X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=configure.ac;h=690fe8fa7f1d41b8c4972fc9c0927bc9a42cb4ca;hp=eb3aa9ca3521779498970eaad3342561b8d5999a;hb=c7f4490afcccb5d27b0f17e99ea782b21449e27b;hpb=ee9660103cc8173ebc81f40037d54801ba739f48

diff --git a/configure.ac b/configure.ac
index eb3aa9c..690fe8f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -79,11 +79,6 @@ AS_IF([test "x$ax_cv___attribute__" != "xyes"],
 # Make sure we have pthread support
 AX_PTHREAD([], [AC_MSG_ERROR([Could not configure pthread support])])
 
-# Make sure the C compiler supports weak symbols
-AX_SYS_WEAK_ALIAS
-AS_IF([test "x$ax_cv_sys_weak_alias" = "xno"],
-  [AC_MSG_ERROR([Your platform doesn't support weak symbols.])])
-
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_INLINE
 AC_C_TYPEOF
@@ -96,6 +91,39 @@ AC_TYPE_UINT32_T
 AC_TYPE_UINT64_T
 AC_TYPE_UINT8_T
 
+# Detect warning flags supported by the C compiler and append them to
+# WARN_CFLAGS.
+m4_define([WARN_FLAGS_LIST], [ dnl
+  -Wall dnl
+  -Wextra dnl
+  -Wmissing-prototypes dnl
+  -Wmissing-declarations dnl
+  -Wnull-dereference dnl
+  -Wundef dnl
+  -Wshadow dnl
+  -Wjump-misses-init dnl
+  -Wsuggest-attribute=format dnl
+  -Wtautological-constant-out-of-range-compare dnl
+  -Wnested-externs dnl
+  -Wwrite-strings dnl
+  -Wformat=2 dnl
+  -Wstrict-aliasing dnl
+  -Wmissing-noreturn dnl
+  -Winit-self dnl
+  -Wduplicated-cond dnl
+  -Wduplicated-branches dnl
+  -Wlogical-op dnl
+  dnl
+  dnl-Wredundant-decls dnl
+  -Wno-null-dereference dnl
+])
+
+# Pass -Werror as an extra flag during the test: this is needed to make the
+# -Wunknown-warning-option diagnostic fatal with clang.
+AC_LANG_PUSH([C])
+AX_APPEND_COMPILE_FLAGS([WARN_FLAGS_LIST], [WARN_CFLAGS], [-Werror])
+AC_LANG_POP([C])
+
 
 ##               ##
 ## Header checks ##
@@ -118,7 +146,7 @@ AC_PROG_AWK
 AC_PROG_GREP
 AC_PROG_MAKE_SET
 AC_CHECK_PROGS(NPROC, [nproc gnproc])
-AC_CHECK_PROG(GETCONF, [getconf])
+AC_CHECK_PROGS(GETCONF, [getconf])
 AS_IF([test "x$NPROC" != "x"],
 	[NPROC_CMD=$NPROC],
 	[AS_IF([test "x$GETCONF" != "x"],
@@ -244,7 +272,7 @@ AC_SUBST(LT_NO_UNDEFINED)
 AM_CPPFLAGS="-I\$(top_builddir)/include -I\$(top_srcdir)/include -include config.h"
 AC_SUBST(AM_CPPFLAGS)
 
-AM_CFLAGS="-Wall -Wextra -Wno-unused-parameter $PTHREAD_CFLAGS"
+AM_CFLAGS="$WARN_CFLAGS $PTHREAD_CFLAGS"
 AC_SUBST(AM_CFLAGS)