syscall: let mkall.sh work on multiarch systems (like Precise)

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6912063

diff --git a/src/pkg/syscall/mkall.sh b/src/pkg/syscall/mkall.sh
index 4ef3a12cfe7d81324e87efe09f467de95ae6e1c4..3900a93ab044d7660cf28373343551eda2417e81 100755 (executable)
--- a/src/pkg/syscall/mkall.sh
+++ b/src/pkg/syscall/mkall.sh
@@ -145,8 +145,13 @@ linux_386)
        mktypes="GOARCH=$GOARCH go tool cgo -godefs"
        ;;
 linux_amd64)
+       unistd_h=$(ls -1 /usr/include/asm/unistd_64.h /usr/include/x86_64-linux-gnu/asm/unistd_64.h 2>/dev/null | head -1)
+       if [ "$unistd_h" = "" ]; then
+               echo >&2 cannot find unistd_64.h
+               exit 1
+       fi
        mkerrors="$mkerrors -m64"
-       mksysnum="./mksysnum_linux.pl /usr/include/asm/unistd_64.h"
+       mksysnum="./mksysnum_linux.pl $unistd_h"
        mktypes="GOARCH=$GOARCH go tool cgo -godefs"
        ;;
 linux_arm)