[dpdk-dev] [PATCH] build: explicitly enable SSE4 for x86 meson builds

[Bruce Richardson <bruce.richardson@intel.com>]

If the compiler does not recognise the specific CPU when building with the
default "native" machine type, SSE4.2 instructions can be missing, causing
a build error. Rather than advising the user to change the machine type,
we can just turn on SSE4.2 directly. This can prevent issues with running
automated tests with older compilers/distros on newer hardware.

Fixes: a25a650be5f0 ("build: add infrastructure for meson and ninja builds")

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 config/x86/meson.build | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/config/x86/meson.build b/config/x86/meson.build
index 8b0fa3e6f..0d60204a5 100644
--- a/config/x86/meson.build
+++ b/config/x86/meson.build
@@ -15,11 +15,9 @@ if not is_windows
 endif
 
 # we require SSE4.2 for DPDK
-sse_errormsg = '''SSE4.2 instruction set is required for DPDK.
-Please set the machine type to "nehalem" or "corei7" or higher value'''
-
 if cc.get_define('__SSE4_2__', args: machine_args) == ''
-	error(sse_errormsg)
+	message('SSE 4.2 not enabled by default, explicitly enabling')
+	machine_args += -msse4
 endif
 
 base_flags = ['SSE', 'SSE2', 'SSE3','SSSE3', 'SSE4_1', 'SSE4_2']
-- 
2.23.0