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README: Update "Prebuilt LLVM/Clang packages" section

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Fixes: QTCREATORBUG-22563
Change-Id: I651d0308bd5ac7efcb22f30488e08b3f3ffa16a6
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Robert Loehning <robert.loehning@qt.io>
This commit is contained in:
Nikolai Kosjar
2019-06-18 16:21:02 +02:00
parent c22e9cea13
commit a0852cf62b
1 changed files with 4 additions and 20 deletions
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README.md
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@@ -235,9 +235,10 @@ Prebuilt packages of LLVM/Clang can be downloaded from
https://download.qt.io/development_releases/prebuilt/libclang/
This should be your preferred option because you will use the version that is
shipped together with Qt Creator. In addition, MinGW packages for Windows are
faster due to profile-guided optimization. If the prebuilt packages do not
match your configuration, you need to build LLVM/Clang manually.
shipped together with Qt Creator (with backported/additional patches). In
addition, MinGW packages for Windows are faster due to profile-guided
optimization. If the prebuilt packages do not match your configuration, you
need to build LLVM/Clang manually.
If you use the MSVC compiler to build Qt Creator the suggested way is:
1. Download both MSVC and MinGW packages of libclang.
@@ -245,23 +246,6 @@ If you use the MSVC compiler to build Qt Creator the suggested way is:
3. Prepend PATH variable used for the run time with the location of MinGW version of libclang.dll.
4. Launch Qt Creator.
If you use GCC 5 or higher on Linux, please do not use our LLVM package, but get
the package for your distribution. Our LLVM package is compiled with GCC 4, so
you get linking errors, because GCC 5 is using a C++ 11 conforming string
implementation, which is not used by GCC 4. To sum it up, do not mix GCC 5 and
GCC 4 binaries. On Ubuntu, you can download the package from
http://apt.llvm.org/ with:
wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
sudo apt-add-repository "deb http://apt.llvm.org/`lsb_release -cs`/ llvm-toolchain-`lsb_release -cs`-8.0 main"
sudo apt-get update
sudo apt-get install llvm-8.0 libclang-8.0-dev
There is a workaround to set _GLIBCXX_USE_CXX11_ABI to 1 or 0, but we recommend
to download the package from http://apt.llvm.org/.
https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html
### Building LLVM/Clang manually
You need to install CMake in order to build LLVM/Clang.