75 lines
3.0 KiB
CMake
75 lines
3.0 KiB
CMake
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#
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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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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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check_include_file("strings.h" HAVE_STRINGS_H)
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include(CheckSymbolExists)
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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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# 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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# Use ISO C++ conformant names to disable Visual C++ warnings.
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check_symbol_exists(_stricmp "string.h" HAVE_ISO_STRICMP)
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check_symbol_exists(_strnicmp "string.h" HAVE_ISO_STRNICMP)
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check_symbol_exists(_snprintf "stdio.h" HAVE_ISO_SNPRINTF)
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check_symbol_exists(_hypot "math.h" HAVE_ISO_HYPOT)
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# Generate config.h.
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configure_file(${CMAKE_SOURCE_DIR}/CMakeModules/config.h.cmake
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${CMAKE_BINARY_DIR}/config.h)
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endmacro(perform_feature_checks)
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