From fdfc532ecd49fc3353627ef4a093366e73d6b91a Mon Sep 17 00:00:00 2001
From: Daniel Elstner <daniel.kitta@gmail.com>
Date: Sun, 13 Sep 2015 22:10:54 +0200
Subject: Build: Move _POSIX_C_SOURCE definition to config.h

Do not redefine it though when already set, so that it can be
overridden by the user, or indirectly by the compiler settings.
---
 Makefile.am  |  4 ++--
 configure.ac | 10 ++++++----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 2bbdb2c..e90e2e4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,7 +23,7 @@ AM_LIBTOOLFLAGS = --silent
 GNUMAKEFLAGS = --no-print-directory
 
 DECODERS_DIR = $(pkgdatadir)/decoders
-AM_CPPFLAGS = -D_POSIX_C_SOURCE=200112L -DDECODERS_DIR='"$(DECODERS_DIR)"'
+AM_CPPFLAGS = -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='"$(abs_top_srcdir)/decoders"'
+tests_main_CPPFLAGS = -DDECODERS_DIR='"$(abs_top_srcdir)/decoders"'
 tests_main_LDADD = libsigrokdecode.la $(SRD_EXTRA_LIBS) $(TESTS_LIBS)
 
 MAINTAINERCLEANFILES = ChangeLog
diff --git a/configure.ac b/configure.ac
index a57cea5..53e8bc1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,10 +33,6 @@ AM_INIT_AUTOMAKE([1.11 -Wall -Werror no-define subdir-objects check-news color-t
 AM_SILENT_RULES([yes])
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 
-AH_TOP([#ifndef SRD_CONFIG_H
-#define SRD_CONFIG_H    /* To stop multiple inclusions. */])
-AH_BOTTOM([#endif /* SRD_CONFIG_H */])
-
 AC_CANONICAL_HOST
 
 # Checks for programs.
@@ -47,6 +43,12 @@ AC_PROG_LN_S
 # Required for per-target flags or subdir-objects with C sources.
 AM_PROG_CC_C_O
 
+# Set the standard the C library headers should conform to.
+AH_VERBATIM([_POSIX_C_SOURCE], [/* The targeted POSIX standard. */
+#ifndef _POSIX_C_SOURCE
+# define _POSIX_C_SOURCE 200112L
+#endif])
+
 # Get compiler versions.
 SR_PROG_VERSION([$CC], [srd_cc_version])
 
-- 
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