[Minios-devel] [UNIKRAFT PATCHv4 06/43] build: Add a makefile function to warn user when GCC is too old

[Wei Chen <Wei.Chen@xxxxxxx>]

Some GCC flags, like processor flags have minimum GCC version
requirement. Add this makefile function to stop build and print
a error message to notify user that their GCC is too old.

Signed-off-by: Wei Chen <Wei.Chen@xxxxxxx>
---
 support/build/Makefile.rules | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/support/build/Makefile.rules b/support/build/Makefile.rules
index d5372cd..f71fd6e 100644
--- a/support/build/Makefile.rules
+++ b/support/build/Makefile.rules
@@ -35,6 +35,13 @@ define test_gcc_version =
 $(shell echo 'if($(CC_VER_MAJOR).$(CC_VER_MINOR)>=$(1).$(2)) print "y"'| bc)
 endef
 
+# print error when GCC version doesn't meet the minimum requirement
+# error_if_gcc_version_lt $gcc_major,$gcc_minor.
+define error_if_gcc_version_lt =
+$(if $(call test_gcc_version,$(1),$(2)),,\
+     $(error Require GCC version >= $(1).$(2) found 
$(CC_VER_MAJOR).$(CC_VER_MINOR)))
+endef
+
 
################################################################################
 #
 # Paths and Filenames
-- 
2.17.1


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