X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=configure;h=96f93b24cc705bde21bd3308bbeb0efacab09d5c;hp=b61ffb82bdc11dafbd7ea0cc3a5ab3eb06ab54fc;hb=1a70198b3e5a7866bf4c62d090d8a8e28b12521a;hpb=6c0cba819fb593f1efa33e0acd0bf59597279d97

diff --git a/configure b/configure
index b61ffb82..96f93b24 100755
--- a/configure
+++ b/configure
@@ -270,9 +270,19 @@ fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
 fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
 fi
 
+#
+# Even with -std=c99, gcc accepts some constructs which are constraint
+# violations. We want to treat these as errors regardless of whether
+# other purely stylistic warnings are enabled -- especially implicit
+# function declarations, which are a dangerous programming error.
+#
+tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
+tryflag CFLAGS_AUTO -Werror=implicit-int
+tryflag CFLAGS_AUTO -Werror=pointer-sign
+tryflag CFLAGS_AUTO -Werror=pointer-arith
+
 if test "x$warnings" = xyes ; then
 tryflag CFLAGS_AUTO -Wall
-tryflag CFLAGS_AUTO -Wpointer-arith
 tryflag CFLAGS_AUTO -Wcast-align
 tryflag CFLAGS_AUTO -Wno-parentheses
 tryflag CFLAGS_AUTO -Wno-uninitialized