QDoc uses Clang when parsing C++ files as well as function signatures in \fn commands. Clang is part of the LLVM Compiler Infrastructure Project . Therefore, if you are going to build QDoc from source, you need to install LLVM 6.0 or greater first. You can find the required pre-built binaries here .
To build QDoc on Debian-based Linux distributions, it is sufficient to install the
libclang-dev
package and its dependencies. For running QDoc, the
libclang
package is required.
The Qt build system uses the tool
llvm-config
to discover the location of LLVM on your system, and relies on the path to llvm-config being in the
PATH
environment variable to do so.
llvm-config
is commonly installed with LLVM and Clang on Linux systems, and also on
macOS
if LLVM is installed using Brew.
On Windows, the installation binaries provided by LLVM do not include
llvm-config
. You may still have it on your system, if you have built LLVM yourself from source. If that is the case, and you want to let the build system find Clang automatically, add the path to
llvm-config
to your
PATH
环境变量。例如：
C:\> set PATH=%PATH%;C:\[build directory]\bin\Release"
Make sure to set the path to your LLVM build directory. The
llvm-config
executable is located in
bin\Release
or
bin\Debug
, reflecting the build version.
若
llvm-config
is not in your
PATH
environment variable, or not installed on your system, you can still build QDoc, by manually setting the environment variable
LLVM_INSTALL_DIR
to point to the directory where the Clang libraries are installed. This directory should be the top level directory. For example, on a Linux or
macOS
system with LLVM installed to
/usr/llvm
:
$ export LLVM_INSTALL_DIR=/usr/llvm
Debian-based Linux distributions usually offer multiple versions of the
libclang
packages, such as
libclang-<VERSION>
. In this case,
LLVM_INSTALL_DIR
should contain
/usr/lib/clang/<VERSION>
.
On a Windows system with LLVM installed to
C:\Program Files\LLVM
:
C:\> set LLVM_INSTALL_DIR=C:\Program Files\LLVM
