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configure.ac: explicitly add pthread cflags/libs in the libusb test
If libusb-config does not exist, LIBUSB_CFLAGS and PTHREAD_CFLAGS will be
empty, and the test for libusb will be performed without additional flags.
However, when libusb needs threads, some extra flags are needed (depending
on the platform), like -pthreads, -lpthread, etc. Without these flags, the
test for libusb_init() will fail to link correctly, and pcsc-lite will fail
detecting libusb.
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Upstream-status: will be submitted
---
diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -254,8 +254,8 @@ if test "x$use_libusb" != xno ; then
saved_CPPFLAGS="$CPPFLAGS"
saved_LIBS="$LIBS"
- CPPFLAGS="$CPPFLAGS $LIBUSB_CFLAGS"
- LIBS="$LDFLAGS $LIBUSB_LIBS"
+ CPPFLAGS="$CPPFLAGS $LIBUSB_CFLAGS $PTHREAD_CFLAGS"
+ LIBS="$LDFLAGS $LIBUSB_LIBS $PTHREAD_LIBS"
AC_CHECK_HEADERS(libusb.h, [],
[ AC_MSG_ERROR([libusb.h not found, use ./configure LIBUSB_CFLAGS=...]) ])
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