Simplify configuration -- use more cmake functions (#62)

.cirrus.yml

@@ -11,10 +11,8 @@ task:
         - git checkout 32e59d2d3264e4e104b355ef73663b8b79ac4093
         - cmake .
         - make
-        - ln -s ssl/libssl.a
-        - ln -s crypto/libcrypto.a
         - cd -
     script:
-        - cmake -DBORINGSSL_INCLUDE=$PWD/boringssl/include -DBORINGSSL_LIB=$PWD/boringssl .
+        - cmake -DBORINGSSL_DIR=$PWD/boringssl .
         - make
         - make test

.travis.yml

@@ -26,10 +26,8 @@ before_script:
     - git checkout 32e59d2d3264e4e104b355ef73663b8b79ac4093
     - cmake .
     - make
-    - ln -s ssl/libssl.a
-    - ln -s crypto/libcrypto.a
     - cd -
-    - cmake -DBORINGSSL_INCLUDE=$PWD/boringssl/include -DBORINGSSL_LIB=$PWD/boringssl .
+    - cmake -DBORINGSSL_DIR=$PWD/boringssl .
 script:
     # Now build lsquic-client
     - make

CMakeLists.txt

@@ -2,20 +2,7 @@
 cmake_minimum_required(VERSION 2.8)
 
 
-project(lsquic)
-
-IF (NOT MSVC)
-# We prefer clang
-IF(NOT ("${CMAKE_C_COMPILER}" MATCHES "ccc-analyzer" OR
-        "${CMAKE_C_COMPILER}" MATCHES "gcc"          OR
-        "${CMAKE_C_COMPILER}" MATCHES "afl-gcc"))
-    FIND_PROGRAM(CLANG "clang")
-    IF(CLANG)
-        SET(CMAKE_C_COMPILER "${CLANG}")
-    ENDIF()
-ENDIF()
-
-ENDIF()
+PROJECT(lsquic C)
 
 IF (CMAKE_SYSTEM_NAME STREQUAL "Linux")
     # If using older glibc, need to link with -lrt.  See clock_getres(2).
@@ -94,25 +81,84 @@ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}  ${MY_CMAKE_FLAGS} $ENV{EXTRA_CFLAGS}")
 
 MESSAGE(STATUS "Compiler flags: ${CMAKE_C_FLAGS}")
 
-IF(NOT DEFINED BORINGSSL_INCLUDE)
-    SET(BORINGSSL_INCLUDE /usr/local/include)
-ENDIF()
-IF(NOT DEFINED BORINGSSL_LIB)
-    SET(BORINGSSL_LIB /usr/local/lib)
+# This must be done before adding other include directories to take
+# precedence over header files from other SSL installs.
+FIND_PATH(BORINGSSL_INCLUDE_DIR NAMES openssl/ssl.h
+            PATHS ${BORINGSSL_DIR}/include
+            NO_DEFAULT_PATH)
+IF (BORINGSSL_INCLUDE_DIR)
+    MESSAGE(STATUS "BoringSSL include directory ${BORINGSSL_INCLUDE_DIR}")
+    INCLUDE_DIRECTORIES(${BORINGSSL_INCLUDE_DIR})
+ELSE()
+    MESSAGE(FATAL_ERROR "BoringSSL headers not found")
 ENDIF()
 
+FOREACH(BORINGSSL_LIB ssl crypto decrepit)
+    IF (CMAKE_SYSTEM_NAME STREQUAL Windows)
+        FIND_LIBRARY(BORINGSSL_LIB_${BORINGSSL_LIB}
+            NAMES ${BORINGSSL_LIB}
+            PATHS ${BORINGSSL_DIR}/${BORINGSSL_LIB}
+            PATH_SUFFIXES Debug Release MinSizeRel RelWithDebInfo
+            NO_DEFAULT_PATH)
+    ELSE()
+        FIND_LIBRARY(BORINGSSL_LIB_${BORINGSSL_LIB}
+            NAMES lib${BORINGSSL_LIB}.a
+            PATHS ${BORINGSSL_DIR}/${BORINGSSL_LIB}
+            NO_DEFAULT_PATH)
+    ENDIF()
+    IF(BORINGSSL_LIB_${BORINGSSL_LIB})
+        MESSAGE(STATUS "Found ${BORINGSSL_LIB} library: ${BORINGSSL_LIB_${BORINGSSL_LIB}}")
+    ELSE()
+        MESSAGE(STATUS "${BORINGSSL_LIB} library not found")
+    ENDIF()
+ENDFOREACH()
 
-include_directories(${BORINGSSL_INCLUDE} ${VCPKG_INCLUDE})
-link_directories( ${BORINGSSL_LIB}  )
+IF(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+    # Find libevent on FreeBSD:
+    INCLUDE_DIRECTORIES( /usr/local/include )
+    LINK_DIRECTORIES( /usr/local/lib )
+ENDIF()
+
+# Find zlib and libevent header files and library files
+# TODO: libevent is not strictly necessary to build the library.
+FIND_PATH(ZLIB_INCLUDE_DIR NAMES zlib.h)
+IF (ZLIB_INCLUDE_DIR)
+    INCLUDE_DIRECTORIES(${ZLIB_INCLUDE_DIR})
+ELSE()
+    MESSAGE(FATAL_ERROR "zlib.h was not found")
+ENDIF()
+IF (CMAKE_SYSTEM_NAME STREQUAL Windows)
+    FIND_LIBRARY(ZLIB_LIB zlib)
+ELSEIF(CMAKE_SYSTEM_NAME STREQUAL Darwin)
+    # XXX somehow FIND_LIBRARY() does not find zlib on Travis?
+    SET(ZLIB_LIB z)
+ELSE()
+    FIND_LIBRARY(ZLIB_LIB libz.a)
+ENDIF()
+IF(ZLIB_LIB)
+    MESSAGE(STATUS "Found zlib: ${ZLIB_LIB}")
+ELSE()
+    MESSAGE(STATUS "zlib not found")
+ENDIF()
+FIND_PATH(EVENT_INCLUDE_DIR NAMES event2/event.h)
+IF (EVENT_INCLUDE_DIR)
+    INCLUDE_DIRECTORIES(${EVENT_INCLUDE_DIR})
+ELSE()
+    MESSAGE(FATAL_ERROR "event2/event.h was not found")
+ENDIF()
+IF (CMAKE_SYSTEM_NAME STREQUAL Windows)
+    FIND_LIBRARY(EVENT_LIB event)
+ELSE()
+    FIND_LIBRARY(EVENT_LIB libevent.a)
+ENDIF()
+IF(EVENT_LIB)
+    MESSAGE(STATUS "Found event: ${EVENT_LIB}")
+ELSE()
+    MESSAGE(STATUS "libevent not found")
+ENDIF()
 
 SET(CMAKE_INCLUDE_CURRENT_DIR ON)
 include_directories( include src/lshpack)
-IF(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD" OR ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
-    # Find libevent on FreeBSD:
-    include_directories( /usr/local/include )
-    link_directories( /usr/local/lib )
-ENDIF()
-
 
 IF (NOT MSVC)
 add_executable(http_client
@@ -120,7 +166,8 @@ add_executable(http_client
     test/prog.c
     test/test_common.c
 )
-target_link_libraries(http_client lsquic event pthread libssl.a libcrypto.a ${LIBS} z m)
+TARGET_LINK_LIBRARIES(http_client lsquic ${EVENT_LIB} pthread
+    ${BORINGSSL_LIB_ssl} ${BORINGSSL_LIB_crypto} ${LIBS} ${ZLIB_LIB} m)
 
 #MSVC
 ELSE()
@@ -134,10 +181,10 @@ add_executable(http_client
 
 target_link_libraries(http_client
         lsquic
-        ${VCPKG_LIB}/event.lib
-        ${VCPKG_LIB}/zlib.lib
-		${BORINGSSL_LIB}/ssl.lib
-		${BORINGSSL_LIB}/crypto.lib
+        ${EVENT_LIB}
+        ${ZLIB_LIB}
+		${BORINGSSL_LIB_ssl}
+		${BORINGSSL_LIB_crypto}
 		ws2_32
 		${LIBS} )
 

test/unittests/CMakeLists.txt

@@ -4,19 +4,15 @@ INCLUDE_DIRECTORIES(../../src/liblsquic)
 
 ENABLE_TESTING()
 
+SET(LIBS lsquic ${BORINGSSL_LIB_crypto} ${BORINGSSL_LIB_ssl} ${ZLIB_LIB})
+
 IF (MSVC)
-    SET(LIBS
-        lsquic
-        ${VCPKG_LIB}/event.lib
-        ${VCPKG_LIB}/zlib.lib
-		${BORINGSSL_LIB}/ssl.lib
-		${BORINGSSL_LIB}/crypto.lib
-		ws2_32)
+    LIST(APPEND LIBS ws2_32)
     SET(ADDL_SOURCES ../../wincompat/getopt.c ../../wincompat/getopt1.c)
     SET(LIB_FLAGS "-FORCE:MULTIPLE")
 ELSE()
     SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-value")
-    SET(LIBS lsquic libcrypto.a libssl.a z m pthread)
+    LIST(APPEND LIBS m pthread)
 ENDIF()
 
 SET(TESTS