From: Thomas Monjalon <thomas@monjalon.net>
Date: Wed, 5 Feb 2020 15:39:23 +0000 (+0100)
Subject: buildtools: allow pedantic empty pmdinfo
X-Git-Url: http://git.droids-corp.org/?p=dpdk.git;a=commitdiff_plain;h=95d45cde11c95c775308e7f6ae170b4f8cbac096

buildtools: allow pedantic empty pmdinfo

If a driver has no info generated by pmdinfogen,
and if this driver is compiled as pedantic,
then an failure would occur:
	drivers/rte_common_mlx5.pmd.c:1: error:
	ISO C forbids an empty translation unit [-Werror=pedantic]
Such error is triggered with the new mlx5 common directory.

In order to allow an "empty driver info" compiled in pedantic mode,
the script generating .pmd.c file is modified to add a static string
unconditionnaly.
The minimal generated code is:
	static __attribute__((unused)) const char *generator =
		"/path/to/dpdk/buildtools/gen-pmdinfo-cfile.sh";

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
---

diff --git a/buildtools/gen-pmdinfo-cfile.sh b/buildtools/gen-pmdinfo-cfile.sh
index 0b6dc2ce4f..43059cf364 100755
--- a/buildtools/gen-pmdinfo-cfile.sh
+++ b/buildtools/gen-pmdinfo-cfile.sh
@@ -6,7 +6,8 @@ arfile=$1
 output=$2
 pmdinfogen=$3
 
-echo > $output
+# The generated file must not be empty if compiled in pedantic mode
+echo 'static __attribute__((unused)) const char *generator = "'$0'";' > $output
 for ofile in `ar t $arfile` ; do
 	ar p $arfile $ofile | $pmdinfogen - - >> $output 2> /dev/null
 done