CMake: improve library search, implement install.

Improved library search by check_function_exists_concat() macro:
it does not revert the list of libraries any more.

Improved OpenSSL library search: first find zlib, then search for
openssl libraries that may depend on zlib.

For Unix: openssl libraries can now be detected in nonstandard
locations. Supply CMAKE_LIBRARY_PATH to CMake on command line.

Added installation capability (very basic one yet).

CMakeLists.txt

@@ -23,7 +23,6 @@ include(Utilities)
 
 project( CURL C )
 
-
 file (READ ${CURL_SOURCE_DIR}/include/curl/curlver.h CURL_VERSION_H_CONTENTS)
 string (REGEX MATCH "LIBCURL_VERSION_MAJOR[ \t]+([0-9]+)"
   LIBCURL_VERSION_MJ ${CURL_VERSION_H_CONTENTS})
@@ -191,12 +190,12 @@ if(WIN32)
 endif(WIN32)
 
 # This macro checks if the symbol exists in the library and if it
-# does, it appends library to the list.
+# does, it prepends library to the list.
 macro(CHECK_LIBRARY_EXISTS_CONCAT LIBRARY SYMBOL VARIABLE)
-  check_library_exists("${LIBRARY};${CURL_LIBS}" ${SYMBOL} ""
+  check_library_exists("${LIBRARY};${CURL_LIBS}" ${SYMBOL} "${CMAKE_LIBRARY_PATH}"
     ${VARIABLE})
   if(${VARIABLE})
-    set(CURL_LIBS ${CURL_LIBS} ${LIBRARY})
+    set(CURL_LIBS ${LIBRARY} ${CURL_LIBS})
   endif(${VARIABLE})
 endmacro(CHECK_LIBRARY_EXISTS_CONCAT)
 
@@ -224,25 +223,6 @@ check_library_exists("wldap32" cldap_open "" HAVE_WLDAP32)
 #  CHECK_LIBRARY_EXISTS_CONCAT("z"      inflateEnd   HAVE_LIBZ)
 # ENDIF(NOT CURL_SPECIAL_LIBZ)
 
-option(CMAKE_USE_OPENSSL "Use OpenSSL code. Experimental" ON)
-mark_as_advanced(CMAKE_USE_OPENSSL)
-if(CMAKE_USE_OPENSSL)
-  if(WIN32)
-    find_package(OpenSSL)
-    if(OPENSSL_FOUND)
-      set(USE_SSLEAY TRUE)
-      set(USE_OPENSSL TRUE)
-      list(APPEND CURL_LIBS ${OPENSSL_LIBRARIES} )
-    else()
-      set(CMAKE_USE_OPENSSL FALSE)
-      message(STATUS "OpenSSL NOT Found, disabling CMAKE_USE_OPENSSL")
-    endif()
-  else(WIN32)
-    check_library_exists_concat("crypto" CRYPTO_lock  HAVE_LIBCRYPTO)
-    check_library_exists_concat("ssl"    SSL_connect  HAVE_LIBSSL)
-  endif(WIN32)
-endif(CMAKE_USE_OPENSSL)
-
 # Check for idn
 check_library_exists_concat("idn" idna_to_ascii_lz HAVE_LIBIDN)
 
@@ -271,6 +251,25 @@ if(CURL_ZLIB)  # AND CURL_CONFIG_HAS_BEEN_RUN_BEFORE
   endif()
 endif()
 
+option(CMAKE_USE_OPENSSL "Use OpenSSL code. Experimental" ON)
+mark_as_advanced(CMAKE_USE_OPENSSL)
+if(CMAKE_USE_OPENSSL)
+  if(WIN32)
+    find_package(OpenSSL)
+    if(OPENSSL_FOUND)
+      set(USE_SSLEAY TRUE)
+      set(USE_OPENSSL TRUE)
+      list(APPEND CURL_LIBS ${OPENSSL_LIBRARIES} )
+    else()
+      set(CMAKE_USE_OPENSSL FALSE)
+      message(STATUS "OpenSSL NOT Found, disabling CMAKE_USE_OPENSSL")
+    endif()
+  else(WIN32)
+    check_library_exists_concat("crypto" CRYPTO_lock  HAVE_LIBCRYPTO)
+    check_library_exists_concat("ssl"    SSL_connect  HAVE_LIBSSL)
+  endif(WIN32)
+endif(CMAKE_USE_OPENSSL)
+
 # If we have features.h, then do the _BSD_SOURCE magic
 check_include_file("features.h"       HAVE_FEATURES_H)
 
@@ -852,3 +851,14 @@ endif()
 if(NOT CURL_CONFIG_HAS_BEEN_RUN_BEFORE)
   set(CURL_CONFIG_HAS_BEEN_RUN_BEFORE 1 CACHE INTERNAL "Flag to track whether this is the first time running CMake or if CMake has been configured before")
 endif()
+
+# Installation.
+# First, install generated curlbuild.h
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/include/curl/curlbuild.h"
+    DESTINATION include/curl )
+# Next, install other headers excluding curlbuild.h
+install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/include/curl"
+    DESTINATION include
+    FILES_MATCHING PATTERN "*.h"
+    PATTERN "curlbuild.h" EXCLUDE)
+ 

docs/INSTALL.cmake

@@ -18,6 +18,17 @@ Building with CMake
    CMake builds can be configured either from the command line, or from one
    of CMake's GUI's.
 
+Important notice
+==================
+   If you got your curl sources from a distribution tarball, make sure to
+   delete the generic 'include/curl/curlbuild.h' file that comes with it:
+       rm -f curl/include/curl/curlbuild.h
+
+   The purpose of this file is to provide reasonable definitions for systems
+   where autoconfiguration is not available. CMake will create its own
+   version of this file in its build directory. If the "generic" version
+   is not deleted, weird build errors may occur on some systems.
+
 Command Line CMake
 ==================
    A command line build of Curl is similar to the autotools build of Curl. It
@@ -32,9 +43,10 @@ Command Line CMake
        # variable prior to running CMake.
        cmake ../curl
        make
-       # currently make test and make install are not implemented
+       # currently make test is not implemented
        #make test
-       #make install
+       # Install to default location:
+       make install
 
 ccmake
 =========

lib/CMakeLists.txt

@@ -122,3 +122,5 @@ if(WIN32)
     set_target_properties(${LIB_NAME} PROPERTIES IMPORT_SUFFIX "_imp.lib")
   endif()
 endif()
+
+install(TARGETS ${LIB_NAME} DESTINATION lib)

src/CMakeLists.txt

@@ -54,3 +54,5 @@ if(MSVC)
 endif()
 
 #INCLUDE(ModuleInstall OPTIONAL)
+
+install(TARGETS ${EXE_NAME} DESTINATION bin)