platform_build_soong/soong.bash
Colin Cross 68f55102da Support dependencies on environment variables
Ninja can't depend on environment variables, so modifying build
behavior based on environment variables requires coordinating
between the soong script that invokes ninja and the soong_build
manifest generator.

Allow any module to call Config.Getenv to get the contents of an
environment variable while registering a dependency on it.
After all modules have been processed write out the state of
all used environment variables to a JSON file called
.soong.environment.  During the next build the soong script
will use the soong_env tool to compare the contents of
.soong.environment to the current environment, and force a
build manifest regeneration by deleting the .soong.environment
file if any variables have changed.

Change-Id: Id0d81933a857bc2fc1cd7a393a3c6cec73dc4824
2015-03-26 14:13:49 -07:00

47 lines
1.5 KiB
Bash
Executable file

#!/bin/bash
# Determine the build directory location based on the location of this script.
BPBUILD="${BASH_SOURCE[0]}"
BUILDDIR=`dirname "${BASH_SOURCE[0]}"`
BOOTSTRAP=${BUILDDIR}/.soong.bootstrap
# The source directory path and operating system will get written to
# .soong.bootstrap by the bootstrap script.
if [ ! -f ${BUILDDIR}/${BOOTSTRAP} ]; then
echo "Error: soong script must be located in a directory created by bootstrap.bash"
exit 1
fi
source ${BUILDDIR}/.soong.bootstrap
if [[ ${SRCDIR_IN:0:1} == '/' ]]; then
# SRCDIR_IN is an absolute path
SRCDIR=${SRCDIR_IN}
else
# SRCDIR_IN is a relative path
SRCDIR=${BUILDDIR}/${SRCDIR_IN}
fi
# Let Blueprint know that the Ninja we're using performs multiple passes that
# can regenerate the build manifest.
export BLUEPRINT_NINJA_HAS_MULTIPASS=1
# Ninja can't depend on environment variables, so do a manual comparison
# of the relevant environment variables from the last build using the
# soong_env tool and trigger a build manifest regeneration if necessary
ENVFILE=${BUILDDIR}/.soong.environment
ENVTOOL=${BUILDDIR}/.bootstrap/bin/soong_env
if [ -f ${ENVFILE} ]; then
if [ -x ${ENVTOOL} ]; then
if ! ${ENVTOOL} ${ENVFILE}; then
echo "forcing build manifest regeneration"
rm -f ${ENVFILE}
fi
else
echo "Missing soong_env tool, forcing build manifest regeneration"
rm -f ${ENVFILE}
fi
fi
${SRCDIR}/prebuilts/ninja/${PREBUILTOS}/ninja -C ${BUILDDIR} "$@"