /usr/bin/ld.lld /dev/stdin -o - --hash-style=gnu -export-dynamic -shared    -z nosectionheader -o /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/tools/lldb/test/Shell/ObjectFile/ELF/Output/elf-dynsym.test.tmp.gnu
+ /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/bin/llvm-mc -triple=x86_64-pc-linux -filetype=obj -o - -
+ /usr/bin/ld.lld /dev/stdin -o - --hash-style=gnu -export-dynamic -shared -z nosectionheader -o /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/tools/lldb/test/Shell/ObjectFile/ELF/Output/elf-dynsym.test.tmp.gnu
ld.lld: warning: unknown -z value: nosectionheader
RUN: at line 10: /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/bin/lldb --no-lldbinit -S /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/tools/lldb/test/Shell/lit-lldb-init-quiet /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/tools/lldb/test/Shell/ObjectFile/ELF/Output/elf-dynsym.test.tmp.gnu -b    -o "image dump objfile"    | /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/bin/FileCheck /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/lldb/test/Shell/ObjectFile/ELF/elf-dynsym.test --dump-input=always --check-prefix=GNU
+ /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/bin/lldb --no-lldbinit -S /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/tools/lldb/test/Shell/lit-lldb-init-quiet /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/tools/lldb/test/Shell/ObjectFile/ELF/Output/elf-dynsym.test.tmp.gnu -b -o 'image dump objfile'
+ /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/build/bin/FileCheck /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/lldb/test/Shell/ObjectFile/ELF/elf-dynsym.test --dump-input=always --check-prefix=GNU
/var/lib/buildkite-agent/builds/linux-56-59b8f5d88-5wwkv-1/llvm-project/github-pull-requests/lldb/test/Shell/ObjectFile/ELF/elf-dynsym.test:19:9: error: GNU: expected string not found in input
// GNU: e_shnum = 0x00000000
```
The error is:
```
ld.lld: warning: unknown -z value: nosectionheader
```
Any  ideas on why this flag doesn't work on that linux system? I would rather switch back to YAML where I strip the section headers if you don't have a solution for the way you suggested to do it.

https://github.com/llvm/llvm-project/pull/116689