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8256182: Update qemu-debootstrap cross-compilation recipe

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Reviewed-by: ihse
This commit is contained in:
Aleksey Shipilev 2020-11-11 16:06:08 +00:00
parent 6247736fc9
commit 421a7c3b41
2 changed files with 52 additions and 27 deletions
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37
doc/building.html
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@ -629,21 +629,30 @@ cp: cannot stat `arm-linux-gnueabihf/libXt.so&#39;: No such file or directory</c
<p>Fortunately, you can create sysroots for foreign architectures with tools provided by your OS. On Debian/Ubuntu systems, one could use <code>qemu-deboostrap</code> to create the <em>target</em> system chroot, which would have the native libraries and headers specific to that <em>target</em> system. After that, we can use the cross-compiler on the <em>build</em> system, pointing into chroot to get the build dependencies right. This allows building for foreign architectures with native compilation speed.</p>
<p>For example, cross-compiling to AArch64 from x86_64 could be done like this:</p>
<ul>
<li>Install cross-compiler on the <em>build</em> system:</li>
</ul>
<pre><code>apt install g++-aarch64-linux-gnu gcc-aarch64-linux-gnu</code></pre>
<ul>
<li>Create chroot on the <em>build</em> system, configuring it for <em>target</em> system:</li>
</ul>
<pre><code>sudo qemu-debootstrap --arch=arm64 --verbose \
--include=fakeroot,build-essential,libx11-dev,libxext-dev,libxrender-dev,libxrandr-dev,libxtst-dev,libxt-dev,libcups2-dev,libfontconfig1-dev,libasound2-dev,libfreetype6-dev,libpng12-dev \
--resolve-deps jessie /chroots/arm64 http://httpredir.debian.org/debian/</code></pre>
<ul>
<li>Configure and build with newly created chroot as sysroot/toolchain-path:</li>
</ul>
<pre><code>CC=aarch64-linux-gnu-gcc CXX=aarch64-linux-gnu-g++ sh ./configure --openjdk-target=aarch64-linux-gnu --with-sysroot=/chroots/arm64/ --with-toolchain-path=/chroots/arm64/
<li><p>Install cross-compiler on the <em>build</em> system:</p>
<pre><code>apt install g++-aarch64-linux-gnu gcc-aarch64-linux-gnu</code></pre></li>
<li><p>Create chroot on the <em>build</em> system, configuring it for <em>target</em> system:</p>
<pre><code>sudo qemu-debootstrap \
--arch=arm64 \
--verbose \
--include=fakeroot,symlinks,build-essential,libx11-dev,libxext-dev,libxrender-dev,libxrandr-dev,libxtst-dev,libxt-dev,libcups2-dev,libfontconfig1-dev,libasound2-dev,libfreetype6-dev,libpng-dev \
--resolve-deps \
buster \
~/sysroot-arm64 \
http://httpredir.debian.org/debian/</code></pre></li>
<li><p>Make sure the symlinks inside the newly created chroot point to proper locations:</p>
<pre><code>sudo chroot ~/sysroot-arm64 symlinks -cr .</code></pre></li>
<li><p>Configure and build with newly created chroot as sysroot/toolchain-path:</p>
<pre><code>CC=aarch64-linux-gnu-gcc CXX=aarch64-linux-gnu-g++ sh ./configure \
--openjdk-target=aarch64-linux-gnu \
--with-sysroot=~/sysroot-arm64 \
--with-toolchain-path=~/sysroot-arm64 \
--with-freetype-lib=~/sysroot-arm64/usr/lib/aarch64-linux-gnu/ \
--with-freetype-include=~/sysroot-arm64/usr/include/freetype2/ \
--x-libraries=~/sysroot-arm64/usr/lib/aarch64-linux-gnu/
make images
ls build/linux-aarch64-normal-server-release/</code></pre>
ls build/linux-aarch64-server-release/</code></pre></li>
</ul>
<p>The build does not create new files in that chroot, so it can be reused for multiple builds without additional cleanup.</p>
<p>Architectures that are known to successfully cross-compile like this are:</p>
<table>

26
doc/building.md
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@ -1092,16 +1092,32 @@ apt install g++-aarch64-linux-gnu gcc-aarch64-linux-gnu
* Create chroot on the *build* system, configuring it for *target* system:
```
sudo qemu-debootstrap --arch=arm64 --verbose \
--include=fakeroot,build-essential,libx11-dev,libxext-dev,libxrender-dev,libxrandr-dev,libxtst-dev,libxt-dev,libcups2-dev,libfontconfig1-dev,libasound2-dev,libfreetype6-dev,libpng12-dev \
--resolve-deps jessie /chroots/arm64 http://httpredir.debian.org/debian/
sudo qemu-debootstrap \
--arch=arm64 \
--verbose \
--include=fakeroot,symlinks,build-essential,libx11-dev,libxext-dev,libxrender-dev,libxrandr-dev,libxtst-dev,libxt-dev,libcups2-dev,libfontconfig1-dev,libasound2-dev,libfreetype6-dev,libpng-dev \
--resolve-deps \
buster \
~/sysroot-arm64 \
http://httpredir.debian.org/debian/
```
* Make sure the symlinks inside the newly created chroot point to proper locations:
```
sudo chroot ~/sysroot-arm64 symlinks -cr .
```
* Configure and build with newly created chroot as sysroot/toolchain-path:
```
CC=aarch64-linux-gnu-gcc CXX=aarch64-linux-gnu-g++ sh ./configure --openjdk-target=aarch64-linux-gnu --with-sysroot=/chroots/arm64/ --with-toolchain-path=/chroots/arm64/
CC=aarch64-linux-gnu-gcc CXX=aarch64-linux-gnu-g++ sh ./configure \
--openjdk-target=aarch64-linux-gnu \
--with-sysroot=~/sysroot-arm64 \
--with-toolchain-path=~/sysroot-arm64 \
--with-freetype-lib=~/sysroot-arm64/usr/lib/aarch64-linux-gnu/ \
--with-freetype-include=~/sysroot-arm64/usr/include/freetype2/ \
--x-libraries=~/sysroot-arm64/usr/lib/aarch64-linux-gnu/
make images
ls build/linux-aarch64-normal-server-release/
ls build/linux-aarch64-server-release/
```
The build does not create new files in that chroot, so it can be reused for multiple builds