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