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[flang][nfc] Update README.md

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With https://reviews.llvm.org/D116731 merged, installing Clang, MLIR or
LLVM is no longer required for standalone builds. For consistency sake,
remove "installation" from the build instrucitons.

Differential Revision: https://reviews.llvm.org/D117100
This commit is contained in:
Andrzej Warzynski 2022-01-12 10:45:44 +00:00
parent 1e74e5e9e3
commit ea5ce2fc55
1 changed files with 9 additions and 24 deletions
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flang/README.md
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@ -37,14 +37,13 @@ If you are interested in writing new documentation, follow
[markdown style guide from LLVM](https://github.com/llvm/llvm-project/blob/main/llvm/docs/MarkdownQuickstartTemplate.md).
## Building flang
There are two ways to build flang. The first method is to build it at the same
time that you build all of the projects on which it depends. This is called
building in tree. The second method is to first do an in tree build to create
all of the projects on which flang depends, then build an install area for
these projects, and then only build the flang code itself. This is called
building standalone. Building standalone has the advantage of being smaller
and faster. Once you create the base build and base install areas, you can
create multiple standalone builds using them.
There are two ways to build flang. The first method is to build it at the same
time that you build all of the projects on which it depends. This is called
building in tree. The second method is to first do an in tree build to create
all of the projects on which flang depends, and then only build the flang code
itself. This is called building standalone. Building standalone has the
advantage of being smaller and faster. Once you create the base build and base
install areas, you can create multiple standalone builds using them.
Note that instructions for building LLVM can be found at
https://llvm.org/docs/GettingStarted.html.
@ -65,10 +64,8 @@ git clone https://github.com/llvm/llvm-project.git my-project
Once the clone is complete, execute the following commands:
```bash
cd my-project
INSTALLDIR=`pwd`/install
rm -rf build
rm -rf install
mkdir -p build
cd build
@ -93,12 +90,6 @@ directory:
ninja check-flang
```
If you're happy with the results, the next step is to create the install area.
While in the `build` directory, run the command:
```bash
ninja install
```
Note that these instructions specify flang as one of the projects to build in
the in tree build. This is not strictly necessary for subsequent standalone
builds, but doing so lets you run the flang tests to verify that the source
@ -129,18 +120,12 @@ cmake \
-DLLVM_BUILD_MAIN_SRC_DIR=$base/build/lib/cmake/llvm \
-DLLVM_LIT_ARGS=-v \
-DLLVM_DIR=$base/build/lib/cmake/llvm \
-DCLANG_DIR=$base/install/lib/cmake/clang \
-DMLIR_DIR=$base/install/lib/cmake/mlir \
-DCLANG_DIR=$base/build/lib/cmake/clang \
-DMLIR_DIR=$base/build/lib/cmake/mlir \
..
ninja
```
Note that for Clang and MLIR you use the installation directory ($base/install)
and for LLVM you use the build directory (`$base/build`). This is not a typo
in the script. Rather, it is because running the tests requires the GTest
infrastructure which is only available in the LLVM build area. The build also
requires the `AddClang.cmake` script from Clang, which is only available in the
install area.
To run the flang tests on this build, execute the command in the "flang/build"
directory: