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CMake/Modules/CMakeGenericSystem.cmake
Brad King 86578eccf2 Simplify CMake per-source license notices 
Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool.  Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience.  Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.

Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices.  It also references version control
history for more precise information.  Therefore we no longer need to spell
out the list of Contributors in each source file notice.

Replace CMake per-source copyright/license notice headers with a short
description of the license and links to `Copyright.txt` and online information
available from "https://cmake.org/licensing".  The online URL also handles
cases of modules being copied out of our source into other projects, so we
can drop our notices about replacing links with full license text.

Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority
of the replacements mechanically.  Manually fix up shebang lines and trailing
newlines in a few files.  Manually update the notices in a few files that the
script does not handle.
2016-09-27 15:14:44 -04:00

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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
set(CMAKE_SHARED_LIBRARY_C_FLAGS "") # -pic
set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared") # -shared
set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "") # +s, flag for exe link to use shared lib
set(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "") # -rpath
set(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP "") # : or empty
set(CMAKE_INCLUDE_FLAG_C "-I") # -I
set(CMAKE_INCLUDE_FLAG_C_SEP "") # , or empty
set(CMAKE_LIBRARY_PATH_FLAG "-L")
set(CMAKE_LIBRARY_PATH_TERMINATOR "") # for the Digital Mars D compiler the link paths have to be terminated with a "/"
set(CMAKE_LINK_LIBRARY_FLAG "-l")
set(CMAKE_LINK_LIBRARY_SUFFIX "")
set(CMAKE_STATIC_LIBRARY_PREFIX "lib")
set(CMAKE_STATIC_LIBRARY_SUFFIX ".a")
set(CMAKE_SHARED_LIBRARY_PREFIX "lib") # lib
set(CMAKE_SHARED_LIBRARY_SUFFIX ".so") # .so
set(CMAKE_EXECUTABLE_SUFFIX "") # .exe
set(CMAKE_DL_LIBS "dl")
set(CMAKE_FIND_LIBRARY_PREFIXES "lib")
set(CMAKE_FIND_LIBRARY_SUFFIXES ".so" ".a")
# basically all general purpose OSs support shared libs
set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS TRUE)
set (CMAKE_SKIP_RPATH "NO" CACHE BOOL
"If set, runtime paths are not added when using shared libraries.")
set (CMAKE_SKIP_INSTALL_RPATH "NO" CACHE BOOL
"If set, runtime paths are not added when installing shared libraries, but are added when building.")
set(CMAKE_VERBOSE_MAKEFILE FALSE CACHE BOOL "If this value is on, makefiles will be generated without the .SILENT directive, and all commands will be echoed to the console during the make. This is useful for debugging only. With Visual Studio IDE projects all commands are done without /nologo.")
if(CMAKE_GENERATOR MATCHES "Make")
set(CMAKE_COLOR_MAKEFILE ON CACHE BOOL
"Enable/Disable color output during build."
)
mark_as_advanced(CMAKE_COLOR_MAKEFILE)
if(DEFINED CMAKE_RULE_MESSAGES)
set_property(GLOBAL PROPERTY RULE_MESSAGES ${CMAKE_RULE_MESSAGES})
endif()
if(DEFINED CMAKE_TARGET_MESSAGES)
set_property(GLOBAL PROPERTY TARGET_MESSAGES ${CMAKE_TARGET_MESSAGES})
endif()
if(CMAKE_GENERATOR MATCHES "Unix Makefiles")
set(CMAKE_EXPORT_COMPILE_COMMANDS OFF CACHE BOOL
"Enable/Disable output of compile commands during generation."
)
mark_as_advanced(CMAKE_EXPORT_COMPILE_COMMANDS)
endif()
endif()
if(CMAKE_GENERATOR MATCHES "Ninja")
set(CMAKE_EXPORT_COMPILE_COMMANDS OFF CACHE BOOL
"Enable/Disable output of compile commands during generation."
)
mark_as_advanced(CMAKE_EXPORT_COMPILE_COMMANDS)
endif()
# GetDefaultWindowsPrefixBase
#
# Compute the base directory for CMAKE_INSTALL_PREFIX based on:
# - is this 32-bit or 64-bit Windows
# - is this 32-bit or 64-bit CMake running
# - what architecture targets will be built
#
function(GetDefaultWindowsPrefixBase var)
# Try to guess what architecture targets will end up being built as,
# even if CMAKE_SIZEOF_VOID_P is not computed yet... We need to know
# the architecture of the targets being built to choose the right
# default value for CMAKE_INSTALL_PREFIX.
#
if("${CMAKE_GENERATOR}" MATCHES "(Win64|IA64)")
set(arch_hint "x64")
elseif("${CMAKE_GENERATOR}" MATCHES "ARM")
set(arch_hint "ARM")
elseif("${CMAKE_SIZEOF_VOID_P}" STREQUAL "8")
set(arch_hint "x64")
elseif("$ENV{LIB}" MATCHES "(amd64|ia64)")
set(arch_hint "x64")
endif()
if(NOT arch_hint)
set(arch_hint "x86")
endif()
# default env in a 64-bit app on Win64:
# ProgramFiles=C:\Program Files
# ProgramFiles(x86)=C:\Program Files (x86)
# ProgramW6432=C:\Program Files
#
# default env in a 32-bit app on Win64:
# ProgramFiles=C:\Program Files (x86)
# ProgramFiles(x86)=C:\Program Files (x86)
# ProgramW6432=C:\Program Files
#
# default env in a 32-bit app on Win32:
# ProgramFiles=C:\Program Files
# ProgramFiles(x86) NOT DEFINED
# ProgramW6432 NOT DEFINED
# By default, use the ProgramFiles env var as the base value of
# CMAKE_INSTALL_PREFIX:
#
set(_PREFIX_ENV_VAR "ProgramFiles")
if ("$ENV{ProgramW6432}" STREQUAL "")
# running on 32-bit Windows
# must be a 32-bit CMake, too...
#message("guess: this is a 32-bit CMake running on 32-bit Windows")
else()
# running on 64-bit Windows
if ("$ENV{ProgramW6432}" STREQUAL "$ENV{ProgramFiles}")
# 64-bit CMake
#message("guess: this is a 64-bit CMake running on 64-bit Windows")
if(NOT "${arch_hint}" STREQUAL "x64")
# building 32-bit targets
set(_PREFIX_ENV_VAR "ProgramFiles(x86)")
endif()
else()
# 32-bit CMake
#message("guess: this is a 32-bit CMake running on 64-bit Windows")
if("${arch_hint}" STREQUAL "x64")
# building 64-bit targets
set(_PREFIX_ENV_VAR "ProgramW6432")
endif()
endif()
endif()
#if("${arch_hint}" STREQUAL "x64")
# message("guess: you are building a 64-bit app")
#else()
# message("guess: you are building a 32-bit app")
#endif()
if(NOT "$ENV{${_PREFIX_ENV_VAR}}" STREQUAL "")
file(TO_CMAKE_PATH "$ENV{${_PREFIX_ENV_VAR}}" _base)
elseif(NOT "$ENV{SystemDrive}" STREQUAL "")
set(_base "$ENV{SystemDrive}/Program Files")
else()
set(_base "C:/Program Files")
endif()
set(${var} "${_base}" PARENT_SCOPE)
endfunction()
# Set a variable to indicate whether the value of CMAKE_INSTALL_PREFIX
# was initialized by the block below. This is useful for user
# projects to change the default prefix while still allowing the
# command line to override it.
if(NOT DEFINED CMAKE_INSTALL_PREFIX)
set(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT 1)
endif()
# Choose a default install prefix for this platform.
if(CMAKE_HOST_UNIX)
set(CMAKE_INSTALL_PREFIX "/usr/local"
CACHE PATH "Install path prefix, prepended onto install directories.")
else()
GetDefaultWindowsPrefixBase(CMAKE_GENERIC_PROGRAM_FILES)
set(CMAKE_INSTALL_PREFIX
"${CMAKE_GENERIC_PROGRAM_FILES}/${PROJECT_NAME}"
CACHE PATH "Install path prefix, prepended onto install directories.")
set(CMAKE_GENERIC_PROGRAM_FILES)
endif()
# Set a variable which will be used as component name in install() commands
# where no COMPONENT has been given:
set(CMAKE_INSTALL_DEFAULT_COMPONENT_NAME "Unspecified")
mark_as_advanced(
CMAKE_SKIP_RPATH
CMAKE_SKIP_INSTALL_RPATH
CMAKE_VERBOSE_MAKEFILE
)
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