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Provide function that identifies compiler to patch-level

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Some distributions modify -dumpversion so that it only returns major
and minor numbers, not the patch level. This is usually OK for
determining features, but when debugging the output log, we really
want the full number.
This commit is contained in:
Roland Kaufmann
2013-03-07 11:22:32 +01:00
parent 66d1f396f8
commit bc4057a0d4
1 changed files with 32 additions and 0 deletions
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32
cmake/Modules/UseCompVer.cmake
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@@ -13,3 +13,35 @@ function (get_gcc_version language ver_name)
set (${ver_name} "" PARENT_SCOPE)
endif (CMAKE_${language}_COMPILER_ID STREQUAL GNU)
endfunction (get_gcc_version ver_name)
# less reliable, but includes the patch number
function (get_gcc_patch language ver_name)
if(CMAKE_${language}_COMPILER_ID STREQUAL GNU)
# exec_program is deprecated, but execute_process does't work :-(
exec_program (${CMAKE_${language}_COMPILER}
ARGS ${CMAKE_${language}_COMPILER_ARG1} --version
OUTPUT_VARIABLE _version
)
# split multi-line string into list
if (WIN32)
string (REPLACE "\r\n" ";" _version "${_version}")
else (WIN32)
string (REPLACE "\n" ";" _version "${_version}")
endif (WIN32)
# only keep first line
list (GET _version 0 _version)
# extract version number from it (this is the fragile part)
string (REGEX REPLACE "^.+(\\(.*\\))?.*([0-9]+\\.[0-9]+\\.[0-9]+)" "\\2" _version "${_version}")
# return this to the caller
set (${ver_name} ${_version} PARENT_SCOPE)
else (CMAKE_${language}_COMPILER_ID STREQUAL GNU)
set (${ver_name} "" PARENT_SCOPE)
endif (CMAKE_${language}_COMPILER_ID STREQUAL GNU)
endfunction (get_gcc_patch language ver_name)
function (compiler_info)
if (CMAKE_COMPILER_IS_GNUCXX)
get_gcc_patch (CXX version)
message (STATUS "GNU C++ compiler version: ${version}")
endif (CMAKE_COMPILER_IS_GNUCXX)
endfunction (compiler_info)