[dpdk-dev] [PATCH] mk: toolchain: gcc: query the compiler macros to obtain the gcc version
Thomas Monjalon
thomas.monjalon at 6wind.com
Tue Mar 22 23:34:09 CET 2016
2016-03-22 17:13, Markos Chandras:
> This is similar to what's being used in the Linux kernel. Querying the
> GCC macros directly gives more accurate results compared to -dumpversion
> which could vary across distributions.
>
> Signed-off-by: Markos Chandras <mchandras at suse.de>
> ---
> In openSUSE Tumbleweed (and in any other SUSE distribution which
> uses (or will use) gcc >= 5), gcc -dumpversion returns '5'. This is on
> purpose as discussed in https://bugzilla.opensuse.org/show_bug.cgi?id=941428
Good to know. It could be in the commit log.
> As a result of which, the gcc-4.x comparison (40 against 5) does not
> work leading to tons of warnings and failures during build. This patch
> aims to change the way the gcc version is obtained by using the gcc macros
> directly.
Thanks for catching.
> -GCC_VERSION = $(subst .,,$(shell $(CC) -dumpversion | cut -f1-2 -d.))
> +GCC_MAJOR = $(shell echo __GNUC__ | $(CC) -E -x c - | tail -n 1)
> +GCC_MINOR = $(shell echo __GNUC_MINOR__ | $(CC) -E -x c - | tail -n 1)
> +GCC_VERSION = $(GCC_MAJOR)$(GCC_MINOR)
Are we sure the minor will always be only one digit?
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