[RFC PATCH 1/1] build: increase minimum C standard for DPDK builds

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

Set the default C language standard to be used for DPDK builds to C99.
This requires no actual code changes to build successfully.

To ensure compatibility is kept for external apps using DPDK headers, we
explicitly set the build parameters for the chkincs binary to the old
minimum standard of "gnu89". [NOTE: DPDK code does not compile and has
previously not compiled for pure c89 standard, so that stricter
requirement need not be checked.] By adding this additional check, we
can separately manage C standards used internally in DPDK builds and
that required in the build flags for external apps using DPDK.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 buildtools/chkincs/meson.build | 1 +
 meson.build                    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/buildtools/chkincs/meson.build b/buildtools/chkincs/meson.build
index 378c2f19ef..322ac775ce 100644
--- a/buildtools/chkincs/meson.build
+++ b/buildtools/chkincs/meson.build
@@ -30,6 +30,7 @@ executable('chkincs', sources,
         c_args: cflags,
         include_directories: includes,
         dependencies: deps,
+        override_options: 'c_std=gnu89',
         install: false)
 
 # run tests for c++ builds also
diff --git a/meson.build b/meson.build
index f91d652bc5..9a2963cc16 100644
--- a/meson.build
+++ b/meson.build
@@ -9,6 +9,7 @@ project('DPDK', 'C',
         license: 'BSD',
         default_options: [
             'buildtype=release',
+            'c_std=c99',
             'default_library=static',
             'warning_level=2',
         ],
-- 
2.37.2