Build: Move _POSIX_C_SOURCE definition to config.h

[libsigrok.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index b4ba2b3d9f7897fe3314c5ca941787bdce44acd4..d773d7f201cf674055f61195b6b27236fb7f8820 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -44,6 +44,12 @@ 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([$CC], [sr_cc_version])
 SR_PROG_VERSION([$CXX], [sr_cxx_version])