[gentoo-dev] [PATCH 3/3] A check that the compiler used to build ada is ada and not newer

[Alfredo Tupone <tupone@gentoo.org>]

Maybe a more detailed check can be done, as some version can be built with newer compiler
Could be envisaged to switch the compiler automatically "gcc-config x" instead of die

Signed-off-by: Alfredo Tupone <tupone@gentoo.org>
---
 eclass/toolchain.eclass | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index f8e06fa39884..ce665b3c594b 100644
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -540,30 +540,42 @@ get_gcc_src_uri() {
 
 	echo "${GCC_SRC_URI}"
 }
 
 SRC_URI=$(get_gcc_src_uri)
 
 #---->> pkg_pretend <<----
 
 toolchain_pkg_pretend() {
 	if ! _tc_use_if_iuse cxx ; then
 		_tc_use_if_iuse go && \
 			ewarn 'Go requires a C++ compiler, disabled due to USE="-cxx"'
 		_tc_use_if_iuse objc++ && \
 			ewarn 'Obj-C++ requires a C++ compiler, disabled due to USE="-cxx"'
 	fi
+	if _tc_use_if_iuse ada ; then
+		if ! _tc_use_if_iuse cxx ; then
+			ewarn 'Ada requires a C++ compiler, disabled due to USE="-cxx"'
+		else
+			prevAdaSLOT=$(gnatmake -v 2>&1 | sed -n '2 p' | sed 's:^[^0-9]*\([0-9]\+\).*:\1:' | sed 's:2021:10:' )
+			if [[ -z "${prevAdaSLOT}" ]] ; then
+				die 'Ada requires an Ada compiler'
+			elif [[ ${SLOT} -lt ${prevAdaSLOT} ]] ; then
+				die 'Ada cannot be built with a newer compiler'
+			fi
+		fi
+	fi
 }
 
 #---->> pkg_setup <<----
 
 toolchain_pkg_setup() {
 	# We don't want to use the installed compiler's specs to build gcc
 	unset GCC_SPECS
 
 	# bug #265283
 	unset LANGUAGES
 
 	# See https://www.gnu.org/software/make/manual/html_node/Parallel-Output.html
 	# Avoid really confusing logs from subconfigure spam, makes logs far
 	# more legible.
 	MAKEOPTS="--output-sync=line ${MAKEOPTS}"
-- 
2.43.2