Added NMH_UNUSED macro for suppressing warnings about unused parameters

[mmh] / configure.ac

diff --git a/configure.ac b/configure.ac
index 2a56e97..28821ae 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -218,6 +218,20 @@ fi
 
 AC_PROG_CC
 
+AC_CACHE_CHECK(whether preprocessor supports -Wunused-macros,
+  nmh_cv_has_unusedmacros,
+  [nmh_saved_cppflags="$CPPFLAGS"
+   CPPFLAGS="$CPPFLAGS -Wunused-macros -Wno-unused-macros"
+   AC_TRY_COMPILE([],[],nmh_cv_has_unusedmacros=yes,nmh_cv_has_unusedmacros=no)
+   CPPFLAGS="$nmh_saved_cppflags"])
+
+if test "$nmh_cv_has_unusedmacros" = 'yes'; then
+  test -z "$CPPLAGS"  &&  CPPFLAGS=-Wunused-macros \
+                      ||  CPPFLAGS="$CPPFLAGS -Wunused-macros"
+  DISABLE_UNUSED_MACROS_WARNING=-Wno-unused-macros
+fi
+AC_SUBST(DISABLE_UNUSED_MACROS_WARNING)dnl
+
 AC_CACHE_CHECK(whether compiler supports -Wno-pointer-sign, nmh_cv_has_noptrsign,
 [nmh_saved_cflags="$CFLAGS"
  CFLAGS="$CFLAGS -Wno-pointer-sign"
@@ -456,13 +470,13 @@ dnl before system header files.
 case "$target_os" in
   linux*)
     # Like DEFS, but doesn't get stomped on by configure when using config.h:
-    OURDEFS="$OURDEFS -D_GNU_SOURCE"
+    test -z "$OURDEFS"  &&  OURDEFS="-D_GNU_SOURCE"  \
+                        ||  OURDEFS="$OURDEFS -D_GNU_SOURCE"
     ;;
 esac
 AC_SUBST(OURDEFS)
 
 AC_HEADER_STDC
-AC_HEADER_TIME
 AC_HEADER_TIOCGWINSZ
 AC_CHECK_HEADERS(errno.h fcntl.h crypt.h termcap.h \
                  langinfo.h wchar.h wctype.h iconv.h netdb.h \
@@ -487,29 +501,7 @@ AC_CHECK_HEADER([sys/ptem.h], AC_DEFINE(WINSIZE_IN_PTEM,1,
 dnl ---------------
 dnl CHECK FUNCTIONS
 dnl ---------------
-AC_CHECK_FUNCS(writev lstat tzset getutent nl_langinfo)
-
-dnl Look for the initgroups() declaration.  On AIX 4.[13], Solaris 4.1.3, and
-dnl ULTRIX 4.2A the function is defined in libc but there's no declaration in
-dnl any system header.  
-dnl
-dnl On Solaris 2.[456], the declaration is in <grp.h>.  On HP-UX 9-11 and
-dnl (reportedly) FreeBSD 3.[23], it's in <unistd.h>.  Any other locations we
-dnl need to check?
-AH_TEMPLATE(INITGROUPS_HEADER, [Define to the header containing the declaration of `initgroups'.])
-AC_EGREP_HEADER(initgroups, grp.h, AC_DEFINE(INITGROUPS_HEADER, <grp.h>),
-                AC_EGREP_HEADER(initgroups, unistd.h, 
-                                AC_DEFINE(INITGROUPS_HEADER, <unistd.h>)))
-
-dnl On AIX 4.1, snprintf() is defined in libc.a but there's no prototype in
-dnl <stdio.h> or elsewhere.  Apparently it's not officially supported (though it
-dnl seems to work perfectly and IBM apparently uses it in internal code).
-dnl Anyhow, if we omit our own snprintf() and vsnprintf() prototypes when we
-dnl HAVE_SNPRINTF, we get a billion warnings at compile time.  Use the C
-dnl preprocessor to preprocess stdio.h and make sure that there's actually a 
-dnl prototype. 
-AC_EGREP_HEADER(snprintf, stdio.h, AC_DEFINE(HAVE_SNPRINTF_PROTOTYPE,1,
-  [Define to 1 if <stdio.h> has a prototype for snprintf().]))
+AC_CHECK_FUNCS(writev lstat getutent nl_langinfo)
 
 dnl Check for multibyte character set support
 if test "x$ac_cv_header_wchar_h" = "xyes" -a "x$ac_cv_header_wctype_h" = "xyes" \
@@ -766,18 +758,7 @@ dnl ----------------
 dnl CHECK STRUCTURES
 dnl ----------------
 
-AC_CHECK_MEMBERS(struct tm.tm_gmtoff,,,
-  [#ifdef TIME_WITH_SYS_TIME
-# include <sys/time.h>
-# include <time.h>
-#else
-# ifdef TM_IN_SYS_TIME
-#  include <sys/time.h>
-# else
-#  include <time.h>
-# endif
-#endif])
-
+AC_CHECK_MEMBERS([struct tm.tm_gmtoff],,,[#include <time.h>])
 AC_CHECK_MEMBERS(struct utmp.ut_type,,,[#include <utmp.h>])
 
 AC_STRUCT_DIRENT_D_TYPE
@@ -801,59 +782,6 @@ SIGNAL_H=$nmh_cv_path_signal_h
 AC_SUBST(SIGNAL_H)dnl
 
 dnl ----------------
-dnl OS SPECIFIC DEFINES
-dnl ----------------
-AH_TEMPLATE(SYS5, [Defined for Solaris 2.x, Irix, OSF/1, HP-UX, AIX, SCO5; only used in vmh.c which is not built.])
-AH_TEMPLATE(SVR4, [Defined for Solaris 2.x, Irix, OSF/1, HP-UX, AIX; only used in vmh.c which is not built.])
-AH_TEMPLATE(BSD44, [Defined for SunOS 4, FreeBSD, NetBSD, OpenBSD, BSD/OS, Mac OS X/Rhapsody; only used in vmh.c which is not built.])
-AH_TEMPLATE(BSD42, [Defined for SunOS 4, FreeBSD, NetBSD, OpenBSD, BSD/OS, Mac OS X/Rhapsody -- does PicoBSD have uname?])
-AH_TEMPLATE(SCO_5_STDIO, [Defined for SCO5.])
-
-case "$target_os" in
-
-  solaris2*)
-    AC_DEFINE(SYS5)
-    AC_DEFINE(SVR4)
-    ;;
-  irix*)
-    AC_DEFINE(SYS5)
-    AC_DEFINE(SVR4)
-    ;;
-  osf*)
-    AC_DEFINE(SYS5)
-    AC_DEFINE(SVR4)
-    ;;
-  aix*)
-    AC_DEFINE(SYS5)
-    AC_DEFINE(SVR4)
-    ;;
-  sunos4*)
-    AC_DEFINE(BSD42)
-    ;;
-  freebsd*)  
-    AC_DEFINE(BSD42)
-    AC_DEFINE(BSD44)
-    ;;
-  netbsd*)
-    AC_DEFINE(BSD42)
-    AC_DEFINE(BSD44)
-    ;;
-  openbsd*)
-    AC_DEFINE(BSD42)
-    AC_DEFINE(BSD44)
-    ;;
-  bsd/os*)
-    AC_DEFINE(BSD42)
-    AC_DEFINE(BSD44)
-    ;;
-  sco5*)
-    AC_DEFINE(SYS5)
-    AC_DEFINE(SCO_5_STDIO)
-    ;;
-esac
-
-
-dnl ----------------
 dnl OUTPUT MAKEFILES
 dnl ----------------
 AC_CONFIG_FILES(Makefile config/Makefile h/Makefile sbr/Makefile uip/Makefile \