Re: [PATCH v2] travis-ci: enable more warnings on travis linux-gcc job

[Duy Nguyen <pclouds@gmail.com>]

On Sat, Mar 17, 2018 at 03:29:31PM +0100, Lars Schneider wrote:
> I interpreted Peff's comment like this:
> 
> If DEVELOPER=1 is set and we detect a gcc-6 in the makefile, 
> then we could set your additional flags in the makefile.
> 
> This way every developer with a new compiler would run these
> flags locally (if DEVELOPER=1 is set).

Aha. Something like this? I split developer cflags out to a separate
file because I imagine people may start to add gcc7, clang....

-- 8< --
diff --git a/.travis.yml b/.travis.yml
index 5f5ee4f3bd..0b3c50f5e7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,10 +16,13 @@ compiler:
 
 addons:
   apt:
+    sources:
+    - ubuntu-toolchain-r-test
     packages:
     - language-pack-is
     - git-svn
     - apache2
+    - gcc-6
 
 matrix:
   include:
diff --git a/Makefile b/Makefile
index de4b8f0c02..e8321e44d6 100644
--- a/Makefile
+++ b/Makefile
@@ -436,15 +436,6 @@ GIT-VERSION-FILE: FORCE
 # CFLAGS and LDFLAGS are for the users to override from the command line.
 
 CFLAGS = -g -O2 -Wall
-DEVELOPER_CFLAGS = -Werror \
-	-Wdeclaration-after-statement \
-	-Wno-format-zero-length \
-	-Wold-style-definition \
-	-Woverflow \
-	-Wpointer-arith \
-	-Wstrict-prototypes \
-	-Wunused \
-	-Wvla
 LDFLAGS =
 ALL_CFLAGS = $(CPPFLAGS) $(CFLAGS)
 ALL_LDFLAGS = $(LDFLAGS)
@@ -1045,7 +1036,8 @@ include config.mak.uname
 -include config.mak
 
 ifdef DEVELOPER
-CFLAGS += $(DEVELOPER_CFLAGS)
+include config.mak.dev
+CFLAGS += $(DEV_CFLAGS)
 endif
 
 comma := ,
diff --git a/config.mak.dev b/config.mak.dev
index e69de29bb2..644d0d581f 100644
--- a/config.mak.dev
+++ b/config.mak.dev
@@ -0,0 +1,23 @@
+DEV_CFLAGS =
+DEV_CFLAGS += -Werror
+DEV_CFLAGS += -Wdeclaration-after-statement
+DEV_CFLAGS += -Wno-format-zero-length
+DEV_CFLAGS += -Wold-style-definition
+DEV_CFLAGS += -Woverflow
+DEV_CFLAGS += -Wpointer-arith
+DEV_CFLAGS += -Wstrict-prototypes
+DEV_CFLAGS += -Wunused
+DEV_CFLAGS += -Wvla
+
+GCC_VER := $(shell sh -c '$(CC) --version | grep ^gcc >/dev/null && $(CC) -dumpversion | cut -f 1 -d .')
+
+ifeq ($(GCC_VER),6)
+DEV_CFLAGS += -Wextra
+DEV_CFLAGS += -Wmissing-prototypes
+DEV_CFLAGS += -Wno-empty-body
+DEV_CFLAGS += -Wno-maybe-uninitialized
+DEV_CFLAGS += -Wno-missing-field-initializers
+DEV_CFLAGS += -Wno-sign-compare
+DEV_CFLAGS += -Wno-unused-function
+DEV_CFLAGS += -Wno-unused-parameter
+endif
-- 8< --