configure.ac: Further improved help texts of arguments.

diff --git a/configure.ac b/configure.ac
index ebc231ce86f105756da8e7558b800cda13d13012..58f0946427e252cbb151b7efad99c80f5085fb0e 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -30,10 +30,13 @@ test_cc_flags() {
        return $ret
 }
 
-dnl Optionally stick to standard C99 and POSIX.1 2001 as close as possible.
+m4_divert_once([HELP_ENABLE], [
+Build options:])
+
+dnl Optionally stick to standard C99 and POSIX:2001 as close as possible.
 AC_ARG_ENABLE([standards],
                AS_HELP_STRING([--enable-standards],
-                               [enable standards compliance mode @<:@default=no@:>@]),
+                               [C99 / POSIX standards compliance mode @<:@default=no@:>@]),
                [enable_standards="$enableval"],
                [enable_standards="no"])
 
@@ -66,7 +69,7 @@ AC_DEFINE([_FORTIFY_SOURCE], 2,
                [Define to enable protection against static sized buffer overflows.])
 AC_ARG_ENABLE([hardening],
                AS_HELP_STRING([--disable-hardening],
-                               [disable hardening options @<:@default=yes@:>@]),
+                               [hardening options @<:@default=yes@:>@]),
                [enable_hardening="$enableval"],
                [enable_hardening="yes"])
 
@@ -94,7 +97,7 @@ fi
 dnl Strict checking for potential problems.
 AC_ARG_ENABLE([strict-checks],
                AS_HELP_STRING([--disable-strict-checks],
-                               [disable strict compiler checks @<:@default=yes@:>@]),
+                               [strict compiler checks @<:@default=yes@:>@]),
                [enable_strict_checks="$enableval"],
                [enable_strict_checks="yes"])