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configure.ac: link with -latomic if needed

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libusb unconditionally uses atomic_fetch_add since version 1.0.25 and
commit 1a08aa8 and commit eed8a37 but some architectures (e.g. sparc)
needs to link with -latomic to be able to use it. So check if -latomic
is needed and update libusb-1.0.pc accordingly to avoid the following
build failure with openocd:

/home/buildroot/autobuild/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/sparc-buildroot-linux-uclibc/10.3.0/../../../../sparc-buildroot-linux-uclibc/bin/ld: /home/buildroot/autobuild/instance-0/output-1/host/sparc-buildroot-linux-uclibc/sysroot/usr/lib/libusb-1.0.so: undefined reference to `__atomic_fetch_add_4'
collect2: error: ld returned 1 exit status

Full build log:
http://autobuild.buildroot.org/results/4a27a769bb3cdf78643c3049b87d792178d6512c

Closes #1064

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
This commit is contained in:
Fabrice Fontaine
2022-02-07 11:55:54 +01:00
committed by Tormod Volden
parent 0846456f3a
commit 561dbdacfb
2 changed files with 2 additions and 1 deletions
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1
configure.ac
View File

@@ -152,6 +152,7 @@ if test "x$platform" = xposix; then
AC_SEARCH_LIBS([pthread_create], [pthread],
[test "x$ac_cv_search_pthread_create" != "xnone required" && AC_SUBST(THREAD_LIBS, [-lpthread])],
[], [])
AC_SEARCH_LIBS([__atomic_fetch_add_4], [atomic])
elif test "x$platform" = xwindows; then
AC_DEFINE([PLATFORM_WINDOWS], [1], [Define to 1 if compiling for a Windows platform.])
else

2
libusb/version_nano.h
View File

@@ -1 +1 @@
#define LIBUSB_NANO 11695
#define LIBUSB_NANO 11696