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# By using bash builtin expansion, we can avoid
# expensively spawing three sub-processes (bash, echo, sed).
foreach(dir IN LISTS SOURCE_DIRS)
file(READ "${dir}/configure" script)
string(REGEX REPLACE
"(\n[a-zA-Z0-9_]*)='`[\$]ECHO \"[\$]([^\"]*)\" \\| [\$]SED \"[\$]delay_single_quote_subst\"`'"
[[\1='${\2//\\'/\\'\\\\\\'\\'}']]
script "${script}"
)
string(REPLACE
[[ case \`eval \\\\\$ECHO \\\\""\\\\\$\$var"\\\\"\` in]]
[[ case "\${!var}" in]]
script "${script}"
)
file(WRITE "${dir}/configure" "${script}")
endforeach()
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