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build: add GOHOSTOS and GOHOSTARCH environment variables.

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Auto-detect both if not set, and if GOARCH is not set use GOHOSTARCH.

GOHOSTARCH is used to set the -m32 or -m64 flags for gcc.

This is so that 64-bit can build binaries that run on 32-bit systems.

R=rsc, iant, brainman
CC=golang-dev
https://golang.org/cl/2342045
This commit is contained in:
Andrew Gerrand 2010-10-08 18:52:28 +11:00
parent 5781a00e00
commit 3f032d5670
2 changed files with 21 additions and 10 deletions
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22
src/Make.inc
View File

@ -21,8 +21,12 @@ endif
# Set up GOROOT_FINAL, GOARCH, GOOS if needed.
GOROOT_FINAL?=$(GOROOT)
ifeq ($(GOHOSTOS),)
GOHOSTOS:=$(shell uname | tr A-Z a-z | sed 's/mingw/windows/; s/.*windows.*/windows/')
endif
ifeq ($(GOOS),)
GOOS:=${shell uname | tr A-Z a-z | sed 's/mingw/windows/; s/windows.*/windows/'}
GOOS:=$(GOHOSTOS)
endif
ifeq ($(GOOS),darwin)
@ -35,17 +39,21 @@ else
$(error Invalid $$GOOS '$(GOOS)'; must be darwin, freebsd, linux, nacl, tiny, or windows)
endif
ifeq ($(GOARCH),)
ifeq ($(GOOS),darwin)
ifeq ($(GOHOSTARCH),)
ifeq ($(GOHOSTOS),darwin)
# Even on 64-bit platform, darwin uname -m prints i386.
# Check for amd64 with sysctl instead.
GOARCH:=${shell if sysctl machdep.cpu.extfeatures | grep EM64T >/dev/null; then echo amd64; else uname -m | sed 's/i386/386/'; fi}
GOHOSTARCH:=${shell if sysctl machdep.cpu.extfeatures | grep EM64T >/dev/null; then echo amd64; else uname -m | sed 's/i386/386/'; fi}
else
# Ask uname -m for the processor.
GOARCH:=${shell uname -m | sed 's/^..86$$/386/; s/^.86$$/386/; s/x86_64/amd64/; s/arm.*/arm/'}
GOHOSTARCH:=${shell uname -m | sed 's/^..86$$/386/; s/^.86$$/386/; s/x86_64/amd64/; s/arm.*/arm/'}
endif
endif
ifeq ($(GOARCH),)
GOARCH:=$(GOHOSTARCH)
endif
ifeq ($(GOARCH),386)
O:=8
else ifeq ($(GOARCH),amd64)
@ -63,7 +71,7 @@ $(error Invalid $$GOARCH '$(GOARCH)'; must be 386, amd64, or arm)
endif
# Save for recursive make to avoid recomputing.
export GOARCH GOOS
export GOARCH GOOS GOHOSTARCH GOHOSTOS
# ugly hack to deal with whitespaces in $GOROOT
nullstring :=
@ -101,6 +109,8 @@ export LANG LC_ALL LC_CTYPE GREP_OPTIONS GREP_COLORS
go-env:
@echo export GOARCH=$(GOARCH)
@echo export GOOS=$(GOOS)
@echo export GOHOSTARCH=$(GOHOSTARCH)
@echo export GOHOSTOS=$(GOHOSTOS)
@echo export O=$O
@echo export AS="$(AS)"
@echo export CC="$(CC)"

9
src/quietgcc.bash
View File

@ -22,14 +22,15 @@ if test "$gcc" = "@C""C@"; then
gcc=gcc
fi
# If this is a 64-bit machine, compile 64-bit versions of
# the host tools, to match the native ptrace.
case "`uname -m -p`" in
# Build 64-bit binaries on 64-bit systems, unless GOHOSTARCH=386.
case "$(uname -m -p)-$GOHOSTARCH" in
*x86_64*-386 | *amd64*-386)
gcc="$gcc -m32"
;;
*x86_64* | *amd64*)
gcc="$gcc -m64"
esac
# Run gcc, save error status, redisplay output without noise, exit with gcc status.
tmp=/tmp/qcc.$$.$USER.out
$gcc -Wall -Wno-sign-compare -Wno-missing-braces \