Specify compilers explicitly

.circleci/config.yml

@@ -14,19 +14,14 @@ jobs:
             DEBIAN_FRONTEND="noninteractive" TZ="America/New_York" apt-get -y install tzdata
             apt install -y --no-install-recommends software-properties-common wget gpg-agent shellcheck
             apt install -y --no-install-recommends git make pkg-config libncurses-dev libreadline-dev
-            apt install -y --no-install-recommends gcc gcc-7 gcc-8 gcc-10
-            apt install -y --no-install-recommends clang clang-6.0 clang-7 clang-8 clang-9 clang-tidy-10
+            apt install -y --no-install-recommends gcc-7 gcc-8 gcc-9 gcc-10
+            apt install -y --no-install-recommends clang-6.0 clang-7 clang-8 clang-9 clang-10 clang-tidy-10
       - checkout
       - run:
           command: |
             export CFLAGS=-Werror
             make clean
             echo
-            echo "########## gcc ##########"
-            CC=gcc make strip
-            ls -l nnn
-            make clean
-            echo
             echo "########## gcc-7 ##########"
             CC=gcc-7 make strip
             ls -l nnn
@@ -37,13 +32,13 @@ jobs:
             ls -l nnn
             make clean
             echo
-            echo "########## gcc-10 ##########"
-            CC=gcc-10 make strip
+            echo "########## gcc-9 ##########"
+            CC=gcc-9 make strip
             ls -l nnn
             make clean
             echo
-            echo "########## clang ##########"
-            CC=clang make strip
+            echo "########## gcc-10 ##########"
+            CC=gcc-10 make strip
             ls -l nnn
             make clean
             echo
@@ -67,6 +62,11 @@ jobs:
             ls -l nnn
             make clean
             echo
+            echo "########## clang-10 ##########"
+            CC=clang-10 make strip
+            ls -l nnn
+            make clean
+            echo
             echo "########## clang-tidy-10 ##########"
             clang-tidy-10 src/* -- -I/usr/include -I/usr/include/ncursesw
             echo "########## shellcheck ##########"