amixer: define _GNU_SOURCE to get exp10

Get rid of a warning about implicit declaration of exp10, which is
behind _GNU_SOURCE as a non-standard feature. The same problem was fixed
for alsamixer in commit 116488e5f2.

Signed-off-by: Milton Vandersloot <miltonvandersloot@fake-box.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Milton Vandersloot 2019-03-27 17:36:54 +01:00 committed by Takashi Iwai
parent 11e6de5493
commit 551cc37fc6

View file

@ -1,3 +1,4 @@
AM_CFLAGS = -D_GNU_SOURCE
AM_CPPFLAGS = -I$(top_srcdir)/include
LDADD = -lm
# LDFLAGS = -static