build: add a syntax-check

* cfg.mk (sc_prohibit_obsolete_HAVE_HEADER_H): New rule.

diff --git a/cfg.mk b/cfg.mk
index d6197e85a7a0f5658b85f774803a261212fc7cd9..ce02851cbf86ceb27897e8f93ad6e6d4052c06c2 100644 (file)
--- a/cfg.mk
+++ b/cfg.mk
@@ -41,3 +41,10 @@ bootstrap-tools = autoconf,automake,gnulib
 export VERBOSE = yes
 
 old_NEWS_hash = 22b19691660f1870cec5f64b2c0e4641
+
+sc_obs_header_regex = \
+  \<(STDC_HEADERS|HAVE_(LIMITS|STRING|UNISTD|STDLIB)_H)\>
+sc_prohibit_obsolete_HAVE_HEADER_H:
+       @re='^[  ]*#[    ]*(el)?if.*$(sc_obs_header_regex)' \
+       msg='remove the above obsolete #if...HAVE_HEADER_H test(s)' \
+         $(_prohibit_regexp)