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build: Disable compiler TLS by default

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The global struct is quite large (~700 bytes on 64-bit systems which
will be allocated for each thread whether it uses libxml2 or not) and
already close to the total size limit on some platforms.

Disable compiler TLS by default.
This commit is contained in:
Nick Wellnhofer 2023-12-05 20:40:20 +01:00
parent 7f00273cf0
commit cf6e58d63c
2 changed files with 26 additions and 23 deletions
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47
CMakeLists.txt
View File

@ -52,6 +52,7 @@ option(LIBXML2_WITH_SCHEMATRON "Add Schematron support" ON)
option(LIBXML2_WITH_TESTS "Build tests" ON)
option(LIBXML2_WITH_THREADS "Add multithread support" ON)
option(LIBXML2_WITH_THREAD_ALLOC "Add per-thread memory" OFF)
option(LIBXML2_WITH_TLS "Enable thread-local storage" OFF)
option(LIBXML2_WITH_TREE "Add the DOM like tree manipulation APIs" ON)
set(LIBXML2_WITH_UNICODE ON)
option(LIBXML2_WITH_VALID "Add the DTD validation support" ON)
@ -182,28 +183,30 @@ if (NOT MSVC)
endif()
endif()
check_c_source_compiles(
"_Thread_local int v; int main(){return 0;}"
XML_THREAD_LOCAL_C11
)
if (XML_THREAD_LOCAL_C11)
set(XML_THREAD_LOCAL "_Thread_local")
else()
check_c_source_compiles(
"__thread int v; int main(){return 0;}"
XML_THREAD_LOCAL_THREAD
)
if (XML_THREAD_LOCAL_THREAD)
set(XML_THREAD_LOCAL "__thread")
else()
check_c_source_compiles(
"__declspec(thread) int v; int main(){return 0;}"
XML_THREAD_LOCAL_DECLSPEC
)
if (XML_THREAD_LOCAL_DECLSPEC)
set(XML_THREAD_LOCAL "__declspec(thread)")
endif()
endif()
if(LIBXML2_WITH_TLS)
check_c_source_compiles(
"_Thread_local int v; int main(){return 0;}"
XML_THREAD_LOCAL_C11
)
if (XML_THREAD_LOCAL_C11)
set(XML_THREAD_LOCAL "_Thread_local")
else()
check_c_source_compiles(
"__thread int v; int main(){return 0;}"
XML_THREAD_LOCAL_THREAD
)
if (XML_THREAD_LOCAL_THREAD)
set(XML_THREAD_LOCAL "__thread")
else()
check_c_source_compiles(
"__declspec(thread) int v; int main(){return 0;}"
XML_THREAD_LOCAL_DECLSPEC
)
if (XML_THREAD_LOCAL_DECLSPEC)
set(XML_THREAD_LOCAL "__declspec(thread)")
endif()
endif()
endif()
endif()
set(

2
configure.ac
View File

@ -408,7 +408,7 @@ XML_INCLUDEDIR='-I${includedir}/libxml2'
XML_CFLAGS=""
dnl Thread-local storage
if test "$with_tls" != "no"; then
if test "$with_tls" = "yes"; then
AC_COMPILE_IFELSE([
AC_LANG_SOURCE([_Thread_local int v;]) ], [
AC_DEFINE([XML_THREAD_LOCAL], [_Thread_local], [TLS specifier]) ], [