cmake: improve: configure proxyres_config.h for preprocessor conditions

Author: sergio-nsk

CMakeLists.txt

@@ -40,7 +40,8 @@ set(PROXYRES_HDRS
     include/proxyres/config.h
     include/proxyres/log.h
     include/proxyres/proxyres.h
-    include/proxyres/resolver.h)
+    include/proxyres/resolver.h
+    ${PROJECT_BINARY_DIR}/proxyres_config.h)
 if(PROXYRES_EXECUTE)
     list(APPEND PROXYRES_HDRS
         include/proxyres/execute.h)
@@ -254,24 +255,25 @@ if(PROXYRES_USE_CXX)
     endif()
 endif()
 
+if(NOT WIN32)
+    check_include_file("net/if_arp.h" HAVE_NET_IF_ARP_H)
+    check_include_file("netdb.h" HAVE_NETDB_H)
+endif()
+
+configure_file(proxyres_config.h.in proxyres_config.h @ONLY NEWLINE_STYLE UNIX)
+
 add_library(proxyres ${PROXYRES_HDRS} ${PROXYRES_SRCS} ${PROXYRES_C_SRCS})
 set_property(TARGET proxyres PROPERTY C_STANDARD 11 CXX_STANDARD 11)
 if(PROXYRES_BUILD_TESTS)
     target_compile_definitions(proxyres PRIVATE PROXYRES_TESTING)
 endif()
 target_include_directories(proxyres PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}
-    ${CMAKE_CURRENT_SOURCE_DIR}/include/proxyres)
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/proxyres
+    ${PROJECT_BINARY_DIR})
 target_include_directories(proxyres PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>)
 
-if(NOT WIN32)
-    check_include_file("net/if_arp.h" HAVE_NET_IF_ARP_H)
-    if(HAVE_NET_IF_ARP_H)
-        target_compile_definitions(proxyres PRIVATE HAVE_NET_IF_ARP_H)
-    endif()
-endif()
-
 if(PROXYRES_CURL AND (PROXYRES_EXECUTE OR PROXYRES_BUILD_CLI))
     if(NOT TARGET CURL::libcurl)
         include(FetchContent)

fetch_posix.c

@@ -1,3 +1,5 @@
+#include "proxyres_config.h"
+
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdlib.h>
@@ -6,13 +8,16 @@
 #include <string.h>
 #include <errno.h>
 
+#if HAVE_NETDB_H
+#  include <netdb.h>
+#endif
+
 #ifdef _WIN32
 #  include <winsock2.h>
 #  include <ws2tcpip.h>
 #else
 #  include <sys/types.h>
 #  include <sys/socket.h>
-#  include <netdb.h>
 #  include <unistd.h>
 #endif
 

net_adapter_linux.c

@@ -1,12 +1,17 @@
+#include "proxyres_config.h"
+
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 
+#if HAVE_NETDB_H
+#  include <netdb.h>
+#endif
+
 #include <sys/types.h>
 #include <sys/socket.h>
-#include <netdb.h>
 #include <unistd.h>
 #include <ifaddrs.h>
 #include <net/if.h>

net_adapter_mac.c

@@ -1,3 +1,5 @@
+#include "proxyres_config.h"
+
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdlib.h>

net_util.c

@@ -1,3 +1,5 @@
+#include "proxyres_config.h"
+
 #include <stdint.h>
 #include <stdbool.h>
 #include <stddef.h>
@@ -6,14 +8,17 @@
 #include <string.h>
 #include <errno.h>
 
+#if HAVE_NETDB_H
+#  include <netdb.h>
+#endif
+
 #ifdef _WIN32
 #  include <winsock2.h>
 #  include <ws2tcpip.h>
 #else
 #  include <arpa/inet.h>
 #  include <sys/types.h>
 #  include <sys/socket.h>
-#  include <netdb.h>
 #  include <unistd.h>
 #endif
 

proxyres_config.h.in

@@ -0,0 +1,5 @@
+// Define to 1 if you have the <net/if_arp.h> header file.
+#cmakedefine HAVE_NET_IF_ARP_H 1
+
+// Define to 1 if you have the <netdb.h> header file.
+#cmakedefine HAVE_NETDB_H 1

wpad_dhcp_posix.c

@@ -1,3 +1,5 @@
+#include "proxyres_config.h"
+
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdlib.h>
@@ -7,6 +9,10 @@
 #include <time.h>
 #include <errno.h>
 
+#if HAVE_NETDB_H
+#  include <netdb.h>
+#endif
+
 #ifdef _WIN32
 #  include <winsock2.h>
 #  include <ws2tcpip.h>
@@ -15,7 +21,6 @@
 #  include <arpa/inet.h>
 #  include <sys/types.h>
 #  include <sys/socket.h>
-#  include <netdb.h>
 #  include <unistd.h>
 #endif
 

wpad_dns.c

@@ -1,3 +1,5 @@
+#include "proxyres_config.h"
+
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -6,14 +8,17 @@
 #include <string.h>
 #include <errno.h>
 
+#if HAVE_NETDB_H
+#  include <netdb.h>
+#endif
+
 #ifdef _WIN32
 #  include <winsock2.h>
 #  include <ws2tcpip.h>
 #  include <windows.h>
 #else
 #  include <sys/types.h>
 #  include <sys/socket.h>
-#  include <netdb.h>
 #  include <unistd.h>
 #endif