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| author | Chris Dickens <christopher.a.dickens@gmail.com> | 2020-04-09 12:05:16 -0700 |
|---|---|---|
| committer | Chris Dickens <christopher.a.dickens@gmail.com> | 2020-04-09 12:05:16 -0700 |
| commit | 33b3ba3fc71ada906bfeb05eee937661c32b2877 (patch) | |
| tree | cfed2960c7840c9e36e9ea0d814f8d4c4ea00735 | |
| parent | 6f0330c78467bb9b5154ffb1859f6b9850235b7a (diff) | |
| download | libusb-33b3ba3fc71ada906bfeb05eee937661c32b2877.tar.gz | |
configure.ac: Enhance compiler checks for pthreads
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>
| -rw-r--r-- | configure.ac | 14 | ||||
| -rw-r--r-- | libusb/version_nano.h | 2 |
2 files changed, 13 insertions, 3 deletions
diff --git a/configure.ac b/configure.ac index 2aaa9e6..d386053 100644 --- a/configure.ac +++ b/configure.ac @@ -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 diff --git a/libusb/version_nano.h b/libusb/version_nano.h index 07b0839..f5243a0 100644 --- a/libusb/version_nano.h +++ b/libusb/version_nano.h @@ -1 +1 @@ -#define LIBUSB_NANO 11488 +#define LIBUSB_NANO 11489 |