autogen.sh: aclocal support for Windows XP/Vista/7.

[libsigrok.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 053b93d2ca293822cf5e12fb3ea816d596588a0a..afa88f60d26f01f254476454fe62ad6d47103730 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,8 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ##
 
-AC_PREREQ(2.61)
+# We require at least autoconf 2.63 (AC_INIT format changed there).
+AC_PREREQ([2.63])
 
 # libsigrok package version number (NOT the same as shared lib version!).
 m4_define([libsigrok_major_version], [0])
@@ -31,14 +32,17 @@ AC_CONFIG_HEADER([config.h])
 AC_CONFIG_MACRO_DIR([autostuff])
 AC_CONFIG_AUX_DIR([autostuff])
 
-AM_INIT_AUTOMAKE([-Wall -Werror foreign std-options])
+# We require at least automake 1.11 (needed for 'silent rules').
+AM_INIT_AUTOMAKE([1.11 -Wall -Werror foreign std-options])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 AH_TOP([#ifndef LIBSIGROK_CONFIG_H
 #define LIBSIGROK_CONFIG_H    /* To stop multiple inclusions. */])
 AH_BOTTOM([#endif /* LIBSIGROK_CONFIG_H */])
 
-CFLAGS="-g -Wall -Wextra"
+# Enable more compiler warnings via -Wall and -Wextra. Add -fvisibility=hidden
+# and enforce use of SR_API to explicitly mark all public API functions.
+CFLAGS="-g -Wall -Wextra -fvisibility=hidden"
 
 # Checks for programs.
 AC_PROG_CXX
@@ -284,8 +288,6 @@ AC_OUTPUT
 echo
 echo "libsigrok configuration summary:"
 echo
-echo "Generic info:"
-echo
 echo "  - Package version (major.minor.micro):    $LIBSIGROK_VERSION"
 echo "  - Library version (current:revision:age): $LIBSIGROK_LT_VERSION"
 echo "  - Prefix: $prefix"