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configure: Add flag for enabling thread_local.

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- When aiming for glibc compatibility, don't use thread_local.
- Add a flag --enable-threadlocal, which, when specified, will
  enable/disable thread_local regardless of the value of glibc_compat.
- FreeBSD has a buggy thread_local, don't use it.
This commit is contained in:
Carl Dong 2019-05-20 13:22:29 -04:00
parent 149b3477ec
commit 480e3415d7
1 changed files with 49 additions and 36 deletions
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85
configure.ac
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@ -194,6 +194,12 @@ AC_ARG_ENABLE([glibc-back-compat],
[use_glibc_compat=$enableval], [use_glibc_compat=$enableval],
[use_glibc_compat=no]) [use_glibc_compat=no])
AC_ARG_ENABLE([threadlocal],
[AS_HELP_STRING([--enable-threadlocal],
[enable features that depend on the c++ thread_local keyword (currently just thread names in debug logs). (default is to enabled if there is platform support and glibc-back-compat is not enabled)])],
[use_thread_local=$enableval],
[use_thread_local=auto])
AC_ARG_ENABLE([asm], AC_ARG_ENABLE([asm],
[AS_HELP_STRING([--disable-asm], [AS_HELP_STRING([--disable-asm],
[disable assembly routines (enabled by default)])], [disable assembly routines (enabled by default)])],
@ -827,42 +833,49 @@ AC_LINK_IFELSE([AC_LANG_SOURCE([
] ]
) )
TEMP_LDFLAGS="$LDFLAGS" if test "x$use_thread_local" = xyes || { test "x$use_thread_local" = xauto && test "x$use_glibc_compat" = xno; }; then
LDFLAGS="$TEMP_LDFLAGS $PTHREAD_CFLAGS" TEMP_LDFLAGS="$LDFLAGS"
AC_MSG_CHECKING([for thread_local support]) LDFLAGS="$TEMP_LDFLAGS $PTHREAD_CFLAGS"
AC_LINK_IFELSE([AC_LANG_SOURCE([ AC_MSG_CHECKING([for thread_local support])
#include <thread> AC_LINK_IFELSE([AC_LANG_SOURCE([
static thread_local int foo = 0; #include <thread>
static void run_thread() { foo++;} static thread_local int foo = 0;
int main(){ static void run_thread() { foo++;}
for(int i = 0; i < 10; i++) { std::thread(run_thread).detach();} int main(){
return foo; for(int i = 0; i < 10; i++) { std::thread(run_thread).detach();}
} return foo;
])], }
[ ])],
case $host in [
*mingw*) case $host in
# mingw32's implementation of thread_local has also been shown to behave *mingw*)
# erroneously under concurrent usage; see: # mingw32's implementation of thread_local has also been shown to behave
# https://gist.github.com/jamesob/fe9a872051a88b2025b1aa37bfa98605 # erroneously under concurrent usage; see:
AC_MSG_RESULT(no) # https://gist.github.com/jamesob/fe9a872051a88b2025b1aa37bfa98605
;; AC_MSG_RESULT(no)
*darwin*) ;;
# TODO enable thread_local on later versions of Darwin where it is *darwin*)
# supported (per https://stackoverflow.com/a/29929949) # TODO enable thread_local on later versions of Darwin where it is
AC_MSG_RESULT(no) # supported (per https://stackoverflow.com/a/29929949)
;; AC_MSG_RESULT(no)
*) ;;
AC_DEFINE(HAVE_THREAD_LOCAL,1,[Define if thread_local is supported.]) *freebsd*)
AC_MSG_RESULT(yes) # FreeBSD's implementation of thread_local is also buggy (per
;; # https://groups.google.com/d/msg/bsdmailinglist/22ncTZAbDp4/Dii_pII5AwAJ)
esac AC_MSG_RESULT(no)
], ;;
[ *)
AC_MSG_RESULT(no) AC_DEFINE(HAVE_THREAD_LOCAL,1,[Define if thread_local is supported.])
] AC_MSG_RESULT(yes)
) ;;
LDFLAGS="$TEMP_LDFLAGS" esac
],
[
AC_MSG_RESULT(no)
]
)
LDFLAGS="$TEMP_LDFLAGS"
fi
# Check for different ways of gathering OS randomness # Check for different ways of gathering OS randomness
AC_MSG_CHECKING(for Linux getrandom syscall) AC_MSG_CHECKING(for Linux getrandom syscall)