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Only add linker option if it is not really there

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This code is run unconditionally each time we do a reconfigure; if the
option is added at each time, they will accumulate (needlessly) on the
command-line, making it harder to inspect the log.
This commit is contained in:
Roland Kaufmann 2013-12-10 21:01:22 +01:00 committed by Bård Skaflestad
parent 3112e465a0
commit 9f1934570b
1 changed files with 17 additions and 5 deletions
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22
cmake/Modules/UseOnlyNeeded.cmake
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@ -4,11 +4,23 @@
# in order to get only the minimal set of dependencies.
function (prepend var_name value)
if (${var_name})
set (${var_name} "${value} ${${var_name}}" PARENT_SCOPE)
else (${var_name})
set (${var_name} "${value}")
endif (${var_name})
# only add the prefix if it is not already at the beginning. this
# prevents the same string to be added at the same place every time
# we check for reconfiguration (e.g. "--as-needed" below)
string (LENGTH "${value}" _val_len)
string (LENGTH "${${var_name}}" _var_len)
if (NOT (${_var_len} LESS ${_val_len}))
string (SUBSTRING "${${var_name}}" 0 ${_val_len} _var_pre)
else (NOT (${_var_len} LESS ${_val_len}))
set (_var_pre)
endif (NOT (${_var_len} LESS ${_val_len}))
if (NOT ("${_var_pre}" STREQUAL "${value}"))
if (${var_name})
set (${var_name} "${value} ${${var_name}}" PARENT_SCOPE)
else (${var_name})
set (${var_name} "${value}")
endif (${var_name})
endif (NOT ("${_var_pre}" STREQUAL "${value}"))
endfunction (prepend var_name value)
# only ELF shared objects can be underlinked, and only GNU will accept