Remove some bashisms from configure.ac

"configure.ac" is used to generate "configure", which is supposed to be
run with /bin/sh (as suggested by the shebang line of "configure"). As a
result it is a good idea to remove any /bin/sh-incompatible syntax from
configure.ac. Otherwise, systems that do not use Bash as their /bin/sh
are unable to run "configure" due to syntax errors.

1 files changed, 11 insertions, 6 deletions

diff --git a/configure.ac b/configure.ac
index 85fec77a29c9..ecacb8ab45be 100644
--- a/configure.ac
+++ b/configure.ac
@@ -214,9 +214,11 @@ AC_SUBST(ENABLE_S3, [$enable_s3])
 AC_LANG_POP(C++)
 
 if test -n "$enable_s3"; then
-  declare -a aws_version_tokens=($(printf '#include <aws/core/VersionConfig.h>\nAWS_SDK_VERSION_STRING' | $CPP $CPPFLAGS - | grep -v '^#.*' | sed 's/"//g' | tr '.' ' '))
-  AC_DEFINE_UNQUOTED([AWS_VERSION_MAJOR], ${aws_version_tokens@<:@0@:>@}, [Major version of aws-sdk-cpp.])
-  AC_DEFINE_UNQUOTED([AWS_VERSION_MINOR], ${aws_version_tokens@<:@1@:>@}, [Minor version of aws-sdk-cpp.])
+  aws_version_tokens="$(printf '#include <aws/core/VersionConfig.h>\nAWS_SDK_VERSION_STRING' | $CPP $CPPFLAGS - | grep -v '^#.*' | sed 's/"//g' | tr '.' ' ')"
+  aws_major_version="$(awk -v ver="${aws_version_tokens}" '{print $1}')"
+  aws_minor_version="$(awk -v ver="${aws_version_tokens}" '{print $2}')"
+  AC_DEFINE_UNQUOTED([AWS_VERSION_MAJOR], ${aws_major_version}, [Major version of aws-sdk-cpp.])
+  AC_DEFINE_UNQUOTED([AWS_VERSION_MINOR], ${aws_minor_version}, [Minor version of aws-sdk-cpp.])
 fi
 
 
@@ -279,9 +281,12 @@ AC_SUBST(sandbox_shell)
 test "$prefix" = NONE && prefix=$ac_default_prefix
 test "$exec_prefix" = NONE && exec_prefix='${prefix}'
 for name in $ac_subst_vars; do
-    declare $name="$(eval echo "${!name}")"
-    declare $name="$(eval echo "${!name}")"
-    declare $name="$(eval echo "${!name}")"
+    for _ in 1 2 3; do
+    if printf '%s' "${name}" | egrep '^[_[:alpha:]][_[:alnum:]]*$'
+    then
+        eval "${name}"="$(eval echo "\${${name}}")"
+    fi
+    done
 done
 
 rm -f Makefile.config