Issue 28017: Use -std=gnu99 to get C99 with GNU extensions for bluetooth.h on big endian.

aclocal.m4

@@ -13,7 +13,7 @@
 
 m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
 dnl pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
-dnl serial 11 (pkg-config-0.29.1)
+dnl serial 11 (pkg-config-0.29)
 dnl
 dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
 dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
@@ -55,7 +55,7 @@ dnl
 dnl See the "Since" comment for each macro you use to see what version
 dnl of the macros you require.
 m4_defun([PKG_PREREQ],
-[m4_define([PKG_MACROS_VERSION], [0.29.1])
+[m4_define([PKG_MACROS_VERSION], [0.29])
 m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
     [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
 ])dnl PKG_PREREQ

configure

@@ -6858,7 +6858,9 @@ UNIVERSAL_ARCH_FLAGS=
 # tweak BASECFLAGS based on compiler and platform
 case $GCC in
 yes)
-    CFLAGS_NODIST="$CFLAGS_NODIST -std=c99"
+    # GNU dialect of C99, enables GNU extensions like __attribute__. GNU99
+    # is required by bluetooth.h on big endian machines.
+    CFLAGS_NODIST="$CFLAGS_NODIST -std=gnu99"
 
     # Python doesn't violate C99 aliasing rules, but older versions of
     # GCC produce warnings for legal Python code.  Enable

configure.ac

@@ -1523,7 +1523,9 @@ AC_SUBST(UNIVERSAL_ARCH_FLAGS)
 # tweak BASECFLAGS based on compiler and platform
 case $GCC in
 yes)
-    CFLAGS_NODIST="$CFLAGS_NODIST -std=c99"
+    # GNU dialect of C99, enables GNU extensions like __attribute__. GNU99
+    # is required by bluetooth.h on big endian machines.
+    CFLAGS_NODIST="$CFLAGS_NODIST -std=gnu99"
 
     # Python doesn't violate C99 aliasing rules, but older versions of
     # GCC produce warnings for legal Python code.  Enable