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cmake 3.5 compatibility #548

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cmake 3.5 compatibility #548

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19 changes: 12 additions & 7 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@

#]===================================================================]

cmake_minimum_required( VERSION 3.7 )
cmake_minimum_required( VERSION 3.5 )

project( date VERSION 2.4.1 )

Expand All @@ -24,7 +24,12 @@ include( GNUInstallDirs )
get_directory_property( has_parent PARENT_DIRECTORY )

# Override by setting on CMake command line.
set( CMAKE_CXX_STANDARD 17 CACHE STRING "The C++ standard whose features are requested." )
if( NOT CMAKE_VERSION VERSION_LESS 3.8 )
set( CMAKE_CXX_STANDARD 17 CACHE STRING "The C++ standard whose features are requested." )
else( )
# 17 isn't understood before cmake 3.8, so fall back to 14
set( CMAKE_CXX_STANDARD 14 CACHE STRING "The C++ standard whose features are requested." )
endif( )

option( USE_SYSTEM_TZ_DB "Use the operating system's timezone database" OFF )
option( MANUAL_TZ_DB "User will set TZ DB manually by invoking set_install in their code" OFF )
Expand Down Expand Up @@ -71,13 +76,13 @@ target_sources( date INTERFACE
$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include/date/iso_week.h>
$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include/date/julian.h>
)
if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.15)
if (NOT CMAKE_VERSION VERSION_LESS 3.15)
# public headers will get installed:
set_target_properties( date PROPERTIES PUBLIC_HEADER include/date/date.h )
endif ()
target_compile_definitions( date INTERFACE
#To workaround libstdc++ issue https://github.com/HowardHinnant/date/issues/388
ONLY_C_LOCALE=$<IF:$<BOOL:${COMPILE_WITH_C_LOCALE}>,1,0>
ONLY_C_LOCALE=$<BOOL:${COMPILE_WITH_C_LOCALE}>
$<$<BOOL:${DISABLE_STRING_VIEW}>:HAS_STRING_VIEW=0> )

#[===================================================================[
Expand All @@ -100,12 +105,12 @@ if( BUILD_TZ_LIB )
$<INSTALL_INTERFACE:include> )
target_compile_definitions( tz
PRIVATE
AUTO_DOWNLOAD=$<IF:$<OR:$<BOOL:${USE_SYSTEM_TZ_DB}>,$<BOOL:${MANUAL_TZ_DB}>>,0,1>
HAS_REMOTE_API=$<IF:$<OR:$<BOOL:${USE_SYSTEM_TZ_DB}>,$<BOOL:${MANUAL_TZ_DB}>>,0,1>
AUTO_DOWNLOAD=$<NOT:$<OR:$<BOOL:${USE_SYSTEM_TZ_DB}>,$<BOOL:${MANUAL_TZ_DB}>>>
HAS_REMOTE_API=$<NOT:$<OR:$<BOOL:${USE_SYSTEM_TZ_DB}>,$<BOOL:${MANUAL_TZ_DB}>>>
$<$<AND:$<BOOL:${WIN32}>,$<BOOL:${BUILD_SHARED_LIBS}>>:DATE_BUILD_DLL=1>
$<$<BOOL:${USE_TZ_DB_IN_DOT}>:INSTALL=.>
PUBLIC
USE_OS_TZDB=$<IF:$<AND:$<BOOL:${USE_SYSTEM_TZ_DB}>,$<NOT:$<BOOL:${WIN32}>>,$<NOT:$<BOOL:${MANUAL_TZ_DB}>>>,1,0>
USE_OS_TZDB=$<AND:$<BOOL:${USE_SYSTEM_TZ_DB}>,$<NOT:$<BOOL:${WIN32}>>,$<NOT:$<BOOL:${MANUAL_TZ_DB}>>>
INTERFACE
$<$<AND:$<BOOL:${WIN32}>,$<BOOL:${BUILD_SHARED_LIBS}>>:DATE_USE_DLL=1> )
set(TZ_HEADERS include/date/tz.h)
Expand Down