These custom Configure tests are in production use in the GPSD scons
recipe. I donate them to the scons project to be redistributed under
its license. Documentation and a usage example follows each one.
The examples are straight from GPSD and in production use.
env['PKG_CONFIG'] = "pkg-config"
The default name of the executable for the freedesktop.org pkg-config
system, widely used for querying information about installed libraries
on Linux and *BSD systems
def CheckPKG(context, name):
context.Message( 'Checking for %s... ' % name )
ret = context.TryAction('%s --exists \'%s\'' % (env['PKG_CONFIG'], name))[0]
context.Result( ret )
return ret
Check whether a specified library registered with pkg-config exists,
returning True if so and False if not. Example:
if config.CheckPKG('ncurses'):
ncurseslibs = pkg_config('ncurses')
------------------------------------------------------------------------
def CheckExecutable(context, testprogram, check_for):
context.Message( 'Checking for %s... ' %(check_for,))
ret = context.TryAction(testprogram)[0]
context.Result( ret )
return ret
Check whether a specified command exists and can be run; returns True
if so and False if not. Takes two arguments; a test command and a name
to be reported in the configure progress message. Example:
config.CheckExecutable('chrpath -v', 'chrpath')
------------------------------------------------------------------------
def CheckCompilerOption(context, option):
context.Message( 'Checking if compiler accepts %s ...' %(option,) )
old_CFLAGS=context.env['CFLAGS']
context.env.Append(CFLAGS=option)
ret = context.TryLink("""
int main(int argc, char **argv) {
return 0;
}
""",'.c')
if not ret:
context.env.Replace(CFLAGS=old_CFLAGS)
context.Result(ret)
return ret
Check whether your compiler accepts a specified option flag. If so,
append it to the CFLAGS variable in the context's environment. Example:
for option in ('-Wextra','-Wall',
'-Wno-uninitialized','-Wno-missing-field-initializers',
'-Wcast-align','-Wmissing-declarations', '-Wmissing-prototypes',
'-Wstrict-prototypes', '-Wpointer-arith', '-Wreturn-type'):
config.CheckCompilerOption(option)
------------------------------------------------------------------------
def CheckHeaderDefines(context, file, define):
context.Message( 'Checking if %s supplies %s ...' %(file,define) )
ret = context.TryLink("""
#include <%s>
#ifndef %s
#error %s is not defined
#endif
int main(int argc, char **argv) {
return 0;
}
""" % (file, define, define),'.c')
context.Result(ret)
return ret
Check whether a specified include file is available and defines a
specified macro; returns True if so, False if not. Example:
if not config.CheckHeaderDefines("sys/ioctl.h", "TIOCMIWAIT"):
announce("Forcing pps=no (TIOCMIWAIT not available)")
env["pps"] = False
------------------------------------------------------------------------
That's all.
--
<a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>
The real point of audits is to instill fear, not to extract revenue;
the IRS aims at winning through intimidation and (thereby) getting
maximum voluntary compliance
-- Paul Strassel, former IRS Headquarters Agent Wall St. Journal 1980
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