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CMake: Conditionally allow win95 threads and --enable-small.

This commit is contained in:
Jia Tan 2023-08-09 20:54:15 +08:00
parent de574404c4
commit 356ad5b26b
1 changed files with 20 additions and 8 deletions
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28
CMakeLists.txt
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@ -348,6 +348,11 @@ set(ENABLE_THREADS ON CACHE STRING
set_property(CACHE ENABLE_THREADS
PROPERTY STRINGS "${SUPPORTED_THREAD_METHODS}")
# This is a flag variable set when win95 threads are used. We must ensure
# the combination of enable_small and win95 threads is not used without a
# compiler supporting attribute __constructor__.
set(USE_WIN95_THREADS OFF)
if(NOT ENABLE_THREADS IN_LIST SUPPORTED_THREAD_METHODS)
message(SEND_ERROR "'${ENABLE_THREADS}' is not a supported thread type")
endif()
@ -368,14 +373,7 @@ if(ENABLE_THREADS)
# Windows Vista. This is used for 32-bit x86 builds for
# compatibility reasons since it makes no measurable difference
# in performance compared to Vista threads.
#
# The Win95 threading lacks thread-safe one-time initialization
# function.
if(ENABLE_SMALL)
message(SEND_ERROR "Threading method win95 and ENABLE_SMALL "
"cannot be used at the same time")
endif()
set(USE_WIN95_THREADS ON)
add_compile_definitions(MYTHREAD_WIN95)
else()
add_compile_definitions(MYTHREAD_VISTA)
@ -763,6 +761,20 @@ check_c_source_compiles("
cmake_pop_check_state()
tuklib_add_definition_if(liblzma HAVE_FUNC_ATTRIBUTE_CONSTRUCTOR)
# The Win95 threading lacks a thread-safe one-time initialization function.
# The one-time initialization is needed for crc32_small.c and crc64_small.c
# create the CRC tables. So if small mode is enabled, the threading mode is
# win95, and the compiler does not support attribute constructor, then we
# would end up with a multithreaded build that is thread-unsafe. As a
# result this configuration is not allowed.
if(USE_WIN95_THREADS AND ENABLE_SMALL AND NOT HAVE_FUNC_ATTRIBUTE_CONSTRUCTOR)
message(SEND_ERROR "Threading method win95 and ENABLE_SMALL "
"cannot be used at the same time with a compiler "
"that doesn't support "
"__attribute__((__constructor__))")
endif()
# Check for __attribute__((__ifunc__())) support.
option(ALLOW_ATTR_IFUNC "Allow use of __attribute__((__ifunc__())) if \
supported by the system" ON)