CMake: Add XZ_EXTERNAL_SHA256

This commit is contained in:
Lasse Collin 2024-06-20 18:12:22 +03:00
parent 4535b80cae
commit 0232e66d5b
1 changed files with 116 additions and 5 deletions

View File

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