thodg/libgit2/cmake/Modules/SelectHashes.cmake

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• Hash : 94fc83b6
  Author :
  Date : 2019-06-13T16:48:35
  

  cmake: Modulize our TLS & hash detection The interactions between `USE_HTTPS` and `SHA1_BACKEND` have been streamlined. Previously we would have accepted not quite working configurations (like, `-DUSE_HTTPS=OFF -DSHA1_BACKEND=OpenSSL`) and, as the OpenSSL detection only ran with `USE_HTTPS`, the link would fail. The detection was moved to a new `USE_SHA1`, modeled after `USE_HTTPS`, which takes the values "CollisionDetection/Backend/Generic", to better match how the "hashing backend" is selected, the default (ON) being "CollisionDetection". Note that, as `SHA1_BACKEND` is still used internally, you might need to check what customization you're using it for.

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• cmake/Modules/SelectHashes.cmake

• # Select a hash backend
  
  # USE_SHA1=CollisionDetection(ON)/HTTPS/Generic/OFF
  
  IF(USE_SHA1 STREQUAL ON OR USE_SHA1 STREQUAL "CollisionDetection")
  	SET(SHA1_BACKEND "CollisionDetection")
  ELSEIF(USE_SHA1 STREQUAL "HTTPS")
  	message("Checking HTTPS backend… ${HTTPS_BACKEND}")
  	IF(HTTPS_BACKEND STREQUAL "SecureTransport")
  		SET(SHA1_BACKEND "CommonCrypto")
  	ELSEIF(HTTPS_BACKEND STREQUAL "WinHTTP")
  		SET(SHA1_BACKEND "Win32")
  	ELSEIF(HTTPS_BACKEND)
  		SET(SHA1_BACKEND ${HTTPS_BACKEND})
  	ELSE()
  	ENDIF()
  	IF(NOT HTTPS_BACKEND)
  		SET(SHA1_BACKEND "CollisionDetection")
  	ENDIF()
  	message(STATUS "Using SHA1 backend ${SHA1_BACKEND}")
  ELSEIF(USE_SHA1 STREQUAL "Generic")
  	SET(SHA1_BACKEND "Generic")
  # ELSEIF(NOT USE_SHA1)
  ELSE()
  	MESSAGE(FATAL_ERROR "Invalid value for USE_SHA1: ${USE_SHA1}")
  ENDIF()
  
  IF(SHA1_BACKEND STREQUAL "CollisionDetection")
  	SET(GIT_SHA1_COLLISIONDETECT 1)
  	ADD_DEFINITIONS(-DSHA1DC_NO_STANDARD_INCLUDES=1)
  	ADD_DEFINITIONS(-DSHA1DC_CUSTOM_INCLUDE_SHA1_C=\"common.h\")
  	ADD_DEFINITIONS(-DSHA1DC_CUSTOM_INCLUDE_UBC_CHECK_C=\"common.h\")
  	FILE(GLOB SRC_SHA1 hash/hash_collisiondetect.c hash/sha1dc/*)
  ELSEIF(SHA1_BACKEND STREQUAL "OpenSSL")
  	# OPENSSL_FOUND should already be set, we're checking HTTPS_BACKEND
  
  	SET(GIT_SHA1_OPENSSL 1)
  	IF(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
  		LIST(APPEND LIBGIT2_PC_LIBS "-lssl")
  	ELSE()
  		LIST(APPEND LIBGIT2_PC_REQUIRES "openssl")
  	ENDIF()
  ELSEIF(SHA1_BACKEND STREQUAL "CommonCrypto")
  	SET(GIT_SHA1_COMMON_CRYPTO 1)
  ELSEIF(SHA1_BACKEND STREQUAL "mbedTLS")
  	SET(GIT_SHA1_MBEDTLS 1)
  	FILE(GLOB SRC_SHA1 hash/hash_mbedtls.c)
  	LIST(APPEND LIBGIT2_SYSTEM_INCLUDES ${MBEDTLS_INCLUDE_DIR})
  	LIST(APPEND LIBGIT2_LIBS ${MBEDTLS_LIBRARIES})
  	# mbedTLS has no pkgconfig file, hence we can't require it
  	# https://github.com/ARMmbed/mbedtls/issues/228
  	# For now, pass its link flags as our own
  	LIST(APPEND LIBGIT2_PC_LIBS ${MBEDTLS_LIBRARIES})
  ELSEIF(SHA1_BACKEND STREQUAL "Win32")
  	SET(GIT_SHA1_WIN32 1)
  	FILE(GLOB SRC_SHA1 hash/hash_win32.c)
  ELSEIF(SHA1_BACKEND STREQUAL "Generic")
  	FILE(GLOB SRC_SHA1 hash/hash_generic.c)
  # ELSEIF(NOT USE_SHA1)
  ELSE()
  	MESSAGE(FATAL_ERROR "Asked for unknown SHA1 backend: ${SHA1_BACKEND}")
  ENDIF()
  
  ADD_FEATURE_INFO(SHA ON "using ${SHA1_BACKEND}")
  

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