mirror of https://git.tukaani.org/xz.git
CMake: Add XZ_EXTERNAL_SHA256
This commit is contained in:
Lasse Collin
parent
4535b80cae
commit
0232e66d5b
119
CMakeLists.txt
119
CMakeLists.txt
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@ -22,9 +22,6 @@
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# processors with CLMUL support, the C code should be faster than
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# the assembly code while on old processors the assembly code wins.
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#
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# - External SHA-256 code isn't supported but it's disabled by
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# default in the Autotools build too (--enable-external-sha256).
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#
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# About CMAKE_BUILD_TYPE:
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#
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# - CMake's standard choices are fine to use for production builds,
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@ -269,7 +266,7 @@ tuklib_large_file_support(ALL)
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# This is needed by liblzma and xz.
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tuklib_integer(ALL)
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# This is used for liblzma.pc generation to add -lrt if needed.
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# This is used for liblzma.pc generation to add -lrt and -lmd if needed.
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set(LIBS)
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# Check for clock_gettime(). Do this before checking for threading so
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@ -732,9 +729,123 @@ if("crc64" IN_LIST XZ_CHECKS)
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endif()
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endif()
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# External SHA-256
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#
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# At least the following implementations are supported:
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#
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# OS Headers Library Type Function
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# FreeBSD sys/types.h + sha256.h libmd SHA256_CTX SHA256_Init
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# NetBSD sys/types.h + sha2.h SHA256_CTX SHA256_Init
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# OpenBSD sys/types.h + sha2.h SHA2_CTX SHA256Init
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# Solaris sys/types.h + sha2.h libmd SHA256_CTX SHA256Init
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# MINIX 3 sys/types.h + sha2.h SHA256_CTX SHA256_Init
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# Darwin CommonCrypto/CommonDigest.h CC_SHA256_CTX CC_SHA256_Init
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#
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# Note that Darwin's CC_SHA256_Update takes buffer size as uint32_t instead
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# of size_t.
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#
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# This is disabled by default because it used to conflict with OpenSSL
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# on some platforms and in some cases the builtin code in liblzma was faster.
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# See INSTALL and the commit message ac398c3bafa6e4c80e20571373a96947db863b3d.
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option(XZ_EXTERNAL_SHA256 "Use SHA-256 code from the operating system \
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if possible. See INSTALL for possible subtle problems." OFF)
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if("sha256" IN_LIST XZ_CHECKS)
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add_compile_definitions("HAVE_CHECK_SHA256")
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# Assume that external code won't be used. We need this to know
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# if the internal sha256.c should be built.
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set(USE_INTERNAL_SHA256 ON)
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if(XZ_EXTERNAL_SHA256)
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# Find the header.
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set(SHA256_HEADER OFF)
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foreach(X CommonCrypto/CommonDigest.h sha256.h sha2.h)
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string(TOUPPER "HAVE_${X}" HAVE_X)
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string(REGEX REPLACE "[/.]" "_" HAVE_X "${HAVE_X}")
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check_include_file("${X}" "${HAVE_X}")
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if(${HAVE_X})
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target_compile_definitions(liblzma PRIVATE "${HAVE_X}")
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set(SHA256_HEADER "${X}")
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break()
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endif()
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endforeach()
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if(SHA256_HEADER)
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# Find the type to hold the SHA-256 state.
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set(SHA256_TYPE OFF)
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foreach(X CC_SHA256_CTX SHA256_CTX SHA2_CTX)
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string(TOUPPER "HAVE_${X}" HAVE_X)
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# configure.ac uses <sys/types.h> conditionally but it's
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# required on all cases except Darwin where it exists too.
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# So just use it unconditionally here.
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set(SOURCE
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"#include <sys/types.h>
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#include <${SHA256_HEADER}>
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int main(void)
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{
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${X} ctx;
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return 0;
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}")
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check_c_source_compiles("${SOURCE}" "${HAVE_X}")
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if(${HAVE_X})
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target_compile_definitions(liblzma PRIVATE "${HAVE_X}")
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set(SHA256_TYPE "${X}")
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break()
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endif()
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endforeach()
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if(SHA256_TYPE)
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# Find the initialization function. It might required libmd.
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foreach(X CC_SHA256_Init SHA256Init SHA256_Init)
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string(TOUPPER "HAVE_${X}" HAVE_X)
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# On FreeBSD, <sha256.h> defines the SHA-256 functions as
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# macros to rename them for namespace reasons. Avoid
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# check_symbol_exists as that would accept macros without
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# checking if the program links.
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set(SOURCE
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"#include <sys/types.h>
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#include <${SHA256_HEADER}>
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int main(void)
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{
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${SHA256_TYPE} ctx;
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${X}(&ctx);
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return 0;
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}")
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check_c_source_compiles("${SOURCE}" "${HAVE_X}")
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if(${HAVE_X})
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target_compile_definitions(liblzma PRIVATE "${HAVE_X}")
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set(USE_INTERNAL_SHA256 OFF)
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break()
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else()
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# Try with libmd. Other checks don't need it so we
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# don't need to leave it into CMAKE_REQUIRED_LIBRARIES.
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list(INSERT CMAKE_REQUIRED_LIBRARIES 0 md)
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check_c_source_compiles("${SOURCE}" "${HAVE_X}_LIBMD")
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list(REMOVE_AT CMAKE_REQUIRED_LIBRARIES 0)
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if(${HAVE_X}_LIBMD)
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# NOTE: Just "${HAVE_X}", not "${HAVE_X}_LIBMD":
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target_compile_definitions(liblzma PRIVATE
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"${HAVE_X}")
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target_link_libraries(liblzma PRIVATE md)
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set(LIBS "-lmd ${LIBS}") # For liblzma.pc
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set(USE_INTERNAL_SHA256 OFF)
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break()
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endif()
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endif()
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endforeach()
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endif()
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endif()
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endif()
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if(USE_INTERNAL_SHA256)
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target_sources(liblzma PRIVATE src/liblzma/check/sha256.c)
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endif()
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endif()
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