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configure.ac: Enhance compiler checks for pthreads

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There apparently exist some compiler ports (e.g Haiku's GCC) that do not
support the ubiquitous '-pthread' compiler option. Add a check for this
and only use the option if supported.

Also tweak the check for the pthread library to check for the
pthread_create() function. Even though libusb does not use this function,
it seems to be sufficiently distinct such that the standard C library
would not provide this directly if the pthread implementation resided in
a separate library. Also explicitly check whether no additional library
linkage is required.

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
This commit is contained in:
Chris Dickens 2020-04-09 12:05:16 -07:00
parent 6f0330c784
commit 33b3ba3fc7
2 changed files with 13 additions and 3 deletions
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14
configure.ac
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@ -153,10 +153,20 @@ fi
if test "x$threads" = xposix; then
AC_DEFINE([THREADS_POSIX], [1], [Define to 1 if using POSIX threads.])
AC_SUBST(THREAD_CFLAGS, [-pthread])
dnl Some compilers do not support the '-pthread' option so check for it here
saved_CFLAGS="${CFLAGS}"
CFLAGS="-Wall -Werror -pthread"
AC_MSG_CHECKING([if $CC recognizes -pthread])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])],
[AC_MSG_RESULT([yes])
AC_SUBST(THREAD_CFLAGS, [-pthread])],
[AC_MSG_RESULT([no])])
CFLAGS="${saved_CFLAGS}"
dnl Android Linux and Darwin provide pthread functions directly in libc
dnl glibc also provides some pthread functions directly, so search for a thread-specific function
AC_SEARCH_LIBS([pthread_key_create], [pthread], [AC_SUBST(THREAD_LIBS, [-lpthread])], [], [])
AC_SEARCH_LIBS([pthread_create], [pthread],
[test "x$ac_cv_search_pthread_create" != "xnone required" && AC_SUBST(THREAD_LIBS, [-lpthread])],
[], [])
elif test "x$threads" = xwindows; then
AC_DEFINE([THREADS_WINDOWS], [1], [Define to 1 if using Windows threads.])
else

2
libusb/version_nano.h
View file

@ -1 +1 @@
#define LIBUSB_NANO 11488
#define LIBUSB_NANO 11489