cmake: Check system headers

Github-Pull: #6
Rebased-From: 64b1fd4

cmake/bitcoin-config.h.in

@@ -30,6 +30,27 @@
 /* Copyright year */
 #define COPYRIGHT_YEAR @COPYRIGHT_YEAR@
 
+/* Define to 1 if you have the <byteswap.h> header file. */
+#cmakedefine HAVE_BYTESWAP_H 1
+
+/* Define to 1 if you have the <endian.h> header file. */
+#cmakedefine HAVE_ENDIAN_H 1
+
+/* Define to 1 if you have the <sys/endian.h> header file. */
+#cmakedefine HAVE_SYS_ENDIAN_H 1
+
+/* Define to 1 if you have the <sys/prctl.h> header file. */
+#cmakedefine HAVE_SYS_PRCTL_H 1
+
+/* Define to 1 if you have the <sys/resources.h> header file. */
+#cmakedefine HAVE_SYS_RESOURCES_H 1
+
+/* Define to 1 if you have the <sys/vmmeter.h> header file. */
+#cmakedefine HAVE_SYS_VMMETER_H 1
+
+/* Define to 1 if you have the <vm/vm_param.h> header file. */
+#cmakedefine HAVE_VM_VM_PARAM_H 1
+
 /* Define to the address where bug reports for this package should be sent. */
 #define PACKAGE_BUGREPORT "@PACKAGE_BUGREPORT@"
 

cmake/introspection.cmake

@@ -2,6 +2,16 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+include(CheckIncludeFileCXX)
 include(TestBigEndian)
 
 test_big_endian(WORDS_BIGENDIAN)
+
+# The following HAVE_{HEADER}_H variables go to the bitcoin-config.h header.
+check_include_file_cxx(byteswap.h HAVE_BYTESWAP_H)
+check_include_file_cxx(endian.h HAVE_ENDIAN_H)
+check_include_file_cxx(sys/endian.h HAVE_SYS_ENDIAN_H)
+check_include_file_cxx(sys/prctl.h HAVE_SYS_PRCTL_H)
+check_include_file_cxx(sys/resources.h HAVE_SYS_RESOURCES_H)
+check_include_file_cxx(sys/vmmeter.h HAVE_SYS_VMMETER_H)
+check_include_file_cxx(vm/vm_param.h HAVE_VM_VM_PARAM_H)