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CMake: Add an option to disable the use of thread-local storage.

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Using thread-local storage may not be desired in all environments
and/or use-cases, thus there should be an option to disable its use
on purpose.

Fixes #451.
This commit is contained in:
Björn Esser
2020-05-18 11:38:58 +02:00
parent dd040ba446
commit 78642dcb9b
1 changed files with 10 additions and 7 deletions
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17
CMakeLists.txt
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@@ -87,6 +87,7 @@ option(ENABLE_RDRAND "Enable RDRAND Hardware RNG Hash Seed"
option(ENABLE_THREADING "Enable partial threading support." OFF)
option(DISABLE_WERROR "Avoid treating compiler warnings as fatal errors" OFF)
option(DISABLE_BSYMBOLIC "Avoid linking with -Bsymbolic-function" OFF)
option(DISABLE_THREAD_LOCAL_STORAGE "Disable Thread-Local Storage (HAVE___THREAD)" OFF)
if (UNIX OR MINGW OR CYGWIN)
list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
@@ -217,14 +218,16 @@ check_c_source_compiles(
"int main() { int i, x = 0; i = __sync_add_and_fetch(&x,1); return x; }"
HAVE_ATOMIC_BUILTINS)
check_c_source_compiles(
"__thread int x = 0; int main() { return 0; }"
HAVE___THREAD)
if (NOT DISABLE_THREAD_LOCAL_STORAGE)
check_c_source_compiles(
"__thread int x = 0; int main() { return 0; }"
HAVE___THREAD)
if (HAVE___THREAD)
set(SPEC___THREAD __thread)
elseif (MSVC)
set(SPEC___THREAD __declspec(thread))
if (HAVE___THREAD)
set(SPEC___THREAD __thread)
elseif (MSVC)
set(SPEC___THREAD __declspec(thread))
endif()
endif()
# Hardware random number is not available on Windows? Says, config.h.win32. Best to preserve compatibility.