[SV 62654] Support GNU Make on z/OS

Original patches provided by Igor Todorovski <itodorov@ca.ibm.com>
Reworked by Paul Smith <psmith@gnu.org>.
Thanks to IBM for providing a test system.

* NEWS: Announce support.
* AUTHORS: Ditto.
* README.zOS: Provide details on building GNU Make on z/OS.
* build.sh (get_mk_var): z/OS sh has a strange bug which causes it to
generate extra lines of output: rework the function to print output
as we compute it instead of collecting it into a variable, which
works around this bug.
* src/makeint.h: Declare MK_OS_ZOS if we're building for z/OS.
* src/arscan.c: Don't include <ar.h> on z/OS.
* src/job.c: We can't change environ in ASCII mode on z/OS.
* src/main.c: Ditto.  Also we can't use pselect() on z/OS.
* src/posixos.c: pselect() seems to hang on z/OS: don't use it.
* tests/run_make_tests.pl: Handle different exit codes on z/OS.
* tests/test_driver.pl: Preserve some special z/OS env.vars.
Add special checks to output comparisons when on z/OS.
* tests/scripts/features/archives: Don't validate names.  Don't
try to compile empty files as IBM compilers complain.
* tests/scripts/features/shell_assignment: Fix octal value of #.
* tests/scripts/features/temp_stdin: Don't print "term".
* tests/scripts/functions/shell: Handle shell exit codes.
* tests/scripts/targets/ONESHELL: Ditto.
* tests/scripts/targets/POSIX: sh -x prints differently.
* tests/scripts/variables/SHELL: Ditto.

1 files changed, 3 insertions, 9 deletions

diff --git a/build.sh b/build.sh
index 0813fcf4..96e8f91c 100755
--- a/build.sh
+++ b/build.sh
@@ -42,19 +42,13 @@ defines="-DLOCALEDIR=\"$localedir\" -DLIBDIR=\"$libdir\" -DINCLUDEDIR=\"$include
 # Print the value to stdout.
 get_mk_var ()
 {
-  file=$1
-  var=$2
-
-  val=
-  v=$(sed -e :a -e '/\\$/N; s/\\\n//; ta' "$file" | sed -n "s=^ *$var *\= *==p")
+  v=$(sed -e :a -e '/\\$/N; s/\\\n//; ta' "$1" | sed -n "s=^ *$2 *\= *==p")
   for w in $v; do
     case $w in
-      (\$[\(\{]*[\)\}]) w=${w#\$[\(\{]}; w=$(get_mk_var "$file" "${w%[\)\}]}") ;;
+      (\$[\(\{]*[\)\}]) w=${w#\$[\(\{]}; (get_mk_var "$1" "${w%[\)\}]}") ;;
+      (*) echo "$w" ;;
     esac
-    val="${val:+$val }$w"
   done
-
-  printf '%s\n' "$val"
 }
 
 # Compile source files.  Object files are put into $objs.