forked from OSchip/llvm-project
e4e7e44765
This is part of PR44213 https://bugs.llvm.org/show_bug.cgi?id=44213 When importing (system) Clang modules, LLDB needs to know which SDK (e.g., MacOSX, iPhoneSimulator, ...) they came from. While the sysroot attribute contains the absolute path to the SDK, this doesn't work well when the debugger is run on a different machine than the compiler, and the SDKs are installed in different directories. It thus makes sense to just store the name of the SDK instead of the absolute path, so it can be found relative to LLDB. rdar://problem/51645582 Differential Revision: https://reviews.llvm.org/D75646 |
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| .. | ||
| llvm | ||
| README.txt | ||
| build.sh | ||
| conftest.go | ||
README.txt
This directory contains LLVM bindings for the Go programming language
(http://golang.org).
Prerequisites
-------------
* Go 1.2+.
* CMake (to build LLVM).
Using the bindings
------------------
The package path "llvm.org/llvm/bindings/go/llvm" can be used to
import the latest development version of LLVM from SVN. Paths such as
"llvm.org/llvm.v36/bindings/go/llvm" refer to released versions of LLVM.
It is recommended to use the "-d" flag with "go get" to download the
package or a dependency, as an additional step is required to build LLVM
(see "Building LLVM" below).
Building LLVM
-------------
The script "build.sh" in this directory can be used to build LLVM and prepare
it to be used by the bindings. If you receive an error message from "go build"
like this:
./analysis.go:4:84: fatal error: llvm-c/Analysis.h: No such file or directory
#include <llvm-c/Analysis.h> // If you are getting an error here read bindings/go/README.txt
or like this:
./llvm_dep.go:5: undefined: run_build_sh
it means that LLVM needs to be built or updated by running the script.
$ $GOPATH/src/llvm.org/llvm/bindings/go/build.sh
Any command line arguments supplied to the script are passed to LLVM's CMake
build system. A good set of arguments to use during development are:
$ $GOPATH/src/llvm.org/llvm/bindings/go/build.sh -DCMAKE_BUILD_TYPE=Debug -DLLVM_TARGETS_TO_BUILD=host -DBUILD_SHARED_LIBS=ON
Note that CMake keeps a cache of build settings so once you have built
LLVM there is no need to pass these arguments again after updating.
Alternatively, you can build LLVM yourself, but you must then set the
CGO_CPPFLAGS, CGO_CXXFLAGS and CGO_LDFLAGS environment variables:
$ export CGO_CPPFLAGS="`/path/to/llvm-build/bin/llvm-config --cppflags`"
$ export CGO_CXXFLAGS=-std=c++14
$ export CGO_LDFLAGS="`/path/to/llvm-build/bin/llvm-config --ldflags --libs --system-libs all`"
$ go build -tags byollvm
If you see a compilation error while compiling your code with Go 1.9.4 or later as follows,
go build llvm.org/llvm/bindings/go/llvm: invalid flag in #cgo LDFLAGS: -Wl,-headerpad_max_install_names
you need to setup $CGO_LDFLAGS_ALLOW to allow a compiler to specify some linker options:
$ export CGO_LDFLAGS_ALLOW='-Wl,(-search_paths_first|-headerpad_max_install_names)'