X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=configure.ac;h=afa88f60d26f01f254476454fe62ad6d47103730;hb=1a081ca67d63a0bd933a3d715792d85afd437296;hp=892faf540666ca1ff459f68cad601dd00e0ebba8;hpb=4abf8dd0a540db8c8f5af5e6bd78c6eb7b473d9f;p=libsigrok.git

diff --git a/configure.ac b/configure.ac
index 892faf54..afa88f60 100644
--- 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