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[libvirt] [PATCH] build: add pragma directive to fix build on some gcc

Commit 1268820a removed obsolete index() function and replaced it by
strchr.  Few versions of gcc has a bug and reports a warning about

../../src/util/virstring.c:1006: error: logical '&&' with non-zero
constant will always evaluate as true [-Wlogical-op]

Signed-off-by: Pavel Hrdina <phrdina redhat com>

Pushed as build-breaker fix.

 src/util/virstring.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/util/virstring.c b/src/util/virstring.c
index 7b0cad7..5794f96 100644
--- a/src/util/virstring.c
+++ b/src/util/virstring.c
@@ -986,6 +986,16 @@ virStringHasControlChars(const char *str)
+/* Work around spurious strchr() diagnostics given by -Wlogical-op
+ * for gcc < 4.6.  Doing it via a local pragma keeps the damage
+ * smaller than disabling it on the package level.  Unfortunately, the
+ * affected GCCs don't allow diagnostic push/pop which would have
+ * further reduced the impact. */
+# pragma GCC diagnostic ignored "-Wlogical-op"
  * virStringStripControlChars:
  * @str: the string to strip

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