Config.in: introduce BR2_HOST_GCC_AT_LEAST_{12..15}

Fedora 42 is planned to be released on 2025-04-22 [1].
It is also planned to include the upcoming gcc 15 release.
Gcc 15 is changing the default C language from -std=gnu17
to -std=gnu23 [2].

This change is expected to possibly introduce build failures [3].
In order to be prepared to fix those, this commit introduces the
BR2_HOST_GCC_AT_LEAST_{12..15} symbols.

[1] https://fedorapeople.org/groups/schedule/f-42/f-42-key-tasks.html
[2] https://gcc.gnu.org/gcc-15/changes.html#c
[3] https://savannah.gnu.org/support/?111150

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Config.in

@@ -74,6 +74,26 @@ config BR2_HOST_GCC_AT_LEAST_11
 	default y if BR2_HOST_GCC_VERSION = "11"
 	select BR2_HOST_GCC_AT_LEAST_10
 
+config BR2_HOST_GCC_AT_LEAST_12
+	bool
+	default y if BR2_HOST_GCC_VERSION = "12"
+	select BR2_HOST_GCC_AT_LEAST_11
+
+config BR2_HOST_GCC_AT_LEAST_13
+	bool
+	default y if BR2_HOST_GCC_VERSION = "13"
+	select BR2_HOST_GCC_AT_LEAST_12
+
+config BR2_HOST_GCC_AT_LEAST_14
+	bool
+	default y if BR2_HOST_GCC_VERSION = "14"
+	select BR2_HOST_GCC_AT_LEAST_13
+
+config BR2_HOST_GCC_AT_LEAST_15
+	bool
+	default y if BR2_HOST_GCC_VERSION = "15"
+	select BR2_HOST_GCC_AT_LEAST_14
+
 # When adding new entries above, be sure to update
 # the HOSTCC_MAX_VERSION variable in the Makefile.
 

Makefile

@@ -353,7 +353,7 @@ export HOSTARCH := $(shell LC_ALL=C $(HOSTCC_NOCCACHE) -v 2>&1 | \
 
 # When adding a new host gcc version in Config.in,
 # update the HOSTCC_MAX_VERSION variable:
-HOSTCC_MAX_VERSION := 11
+HOSTCC_MAX_VERSION := 15
 
 HOSTCC_VERSION := $(shell V=$$($(HOSTCC_NOCCACHE) --version | \
 	sed -n -r 's/^.* ([0-9]*)\.([0-9]*)\.([0-9]*)[ ]*.*/\1 \2/p'); \