The following issue has been SUBMITTED.
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https://cmake.org/Bug/view.php?id=15963
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Reported By: Bruce Adams
Assigned To:
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Project: CMake
Issue ID: 15963
Category: CMake
Reproducibility: always
Severity: minor
Priority: normal
Status: new
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Date Submitted: 2016-02-09 16:52 EST
Last Modified: 2016-02-09 16:52 EST
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Summary: strange behaviour running readlink via
execute_process
Description:
I'm trying to use readlink -f to get the absolute path to a shared library
following all symlinks.
>readlink -f /opt/gcc4.9.3/lib64/libstdc++.so.6
/opt/gcc4.9.3/lib64/libstdc++.so.6.0.20
but when I do this in cmake it doesn't expand the full path E.g.
set(CPP11_PATH ${CMAKE_CURRENT_BINARY_DIR}/)
execute_process(COMMAND ldd ${CPP11_PATH} COMMAND grep libstdc++ COMMAND awk "{
print $3; }" OUTPUT_VARIABLE LIBSTDCPP_PATH)
message("LIBSTDCPP_PATH=${LIBSTDCPP_PATH}")
execute_process(COMMAND readlink -f ${LIBSTDCPP_PATH} OUTPUT_VARIABLE
LIBSTDCPP_ABSPATH)
message("LIBSTDCPP_ABSPATH=${LIBSTDCPP_ABSPATH}")
prints:
LIBSTDCPP_PATH=/opt/gcc4.9.3/lib64/libstdc++.so.6
LIBSTDCPP_ABSPATH=/opt/gcc4.9.3/lib64/libstdc++.so.6
This also happens if I wrap it in a shell script:
execute_process(COMMAND doreadlink.sh ${LIBSTDCPP_PATH} OUTPUT_VARIABLE
LIBSTDCPP_ABSPATH2)
message("LIBSTDCPP_ABSPATH2=${LIBSTDCPP_ABSPATH2}")
>LIBSTDCPP_ABSPATH2=/opt/gcc4.9.3/lib64/libstdc++.so.6
Steps to Reproduce:
cmake_minimum_required(VERSION 2.8)
project(TEST CXX)
CMake script as below
set(CPP11_PATH ${CMAKE_CURRENT_BINARY_DIR}/cpp11)
execute_process(COMMAND g++ ${CMAKE_CURRENT_SOURCE_DIR}/cpp11.cpp
-o${CPP11_PATH})
execute_process(COMMAND ldd ${CPP11_PATH} COMMAND grep libstdc++ COMMAND awk "{
print $3; }" OUTPUT_VARIABLE LIBSTDCPP_PATH)
message("LIBSTDCPP_PATH=${LIBSTDCPP_PATH}")
execute_process(COMMAND readlink -f ${LIBSTDCPP_PATH} OUTPUT_VARIABLE
LIBSTDCPP_ABSPATH)
message("LIBSTDCPP_ABSPATH=${LIBSTDCPP_ABSPATH}")
Additional Information:
The following is an effective work around
execute_process(COMMAND ldd ${CPP11_PATH} COMMAND grep libstdc++ COMMAND awk "{
print $3; }" COMMAND xargs readlink -f OUTPUT_VARIABLE LIBSTDCPP_PATH)
Originally raised on stackoverflow:
http://stackoverflow.com/questions/35299970/strange-behaviour-with-readlink-under-cmake
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Issue History
Date Modified Username Field Change
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2016-02-09 16:52 Bruce Adams New Issue
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