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cmd/go, cmd/cgo, make.bash: cross compiling with cgo enabled

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Introduce two new environment variables, CC_FOR_TARGET and CXX_FOR_TARGET.
CC_FOR_TARGET defaults to CC and is used when compiling for GOARCH, while
CC remains for compiling for GOHOSTARCH.
CXX_FOR_TARGET defaults to CXX and is used when compiling C++ code for
GOARCH.

CGO_ENABLED defaults to disabled when cross compiling and has to be
explicitly enabled.

Update #4714

LGTM=minux.ma, iant
R=golang-codereviews, minux.ma, iant, rsc, dominik.honnef
CC=golang-codereviews
https://golang.org/cl/57100043
This commit is contained in:
Elias Naur 2014-02-06 09:11:00 -08:00 • committed by Ian Lance Taylor
parent 76c9182523
commit 2dc759d7c6
6 changed files with 79 additions and 54 deletions
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17
src/make.bash
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@ -35,10 +35,15 @@
# controls the default behavior of the linker's -linkmode option. The
# default value depends on the system.
#
# CC: Command line to run to get at host C compiler.
# CC: Command line to run to compile C code for GOHOSTARCH.
# Default is "gcc". Also supported: "clang".
# CXX: Command line to run to get at host C++ compiler, only recorded
# for cgo use. Default is "g++". Also supported: "clang++".
#
# CC_FOR_TARGET: Command line to run to compile C code for GOARCH.
# This is used by cgo. Default is CC.
#
# CXX_FOR_TARGET: Command line to run to compile C++ code for GOARCH.
# This is used by cgo. Default is CXX, or, if that is not set,
# "g++" or "clang++".
#
# GO_DISTFLAGS: extra flags to provide to "dist bootstrap". Use "-s"
# to build a statically linked toolchain.
@ -153,13 +158,15 @@ echo
if [ "$GOHOSTARCH" != "$GOARCH" -o "$GOHOSTOS" != "$GOOS" ]; then
echo "# Building packages and commands for host, $GOHOSTOS/$GOHOSTARCH."
GOOS=$GOHOSTOS GOARCH=$GOHOSTARCH \
# CC_FOR_TARGET is recorded as the default compiler for the go tool. When building for the host, however,
# use the host compiler, CC, from `cmd/dist/dist env` instead.
CC=$CC GOOS=$GOHOSTOS GOARCH=$GOHOSTARCH \
"$GOTOOLDIR"/go_bootstrap install -ccflags "$GO_CCFLAGS" -gcflags "$GO_GCFLAGS" -ldflags "$GO_LDFLAGS" -v std
echo
fi
echo "# Building packages and commands for $GOOS/$GOARCH."
"$GOTOOLDIR"/go_bootstrap install $GO_FLAGS -ccflags "$GO_CCFLAGS" -gcflags "$GO_GCFLAGS" -ldflags "$GO_LDFLAGS" -v std
CC=$CC_FOR_TARGET "$GOTOOLDIR"/go_bootstrap install $GO_FLAGS -ccflags "$GO_CCFLAGS" -gcflags "$GO_GCFLAGS" -ldflags "$GO_LDFLAGS" -v std
echo
rm -f "$GOTOOLDIR"/go_bootstrap