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CMake: add missing variable initialization

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Although CMake uses previously undefined variables like empty strings
it could happen that variables set in the calling context by other
projects initialized some variables with unexpected values.

Example: FLTK_LIBRARIES could have been initialized by previous
  execution of 'find_package(FLTK ...)' in a project using FLTK
This commit is contained in:
Albrecht Schlosser 2022-03-25 15:02:53 +01:00
parent 0ab3ca7cf6
commit 3fb66056d6
1 changed files with 14 additions and 1 deletions
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15
CMake/setup.cmake
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@ -37,7 +37,6 @@ set (FLTK_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
include(GNUInstallDirs)
set (FLTK_BINDIR ${CMAKE_INSTALL_BINDIR} CACHE PATH
"Binary install path relative to CMAKE_INSTALL_PREFIX unless set to an absolute path.")
set (FLTK_LIBDIR ${CMAKE_INSTALL_LIBDIR} CACHE PATH
@ -52,6 +51,20 @@ set (FLTK_DOCDIR ${CMAKE_INSTALL_DATADIR}/doc CACHE PATH
"Non-arch doc install path relative to CMAKE_INSTALL_PREFIX unless set to an absolute path.")
#######################################################################
# initialize internally used variables
# some of these variables are used to *append* other values later
#######################################################################
set (FLTK_LDLIBS "")
set (FLTK_LIBRARIES "")
set (GLLIBS "")
set (IMAGELIBS "")
set (LDFLAGS "")
set (LIBS "")
set (LINK_LIBS "")
set (STATICIMAGELIBS "")
#######################################################################
# platform dependent information
#######################################################################