Add macOS support to travis

.travis.yml

@@ -1,5 +1,10 @@
 language: c
-os: linux
+os:
+  - linux
+  - osx
+
+# Valgrind currently supports upto macOS 10.13, the latest xcode of that version is 10.1
+osx_image: xcode10.1
 addons:
   apt:
     packages:
@@ -30,10 +35,13 @@ env:
     - CFLAGS=-O0 CTIMETEST=
     - ECMULTGENPRECISION=2
     - ECMULTGENPRECISION=8
+    - VALGRIND=yes ENDOMORPHISM=yes BIGNUM=no ASM=x86_64 EXPERIMENTAL=yes ECDH=yes  RECOVERY=yes EXTRAFLAGS="--disable-openssl-tests" CPPFLAGS=-DVALGRIND BUILD=
+    - VALGRIND=yes                  BIGNUM=no ASM=x86_64 EXPERIMENTAL=yes ECDH=yes  RECOVERY=yes EXTRAFLAGS="--disable-openssl-tests" CPPFLAGS=-DVALGRIND BUILD=
 matrix:
   fast_finish: true
   include:
     - compiler: clang
+      os: linux
       env: HOST=i686-linux-gnu ENDOMORPHISM=yes
       addons:
         apt:
@@ -45,6 +53,7 @@ matrix:
             - libc6-dbg:i386
     - compiler: clang
       env: HOST=i686-linux-gnu
+      os: linux
       addons:
         apt:
           packages:
@@ -54,6 +63,7 @@ matrix:
             - libc6-dbg:i386
     - compiler: gcc
       env: HOST=i686-linux-gnu ENDOMORPHISM=yes
+      os: linux
       addons:
         apt:
           packages:
@@ -62,6 +72,7 @@ matrix:
             - libtool-bin
             - libc6-dbg:i386
     - compiler: gcc
+      os: linux
       env: HOST=i686-linux-gnu
       addons:
         apt:
@@ -71,14 +82,12 @@ matrix:
             - valgrind
             - libtool-bin
             - libc6-dbg:i386
-    - compiler: gcc
-      env:
-        - BIGNUM=no  ENDOMORPHISM=yes  ASM=x86_64 EXPERIMENTAL=yes ECDH=yes  RECOVERY=yes
-        - VALGRIND=yes EXTRAFLAGS="--disable-openssl-tests" CPPFLAGS=-DVALGRIND BUILD=
-    - compiler: gcc
-      env: # The same as above but without endomorphism.
-        - BIGNUM=no  ASM=x86_64 EXPERIMENTAL=yes ECDH=yes  RECOVERY=yes
-        - VALGRIND=yes EXTRAFLAGS="--disable-openssl-tests" CPPFLAGS=-DVALGRIND BUILD=
+
+# We use this to install macOS dependencies instead of the built in `homebrew` plugin,
+# because in xcode earlier than 11 they have a bug requiring updating the system which overall takes ~8 minutes.
+# https://travis-ci.community/t/macos-build-fails-because-of-homebrew-bundle-unknown-command/7296
+before_install:
+ - if [ "${TRAVIS_OS_NAME}" = "osx" ]; then HOMEBREW_NO_AUTO_UPDATE=1 brew install gmp valgrind gcc@9; fi
 
 before_script: ./autogen.sh
 
@@ -90,3 +99,5 @@ after_script:
     - cat ./exhaustive_tests.log
     - cat ./valgrind_ctime_test.log
     - cat ./bench.log
+    - $CC --version
+    - valgrind --version

contrib/travis.sh

@@ -11,6 +11,10 @@ if [ "$HOST" = "i686-linux-gnu" ]
 then
     export CC="$CC -m32"
 fi
+if [ "$TRAVIS_OS_NAME" = "osx" ] && [ "$TRAVIS_COMPILER" = "gcc" ]
+then
+    export CC="gcc-9"
+fi
 
 ./configure \
     --enable-experimental="$EXPERIMENTAL" --enable-endomorphism="$ENDOMORPHISM" \
@@ -33,7 +37,8 @@ if [ -n "$BENCH" ]
 then
     if [ -n "$VALGRIND" ]
     then
-        EXEC='libtool --mode=execute valgrind --error-exitcode=42'
+        # Using the local `libtool` because on macOS the system's libtool has nothing to do with GNU libtool
+        EXEC='./libtool --mode=execute valgrind --error-exitcode=42'
     else
         EXEC=
     fi
@@ -54,5 +59,5 @@ then
 fi
 if [ -n "$CTIMETEST" ]
 then
-    libtool --mode=execute valgrind --error-exitcode=42 ./valgrind_ctime_test > valgrind_ctime_test.log 2>&1
+    ./libtool --mode=execute valgrind --error-exitcode=42 ./valgrind_ctime_test > valgrind_ctime_test.log 2>&1
 fi