configure.in : Add AM_SILENT_RULES. Check for <inttypes.h>. Add --enable-gcc-werror option.

configure.in

@@ -20,6 +20,7 @@
 
 AC_INIT(src/flac/main.c)
 AM_INIT_AUTOMAKE(flac, 1.2.1)
+AM_SILENT_RULES([yes])
 
 # Don't automagically regenerate autoconf/automake generated files unless
 # explicitly requested.  Eases autobuilding -mdz
@@ -57,6 +58,10 @@ if test $ac_cv_c_vararrays = yes; then
 fi
 AC_LANG_POP(C++)
 # c flavor
+AC_HEADER_STDC
+
+AC_CHECK_HEADERS(inttypes.h)
+
 AC_C_VARARRAYS
 
 AC_C_BIGENDIAN
@@ -133,6 +138,7 @@ AH_TEMPLATE(FLAC__ALIGN_MALLOC_DATA, [define to align allocated memory on 32-byt
 fi
 
 AC_ARG_ENABLE(asm-optimizations, AC_HELP_STRING([--disable-asm-optimizations], [Don't use any assembly optimization routines]), asm_opt=no, asm_opt=yes)
+dnl ' Terminate the damn single quote
 AM_CONDITIONAL(FLaC__NO_ASM, test "x$asm_opt" = xno)
 if test "x$asm_opt" = xno ; then
 AC_DEFINE(FLAC__NO_ASM)
@@ -210,6 +216,9 @@ FLAC__TEST_LEVEL=2
 fi
 AC_SUBST(FLAC__TEST_LEVEL)
 
+AC_ARG_ENABLE(gcc-werror,
+	AC_HELP_STRING([--enable-gcc-werror], [enable -Werror in all Makefiles]))
+
 AC_ARG_ENABLE(valgrind-testing,
 AC_HELP_STRING([--enable-valgrind-testing], [Run all tests inside Valgrind]),
 [case "${enableval}" in
@@ -270,7 +279,7 @@ AC_ARG_ENABLE([ogg],
 if test "x$want_ogg" != "xno"; then
 	XIPH_PATH_OGG(have_ogg=yes, AC_MSG_WARN([*** Ogg development enviroment not installed - Ogg support will not be built]))
 fi
- 
+
 AM_CONDITIONAL(FLaC__HAS_OGG, [test "x$have_ogg" = xyes])
 if test "x$have_ogg" = xyes ; then
 AC_DEFINE(FLAC__HAS_OGG)
@@ -330,6 +339,15 @@ else
 	fi
 fi
 
+
+if test x$ac_cv_c_compiler_gnu = xyes ; then
+	if test x$enable_gcc_werror = "xyes" ; then
+		CFLAGS="-Werror $CFLAGS"
+		CXXFLAGS="-Werror $CXXFLAGS"
+		fi
+	fi
+
+
 #@@@
 AM_CONDITIONAL(FLaC__HAS_AS__TEMPORARILY_DISABLED, test "yes" = "no")
 AM_CONDITIONAL(FLaC__HAS_GAS__TEMPORARILY_DISABLED, test "yes" = "no")