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On Ubuntu 19.04, I have to build a project that requires an older gcc version that one installed in my system. For certain reasons, I cannot modify makefiles; during the build, gcc command must invoke older gcc, not the default version. How do I achieve that without breaking the default gcc currently installed in the system?

olegst
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  • Does the software's build process invoke `gcc` directly, or does the makefile do something like setting `CC := gcc` in which case you may be able to override it on the command line like `make CC=path/to/old/gcc`? – steeldriver Oct 23 '19 at 12:12
  • @steeldriver Through an internal variable which cannot be controlled from outside. Currently I just fixed it in the makefile with gcc-6 instead of gcc, but as soon as I start working with the repository I'm going to have a headache. – olegst Oct 24 '19 at 11:36
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    Possible duplicate of [How to use multiple instances of gcc?](https://askubuntu.com/questions/313288/how-to-use-multiple-instances-of-gcc) – karel Oct 24 '19 at 11:50

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As it turned out, they call gcc through their own internal variable where they also add some flags. After I overrode it from command line:

make CCCMD='gcc-6 ...'

it got fixed.

I just forgot about overriding feature of make.

olegst
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