Simplify build config and enable C++11 by default

support/cmake/testCxx11.cmake

@@ -1,37 +1,37 @@
 include(CheckCXXCompilerFlag)
 
-check_cxx_compiler_flag(-std=c++11 HAVE_STD_CPP11_FLAG)
-if (HAVE_STD_CPP11_FLAG)
-  # Check if including cmath works with -std=c++11 and -O3.
-  # It may not in MinGW due to bug http://ehc.ac/p/mingw/bugs/2250/.
-  set(CMAKE_REQUIRED_FLAGS "-std=c++11 -O3")
-  check_cxx_source_compiles("
-    #include <cmath>
-    int main() {}" FMT_CPP11_CMATH)
-  # Check if including <unistd.h> works with -std=c++11.
-  # It may not in MinGW due to bug http://sourceforge.net/p/mingw/bugs/2024/.
-  check_cxx_source_compiles("
-    #include <unistd.h>
-    int main() {}" FMT_CPP11_UNISTD_H)
-  if (FMT_CPP11_CMATH AND FMT_CPP11_UNISTD_H)
-    set(CPP11_FLAG -std=c++11)
-  else ()
-    check_cxx_compiler_flag(-std=gnu++11 HAVE_STD_GNUPP11_FLAG)
-    if (HAVE_STD_CPP11_FLAG)
-      set(CPP11_FLAG -std=gnu++11)
+if (FMT_USE_CPP11)
+  check_cxx_compiler_flag(-std=c++11 HAVE_STD_CPP11_FLAG)
+  if (HAVE_STD_CPP11_FLAG)
+    # Check if including cmath works with -std=c++11 and -O3.
+    # It may not in MinGW due to bug http://ehc.ac/p/mingw/bugs/2250/.
+    set(CMAKE_REQUIRED_FLAGS "-std=c++11 -O3")
+    check_cxx_source_compiles("
+      #include <cmath>
+      int main() {}" FMT_CPP11_CMATH)
+    # Check if including <unistd.h> works with -std=c++11.
+    # It may not in MinGW due to bug http://sourceforge.net/p/mingw/bugs/2024/.
+    check_cxx_source_compiles("
+      #include <unistd.h>
+      int main() {}" FMT_CPP11_UNISTD_H)
+    if (FMT_CPP11_CMATH AND FMT_CPP11_UNISTD_H)
+      set(CPP11_FLAG -std=c++11)
+    else ()
+      check_cxx_compiler_flag(-std=gnu++11 HAVE_STD_GNUPP11_FLAG)
+      if (HAVE_STD_CPP11_FLAG)
+        set(CPP11_FLAG -std=gnu++11)
+      endif ()
+    endif ()
+    set(CMAKE_REQUIRED_FLAGS )
+  else ()
+    check_cxx_compiler_flag(-std=c++0x HAVE_STD_CPP0X_FLAG)
+    if (HAVE_STD_CPP0X_FLAG)
+      set(CPP11_FLAG -std=c++0x)
     endif ()
-  endif ()
-  set(CMAKE_REQUIRED_FLAGS )
-else ()
-  check_cxx_compiler_flag(-std=c++0x HAVE_STD_CPP0X_FLAG)
-  if (HAVE_STD_CPP0X_FLAG)
-    set(CPP11_FLAG -std=c++0x)
   endif ()
 endif ()
 
-if (FMT_USE_CPP11)
-  set(CMAKE_REQUIRED_FLAGS ${CPP11_FLAG})
-endif ()
+set(CMAKE_REQUIRED_FLAGS ${CPP11_FLAG})
 
 # Check if variadic templates are working and not affected by GCC bug 39653:
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39653

support/travis-build.py

@@ -19,6 +19,8 @@ def makedirs_if_not_exist(dir):
     if e.errno != errno.EEXIST:
       raise
 
+cppformat_dir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+
 build = os.environ['BUILD']
 if build == 'Doc':
   travis = 'TRAVIS' in os.environ
@@ -39,7 +41,6 @@ if build == 'Doc':
     urllib.urlretrieve('http://mirrors.kernel.org/ubuntu/pool/main/d/doxygen/' +
                        deb_file, deb_file)
     check_call(['sudo', 'dpkg', '-i', deb_file])
-  cppformat_dir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
   sys.path.insert(0, os.path.join(cppformat_dir, 'doc'))
   import build
   html_dir = build.build_docs()
@@ -74,52 +75,39 @@ if build == 'Doc':
       raise CalledProcessError(p.returncode, cmd)
   exit(0)
 
-cppStandard = os.environ['STANDARD']
-srcDir = os.getcwd()
-srcDir_test = os.path.join(srcDir,"test","find-package-test")
+standard = os.environ['STANDARD']
+install_dir    = os.path.join(cppformat_dir, "_install")
+build_dir      = os.path.join(cppformat_dir, "_build")
+test_build_dir = os.path.join(cppformat_dir, "_build_test")
 
-installDir    = os.path.join(srcDir,"_install")
-buildDir      = os.path.join(srcDir,"_build")
-buildDir_test = os.path.join(srcDir,"_build_test")
+# Configure library.
+makedirs_if_not_exist(build_dir)
+common_cmake_flags = [
+  '-DCMAKE_INSTALL_PREFIX=' + install_dir, '-DCMAKE_BUILD_TYPE=' + build
+]
+extra_cmake_flags = []
+if standard != '0x':
+  extra_cmake_flags = ['-DCMAKE_CXX_FLAGS=-std=c++' + standard, '-DFMT_USE_CPP11=OFF']
+check_call(['cmake', '-DFMT_DOC=OFF', '-DFMT_PEDANTIC=ON', cppformat_dir] +
+           common_cmake_flags + extra_cmake_flags, cwd=build_dir)
 
-# configure library
-makedirs_if_not_exist(buildDir)
-os.chdir(buildDir)
-if cppStandard == '0x':
-  # default configuration
-  check_call(['cmake', '-DCMAKE_INSTALL_PREFIX='+installDir,
-                       '-DCMAKE_BUILD_TYPE=' + build,
-                       '-DFMT_DOC=OFF',
-                       '-DFMT_PEDANTIC=ON',
-                       srcDir])
-else:
-  check_call(['cmake', '-DCMAKE_INSTALL_PREFIX='+installDir,
-                       '-DCMAKE_BUILD_TYPE=' + build,
-                       '-DCMAKE_CXX_FLAGS=-std=c++' + cppStandard,
-                       '-DFMT_USE_CPP11=OFF',
-                       '-DFMT_DOC=OFF',
-                       '-DFMT_PEDANTIC=ON',
-                       srcDir])
+# Build library.
+check_call(['make', '-j4'], cwd=build_dir)
 
-# build library
-check_call(['make', '-j4'])
-
-# test library
+# Test library.
 env = os.environ.copy()
 env['CTEST_OUTPUT_ON_FAILURE'] = '1'
-if call(['make', 'test'], env=env):
+if call(['make', 'test'], env=env, cwd=build_dir):
   with open('Testing/Temporary/LastTest.log', 'r') as f:
     print(f.read())
   sys.exit(-1)
 
-# install library
-check_call(['make', 'install'])
+# Install library.
+check_call(['make', 'install'], cwd=build_dir)
 
-# test installation
-makedirs_if_not_exist(buildDir_test)
-os.chdir(buildDir_test)
-check_call(['cmake', '-DCMAKE_INSTALL_PREFIX='+installDir,
-                      '-DCMAKE_BUILD_TYPE=' + build,
-                      '-DCMAKE_CXX_FLAGS=-std=c++' + cppStandard,
-                      srcDir_test])
-check_call(['make', '-j4'])
+# Test installation.
+makedirs_if_not_exist(test_build_dir)
+check_call(['cmake', '-DCMAKE_CXX_FLAGS=-std=c++' + standard,
+                     os.path.join(cppformat_dir, "test", "find-package-test")] +
+           common_cmake_flags, cwd=test_build_dir)
+check_call(['make', '-j4'], cwd=test_build_dir)