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[GCC toolchain builder] Provide means of throttling parallel builds. (#1680)

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Zbigniew Chamski 2023-12-07 10:04:33 +01:00 • committed by GitHub
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8
README.md
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@ -162,6 +162,14 @@ located under `util/gcc-toolchain-builder`. Please make sure beforehand that yo
installed all the required *toolchain build* dependencies (see installed all the required *toolchain build* dependencies (see
[the toolchain README file](file:util/gcc-toolchain-builder/README.md).) [the toolchain README file](file:util/gcc-toolchain-builder/README.md).)
To control the load of your host machine when building the toolchain, you can use
the environment variable `NUM_JOBS` to limit the number of concurrent jobs launched
by `make`:
- if left undefined, `NUM_JOBS` will default to 1, resulting in a sequential execution
of `make` jobs;
- when setting `NUM_JOBS` to an explicit value, it is recommended not to exceed 2/3 of
the total nuber of virtual cores available on your system.
```sh ```sh
# Set environment variable RISCV to the desired installation location. # Set environment variable RISCV to the desired installation location.
# The toolchain can be installed in any user-writable directory. # The toolchain can be installed in any user-writable directory.

14
util/gcc-toolchain-builder/build-toolchain.sh
View file

@ -37,6 +37,12 @@ ROOT_DIR=$(dirname $(readlink -f $0))
# Builds of individual tools are performed under the matching # Builds of individual tools are performed under the matching
# build/... subdirectories # build/... subdirectories
# Provide a means of throttling parallel 'make' executions.
# Use a conservative setting to avoid overloading the host machine.
if [ -z "$NUM_JOBS" ]; then
NUM_JOBS=1
fi
# Helper function to print usage information. # Helper function to print usage information.
print_usage() print_usage()
{ {
@ -163,7 +169,7 @@ cd $ROOT_DIR/build/binutils-gdb
{ echo "Could not configure binutils-gdb, bailing out!" ; \ { echo "Could not configure binutils-gdb, bailing out!" ; \
exit 2 ; } ; } && \ exit 2 ; } ; } && \
{ [ -d gas/doc ] || mkdir -p gas/doc; } && \ { [ -d gas/doc ] || mkdir -p gas/doc; } && \
make -j all && make install || \ make -j"$NUM_JOBS" all && make install || \
{ echo "*** Could not build binutils, bailing out!" ; exit 2; } { echo "*** Could not build binutils, bailing out!" ; exit 2; }
cd - cd -
@ -182,8 +188,8 @@ cd $ROOT_DIR/build/gcc
../../$GCC_DIR/configure $GCC_CONFIGURE_OPTS || \ ../../$GCC_DIR/configure $GCC_CONFIGURE_OPTS || \
{ echo "Could not configure GCC, bailing out!" ; \ { echo "Could not configure GCC, bailing out!" ; \
exit 2 ; } ; } && \ exit 2 ; } ; } && \
make -j all || { rm -rf $TARGET && \ make -j"$NUM_JOBS" all || { rm -rf $TARGET && \
make -j all ; } && make install || \ make -j"$NUM_JOBS" all ; } && make install || \
{ echo "*** Could not build GCC (even after removing target dirs), bailing out!" ; exit 2; } { echo "*** Could not build GCC (even after removing target dirs), bailing out!" ; exit 2; }
cd - cd -
@ -209,7 +215,7 @@ export CFLAGS="-mcmodel=medium"
../../$NEWLIB_DIR/configure $NEWLIB_CONFIGURE_OPTS || \ ../../$NEWLIB_DIR/configure $NEWLIB_CONFIGURE_OPTS || \
{ echo "Could not configure newlib, bailing out!" ; \ { echo "Could not configure newlib, bailing out!" ; \
exit 2 ; } ; } && \ exit 2 ; } ; } && \
make -j all && make install || \ make -j"$NUM_JOBS" all && make install || \
{ echo "*** Could not build newlib, bailing out!" ; exit 2; } { echo "*** Could not build newlib, bailing out!" ; exit 2; }
cd - cd -