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c++: compute the header guards.

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This is a frequent request.  Recently pointed out by Wei Song,
<http://lists.gnu.org/archive/html/help-bison/2012-05/msg00002.html>.

* data/c.m4 (b4_tocpp, b4_cpp_guard, b4_cpp_guard_open)
(b4_cpp_guard_close): New.
* data/lalr1.cc, data/location.cc, data/stack.hh: Use them.
* TODO (Header Guards): Move to...
* NEWS: here.
Formatting changes.
This commit is contained in:
Akim Demaille
2012-05-21 14:21:51 +02:00
parent a19728cbb5
commit 22172d4731
7 changed files with 63 additions and 23 deletions
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27
data/c.m4
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@@ -17,6 +17,33 @@
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# b4_tocpp(STRING)
# ----------------
# Convert STRING into a valid C macro name.
m4_define([b4_tocpp],
[m4_toupper(m4_bpatsubst(m4_quote($1), [[^a-zA-Z0-9]+], [_]))])
# b4_cpp_guard(FILE)
# ------------------
# A valid C macro name to use as a CPP header guard for FILE.
m4_define([b4_cpp_guard],
[b4_tocpp(m4_defn([b4_prefix])/[$1])])
# b4_cpp_guard_open(FILE)
# b4_cpp_guard_close(FILE)
# ------------------------
# Open/close CPP inclusion guards for FILE.
m4_define([b4_cpp_guard_open],
[#ifndef b4_cpp_guard([$1])
# define b4_cpp_guard([$1])])
m4_define([b4_cpp_guard_close],
[#endif b4_comment([!b4_cpp_guard([$1])])])
## ---------------- ##
## Identification. ##
## ---------------- ##