The questions about our minimum compiler requirement pops up every couple of months, and we then have to recall the details each time. So let's document this in a proper way, by adding a comment and check for the right compiler version to our compiler.h header.
Signed-off-by: Thomas Huth <th...@redhat.com> --- include/qemu/compiler.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index ca9bc85..775446b 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -22,6 +22,14 @@ # define QEMU_GNUC_PREREQ(maj, min) 0 #endif +/* + * We need at least GCC 4.1 for atomics support. Clang also supports these, + * and reports itself as GCC 4.2, so it passes this check, too. + */ +#if !QEMU_GNUC_PREREQ(4, 1) +#error QEMU needs a compiler that is compatible with GCC v4.1 or newer +#endif + #define QEMU_NORETURN __attribute__ ((__noreturn__)) #define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result)) -- 1.8.3.1
