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