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autotools: fix subdir m4 check, never let it return -I

If BDB_CPPFLAGS returns only "-I", the next argument sent to the preprocessor
is treated as a path. There are 2 fixes here:

1. Check in CPPFLAGS, as a user might have manually passed a path to check.
2. Ensure the value is not empty before setting BDB_CPPFLAGS to "-I value"
0.10
Cory Fields 11 years ago
parent
commit
c546dc05bb
  1. 4
      src/m4/bitcoin_subdir_to_include.m4

4
src/m4/bitcoin_subdir_to_include.m4

@ -5,8 +5,10 @@ AC_DEFUN([BITCOIN_SUBDIR_TO_INCLUDE],[ @@ -5,8 +5,10 @@ AC_DEFUN([BITCOIN_SUBDIR_TO_INCLUDE],[
AC_MSG_RESULT([default])
else
echo "#include <$2$3.h>" >conftest.cpp
newinclpath=`${CXXCPP} -M conftest.cpp 2>/dev/null | [ tr -d '\\n\\r\\\\' | sed -e 's/^.*[[:space:]:]\(\/[^[:space:]]*\)]$3[\.h[[:space:]].*$/\1/' -e t -e d`]
newinclpath=`${CXXCPP} ${CPPFLAGS} -M conftest.cpp 2>/dev/null | [ tr -d '\\n\\r\\\\' | sed -e 's/^.*[[:space:]:]\(\/[^[:space:]]*\)]$3[\.h[[:space:]].*$/\1/' -e t -e d`]
AC_MSG_RESULT([${newinclpath}])
if test "x${newinclpath}" != "x"; then
eval "$1=\"\$$1\"' -I${newinclpath}'"
fi
fi
])

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