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BITCOIN_SUBDIR_TO_INCLUDE: Improve compatibility further, and reformat to be more readable

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This commit is contained in:
Luke Dashjr 2016-06-08 21:40:25 +00:00
parent f93e7c0e10
commit 1490995c12
1 changed files with 38 additions and 4 deletions
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42
build-aux/m4/bitcoin_subdir_to_include.m4
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@ -5,14 +5,48 @@ dnl file COPYING or http://www.opensource.org/licenses/mit-license.php.
dnl BITCOIN_SUBDIR_TO_INCLUDE([CPPFLAGS-VARIABLE-NAME],[SUBDIRECTORY-NAME],[HEADER-FILE])
dnl SUBDIRECTORY-NAME must end with a path separator
AC_DEFUN([BITCOIN_SUBDIR_TO_INCLUDE],[
if test "$2" = ""; then
m4_pushdef([_result_var],[$1])
m4_pushdef([_rel_path],[$2])
m4_pushdef([_header_file],[$3.h])
if test "[]_rel_path" = ""; then
AC_MSG_RESULT([default])
else
echo "#include <$2$3.h>" >conftest.cpp
newinclpath=$(${CXXCPP} ${CPPFLAGS} -M conftest.cpp 2>/dev/null | sed [-E -e ':a' -e '/\\$/!b b' -e N -e 's/\\\n/ /' -e 't a' -e ':b' -e 's/^[^:]*:[[:space:]]*(([^[:space:]\]|\\.)*[[:space:]])*(([^[:space:]\]|\\.)*)]$3\.h[([[:space:]].*)?$/\3/' -e 't' -e d])
echo '[#]include <'"_rel_path"'/_header_file>' >conftest.cpp
newinclpath=$(
${CXXCPP} ${CPPFLAGS} -M conftest.cpp 2>/dev/null |
${SED} -E m4_bpatsubsts([[
:build_line
# If the line doesn't end with a backslash, it is complete; go on to process it
/\\$/!b have_complete_line
# Otherwise, read the next line, and concatenate it to the current one with a space
N
s/\\\n/ /
# Then go back and check for a trailing backslash again.
t build_line
# When we get here, we have the completed line, with all continuations collapsed.
:have_complete_line
s/^[^:]*:[[:space:]]*(([^[:space:]\]|\\.)*[[:space:]])*(([^[:space:]\]|\\.)*)(\\|\\\\|\/)?]]patsubst(]_header_file[,[\.],[\\.])[[([[:space:]].*)?$/\3/
# ^^^^^^^ The Make line begins with a target (which we don't care about)
# ^^^^^^^^^^^^ Ignore any spaces following it
# ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Match any number of other dependencies
# ^^^^^^^^^^^^^^^^^^^^^^ Match any path components for our dependency; note this is reference 3, which we are replacing with
# ^^^^^^^^^^^^^ Accept the path ending in a backslash, a double-backslash (ie escaped), or a forward slash
# ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The filename must match exactly (periods are escaped, since a normal period matches any character in regex)
# ^^^^^^^^^^^^^^^^^ Filename must be followed by a space, but after that we don't care; we still need to match it all so it gets replaced, however
# Delete the line, but only if we failed to find the directory (t jumps past the d if we matched)
t
d
]],[
\s*\(#.*\)?$],[],[
\(.*\)],[ -e '\1'])
dnl ^^^^^^^^^^^^^^^^^^^^^^^ Deletes comments and processes sed expressions into -e arguments
)
AC_MSG_RESULT([${newinclpath}])
if test "${newinclpath}" != ""; then
eval "$1=\"\$$1\"' -I${newinclpath}'"
eval "_result_var=\"\$_result_var\"' -I${newinclpath}'"
fi
fi
m4_popdef([_result_var],[_rel_path],[_header_file])
])