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daid kahl wrote: |
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> Hello, |
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> |
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> I have encountered a problem maintaining my system using revdep-rebuild. I |
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> have both gcc-3.4.6 and gcc-4.3.2 installed on my machine. I mainly use |
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> gcc4, but sometimes I need g77 because many people at my laboratory use |
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> fortran code that is not compliant with gfortran standards. |
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> |
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> However, I have an Intel duo Core machine, so I usually have the CFLAG |
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> march=core2, but this is not supported in gcc3. Thus, if I need to rebuild |
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> gcc3 during revdep-rebuild, I have to do most of the updates by hand so that |
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> I can turn on an older march setting for gcc3 (such as march=nocona). |
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> |
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> Is there some way to set specfic CFLAGS for different gcc installs? Is my |
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> method of manually having different architectures for different gcc |
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> installations a risk? |
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> |
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> Regards, |
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> daid |
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> |
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|
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It is possible, although unsupported, to set CFLAGS/CXXFLAGS for a |
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particular version of a package. The bashrc for the base profile (which |
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all modern profiles inherit from) will attempt to source, if they exist, |
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the following files: |
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|
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/etc/portage/env/${CATEGORY}/${PN} |
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/etc/portage/env/${CATEGORY}/${PN}-${PV} |
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/etc/portage/env/${CATEGORY}/${PN}-${PV}-${PR} |
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|
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(where for sys-devel/gcc-3.4.6-r2, CATEGORY=sys-devel, PN=gcc, PV=3.4.6, |
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and PR=r2 (when there is no "-r#" part, PR=r0)) |
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|
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In one of those files, you can export a new value for CFLAGS/CXXFLAGS. |
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Note that not all portage variables can be changed in this manner. (To |
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be precise, variables that are referenced from the parts of portage |
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written in bash can be changed in this manner.) Also note that if you |
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have 'CXXFLAGS="${CFLAGS}"' in your make.conf, this will set CXXFLAGS to |
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the value of CFLAGS *that is in make.conf*, so you will need to modify |
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CXXFLAGS as well as CFLAGS. |
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|
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- -- |
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ABCD |
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iEYEARECAAYFAkmNIhcACgkQOypDUo0oQOpmzwCbBmDk9w0vdr1OxO8YPBeLhQBq |
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lqkAoJ41FE04llfOHF1RH1DG0rUxJg9d |
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=rEti |
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