[vlc-devel] [PATCH] configure: check the C compiler needs -latomic to support atomics

[Rémi Denis-Courmont]

Hi,

Most likely that library should only be linked in some target binaries, otherwise packaging system will whine. Same as thread and socket stuff.

Le 13 janvier 2020 14:50:49 GMT+02:00, Steve Lhomme <robux4 at ycbcr.xyz> a écrit :
>At least gcc 8 for the Raspberry Pi needs it.
>---
> configure.ac | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
>diff --git a/configure.ac b/configure.ac
>index c2a2a231cee..a7cf39d2174 100644
>--- a/configure.ac
>+++ b/configure.ac
>@@ -70,6 +70,23 @@ AC_C_INLINE
> AC_C_RESTRICT
> AX_CXX_COMPILE_STDCXX_14([noext], [mandatory])
> 
>+dnl Check the compiler supports atomics in C
>+AC_MSG_CHECKING([C atomics])
>+AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <stdatomic.h>],[
>+atomic_uintmax_t test;
>+atomic_init(&test, 0);
>+atomic_fetch_add_explicit(&test, 2u, memory_order_relaxed);
>+])], [AC_MSG_RESULT([built-in])], [
>+  LDFLAGS="$LDFLAGS -latomic"
>+  AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <stdatomic.h>],[
>+atomic_uintmax_t test;
>+atomic_init(&test, 0);
>+atomic_fetch_add_explicit(&test, 2u, memory_order_relaxed);
>+])],[AC_MSG_RESULT([using -latomic])],[
>+  AC_MSG_ERROR([VLC requires atomics support])
>+  ])
>+])
>+
> dnl Extend the --help string at the current spot.
> AC_DEFUN([EXTEND_HELP_STRING], [m4_divert_once([HELP_ENABLE], [$1])])
> 
>-- 
>2.17.1
>
>_______________________________________________
>vlc-devel mailing list
>To unsubscribe or modify your subscription options:
>https://mailman.videolan.org/listinfo/vlc-devel

-- 
Envoyé de mon appareil Android avec Courriel K-9 Mail. Veuillez excuser ma brièveté.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.videolan.org/pipermail/vlc-devel/attachments/20200113/590fdd33/attachment.html>