add a fuzzer build

.travis.yml

@@ -19,6 +19,18 @@ matrix:
       # Documentation
     - env: BUILD=Doc
       sudo: required
+      # make sure the fuzzers still build ok
+    - env: COMPILER=clang++-6.0 BUILD=Debug STANDARD=14 ENABLE_FUZZING=1
+      compiler: clang
+      addons:
+        apt:
+          update: true
+          packages:
+            - clang-6.0
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-trusty
+            - llvm-toolchain-trusty-6.0
       # g++ 6 on Linux with C++14
     - env: COMPILER=g++-6 BUILD=Debug STANDARD=14
       compiler: gcc

support/travis-build.py

@@ -83,27 +83,32 @@ def install_dependencies():
 build_dir      = os.path.join(fmt_dir, "_build")
 test_build_dir = os.path.join(fmt_dir, "_build_test")
 
-# Configure library.
+# Configure the library.
 makedirs_if_not_exist(build_dir)
 cmake_flags = [
     '-DCMAKE_INSTALL_PREFIX=' + install_dir, '-DCMAKE_BUILD_TYPE=' + build,
     '-DCMAKE_CXX_STANDARD=' + standard
 ]
+
+# make sure the fuzzers still compile
+if 'ENABLE_FUZZING' in os.environ:
+    cmake_flags += ['-DFMT_FUZZ=ON', '-DFMT_FUZZ_LINKMAIN=On']
+
 check_call(['cmake', '-DFMT_DOC=OFF', '-DFMT_PEDANTIC=ON', '-DFMT_WERROR=ON', fmt_dir] +
            cmake_flags, cwd=build_dir)
 
-# Build library.
-check_call(['make', '-j4'], cwd=build_dir)
+# Build the library.
+check_call(['cmake', '--build','.'], cwd=build_dir)
 
-# Test library.
+# Test the library.
 env = os.environ.copy()
 env['CTEST_OUTPUT_ON_FAILURE'] = '1'
 if call(['make', 'test'], env=env, cwd=build_dir):
     with open(os.path.join(build_dir, 'Testing', 'Temporary', 'LastTest.log'), 'r') as f:
         print(f.read())
     sys.exit(-1)
 
-# Install library.
+# Install the library.
 check_call(['make', 'install'], cwd=build_dir)
 
 # Test installation.