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toolchain-external: support gcc < 4.3

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We currently support gcc as old as 4.3. However, Buildroot works
perfectly well with even older gcc versions (tested with 4.1). So we
can add an option BR2_TOOLCHAIN_EXTERNAL_GCC_OLD to support that. The
help text of this option is written with plenty of discouragement.

We use _OLD and not something like _PRE_4_3, because at some point we
will likely remove the 4.3 option and what would then require a name
change.

We don't set any _AT_LEAST option in this case because it's no use -
there is no lower bound on the version in this case. We therefore leave
BR2_TOOLCHAIN_GCC_AT_LEAST empty (the implicit default). When it is
empty, we don't do a version check at all in check_gcc_version
(previously we errored out when it was empty).

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Arnout Vandecappelle
2016-11-24 00:40:34 +01:00
committed by Thomas Petazzoni
parent abeab9ce93
commit 006ba68a30
2 changed files with 12 additions and 2 deletions
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3
toolchain/helpers.mk
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@@ -145,8 +145,7 @@ check_kernel_headers_version = \
check_gcc_version = \
expected_version="$(strip $2)" ; \
if [ -z "$${expected_version}" ]; then \
printf "Internal error, gcc version unknown (no GCC_AT_LEAST_X_Y selected)\n"; \
exit 1 ; \
exit 0 ; \
fi; \
real_version=`$(1) --version | sed -r -e '1!d; s/^[^)]+\) ([^[:space:]]+).*/\1/;'` ; \
if [[ ! "$${real_version}" =~ ^$${expected_version}\. ]] ; then \