Build: Define feature test macro _DEFAULT_SOURCE

This basically makes glibc expose the same set of features as
if gcc was invoked without any restricting -std=c* option. Unlike
_GNU_SOURCE however, it does not enable GNU-specific extensions.

So, with this macro defined the behavior of Linux with glibc
should match that of other platforms.

diff --git a/Makefile.am b/Makefile.am
index 0515e80b91bddd5af556c273886273ed0e99b7a8..873883eb9d9e475c0e81c876a055105ae3e430c8 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,7 +23,7 @@ AM_LIBTOOLFLAGS = --silent
 MAKEFLAGS = --no-print-directory
 
 DECODERS_DIR = $(pkgdatadir)/decoders
-AM_CPPFLAGS = -D_POSIX_C_SOURCE=200112L -DDECODERS_DIR='"$(DECODERS_DIR)"'
+AM_CPPFLAGS = -D_DEFAULT_SOURCE -DDECODERS_DIR='"$(DECODERS_DIR)"'
 
 # The tests CFLAGS are a superset of the libsigrokdecode CFLAGS.
 AM_CFLAGS = $(SRD_EXTRA_CFLAGS) $(SRD_WFLAGS) $(TESTS_CFLAGS)
@@ -70,7 +70,7 @@ tests_main_SOURCES = \
        tests/inst.c \
        tests/session.c
 
-tests_main_CPPFLAGS = -D_POSIX_C_SOURCE=200112L -DDECODERS_DIR='"$(abs_top_srcdir)/decoders"'
+tests_main_CPPFLAGS = -D_DEFAULT_SOURCE -DDECODERS_DIR='"$(abs_top_srcdir)/decoders"'
 tests_main_LDADD = libsigrokdecode.la $(SRD_EXTRA_LIBS) $(TESTS_LIBS)
 
 MAINTAINERCLEANFILES = ChangeLog