From 59145179a793820f25c55b286d70d1d278f275d5 Mon Sep 17 00:00:00 2001
From: Joel Rosdahl <joel@rosdahl.net>
Date: Sat, 13 Oct 2018 14:02:47 +0200
Subject: Pass -Wno-implicit-fallthrough when compiling bundled zlib
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It’s of no use to get warnings for 3pp code.
---
 Makefile.in  |  1 +
 configure.ac | 10 +++++-----
 dev.mk.in    |  2 +-
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/Makefile.in b/Makefile.in
index 308fd562..dcec0af0 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -114,6 +114,7 @@ clean:
 conf.c: confitems_lookup.c envtoconfitems_lookup.c
 
 $(zlib_objs): CPPFLAGS += -include config.h
+$(zlib_objs): CFLAGS += @no_implicit_fallthrough_warning@
 
 src/zlib/libz.a: $(zlib_objs)
 	$(AR) cr $@ $(zlib_objs)
diff --git a/configure.ac b/configure.ac
index 5481e113..8dfba4bc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@ case $host in
 esac
 
 AC_SUBST(extra_libs)
-AC_SUBST(extra_cflags)
+AC_SUBST(no_implicit_fallthrough_warning)
 AC_SUBST(getopt_long_c)
 AC_SUBST(include_dev_mk)
 AC_SUBST(test_suites)
@@ -200,13 +200,13 @@ if test ! -f $srcdir/dev_mode_disabled && test "$RUN_FROM_BUILD_FARM" != yes; th
     version=`(git --git-dir=$srcdir/.git describe --dirty 2>/dev/null || echo vunknown) | sed -e 's/v//' -e 's/-/+/' -e 's/-/_/g'`
     echo "extern const char CCACHE_VERSION@<:@@:>@; const char CCACHE_VERSION@<:@@:>@ = \"$version\";" >src/version.c
 
-    dnl Check for -Wimplicit-fallthrough and disable if exists
-    AC_MSG_CHECKING([whether C compiler supports -Wimplicit-fallthrough])
+    dnl Check for -Wno-implicit-fallthrough
+    AC_MSG_CHECKING([whether C compiler supports -Wno-implicit-fallthrough])
     saved_cflags=$CFLAGS
-    CFLAGS=-Wimplicit-fallthrough
+    CFLAGS=-Wno-implicit-fallthrough
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
         [AC_MSG_RESULT([yes])]
-        [extra_cflags="-Wno-error=implicit-fallthrough"],
+        [no_implicit_fallthrough_warning="-Wno-implicit-fallthrough"],
         [AC_MSG_RESULT([no])]
     )
     CFLAGS=$saved_cflags
diff --git a/dev.mk.in b/dev.mk.in
index 9bd341ec..4ca34a46 100644
--- a/dev.mk.in
+++ b/dev.mk.in
@@ -1,6 +1,6 @@
 # GNU make syntax reigns in this file.
 
-all_cflags += -Werror @extra_cflags@
+all_cflags += -Werror
 all_cppflags += -MD -MP -MF .deps/$(subst .._,,$(subst /,_,$<)).d
 
 A2X = a2x
-- 
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