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#
# Check for platform specific features and generate configuration header..
#
# This cmake file was written to create a platform specific configuration
# header to handle differences between build platforms. Please add new
# feature checks to this file. Always check the wxWidgets headers first
# before adding new feature checks. The wxWidgets build system does a
# very good job of handling platform and compiler differences.
#
# Should you feel the need to do this:
#
# #ifdef SYSTEM_A
# # include <some_header_for_system_a.h>
# #elif SYSTEM_B
# # include <some_other_header_for_system_b.h>
# #elif SYSTEM_C
# # include <yet_another_header_for_system_c.h>
# #endif
#
# in your source, don't. It is not portable nor is it maintainable.
# Use cmake to detect system specific dependencies and update the
# configuration header instead.
#
# See this link for information on writing cmake system checks:
#
# http://www.vtk.org/Wiki/CMake_HowToDoPlatformChecks
#
# More importantly see "Recommendations for Writing Autoconf Macros" in:
#
# http://www.lrde.epita.fr/~adl/dl/autotools.pdf
#
# for an explanation of why you should do this. Even though this is an
# autotools tutorial. This section clearly explains why checking for
# features is superior to checking for systems. The previous section of
# this tutorial shows how to create a system independent check for _mkdir().
# Consider it a benchmark when writing your own feature tests.
#
macro( perform_feature_checks )
include( CheckIncludeFile )
#include( CheckFunctionExists )
include( CheckLibraryExists )
include( CheckSymbolExists )
include( CheckIncludeFileCXX )
include( CheckCXXSymbolExists )
include( CheckCXXSourceCompiles )
include( CheckCXXCompilerFlag )
check_cxx_compiler_flag( -fvisibility=hidden GXX_HAS_VISIBILITY_FLAG )
check_cxx_compiler_flag( -fvisibility-inlines-hidden GXX_HAS_VISIBILITY_INLINES_FLAG )
check_include_file( "malloc.h" HAVE_MALLOC_H )
# FIXME: Visual C++ does not support the "not" keyword natively. It is
# defined as a macro in <iso646.h>. There should be a cmake macro
# to check if compiler supports the not keyword natively. If not,
# then check for <iso646.h> and include it. Although it doesn't
# appear to cause any problems with other compilers, that doesn't
# mean won't fail somewhere down the line.
check_include_file( "iso646.h" HAVE_ISO646_H )
# The STDINT header file test is required because MinGW under Windows
# doesn't define HAVE_STDINT_H even though it does have it.
#
# We need to add it to the global compiler definitions as config.h is not
# included in pyport.h which is where the problem ocurrs without this
# fix.
check_include_file( "stdint.h" HAVE_STDINT_H )
if( HAVE_STDINT_H )
add_definitions( -DHAVE_STDINT_H )
endif()
# no place is this used, and "HAVE_STRINGS_H", if present in config.h then
# conflicts with /usr/include/python2.6/Python.h. Please rename the macro if
# re-introduce this.
# check_include_file("strings.h" HAVE_STRINGS_H)
check_symbol_exists( strcasecmp "string.h" HAVE_STRCASECMP )
check_symbol_exists( strcasecmp "strings.h" HAVE_STRCASECMP )
check_symbol_exists( strncasecmp "string.h" HAVE_STRNCASECMP )
check_symbol_exists( strncasecmp "strings.h" HAVE_STRNCASECMP )
check_symbol_exists( strtok_r "string.h" HAVE_STRTOKR )
check_cxx_symbol_exists( strcasecmp "string.h" HAVE_STRCASECMP )
check_cxx_symbol_exists( strncasecmp "string.h" HAVE_STRNCASECMP )
# Some platforms define malloc and free in malloc.h instead of stdlib.h.
check_symbol_exists( malloc "stdlib.h" MALLOC_IN_STDLIB_H )
# Check for functions in math.h.
check_include_file( "math.h" HAVE_MATH_H )
# Check for functions in C++ cmath.
check_include_file_cxx( cmath HAVE_CXX_CMATH )
check_cxx_symbol_exists( asinh cmath HAVE_CMATH_ASINH )
check_cxx_symbol_exists( acosh cmath HAVE_CMATH_ACOSH )
check_cxx_symbol_exists( atanh cmath HAVE_CMATH_ATANH )
# CMakes check_cxx_symbol_exists() doesn't work for templates so we must create a
# small program to verify isinf() exists in cmath.
check_cxx_source_compiles( "#include <cmath>\nint main(int argc, char** argv)\n{\n (void)argv;\n std::isinf(1.0); (void)argc;\n return 0;\n}\n" HAVE_CMATH_ISINF )
#check_symbol_exists( clock_gettime "time.h" HAVE_CLOCK_GETTIME ) non-standard library, does not work
check_library_exists( rt clock_gettime "" HAVE_CLOCK_GETTIME )
# HAVE_GETTIMEOFDAY is already in use within 2.9 wxWidgets, so use HAVE_GETTIMEOFDAY_FUNC
check_symbol_exists( gettimeofday "sys/time.h" HAVE_GETTIMEOFDAY_FUNC )
# Check for Posix getc_unlocked() for improved performance over getc(). Fall back to
# getc() on platforms where getc_unlocked() doesn't exist.
check_symbol_exists( getc_unlocked "stdio.h" HAVE_FGETC_NOLOCK )
endmacro( perform_feature_checks )
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