c: Refactor configure.ac and silence autoscan warnings

Signed-off-by: Michael Brown <[email protected]>

Author: mcb30

c/configure.ac

@@ -1,20 +1,42 @@
+# Configure autoconf
 AC_INIT([libcx], [0.1], [[email protected]])
 AC_CONFIG_MACRO_DIRS([m4])
 AC_CONFIG_SRCDIR([src/generator.c])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_HEADERS([config.h])
+
+# Check for programs
 AC_PROG_CC
+AC_PROG_CXX
 AM_PROG_AR
+
+# Configure libtool
+LT_INIT([shared])
+
+# Configure automake
+AM_INIT_AUTOMAKE([foreign subdir-objects])
+
+# Check for libraries
 PKG_CHECK_MODULES(SSL, openssl)
-AC_CHECK_HEADERS([stdlib.h openssl/rand_drbg.h openssl/x509.h])
+
+# Check for headers
+AC_CHECK_HEADERS([stddef.h stdlib.h string.h \
+		  openssl/rand_drbg.h openssl/x509.h])
+
+# Check for types
 AC_TYPE_SIZE_T
-AC_CHECK_FUNCS([RAND_DRBG_instantiate])
+
+# Check for library functions
+AC_FUNC_MALLOC
+AC_CHECK_FUNCS([memset])
+
+# Configure tests
 AX_VALGRIND_DFLT([sgcheck], [off])
 AX_VALGRIND_CHECK
 AM_EXTRA_RECURSIVE_TARGETS([check-valgrind])
 m4_foreach([vgtool], [valgrind_tool_list],
 	   [AM_EXTRA_RECURSIVE_TARGETS([check-valgrind-]vgtool)])
-LT_INIT([shared])
-AM_INIT_AUTOMAKE([foreign subdir-objects])
+
+# Generate files
 AC_CONFIG_FILES([Makefile src/Makefile])
 AC_OUTPUT