CMake: Do not use -lresolv if res_init exists in libc

[apt.git] / CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fcb2005713cf39decd9a33aa95801e800bbef3d5..8c41534adac0147d09dbcfa2afa698997f25a002 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -118,6 +118,39 @@ if (CMAKE_USE_PTHREADS_INIT)
   set(HAVE_PTHREAD 1)
 endif()
 
+CHECK_INCLUDE_FILES(machine/endian.h HAVE_MACHINE_ENDIAN_H)
+CHECK_INCLUDE_FILES(sys/endian.h HAVE_SYS_ENDIAN_H)
+CHECK_INCLUDE_FILES(endian.h HAVE_ENDIAN_H)
+if (NOT HAVE_ENDIAN_H)
+  if (HAVE_MACHINE_ENDIAN_H OR HAVE_SYS_ENDIAN_H)
+    configure_file(CMake/endian.h.in ${PROJECT_BINARY_DIR}/include/endian.h)
+  else()
+    message(FATAL_ERROR "Cannot find endian.h")
+  endif()
+endif()
+
+
+include(CheckTypeSize)
+set(CMAKE_EXTRA_INCLUDE_FILES "signal.h")
+check_type_size("sig_t" SIG_T LANGUAGE "CXX")
+check_type_size("sighandler_t" SIGHANDLER_T LANGUAGE "CXX")
+set(CMAKE_EXTRA_INCLUDE_FILES)
+if (NOT HAVE_SIGHANDLER_T)
+  if (HAVE_SIG_T)
+    add_definitions(-Dsighandler_t=sig_t)
+  else()
+    message(FATAL_ERROR "Platform defines neither sig_t nor sighandler_t")
+  endif()
+endif()
+
+# Handle resolving
+check_function_exists(res_init HAVE_LIBC_RESOLV)
+if(HAVE_LIBC_RESOLV)
+    set(RESOLV_LIBRARIES)
+else()
+    set(RESOLV_LIBRARIES -lresolv)
+endif()
+
 # Configure some variables like package, version and architecture.
 set(PACKAGE ${PROJECT_NAME})
 set(PACKAGE_MAIL "APT Development Team <deity@lists.debian.org>")