Make building for clang/libc++ simpler

[kristjanvalur]

Description

I need to compile on Linux to link with a project that uses clang and libc++ (rather than gcc and libstdc++)
It took me a few hours of googling and trial and error to figure out the solution.

Either it could be documented or made simpler via cmake config

When does the problem happen

• During build
• During run-time
• When capturing a hard crash

Environment
Ubuntu 18, with cmake 3.30

Steps To Reproduce

To successfully compile sentry-native, the following needs to be done:

1. Install prerequisites

• zlib-dev
• libssl-dev
• clang
• libc++-dev
• libc++abli-dev

2. run cmake with the following extra options:
   -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_FLAGS="-stdlib=libc++" -DCMAKE_EXE_LINKER_FLAGS="-stdlib=libc++"

[Swatinem]

I think this is rather something that should be documented on the libc++ side, as I bet this affects all c++ projects essentially.

[kristjanvalur]

I don't know, this SDK has a long list of compatible environments. I don't see a problem with giving build suggestions for various platforms and targets. I already found that the default instructions don't work on windows (see PR #528). Pre-requisited libs also _probably_ should be listed. I'll be happy to make a PR with suggested Linux additions. fim., 29. apr. 2021 kl. 10:26 skrifaði Arpad Borsos < ***@***.***>:

…

I think this is rather something that should be documented on the libc++ side, as I bet this affects all c++ projects essentially. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#531 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABN3FR2BXRRNJGDU27XUCXDTLEX5PANCNFSM43XMKIZQ> .

[madebr]

The easiest way to address your problem would be to use cmake toolchain files.

e.g. create a file names toolchain-clang-libcxx.cmake:

find_program(CMAKE_C_COMPILER NAMES clang)
find_program(CMAKE_CXX_COMPILER NAMES clang++)

set(CMAKE_CXX_FLAGS_INIT "-stdlib=libc++")
set(CMAKE_EXE_LINKER_FLAGS_INIT "-stdlib=libc++")
set(CMAKE_STARED_LINKER_FLAGS_INIT "-stdlib=libc++")

and build the project with:

cmake -S $path_to_sentry_native -B build -DCMAKE_TOOLCHAIN_FILE=/path/to/toolchain-clang-libcxx.cmake
cmake --build build --parallel

No changes need to be done to sentry-native's cmake scripts.