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libgo patch committed: Only define PathMax if PATH_MAX is defined


This patch to libgo only defines syscall.PathMax if PATH_MAX is defined
in the system header files.  Bootstrapped on x86_64-unknown-linux-gnu.
Committed to mainline and 4.7 branch.

Ian

diff -r 4692bc350a0a libgo/mksysinfo.sh
--- a/libgo/mksysinfo.sh	Tue Apr 24 09:23:40 2012 -0700
+++ b/libgo/mksysinfo.sh	Tue Apr 24 12:11:02 2012 -0700
@@ -275,8 +275,9 @@
   sed -e 's/^\(const \)__\(PC[^= ]*\)\(.*\)$/\1\2 = __\2/' >> ${OUT}
 
 # The PATH_MAX constant.
-grep '^const _PATH_MAX ' gen-sysinfo.go |
+if grep '^const _PATH_MAX ' gen-sysinfo.go >/dev/null 2>&1; then
   echo 'const PathMax = _PATH_MAX' >> ${OUT}
+fi
 
 # epoll constants.
 grep '^const _EPOLL' gen-sysinfo.go |

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