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Diffstat (limited to 'CMakeModules/PerformFeatureChecks.cmake')
| -rw-r--r-- | CMakeModules/PerformFeatureChecks.cmake | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/CMakeModules/PerformFeatureChecks.cmake b/CMakeModules/PerformFeatureChecks.cmake new file mode 100644 index 0000000..0240046 --- /dev/null +++ b/CMakeModules/PerformFeatureChecks.cmake @@ -0,0 +1,115 @@ +# +# 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 ) |