Fix compilation with --enable-gcc-warnings and -O1

optimization level.
* configure.in: If --enable-gcc-warnings, disable
-Wunsafe-loop-optimizations for -O1 optimization level.
* src/doprnt.c (doprnt): Change type of tem to int, initialize
to avoid compiler warning.  Add eassert.
* src/search.c (simple_search): Initialize match_byte to avoid
compiler warning.  Add eassert.

1 files changed, 6 insertions, 0 deletions

diff --git a/configure.in b/configure.in
index 20b4cf2d593..dde8bcca855 100644
--- a/configure.in
+++ b/configure.in
@@ -681,6 +681,12 @@ else
   nw="$nw -Wsuggest-attribute=const"
   nw="$nw -Wsuggest-attribute=pure"
 
+  # Some loops can't be optimized with -O1,
+  # so remove -Wunsafe-loop-optimizations.
+  if echo "$CFLAGS" | $EGREP 'O1' 1>/dev/null; then
+    nw="$nw -Wunsafe-loop-optimizations"
+  fi
+
   gl_MANYWARN_ALL_GCC([ws])
   gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
   for w in $ws; do