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2869c9f49a
CMake 3.0 defines two new variables: * CMAKE_CXX_VISIBILITY_PRESET and * CMAKE_VISIBILITY_INLINES_HIDDEN to control whether symbols not explicitly tagged for export are implicitly exported. Because only version 3.3 and later also applies that to static libraries when in 3.3 mode, compatibility code is added as well. When the minimum required version is bumped to 3.3, this code becomes obsolete and a warning is displayed that the compatibility code should be removed as well.
114 lines
4.8 KiB
CMake
114 lines
4.8 KiB
CMake
#
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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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if( HAVE_STDINT_H )
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add_definitions( -DHAVE_STDINT_H )
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endif()
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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_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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