Document more about cross-compilation; Post-build check for the actual arch of the artifact
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Kun Zhang
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@ -32,9 +32,19 @@ $ mvn install
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The Maven script will try to detect the OS and the architecture from Java
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system properties. It's possible to build a protoc binary for an architecture
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that is different from what Java has detected, as long as you have the proper
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compilers installed. For example, MingGW32 only ships with 32-bit compilers,
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but you can still build 32-bit protoc under a 64-bit system, with the following
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command:
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compilers installed.
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You can override the Maven properties ``os.detected.name`` and
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``os.detected.arch`` to force the script to generate binaries for a specific OS
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and/or architecture. Valid values are defined as the return values of
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``normalizeOs()`` and ``normalizeArch()`` of ``Detector`` from
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[os-maven-plugin](https://github.com/trustin/os-maven-plugin/blob/master/src/main/java/kr/motd/maven/os/Detector.java).
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Frequently used values are:
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- ``os.detected.name``: ``linux``, ``osx``, ``windows``.
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- ``os.detected.arch``: ``x86_32``, ``x86_64``
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For example, MingGW32 only ships with 32-bit compilers, but you can still build
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32-bit protoc under 64-bit Windows, with the following command:
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```
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$ mvn install -Dos.detected.arch=x86_32
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```
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@ -48,4 +58,3 @@ Use the following command to upload artifacts:
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```
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$ mvn clean deploy -P release
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```
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@ -7,6 +7,11 @@
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OS=$1
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ARCH=$2
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if [[ $# < 2 ]]; then
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echo "No arguments provided. This script is intended to be run from Maven."
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exit 1
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fi
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# Under Cygwin, bash doesn't have these in PATH when called from Maven which
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# runs in Windows version of Java.
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export PATH="/bin:/usr/bin:$PATH"
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@ -17,6 +22,7 @@ export PATH="/bin:/usr/bin:$PATH"
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E_PARAM_ERR=98
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E_ASSERT_FAILED=99
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# Usage:
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fail()
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{
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echo "Error: $1"
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@ -38,11 +44,45 @@ assertEq ()
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exit $E_ASSERT_FAILED
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fi
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}
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# Checks the artifact is for the expected architecture
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# Usage: checkArch <path-to-protoc>
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checkArch ()
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{
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if [[ "$OS" == windows || "$OS" == linux ]]; then
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format="$(objdump -f "$1" | grep -o "file format .*$" | grep -o "[^ ]*$")"
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if [[ "$OS" == linux ]]; then
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if [[ "$ARCH" == x86_32 ]]; then
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assertEq $format "elf32-i386" $LINENO
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elif [[ "$ARCH" == x86_64 ]]; then
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assertEq $format "elf64-x86-64" $LINENO
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else
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fail "Unsupported arch: $ARCH"
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fi
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else
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# $OS == windows
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if [[ "$ARCH" == x86_32 ]]; then
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assertEq $format "pei-i386" $LINENO
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elif [[ "$ARCH" == x86_64 ]]; then
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assertEq $format "pei-x86-64" $LINENO
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else
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fail "Unsupported arch: $ARCH"
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fi
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fi
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elif [[ "$OS" == osx ]]; then
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format="$(file -b "$1" | grep -o "[^ ]*$")"
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assertEq $format "x86_64" $LINENO
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else
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fail "Unsupported system: $(uname)"
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fi
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}
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############################################################################
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echo "Building protoc, OS=$OS ARCH=$ARCH"
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cd "$(dirname \"$0\")"
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# Nested double quotes are unintuitive, but it works.
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cd "$(dirname "$0")"
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WORKING_DIR=$(pwd)
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CONFIGURE_ARGS="--disable-shared"
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@ -51,6 +91,10 @@ if [[ "$OS" == windows ]]; then
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MAKE_TARGET="${MAKE_TARGET}.exe"
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fi
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# Override the default value set in configure.ac that has '-g' which produces
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# huge binary.
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CXXFLAGS="-DNDEBUG"
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if [[ "$(uname)" == CYGWIN* ]]; then
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assertEq "$OS" windows $LINENO
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# Use mingw32 compilers because executables produced by Cygwin compiler
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@ -68,11 +112,11 @@ elif [[ "$(uname)" == MINGW32* ]]; then
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elif [[ "$(uname)" == Linux* ]]; then
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assertEq "$OS" linux $LINENO
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if [[ "$ARCH" == x86_64 ]]; then
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CONFIGURE_ARGS="$CONFIGURE_ARGS --host=x86_64-linux-gnu"
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CXXFLAGS="$CXXFLAGS -m64"
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elif [[ "$ARCH" == x86_32 ]]; then
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CONFIGURE_ARGS="$CONFIGURE_ARGS --host=i686-linux-gnu"
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CXXFLAGS="$CXXFLAGS -m32"
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else
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fail "Unsupported arch by CYGWIN: $ARCH"
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fail "Unsupported arch: $ARCH"
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fi
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elif [[ "$(uname)" == Darwin* ]]; then
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assertEq "$OS" osx $LINENO
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@ -80,9 +124,7 @@ else
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fail "Unsupported system: $(uname)"
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fi
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# Override the default value set in configure.ac that has '-g' which produces
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# huge binary.
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export CXXFLAGS="-DNDEBUG"
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export CXXFLAGS
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# Statically link libgcc and libstdc++.
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# -s to produce stripped binary.
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@ -91,7 +133,10 @@ if [[ "$OS" != osx ]]; then
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export LDFLAGS="-static-libgcc -static-libstdc++ -s"
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fi
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TARGET_FILE=target/protoc.exe
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cd "$WORKING_DIR"/.. && ./configure $CONFIGURE_ARGS &&
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cd src && make clean && make $MAKE_TARGET &&
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cd "$WORKING_DIR" && mkdir -p target &&
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(cp ../src/protoc target/protoc.exe || cp ../src/protoc.exe target/protoc.exe)
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(cp ../src/protoc $TARGET_FILE || cp ../src/protoc.exe $TARGET_FILE) &&
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checkArch $TARGET_FILE
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