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Diffstat (limited to 'src/engine/SCons/Conftest.py')
| -rw-r--r-- | src/engine/SCons/Conftest.py | 483 |
1 files changed, 483 insertions, 0 deletions
diff --git a/src/engine/SCons/Conftest.py b/src/engine/SCons/Conftest.py new file mode 100644 index 0000000..a6bedf5 --- /dev/null +++ b/src/engine/SCons/Conftest.py @@ -0,0 +1,483 @@ +"""SCons.Conftest + +Autoconf-like configuration support; low level implementation of tests. +""" + +# +# Copyright (c) 2003 Stichting NLnet Labs +# Copyright (c) 2001, 2002, 2003 Steven Knight +# +# Permission is hereby granted, free of charge, to any person obtaining +# a copy of this software and associated documentation files (the +# "Software"), to deal in the Software without restriction, including +# without limitation the rights to use, copy, modify, merge, publish, +# distribute, sublicense, and/or sell copies of the Software, and to +# permit persons to whom the Software is furnished to do so, subject to +# the following conditions: +# +# The above copyright notice and this permission notice shall be included +# in all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY +# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE +# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +# + +# +# The purpose of this module is to define how a check is to be performed. +# Use one of the Check...() functions below. +# + +# +# A context class is used that defines functions for carrying out the tests, +# logging and messages. The following methods and members must be present: +# +# context.Display(msg) Function called to print messages that are normally +# displayed for the user. Newlines are explicitly used. +# The text should also be written to the logfile! +# +# context.Log(msg) Function called to write to a log file. +# +# context.BuildProg(text, ext) +# Function called to build a program, using "ext" for the +# file extention. Must return an empty string for +# success, an error message for failure. +# For reliable test results building should be done just +# like an actual program would be build, using the same +# command and arguments (including configure results so +# far). +# +# context.CompileProg(text, ext) +# Function called to compile a program, using "ext" for +# the file extention. Must return an empty string for +# success, an error message for failure. +# For reliable test results compiling should be done just +# like an actual source file would be compiled, using the +# same command and arguments (including configure results +# so far). +# +# context.AppendLIBS(lib_name_list) +# Append "lib_name_list" to the value of LIBS. +# "lib_namelist" is a list of strings. +# Return the value of LIBS before changing it (any type +# can be used, it is passed to SetLIBS() later. +# +# context.SetLIBS(value) +# Set LIBS to "value". The type of "value" is what +# AppendLIBS() returned. +# Return the value of LIBS before changing it (any type +# can be used, it is passed to SetLIBS() later. +# +# context.headerfilename +# Name of file to append configure results to, usually +# "confdefs.h". +# The file must not exist or be empty when starting. +# Empty or None to skip this (some tests will not work!). +# +# context.vardict Dictionary holding variables used for the tests and +# stores results from the tests, used for the build +# commands. +# Normally contains "CC", "LIBS", "CPPFLAGS", etc. +# +# context.havedict Dictionary holding results from the tests that are to +# be used inside a program. +# Names often start with "HAVE_". These are zero +# (feature not present) or one (feature present). Other +# variables may have any value, e.g., "PERLVERSION" can +# be a number and "SYSTEMNAME" a string. +# + +import string +from types import IntType + +# +# PUBLIC FUNCTIONS +# + +# Generic remarks: +# - When a language is specified which is not supported the test fails. The +# message is a bit different, because not all the arguments for the normal +# message are available yet (chicken-egg problem). + + +def CheckBuilder(context, text = None, language = None): + """ + Configure check to see if the compiler works. + Note that this uses the current value of compiler and linker flags, make + sure $CFLAGS, $CPPFLAGS and $LIBS are set correctly. + "language" should be "C" or "C++" and is used to select the compiler. + Default is "C". + "text" may be used to specify the code to be build. + Returns an empty string for success, an error message for failure. + """ + lang, suffix, msg = _lang2suffix(language) + if msg: + context.Display("%s\n" % msg) + return msg + + if not text: + text = """ + int main() { + return 0; + }\n\n""" + + context.Display("Checking if building a %s file works... " % lang) + ret = context.BuildProg(text, suffix) + _YesNoResult(context, ret, None, text) + return ret + + +def CheckFunc(context, function_name, header = None, language = None): + """ + Configure check for a function "function_name". + "language" should be "C" or "C++" and is used to select the compiler. + Default is "C". + Optional "header" can be defined to define a function prototype, include a + header file or anything else that comes before main(). + Sets HAVE_function_name in context.havedict according to the result. + Note that this uses the current value of compiler and linker flags, make + sure $CFLAGS, $CPPFLAGS and $LIBS are set correctly. + Returns an empty string for success, an error message for failure. + """ + + # Remarks from autoconf: + # - Don't include <ctype.h> because on OSF/1 3.0 it includes <sys/types.h> + # which includes <sys/select.h> which contains a prototype for select. + # Similarly for bzero. + # - assert.h is included to define __stub macros and hopefully few + # prototypes, which can conflict with char $1(); below. + # - Override any gcc2 internal prototype to avoid an error. + # - We use char for the function declaration because int might match the + # return type of a gcc2 builtin and then its argument prototype would + # still apply. + # - The GNU C library defines this for functions which it implements to + # always fail with ENOSYS. Some functions are actually named something + # starting with __ and the normal name is an alias. + + if context.headerfilename: + includetext = '#include "%s"' % context.headerfilename + else: + includetext = '' + if not header: + header = """ + #ifdef __cplusplus + extern "C" + #endif + char %s();""" % function_name + + lang, suffix, msg = _lang2suffix(language) + if msg: + context.Display("Cannot check for %s(): %s\n" % (function_name, msg)) + return msg + + text = """ + %(include)s + #include <assert.h> + %(hdr)s + + int main() { + #if defined (__stub_%(name)s) || defined (__stub___%(name)s) + fail fail fail + #else + %(name)s(); + #endif + + return 0; + }\n\n""" % { 'name': function_name, + 'include': includetext, + 'hdr': header } + + context.Display("Checking for %s function %s()... " % (lang, function_name)) + ret = context.BuildProg(text, suffix) + _YesNoResult(context, ret, "HAVE_" + function_name, text) + return ret + + +def CheckHeader(context, header_name, header = None, language = None, + include_quotes = None): + """ + Configure check for a C or C++ header file "header_name". + Optional "header" can be defined to do something before including the + header file (unusual, supported for consistency). + "language" should be "C" or "C++" and is used to select the compiler. + Default is "C". + Sets HAVE_header_name in context.havedict according to the result. + Note that this uses the current value of compiler and linker flags, make + sure $CFLAGS and $CPPFLAGS are set correctly. + Returns an empty string for success, an error message for failure. + """ + # Why compile the program instead of just running the preprocessor? + # It is possible that the header file exists, but actually using it may + # fail (e.g., because it depends on other header files). Thus this test is + # more strict. It may require using the "header" argument. + # + # Use <> by default, because the check is normally used for system header + # files. SCons passes '""' to overrule this. + + # Include "confdefs.h" first, so that the header can use HAVE_HEADER_H. + if context.headerfilename: + includetext = '#include "%s"\n' % context.headerfilename + else: + includetext = '' + if not header: + header = "" + + lang, suffix, msg = _lang2suffix(language) + if msg: + context.Display("Cannot check for header file %s: %s\n" + % (header_name, msg)) + return msg + + if not include_quotes: + include_quotes = "<>" + + text = "%s%s\n#include %s%s%s\n\n" % (includetext, header, + include_quotes[0], header_name, include_quotes[1]) + + context.Display("Checking for %s header file %s... " % (lang, header_name)) + ret = context.CompileProg(text, suffix) + _YesNoResult(context, ret, "HAVE_" + header_name, text) + return ret + + +def CheckType(context, type_name, fallback = None, + header = None, language = None): + """ + Configure check for a C or C++ type "type_name". + Optional "header" can be defined to include a header file. + "language" should be "C" or "C++" and is used to select the compiler. + Default is "C". + Sets HAVE_type_name in context.havedict according to the result. + Note that this uses the current value of compiler and linker flags, make + sure $CFLAGS, $CPPFLAGS and $LIBS are set correctly. + Returns an empty string for success, an error message for failure. + """ + + # Include "confdefs.h" first, so that the header can use HAVE_HEADER_H. + if context.headerfilename: + includetext = '#include "%s"' % context.headerfilename + else: + includetext = '' + if not header: + header = "" + + lang, suffix, msg = _lang2suffix(language) + if msg: + context.Display("Cannot check for %s type: %s\n" % (type_name, msg)) + return msg + + # Remarks from autoconf about this test: + # - Grepping for the type in include files is not reliable (grep isn't + # portable anyway). + # - Using "TYPE my_var;" doesn't work for const qualified types in C++. + # Adding an initializer is not valid for some C++ classes. + # - Using the type as parameter to a function either fails for K&$ C or for + # C++. + # - Using "TYPE *my_var;" is valid in C for some types that are not + # declared (struct something). + # - Using "sizeof(TYPE)" is valid when TYPE is actually a variable. + # - Using the previous two together works reliably. + text = """ + %(include)s + %(header)s + + int main() { + if ((%(name)s *) 0) + return 0; + if (sizeof (%(name)s)) + return 0; + }\n\n""" % { 'include': includetext, + 'header': header, + 'name': type_name } + + context.Display("Checking for %s type %s... " % (lang, type_name)) + ret = context.BuildProg(text, suffix) + _YesNoResult(context, ret, "HAVE_" + type_name, text) + if ret and fallback and context.headerfilename: + f = open(context.headerfilename, "a") + f.write("typedef %s %s;\n" % (fallback, type_name)) + f.close() + + return ret + + +def CheckLib(context, lib_name, func_name, header = None, + extra_libs = None, call = None, language = None, autoadd = 1): + """ + Configure check for a C or C++ library "lib_name". + Tests if "func_name" or "call" exists in the library. Note: if it exists + in another library the test succeeds anyway! + Optional "header" can be defined to include a header file. If not given a + default prototype for "func_name" is added. + Optional "extra_libs" is a list of library names to be added after + "lib_name" in the build command. To be used for libraries that "lib_name" + depends on. + Optional "call" replaces the call to "func_name" in the test code. It must + consist of complete C statements, including a trailing ";". + There must either be a "func_name" or a "call" argument (or both). + "language" should be "C" or "C++" and is used to select the compiler. + Default is "C". + Note that this uses the current value of compiler and linker flags, make + sure $CFLAGS, $CPPFLAGS and $LIBS are set correctly. + Returns an empty string for success, an error message for failure. + """ + # Include "confdefs.h" first, so that the header can use HAVE_HEADER_H. + if context.headerfilename: + includetext = '#include "%s"' % context.headerfilename + else: + includetext = '' + if not header: + header = "" + + lang, suffix, msg = _lang2suffix(language) + if msg: + context.Display("Cannot check for library %s: %s\n" % (lib_name, msg)) + return msg + + text = """ + %s + %s """ % (includetext, header) + + # Add a function declaration if needed. + if func_name and func_name != "main" and not header: + text = text + """ + #ifdef __cplusplus + extern "C" + #endif + char %s();""" % func_name + + # The actual test code. + if not call: + call = "%s();" % func_name + text = text + """ + int + main() { + %s + return 0; + } + \n\n""" % call + + i = string.find(call, "\n") + if i > 0: + calltext = call[:i] + ".." + elif call[-1] == ';': + calltext = call[:-1] + else: + calltext = call + + context.Display("Checking for %s in %s library %s... " + % (calltext, lang, lib_name)) + if lib_name: + l = [ lib_name ] + if extra_libs: + l.extend(extra_libs) + oldLIBS = context.AppendLIBS(l) + sym = "HAVE_LIB" + lib_name + else: + oldLIBS = -1 + sym = None + + ret = context.BuildProg(text, suffix) + + _YesNoResult(context, ret, sym, text) + if oldLIBS != -1 and (ret or not autoadd): + context.SetLIBS(oldLIBS) + + return ret + + +# +# END OF PUBLIC FUNCTIONS +# + +def _YesNoResult(context, ret, key, text): + """ + Handle the result of a test with a "yes" or "no" result. + "ret" is the return value: empty if OK, error message when not. + "key" is the name of the symbol to be defined (HAVE_foo). + "text" is the source code of the program used for testing. + """ + if key: + _Have(context, key, not ret) + if ret: + context.Display("no\n") + _LogFailed(context, text, ret) + else: + context.Display("yes\n") + + +def _Have(context, key, have): + """ + Store result of a test in context.havedict and context.headerfilename. + "key" is a "HAVE_abc" name. It is turned into all CAPITALS and ":./" are + replaced by an underscore. + The value of "have" can be: + 1 - Feature is defined, add "#define key". + 0 - Feature is not defined, add "/* #undef key */". + Adding "undef" is what autoconf does. Not useful for the + compiler, but it shows that the test was done. + number - Feature is defined to this number "#define key have". + Doesn't work for 0 or 1, use a string then. + string - Feature is defined to this string "#define key have". + Give "have" as is should appear in the header file, include quotes + when desired and escape special characters! + """ + key_up = string.upper(key) + key_up = string.replace(key_up, ':', '_') + key_up = string.replace(key_up, '.', '_') + key_up = string.replace(key_up, '/', '_') + key_up = string.replace(key_up, ' ', '_') + context.havedict[key_up] = have + if context.headerfilename: + f = open(context.headerfilename, "a") + if have == 1: + f.write("#define %s\n" % key_up) + elif have == 0: + f.write("/* #undef %s */\n" % key_up) + elif type(have) == IntType: + f.write("#define %s %d\n" % (key_up, have)) + else: + f.write("#define %s %s\n" % (key_up, str(have))) + f.close() + + +def _LogFailed(context, text, msg): + """ + Write to the log about a failed program. + Add line numbers, so that error messages can be understood. + """ + context.Log("Failed program was:\n") + lines = string.split(text, '\n') + if len(lines) and lines[-1] == '': + lines = lines[:-1] # remove trailing empty line + n = 1 + for line in lines: + context.Log("%d: %s\n" % (n, line)) + n = n + 1 + context.Log("Error message: %s\n" % msg) + + +def _lang2suffix(lang): + """ + Convert a language name to a suffix. + When "lang" is empty or None C is assumed. + Returns a tuple (lang, suffix, None) when it works. + For an unrecognized language returns (None, None, msg). + Where: + lang = the unified language name + suffix = the suffix, including the leading dot + msg = an error message + """ + if not lang or lang in ["C", "c"]: + return ("C", ".c", None) + if lang in ["c++", "C++", "cpp", "CXX", "cxx"]: + return ("C++", ".cpp", None) + + return None, None, "Unsupported language: %s" % lang + + +# vim: set sw=4 et sts=4 tw=79 fo+=l: |