[V2] Makfile: add more warning flags to ensure we catch more issues

From: Colin Ian King <colin.king@canonical.com>

Increase the build warning checks to catch bad code. This builds
with gcc 9.3, gcc 10.0, clang 9 and clang 10 without issues.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---

V2: remove -Wmissing-format-attribute, I'll try and get that sorted
    for a later release.

---
 src/Makefile.am | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

On 2020-03-20 3:41 a.m., Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> Increase the build warning checks to catch bad code. This builds
> with gcc 9.3, gcc 10.0, clang 9 and clang 10 without issues.
> 
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> 
> V2: remove -Wmissing-format-attribute, I'll try and get that sorted
>     for a later release.
> 
> ---
>  src/Makefile.am | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/src/Makefile.am b/src/Makefile.am
> index 904fc020..e0093aef 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -15,7 +15,12 @@ AM_CPPFLAGS = \
>  	`pkg-config --silence-errors --cflags json-c`	\
>  	-pthread `pkg-config --cflags glib-2.0 gio-2.0` \
>  	-Wall -Werror -Wextra				\
> -	-Wno-address-of-packed-member
> +	-Wno-address-of-packed-member			\
> +	-Wfloat-equal -Wmissing-declarations		\
> +	-Wno-long-long -Wredundant-decls -Wshadow	\
> +	-Wno-missing-field-initializers 		\
> +	-Wno-missing-braces -Wno-sign-compare 		\
> +	-Wno-multichar -Wcast-qual
>  
>  bin_PROGRAMS = fwts
>  
> 

Acked-by: Alex Hung <alex.hung@canonical.com>

On 3/20/20 5:41 PM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> Increase the build warning checks to catch bad code. This builds
> with gcc 9.3, gcc 10.0, clang 9 and clang 10 without issues.
> 
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> 
> V2: remove -Wmissing-format-attribute, I'll try and get that sorted
>     for a later release.
> 
> ---
>  src/Makefile.am | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/src/Makefile.am b/src/Makefile.am
> index 904fc020..e0093aef 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -15,7 +15,12 @@ AM_CPPFLAGS = \
>  	`pkg-config --silence-errors --cflags json-c`	\
>  	-pthread `pkg-config --cflags glib-2.0 gio-2.0` \
>  	-Wall -Werror -Wextra				\
> -	-Wno-address-of-packed-member
> +	-Wno-address-of-packed-member			\
> +	-Wfloat-equal -Wmissing-declarations		\
> +	-Wno-long-long -Wredundant-decls -Wshadow	\
> +	-Wno-missing-field-initializers 		\
> +	-Wno-missing-braces -Wno-sign-compare 		\
> +	-Wno-multichar -Wcast-qual
>  
>  bin_PROGRAMS = fwts
>  
> 

Acked-by: Ivan Hu <ivan.hu@canonical.com>