man builder-c++ (Commandes) - g++ wrapper to facilitate pentium-optimizations
NAME
builder-c++ - g++ wrapper to facilitate pentium-optimizations
SYNOPSIS
export DEBIAN_BUILDARCH=architecture
export DEBIAN_BUILDGCCVER=gcc-version
g++
...
DESCRIPTION
The builder-c++ wrapper is normally used by calling g++ as usual. If the environment variable DEBIAN_BUILDARCH is not set, builder-c++ does nothing, and the real g++ is invoked with the specified arguments.
When the DEBIAN_BUILDARCH environment variable is set, builder-c++ invokes g++ with the specified arguments, plus -mcpu=DEBIAN_BUILDARCH -march=DEBIAN_BUILDARCH This has the effect of telling g++ to use architecture-specific optimizations without changing the command line. This is particularly useful for package builds.
If DEBAIN_BUILDGCCVER is not set, builder-c++ calls g++.real. If DEBIAN_BUILDGCCVER is set, builder-c++ calls g++-DEBIAN_BUILDGCCVER instead.
ENVIRONMENT
- DEBIAN_BUILDARCH
- If set, the architecture to compile for. Useful values are pentium or pentiumpro.
- DEBIAN_BUILDGCCVER
- If set, the version of g++ to be invoked. Useful values are 3.0 or 2.95.
NOTES
The real g++ is renamed g++.real, and a diversion is registered with dpkg-divert(1). Thus builder-c++'s idea of the default g++ is dictated by whatever package installed /usr/bin/g++.