set -e causes AS_IF to exit in else clause

Hi,

This is with autoconf 2.71.

I use autom4te to create a script and discovered that the script exits 
when the else clause in AS_IF is reached. It seems it's caused by the 
combination that function as_fn_nop() is called in the else clause and 
that I have 'set -e' earlier in the script.

I suppose my workaround will be that I remove the 'set -e', but the 
behaviour is quite unexpected. I've boiled down the script to a minimal 
test case that illustrates the behaviour


cat > foo.m4sh <<EOF
AS_INIT
AS_ME_PREPARE
set -e

if test x"$1" = x"apple"; then
   echo apple;
else
   echo not apple;
fi

AS_IF([test x"$1" = x"orange"],
       [AS_ECHO([orange])],
       [AS_ECHO([not orange])])
EOF

autom4te -l M4sh -o foo.sh foo.m4sh

sh -x foo.sh hello world

...

+ set -e
+ test x = xapple
+ echo not apple
not apple
+ test x = xorange
+ as_fn_nop
+ return 1

i.e., it exits before printing anything about the orange

Thanks,

Peter