From eef8d981398137e242decb3073289d0fb7725451 Mon Sep 17 00:00:00 2001 From: Gael Guennebaud Date: Tue, 18 Jun 2013 17:25:37 +0200 Subject: [PATCH] Fix bug #542: fix detection of compiler version on systems without the head command. --- cmake/EigenTesting.cmake | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/cmake/EigenTesting.cmake b/cmake/EigenTesting.cmake index 3780888af..d9e22ab1a 100644 --- a/cmake/EigenTesting.cmake +++ b/cmake/EigenTesting.cmake @@ -322,13 +322,21 @@ macro(ei_get_compilerver VAR) endif() else() # on all other system we rely on ${CMAKE_CXX_COMPILER} - # supporting a "--version" flag - execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version - COMMAND head -n 1 - OUTPUT_VARIABLE eigen_cxx_compiler_version_string OUTPUT_STRIP_TRAILING_WHITESPACE) + # supporting a "--version" flag - ei_get_compilerver_from_cxx_version_string(${eigen_cxx_compiler_version_string} CNAME CVER) + # check whether the head command exists + find_program(HEAD_EXE head NO_CMAKE_ENVIRONMENT_PATH NO_CMAKE_PATH NO_CMAKE_SYSTEM_PATH) + if(HEAD_EXE) + execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version + COMMAND head -n 1 + OUTPUT_VARIABLE eigen_cxx_compiler_version_string OUTPUT_STRIP_TRAILING_WHITESPACE) + else() + execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version + OUTPUT_VARIABLE eigen_cxx_compiler_version_string OUTPUT_STRIP_TRAILING_WHITESPACE) + string(REGEX REPLACE "[\n\r].*" "" eigen_cxx_compiler_version_string ${eigen_cxx_compiler_version_string}) + endif() + ei_get_compilerver_from_cxx_version_string("${eigen_cxx_compiler_version_string}" CNAME CVER) set(${VAR} "${CNAME}-${CVER}") endif() endmacro(ei_get_compilerver)