[OpenWrt-Devel] [PATCH] build: make GCC version 6+ minimal host build requirement

[Paul Spooren]

Looks good to me, I ran into this issue before and would appreciate 
moving forward to 6.

On 11/11/19 10:16 PM, Petr Štetiar wrote:
> Currently minimal GNU supported GCC version is 7 (from May 2, 2017), buildbots
> are using default GCC version 6 on Debian 9 (old stable), current Debian
> stable 10 has GCC version 8.
>
> Signed-off-by: Petr Štetiar <ynezz at true.cz>
> ---
>
> While adding CI support in C based projects, I've started adding -Wextra as
> well, which seems to work just fine for gcc6+, but it's apparently causing
> issues with older GCCs like for example gcc 4.8.5[1] on CentOS 7.
>
> Although it's certainly possible to fix those issues and make gcc 4 usable, I
> think, that it's not worth the additional effort and resources anymore.
>
> 1. https://github.com/openwrt/openwrt/commit/4ba8f7b1ef1e4c0607185a41c06b51928c625d8b
>
>   README                  |  2 +-
>   include/prereq-build.mk | 18 ++++--------------
>   2 files changed, 5 insertions(+), 15 deletions(-)
>
> diff --git a/README b/README
> index c867c1fa4da8..6d11dd1188ff 100644
> --- a/README
> +++ b/README
> @@ -11,7 +11,7 @@ To build your own firmware you need a Linux, BSD or MacOSX system (case
>   sensitive filesystem required). Cygwin is unsupported because of the lack
>   of a case sensitive file system.
>   
> -You need gcc, binutils, bzip2, flex, python3.5+, perl, make, find, grep, diff,
> +You need gcc6+, binutils, bzip2, flex, python3.5+, perl, make, find, grep, diff,
>   unzip, gawk, getopt, subversion, libz-dev and libc headers installed.
>   
>   1. Run "./scripts/feeds update -a" to obtain all the latest package definitions
> diff --git a/include/prereq-build.mk b/include/prereq-build.mk
> index 4c5991005634..58cbc0678fa1 100644
> --- a/include/prereq-build.mk
> +++ b/include/prereq-build.mk
> @@ -27,12 +27,7 @@ $(eval $(call TestHostCommand,proper-umask, \
>   	umask | grep -xE 0?0[012][012]))
>   
>   $(eval $(call SetupHostCommand,gcc, \
> -	Please install the GNU C Compiler (gcc) 4.8 or later, \
> -	$(CC) -dumpversion | grep -E '^(4\.[8-9]|[5-9]\.?)', \
> -	gcc -dumpversion | grep -E '^(4\.[8-9]|[5-9]\.?)', \
> -	gcc48 --version | grep gcc, \
> -	gcc49 --version | grep gcc, \
> -	gcc5 --version | grep gcc, \
> +	Please install the GNU C Compiler (gcc) 6 or later, \
>   	gcc6 --version | grep gcc, \
>   	gcc7 --version | grep gcc, \
>   	gcc8 --version | grep gcc, \
> @@ -40,18 +35,13 @@ $(eval $(call SetupHostCommand,gcc, \
>   	gcc --version | grep -E 'Apple.(LLVM|clang)' ))
>   
>   $(eval $(call TestHostCommand,working-gcc, \
> -	\nPlease reinstall the GNU C Compiler (4.8 or later) - \
> +	\nPlease reinstall the GNU C Compiler (6 or later) - \
>   	it appears to be broken, \
>   	echo 'int main(int argc, char **argv) { return 0; }' | \
>   		gcc -x c -o $(TMP_DIR)/a.out -))
>   
>   $(eval $(call SetupHostCommand,g++, \
> -	Please install the GNU C++ Compiler (g++) 4.8 or later, \
> -	$(CXX) -dumpversion | grep -E '^(4\.[8-9]|[5-9]\.?)', \
> -	g++ -dumpversion | grep -E '^(4\.[8-9]|[5-9]\.?)', \
> -	g++48 --version | grep g++, \
> -	g++49 --version | grep g++, \
> -	g++5 --version | grep g++, \
> +	Please install the GNU C++ Compiler (g++) 6 or later, \
>   	g++6 --version | grep g++, \
>   	g++7 --version | grep g++, \
>   	g++8 --version | grep g++, \
> @@ -59,7 +49,7 @@ $(eval $(call SetupHostCommand,g++, \
>   	g++ --version | grep -E 'Apple.(LLVM|clang)' ))
>   
>   $(eval $(call TestHostCommand,working-g++, \
> -	\nPlease reinstall the GNU C++ Compiler (4.8 or later) - \
> +	\nPlease reinstall the GNU C++ Compiler (6 or later) - \
>   	it appears to be broken, \
>   	echo 'int main(int argc, char **argv) { return 0; }' | \
>   		g++ -x c++ -o $(TMP_DIR)/a.out - -lstdc++ && \
>
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