Error while install gcc49 in Ubuntu by using linuxbrew

Question

I want to install the latest gcc49 in a Ubuntu Linux, and I am familiar with Homebrew in Mac, so I would like to use the Linux version of it, i.e., Linuxbrew. So I installed Linuxbrew and typed

$ brew install gcc49

The dependencies gmp4, mpfr2 and etc. will be installed first. I have added a if OS.mac? condition in gmp4 so it can be installed successfully, but when installing mpfr2 (also added the condition), the make check failed with the error:

...
/tmp/mpfr2-i5YD/mpfr-2.4.2/tests/.libs/lt-tpow_all: error while loading shared libraries: libgmp.so.3: cannot open shared object file: No such file or directory
FAIL: tpow_all
=======================
148 of 148 tests failed
=======================

As you can see, the tests can not find libgmp.so.3 which is just installed. But gmp4 is keg only since it will conflict with gmp in main repository.

But the configure options are set with the correct location of gmp4:

./configure --disable-dependency-tracking --prefix=/home/dongli/.linuxbrew/Cellar/mpfr2/2.4.2 --with-gmp=/home/dongli/.linuxbrew/opt/gmp4

How to solve this problem? Thanks!

Answer 1

I found the problem, that is the environment has been reset after each system call in Ruby formula. So we need to set the correct LD_LIBRARY_PATH as

if OS.linux?
  ENV["LD_LIBRARY_PATH"] = "#{Formula["..."].opt_prefix}/lib:...:$LD_LIBRARY_PATH"
end

so that LD_LIBRARY_PATH persists during the build processes.

Answer 2

You think you are doing it wrong by insisting on a third-party scripting solution that is not native to the OS.

There are prebuilt versions of gcc et al provided by the same maintainers in this PPA on Launchpad. These are previews / testreleases of what will be in the next Ubuntu releases.