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authorMarcel Raad <Marcel.Raad@teamviewer.com>2017-05-30 10:07:47 +0200
committerMarcel Raad <Marcel.Raad@teamviewer.com>2017-05-31 10:06:53 +0200
commit314a7fa3ceb74f90cc7cce28bef7517ef874f64c (patch)
tree9a3137d68f9d2190a8093360b1f7fae9136dee56 /m4
parenta6ad28a75e55859f6bb66a1eaf339154f59691a8 (diff)
downloadcurl-314a7fa3ceb74f90cc7cce28bef7517ef874f64c.tar.gz
curl-compilers.m4: enable -Wshift-sign-overflow for clang
clang 2.9+ supports -Wshift-sign-overflow, which warns about undefined behavior on signed left shifts when shifting by too many places. Ref: https://github.com/curl/curl/issues/1516 Closes https://github.com/curl/curl/pull/1517
Diffstat (limited to 'm4')
-rw-r--r--m4/curl-compilers.m45
1 files changed, 5 insertions, 0 deletions
diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 589032446..673f64097 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -881,6 +881,11 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
if test "$compiler_num" -ge "101"; then
tmp_CFLAGS="$tmp_CFLAGS -Wunused"
fi
+ #
+ dnl Only clang 2.9 or later
+ if test "$compiler_num" -ge "209"; then
+ tmp_CFLAGS="$tmp_CFLAGS -Wshift-sign-overflow"
+ fi
fi
;;
#