configure.ac - third_party/protobuf - Git at Google

 ## Process this file with autoconf to produce configure.
 ## In general, the safest way to proceed is to run ./autogen.sh

 AC_PREREQ(2.59)

 # Note:  If you change the version, you must also update it in:
 # * Protobuf.podspec
 # * csharp/Google.Protobuf.Tools.nuspec
 # * csharp/src/*/AssemblyInfo.cs
 # * csharp/src/Google.Protobuf/Google.Protobuf.nuspec
 # * java/*/pom.xml
 # * python/google/protobuf/__init__.py
 # * protoc-artifacts/pom.xml
 # * src/google/protobuf/stubs/common.h
 # * src/Makefile.am (Update -version-info for LDFLAGS if needed)
 #
 # In the SVN trunk, the version should always be the next anticipated release
 # version with the "-pre" suffix.  (We used to use "-SNAPSHOT" but this pushed
 # the size of one file name in the dist tarfile over the 99-char limit.)
 AC_INIT([Protocol Buffers],[3.9.2],[protobuf@googlegroups.com],[protobuf])

 AM_MAINTAINER_MODE([enable])

 AC_CONFIG_SRCDIR(src/google/protobuf/message.cc)
 # The config file is generated but not used by the source code, since we only
 # need very few of them, e.g. HAVE_PTHREAD and HAVE_ZLIB. Those macros are
 # passed down in CXXFLAGS manually in src/Makefile.am
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])

 AC_ARG_VAR(DIST_LANG, [language to include in the distribution package (i.e., make dist)])
 case "$DIST_LANG" in
   "") DIST_LANG=all ;;
   all | cpp | csharp | java | python | javanano | objectivec | ruby | js | php) ;;
   *) AC_MSG_FAILURE([unknown language: $DIST_LANG]) ;;
 esac
 AC_SUBST(DIST_LANG)

 # autoconf's default CXXFLAGS are usually "-g -O2".  These aren't necessarily
 # the best choice for libprotobuf.
 AS_IF([test "x${ac_cv_env_CFLAGS_set}" = "x"],
       [CFLAGS=""])
 AS_IF([test "x${ac_cv_env_CXXFLAGS_set}" = "x"],
       [CXXFLAGS=""])

 AC_CANONICAL_TARGET

 AM_INIT_AUTOMAKE([1.9 tar-ustar subdir-objects])

 # Silent rules enabled: the output is minimal but informative.
 # In particular, the warnings from the compiler stick out very clearly.
 # To see all logs, use the --disable-silent-rules on configure or via make V=1
 AM_SILENT_RULES([yes])

 AC_ARG_WITH([zlib],
   [AS_HELP_STRING([--with-zlib],
     [include classes for streaming compressed data in and out @<:@default=check@:>@])],
   [],[with_zlib=check])

 AC_ARG_WITH([zlib-include],
   [AS_HELP_STRING([--with-zlib-include=PATH],
     [zlib include directory])],
   [CPPFLAGS="-I$withval $CPPFLAGS"])

 AC_ARG_WITH([zlib-lib],
   [AS_HELP_STRING([--with-zlib-lib=PATH],
     [zlib lib directory])],
   [LDFLAGS="-L$withval $LDFLAGS"])

 AC_ARG_WITH([protoc],
   [AS_HELP_STRING([--with-protoc=COMMAND],
     [use the given protoc command instead of building a new one when building tests (useful for cross-compiling)])],
   [],[with_protoc=no])

 # Checks for programs.
 AC_PROG_CC
 AC_PROG_CXX
 AC_PROG_CXX_FOR_BUILD
 AC_LANG([C++])
 ACX_USE_SYSTEM_EXTENSIONS
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 AM_CONDITIONAL(GCC, test "$GCC" = yes)   # let the Makefile know if we're gcc
 AC_PROG_OBJC

 # test_util.cc takes forever to compile with GCC and optimization turned on.
 AC_MSG_CHECKING([C++ compiler flags...])
 AS_IF([test "x${ac_cv_env_CXXFLAGS_set}" = "x"],[
   AS_IF([test "$GCC" = "yes"],[
     PROTOBUF_OPT_FLAG="-O2"
     CXXFLAGS="${CXXFLAGS} -g"
   ])

   # Protocol Buffers contains several checks that are intended to be used only
   # for debugging and which might hurt performance.  Most users are probably
   # end users who don't want these checks, so add -DNDEBUG by default.
   CXXFLAGS="$CXXFLAGS -std=c++11 -DNDEBUG"

   AC_MSG_RESULT([use default: $PROTOBUF_OPT_FLAG $CXXFLAGS])
 ],[
   AC_MSG_RESULT([use user-supplied: $CXXFLAGS])
 ])

 AC_SUBST(PROTOBUF_OPT_FLAG)

 ACX_CHECK_SUNCC

 # Have to do libtool after SUNCC, other wise it "helpfully" adds Crun Cstd
 # to the link
 AC_PROG_LIBTOOL

 # Check whether the linker supports version scripts
 AC_MSG_CHECKING([whether the linker supports version scripts])
 save_LDFLAGS=$LDFLAGS
 LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
 cat > conftest.map <<EOF
 {
   global:
     main;
   local:
     *;
 };
 EOF
 AC_LINK_IFELSE(
   [AC_LANG_SOURCE([int main() { return 0; }])],
   [have_ld_version_script=yes; AC_MSG_RESULT(yes)],
   [have_ld_version_script=no; AC_MSG_RESULT(no)])
 LDFLAGS=$save_LDFLAGS
 AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT], [test "$have_ld_version_script" == "yes"])

 # Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([fcntl.h inttypes.h limits.h stdlib.h unistd.h])

 # Checks for library functions.
 AC_FUNC_MEMCMP
 AC_FUNC_STRTOD
 AC_CHECK_FUNCS([ftruncate memset mkdir strchr strerror strtol])

 # Check for zlib.
 HAVE_ZLIB=0
 AS_IF([test "$with_zlib" != no], [
   AC_MSG_CHECKING([zlib version])

   # First check the zlib header version.
   AC_COMPILE_IFELSE(
     [AC_LANG_PROGRAM([[
         #include <zlib.h>
         #if !defined(ZLIB_VERNUM) || (ZLIB_VERNUM < 0x1204)
         # error zlib version too old
         #endif
         ]], [])], [
     AC_MSG_RESULT([ok (1.2.0.4 or later)])

     # Also need to add -lz to the linker flags and make sure this succeeds.
     AC_SEARCH_LIBS([zlibVersion], [z], [
       AC_DEFINE([HAVE_ZLIB], [1], [Enable classes using zlib compression.])
       HAVE_ZLIB=1
     ], [
       AS_IF([test "$with_zlib" != check], [
         AC_MSG_FAILURE([--with-zlib was given, but no working zlib library was found])
       ])
     ])
   ], [
     AS_IF([test "$with_zlib" = check], [
       AC_MSG_RESULT([headers missing or too old (requires 1.2.0.4)])
     ], [
       AC_MSG_FAILURE([--with-zlib was given, but zlib headers were not present or were too old (requires 1.2.0.4)])
     ])
   ])
 ])
 AM_CONDITIONAL([HAVE_ZLIB], [test $HAVE_ZLIB = 1])

 # Add -std=c++11 if necesssary. It is important for us to do this before the
 # libatomic check below, since that also depends on C++11.
 AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory])

 dnl On some platforms, std::atomic needs a helper library
 AC_MSG_CHECKING(whether -latomic is needed)
 AC_LINK_IFELSE([AC_LANG_SOURCE([[
   #include <atomic>
   #include <cstdint>
   std::atomic<std::int64_t> v;
   int main() {
     return v;
   }
 ]])], STD_ATOMIC_NEED_LIBATOMIC=no, STD_ATOMIC_NEED_LIBATOMIC=yes)
 AC_MSG_RESULT($STD_ATOMIC_NEED_LIBATOMIC)
 if test "x$STD_ATOMIC_NEED_LIBATOMIC" = xyes; then
   LIBATOMIC_LIBS="-latomic"
 fi
 AC_SUBST([LIBATOMIC_LIBS])

 AS_IF([test "$with_protoc" != "no"], [
   PROTOC=$with_protoc
   AS_IF([test "$with_protoc" = "yes"], [
     # No argument given.  Use system protoc.
     PROTOC=protoc
   ])
   AS_IF([echo "$PROTOC" | grep -q '^@<:@^/@:>@.*/'], [
     # Does not start with a slash, but contains a slash.  So, it's a relative
     # path (as opposed to an absolute path or an executable in $PATH).
     # Since it will actually be executed from the src directory, prefix with
     # the current directory.  We also insert $ac_top_build_prefix in case this
     # is a nested package and --with-protoc was actually given on the outer
     # package's configure script.
     PROTOC=`pwd`/${ac_top_build_prefix}$PROTOC
   ])
   AC_SUBST([PROTOC])
 ])
 AM_CONDITIONAL([USE_EXTERNAL_PROTOC], [test "$with_protoc" != "no"])

 AX_PTHREAD
 AM_CONDITIONAL([HAVE_PTHREAD], [test "x$ax_pthread_ok" = "xyes"])
 # We still keep this for improving pbconfig.h for unsupported platforms.
 AC_CXX_STL_HASH

 # Enable ObjC support for conformance directory on OS X.
 OBJC_CONFORMANCE_TEST=0
 case "$target_os" in
   darwin*)
     OBJC_CONFORMANCE_TEST=1
     ;;
 esac
 AM_CONDITIONAL([OBJC_CONFORMANCE_TEST], [test $OBJC_CONFORMANCE_TEST = 1])

 # HACK:  Make gmock's configure script pick up our copy of CFLAGS and CXXFLAGS,
 #   since the flags added by ACX_CHECK_SUNCC must be used when compiling gmock
 #   too.
 export CFLAGS
 export CXXFLAGS
 AC_CONFIG_SUBDIRS([third_party/googletest])

 AC_CONFIG_FILES([Makefile src/Makefile benchmarks/Makefile conformance/Makefile protobuf.pc protobuf-lite.pc])
 AC_OUTPUT
	## Process this file with autoconf to produce configure.
	## In general, the safest way to proceed is to run ./autogen.sh

	AC_PREREQ(2.59)

	# Note: If you change the version, you must also update it in:
	# * Protobuf.podspec
	# * csharp/Google.Protobuf.Tools.nuspec
	# * csharp/src/*/AssemblyInfo.cs
	# * csharp/src/Google.Protobuf/Google.Protobuf.nuspec
	# * java/*/pom.xml
	# * python/google/protobuf/__init__.py
	# * protoc-artifacts/pom.xml
	# * src/google/protobuf/stubs/common.h
	# * src/Makefile.am (Update -version-info for LDFLAGS if needed)
	#
	# In the SVN trunk, the version should always be the next anticipated release
	# version with the "-pre" suffix. (We used to use "-SNAPSHOT" but this pushed
	# the size of one file name in the dist tarfile over the 99-char limit.)
	AC_INIT([Protocol Buffers],[3.9.2],[protobuf@googlegroups.com],[protobuf])

	AM_MAINTAINER_MODE([enable])

	AC_CONFIG_SRCDIR(src/google/protobuf/message.cc)
	# The config file is generated but not used by the source code, since we only
	# need very few of them, e.g. HAVE_PTHREAD and HAVE_ZLIB. Those macros are
	# passed down in CXXFLAGS manually in src/Makefile.am
	AC_CONFIG_HEADERS([config.h])
	AC_CONFIG_MACRO_DIR([m4])

	AC_ARG_VAR(DIST_LANG, [language to include in the distribution package (i.e., make dist)])
	case "$DIST_LANG" in
	"") DIST_LANG=all ;;
	all \| cpp \| csharp \| java \| python \| javanano \| objectivec \| ruby \| js \| php) ;;
	*) AC_MSG_FAILURE([unknown language: $DIST_LANG]) ;;
	esac
	AC_SUBST(DIST_LANG)

	# autoconf's default CXXFLAGS are usually "-g -O2". These aren't necessarily
	# the best choice for libprotobuf.
	AS_IF([test "x${ac_cv_env_CFLAGS_set}" = "x"],
	[CFLAGS=""])
	AS_IF([test "x${ac_cv_env_CXXFLAGS_set}" = "x"],
	[CXXFLAGS=""])

	AC_CANONICAL_TARGET

	AM_INIT_AUTOMAKE([1.9 tar-ustar subdir-objects])

	# Silent rules enabled: the output is minimal but informative.
	# In particular, the warnings from the compiler stick out very clearly.
	# To see all logs, use the --disable-silent-rules on configure or via make V=1
	AM_SILENT_RULES([yes])

	AC_ARG_WITH([zlib],
	[AS_HELP_STRING([--with-zlib],
	[include classes for streaming compressed data in and out @<:@default=check@:>@])],
	[],[with_zlib=check])

	AC_ARG_WITH([zlib-include],
	[AS_HELP_STRING([--with-zlib-include=PATH],
	[zlib include directory])],
	[CPPFLAGS="-I$withval $CPPFLAGS"])

	AC_ARG_WITH([zlib-lib],
	[AS_HELP_STRING([--with-zlib-lib=PATH],
	[zlib lib directory])],
	[LDFLAGS="-L$withval $LDFLAGS"])

	AC_ARG_WITH([protoc],
	[AS_HELP_STRING([--with-protoc=COMMAND],
	[use the given protoc command instead of building a new one when building tests (useful for cross-compiling)])],
	[],[with_protoc=no])

	# Checks for programs.
	AC_PROG_CC
	AC_PROG_CXX
	AC_PROG_CXX_FOR_BUILD
	AC_LANG([C++])
	ACX_USE_SYSTEM_EXTENSIONS
	m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
	AM_CONDITIONAL(GCC, test "$GCC" = yes) # let the Makefile know if we're gcc
	AC_PROG_OBJC

	# test_util.cc takes forever to compile with GCC and optimization turned on.
	AC_MSG_CHECKING([C++ compiler flags...])
	AS_IF([test "x${ac_cv_env_CXXFLAGS_set}" = "x"],[
	AS_IF([test "$GCC" = "yes"],[
	PROTOBUF_OPT_FLAG="-O2"
	CXXFLAGS="${CXXFLAGS} -g"
	])

	# Protocol Buffers contains several checks that are intended to be used only
	# for debugging and which might hurt performance. Most users are probably
	# end users who don't want these checks, so add -DNDEBUG by default.
	CXXFLAGS="$CXXFLAGS -std=c++11 -DNDEBUG"

	AC_MSG_RESULT([use default: $PROTOBUF_OPT_FLAG $CXXFLAGS])
	],[
	AC_MSG_RESULT([use user-supplied: $CXXFLAGS])
	])

	AC_SUBST(PROTOBUF_OPT_FLAG)

	ACX_CHECK_SUNCC

	# Have to do libtool after SUNCC, other wise it "helpfully" adds Crun Cstd
	# to the link
	AC_PROG_LIBTOOL

	# Check whether the linker supports version scripts
	AC_MSG_CHECKING([whether the linker supports version scripts])
	save_LDFLAGS=$LDFLAGS
	LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
	cat > conftest.map <<EOF
	{
	global:
	main;
	local:
	*;
	};
	EOF
	AC_LINK_IFELSE(
	[AC_LANG_SOURCE([int main() { return 0; }])],
	[have_ld_version_script=yes; AC_MSG_RESULT(yes)],
	[have_ld_version_script=no; AC_MSG_RESULT(no)])
	LDFLAGS=$save_LDFLAGS
	AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT], [test "$have_ld_version_script" == "yes"])

	# Checks for header files.
	AC_HEADER_STDC
	AC_CHECK_HEADERS([fcntl.h inttypes.h limits.h stdlib.h unistd.h])

	# Checks for library functions.
	AC_FUNC_MEMCMP
	AC_FUNC_STRTOD
	AC_CHECK_FUNCS([ftruncate memset mkdir strchr strerror strtol])

	# Check for zlib.
	HAVE_ZLIB=0
	AS_IF([test "$with_zlib" != no], [
	AC_MSG_CHECKING([zlib version])

	# First check the zlib header version.
	AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM([[
	#include <zlib.h>
	#if !defined(ZLIB_VERNUM) \|\| (ZLIB_VERNUM < 0x1204)
	# error zlib version too old
	#endif
	]], [])], [
	AC_MSG_RESULT([ok (1.2.0.4 or later)])

	# Also need to add -lz to the linker flags and make sure this succeeds.
	AC_SEARCH_LIBS([zlibVersion], [z], [
	AC_DEFINE([HAVE_ZLIB], [1], [Enable classes using zlib compression.])
	HAVE_ZLIB=1
	], [
	AS_IF([test "$with_zlib" != check], [
	AC_MSG_FAILURE([--with-zlib was given, but no working zlib library was found])
	])
	])
	], [
	AS_IF([test "$with_zlib" = check], [
	AC_MSG_RESULT([headers missing or too old (requires 1.2.0.4)])
	], [
	AC_MSG_FAILURE([--with-zlib was given, but zlib headers were not present or were too old (requires 1.2.0.4)])
	])
	])
	])
	AM_CONDITIONAL([HAVE_ZLIB], [test $HAVE_ZLIB = 1])

	# Add -std=c++11 if necesssary. It is important for us to do this before the
	# libatomic check below, since that also depends on C++11.
	AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory])

	dnl On some platforms, std::atomic needs a helper library
	AC_MSG_CHECKING(whether -latomic is needed)
	AC_LINK_IFELSE([AC_LANG_SOURCE([[
	#include <atomic>
	#include <cstdint>
	std::atomic<std::int64_t> v;
	int main() {
	return v;
	}
	]])], STD_ATOMIC_NEED_LIBATOMIC=no, STD_ATOMIC_NEED_LIBATOMIC=yes)
	AC_MSG_RESULT($STD_ATOMIC_NEED_LIBATOMIC)
	if test "x$STD_ATOMIC_NEED_LIBATOMIC" = xyes; then
	LIBATOMIC_LIBS="-latomic"
	fi
	AC_SUBST([LIBATOMIC_LIBS])

	AS_IF([test "$with_protoc" != "no"], [
	PROTOC=$with_protoc
	AS_IF([test "$with_protoc" = "yes"], [
	# No argument given. Use system protoc.
	PROTOC=protoc
	])
	AS_IF([echo "$PROTOC" \| grep -q '^@<:@^/@:>@.*/'], [
	# Does not start with a slash, but contains a slash. So, it's a relative
	# path (as opposed to an absolute path or an executable in $PATH).
	# Since it will actually be executed from the src directory, prefix with
	# the current directory. We also insert $ac_top_build_prefix in case this
	# is a nested package and --with-protoc was actually given on the outer
	# package's configure script.
	PROTOC=`pwd`/${ac_top_build_prefix}$PROTOC
	])
	AC_SUBST([PROTOC])
	])
	AM_CONDITIONAL([USE_EXTERNAL_PROTOC], [test "$with_protoc" != "no"])

	AX_PTHREAD
	AM_CONDITIONAL([HAVE_PTHREAD], [test "x$ax_pthread_ok" = "xyes"])
	# We still keep this for improving pbconfig.h for unsupported platforms.
	AC_CXX_STL_HASH

	# Enable ObjC support for conformance directory on OS X.
	OBJC_CONFORMANCE_TEST=0
	case "$target_os" in
	darwin*)
	OBJC_CONFORMANCE_TEST=1
	;;
	esac
	AM_CONDITIONAL([OBJC_CONFORMANCE_TEST], [test $OBJC_CONFORMANCE_TEST = 1])

	# HACK: Make gmock's configure script pick up our copy of CFLAGS and CXXFLAGS,
	# since the flags added by ACX_CHECK_SUNCC must be used when compiling gmock
	# too.
	export CFLAGS
	export CXXFLAGS
	AC_CONFIG_SUBDIRS([third_party/googletest])

	AC_CONFIG_FILES([Makefile src/Makefile benchmarks/Makefile conformance/Makefile protobuf.pc protobuf-lite.pc])
	AC_OUTPUT