From: David Herrmann <dh.herrmann@gmail.com>
Date: Tue, 24 Feb 2015 14:59:06 +0000 (+0100)
Subject: build: add -Wno-format-signedness
X-Git-Tag: v219.0~596
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=0a98d66159e474915afd6597d3aa444a698fdd2d

build: add -Wno-format-signedness

gcc5 introduced this option (gcc4 silently ignores it, which is fine).
Given that gcc5 thinks 'unsigned char'/'unsigned short' is promoted to
'int' for var-args, stuff like this spits out warnings:
    uint8_t x;
    printf("%" PRIu8", x);

gcc5 promots 'x' to 'int', instead of 'unsigned int' and thus gets a
signedness-warnings as it expects an 'unsigned int'.

glibc states otherwise: unsigneds are always promoted to 'unsigned int'.
Until gcc and glibc figure this out, lets just ignore that warning (which
is totally useless in its current form).
---

diff --git a/configure.ac b/configure.ac
index 9a2235bcf..22a6f1781 100644
--- a/configure.ac
+++ b/configure.ac
@@ -186,6 +186,7 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
         -Wno-unused-parameter \
         -Wno-missing-field-initializers \
         -Wno-unused-result \
+        -Wno-format-signedness \
         -Werror=overflow \
         -Wdate-time \
         -Wnested-externs \