nixpkgs-suyu/pkgs/stdenv/generic/setup.sh
Vladimír Čunát d978c35ff9 stdenv/setup.sh: fix previous change...
for the case that there is no makefile. CC #1354
2013-12-28 10:43:34 +01:00

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# Run the named hook, either by calling the function with that name or
# by evaluating the variable with that name. This allows convenient
# setting of hooks both from Nix expressions (as attributes /
# environment variables) and from shell scripts (as functions).
runHook() {
local hookName="$1"
case "$(type -t $hookName)" in
(function|alias|builtin) $hookName;;
(file) source $hookName;;
(keyword) :;;
(*) eval "${!hookName}";;
esac
}
exitHandler() {
exitCode=$?
set +e
closeNest
if [ -n "$showBuildStats" ]; then
times > "$NIX_BUILD_TOP/.times"
local -a times=($(cat "$NIX_BUILD_TOP/.times"))
# Print the following statistics:
# - user time for the shell
# - system time for the shell
# - user time for all child processes
# - system time for all child processes
echo "build time elapsed: " ${times[*]}
fi
if [ $exitCode != 0 ]; then
runHook failureHook
# If the builder had a non-zero exit code and
# $succeedOnFailure is set, create the file
# `$out/nix-support/failed' to signal failure, and exit
# normally. Otherwise, return the original exit code.
if [ -n "$succeedOnFailure" ]; then
echo "build failed with exit code $exitCode (ignored)"
mkdir -p "$out/nix-support"
echo -n $exitCode > "$out/nix-support/failed"
exit 0
fi
else
runHook exitHook
fi
exit $exitCode
}
trap "exitHandler" EXIT
######################################################################
# Helper functions that might be useful in setup hooks.
addToSearchPathWithCustomDelimiter() {
local delimiter=$1
local varName=$2
local dir=$3
if [ -d "$dir" ]; then
eval export ${varName}=${!varName}${!varName:+$delimiter}${dir}
fi
}
PATH_DELIMITER=':'
addToSearchPath() {
addToSearchPathWithCustomDelimiter "${PATH_DELIMITER}" "$@"
}
######################################################################
# Initialisation.
set -e
[ -z $NIX_GCC ] && NIX_GCC=@gcc@
# Wildcard expansions that don't match should expand to an empty list.
# This ensures that, for instance, "for i in *; do ...; done" does the
# right thing.
shopt -s nullglob
# Set up the initial path.
PATH=
for i in $NIX_GCC @initialPath@; do
if [ "$i" = / ]; then i=; fi
addToSearchPath PATH $i/bin
done
if [ "$NIX_DEBUG" = 1 ]; then
echo "initial path: $PATH"
fi
# Execute the pre-hook.
export SHELL=@shell@
if [ -z "$shell" ]; then export shell=@shell@; fi
runHook preHook
# Check that the pre-hook initialised SHELL.
if [ -z "$SHELL" ]; then echo "SHELL not set"; exit 1; fi
# Hack: run gcc's setup hook.
envHooks=()
crossEnvHooks=()
if [ -f $NIX_GCC/nix-support/setup-hook ]; then
source $NIX_GCC/nix-support/setup-hook
fi
# Ensure that the given directories exists.
ensureDir() {
local dir
for dir in "$@"; do
if ! [ -x "$dir" ]; then mkdir -p "$dir"; fi
done
}
installBin() {
mkdir -p $out/bin
cp "$@" $out/bin
}
# Allow the caller to augment buildInputs (it's not always possible to
# do this before the call to setup.sh, since the PATH is empty at that
# point; here we have a basic Unix environment).
runHook addInputsHook
# Recursively find all build inputs.
findInputs() {
local pkg=$1
local var=$2
local propagatedBuildInputsFile=$3
case ${!var} in
*\ $pkg\ *)
return 0
;;
esac
eval $var="'${!var} $pkg '"
if [ -f $pkg/nix-support/setup-hook ]; then
source $pkg/nix-support/setup-hook
fi
if [ -f $pkg/nix-support/$propagatedBuildInputsFile ]; then
for i in $(cat $pkg/nix-support/$propagatedBuildInputsFile); do
findInputs $i $var $propagatedBuildInputsFile
done
fi
}
crossPkgs=""
for i in $buildInputs $propagatedBuildInputs; do
findInputs $i crossPkgs propagated-build-inputs
done
nativePkgs=""
for i in $nativeBuildInputs $propagatedNativeBuildInputs; do
findInputs $i nativePkgs propagated-native-build-inputs
done
# Set the relevant environment variables to point to the build inputs
# found above.
addToNativeEnv() {
local pkg=$1
if [ -d $1/bin ]; then
addToSearchPath _PATH $1/bin
fi
# Run the package-specific hooks set by the setup-hook scripts.
for i in "${envHooks[@]}"; do
$i $pkg
done
}
for i in $nativePkgs; do
addToNativeEnv $i
done
addToCrossEnv() {
local pkg=$1
# Some programs put important build scripts (freetype-config and similar)
# into their crossDrv bin path. Intentionally these should go after
# the nativePkgs in PATH.
if [ -d $1/bin ]; then
addToSearchPath _PATH $1/bin
fi
# Run the package-specific hooks set by the setup-hook scripts.
for i in "${crossEnvHooks[@]}"; do
$i $pkg
done
}
for i in $crossPkgs; do
addToCrossEnv $i
done
# Add the output as an rpath.
if [ "$NIX_NO_SELF_RPATH" != 1 ]; then
export NIX_LDFLAGS="-rpath $out/lib $NIX_LDFLAGS"
if [ -n "$NIX_LIB64_IN_SELF_RPATH" ]; then
export NIX_LDFLAGS="-rpath $out/lib64 $NIX_LDFLAGS"
fi
if [ -n "$NIX_LIB32_IN_SELF_RPATH" ]; then
export NIX_LDFLAGS="-rpath $out/lib32 $NIX_LDFLAGS"
fi
fi
# Set the TZ (timezone) environment variable, otherwise commands like
# `date' will complain (e.g., `Tue Mar 9 10:01:47 Local time zone must
# be set--see zic manual page 2004').
export TZ=UTC
# Set the prefix. This is generally $out, but it can be overriden,
# for instance if we just want to perform a test build/install to a
# temporary location and write a build report to $out.
if [ -z "$prefix" ]; then
prefix="$out";
fi
if [ "$useTempPrefix" = 1 ]; then
prefix="$NIX_BUILD_TOP/tmp_prefix";
fi
PATH=$_PATH${_PATH:+:}$PATH
if [ "$NIX_DEBUG" = 1 ]; then
echo "final path: $PATH"
fi
# Make GNU Make produce nested output.
export NIX_INDENT_MAKE=1
# Normalize the NIX_BUILD_CORES variable. The value might be 0, which
# means that we're supposed to try and auto-detect the number of
# available CPU cores at run-time.
if [ -z "${NIX_BUILD_CORES:-}" ]; then
NIX_BUILD_CORES="1"
elif [ "$NIX_BUILD_CORES" -le 0 ]; then
NIX_BUILD_CORES=$(nproc 2>/dev/null || true)
if expr >/dev/null 2>&1 "$NIX_BUILD_CORES" : "^[0-9][0-9]*$"; then
:
else
NIX_BUILD_CORES="1"
fi
fi
export NIX_BUILD_CORES
######################################################################
# Misc. helper functions.
stripDirs() {
local dirs="$1"
local stripFlags="$2"
local dirsNew=
for d in ${dirs}; do
if [ -d "$prefix/$d" ]; then
dirsNew="${dirsNew} $prefix/$d "
fi
done
dirs=${dirsNew}
if [ -n "${dirs}" ]; then
header "stripping (with flags $stripFlags) in $dirs"
for dir in $dirs; do
test -L "$dir" || chmod -R +rw "$dir"
done
find $dirs -type f -print0 | xargs -0 ${xargsFlags:--r} strip $stripFlags || true
stopNest
fi
}
######################################################################
# Textual substitution functions.
substitute() {
local input="$1"
local output="$2"
local -a params=("$@")
local n p pattern replacement varName
local content="$(cat $input)"
for ((n = 2; n < ${#params[*]}; n += 1)); do
p=${params[$n]}
if [ "$p" = --replace ]; then
pattern="${params[$((n + 1))]}"
replacement="${params[$((n + 2))]}"
n=$((n + 2))
fi
if [ "$p" = --subst-var ]; then
varName="${params[$((n + 1))]}"
pattern="@$varName@"
replacement="${!varName}"
n=$((n + 1))
fi
if [ "$p" = --subst-var-by ]; then
pattern="@${params[$((n + 1))]}@"
replacement="${params[$((n + 2))]}"
n=$((n + 2))
fi
content="${content//"$pattern"/$replacement}"
done
# !!! This doesn't work properly if $content is "-n".
echo -n "$content" > "$output".tmp
if [ -x "$output" ]; then chmod +x "$output".tmp; fi
mv -f "$output".tmp "$output"
}
substituteInPlace() {
local fileName="$1"
shift
substitute "$fileName" "$fileName" "$@"
}
substituteAll() {
local input="$1"
local output="$2"
# Select all environment variables that start with a lowercase character.
for envVar in $(env | sed "s/^[^a-z].*//" | sed "s/^\([^=]*\)=.*/\1/"); do
if [ "$NIX_DEBUG" = "1" ]; then
echo "$envVar -> ${!envVar}"
fi
args="$args --subst-var $envVar"
done
substitute "$input" "$output" $args
}
substituteAllInPlace() {
local fileName="$1"
shift
substituteAll "$fileName" "$fileName" "$@"
}
######################################################################
# What follows is the generic builder.
nestingLevel=0
startNest() {
nestingLevel=$(($nestingLevel + 1))
echo -en "\033[$1p"
}
stopNest() {
nestingLevel=$(($nestingLevel - 1))
echo -en "\033[q"
}
header() {
startNest "$2"
echo "$1"
}
# Make sure that even when we exit abnormally, the original nesting
# level is properly restored.
closeNest() {
while [ $nestingLevel -gt 0 ]; do
stopNest
done
}
# This function is useful for debugging broken Nix builds. It dumps
# all environment variables to a file `env-vars' in the build
# directory. If the build fails and the `-K' option is used, you can
# then go to the build directory and source in `env-vars' to reproduce
# the environment used for building.
dumpVars() {
if [ "$noDumpEnvVars" != 1 ]; then
export > "$NIX_BUILD_TOP/env-vars"
fi
}
# Utility function: return the base name of the given path, with the
# prefix `HASH-' removed, if present.
stripHash() {
strippedName=$(basename $1);
if echo "$strippedName" | grep -q '^[a-z0-9]\{32\}-'; then
strippedName=$(echo "$strippedName" | cut -c34-)
fi
}
unpackFile() {
curSrc="$1"
local cmd
header "unpacking source archive $curSrc" 3
case "$curSrc" in
*.tar.xz | *.tar.lzma)
# Don't rely on tar knowing about .xz.
xz -d < $curSrc | tar xf -
;;
*.tar | *.tar.* | *.tgz | *.tbz2)
# GNU tar can automatically select the decompression method
# (info "(tar) gzip").
tar xf $curSrc
;;
*.zip)
unzip -qq $curSrc
;;
*)
if [ -d "$curSrc" ]; then
stripHash $curSrc
cp -prd --no-preserve=timestamps $curSrc $strippedName
else
if [ -z "$unpackCmd" ]; then
echo "source archive $curSrc has unknown type"
exit 1
fi
runHook unpackCmd
fi
;;
esac
stopNest
}
unpackPhase() {
runHook preUnpack
if [ -z "$srcs" ]; then
if [ -z "$src" ]; then
echo 'variable $src or $srcs should point to the source'
exit 1
fi
srcs="$src"
fi
# To determine the source directory created by unpacking the
# source archives, we record the contents of the current
# directory, then look below which directory got added. Yeah,
# it's rather hacky.
local dirsBefore=""
for i in *; do
if [ -d "$i" ]; then
dirsBefore="$dirsBefore $i "
fi
done
# Unpack all source archives.
for i in $srcs; do
unpackFile $i
done
# Find the source directory.
if [ -n "$setSourceRoot" ]; then
runHook setSourceRoot
elif [ -z "$sourceRoot" ]; then
sourceRoot=
for i in *; do
if [ -d "$i" ]; then
case $dirsBefore in
*\ $i\ *)
;;
*)
if [ -n "$sourceRoot" ]; then
echo "unpacker produced multiple directories"
exit 1
fi
sourceRoot="$i"
;;
esac
fi
done
fi
if [ -z "$sourceRoot" ]; then
echo "unpacker appears to have produced no directories"
exit 1
fi
echo "source root is $sourceRoot"
# By default, add write permission to the sources. This is often
# necessary when sources have been copied from other store
# locations.
if [ "$dontMakeSourcesWritable" != 1 ]; then
chmod -R u+w "$sourceRoot"
fi
runHook postUnpack
}
patchPhase() {
runHook prePatch
for i in $patches; do
header "applying patch $i" 3
local uncompress=cat
case $i in
*.gz)
uncompress="gzip -d"
;;
*.bz2)
uncompress="bzip2 -d"
;;
*.xz)
uncompress="xz -d"
;;
*.lzma)
uncompress="lzma -d"
;;
esac
# "2>&1" is a hack to make patch fail if the decompressor fails (nonexistent patch, etc.)
$uncompress < $i 2>&1 | patch ${patchFlags:--p1}
stopNest
done
runHook postPatch
}
fixLibtool() {
sed -i -e 's^eval sys_lib_.*search_path=.*^^' "$1"
}
configurePhase() {
runHook preConfigure
if [ -z "$configureScript" ]; then
configureScript=./configure
if ! [ -x $configureScript ]; then
echo "no configure script, doing nothing"
return
fi
fi
if [ -z "$dontFixLibtool" ]; then
for i in $(find . -name "ltmain.sh"); do
echo "fixing libtool script $i"
fixLibtool $i
done
fi
if [ -z "$dontAddPrefix" ]; then
configureFlags="${prefixKey:---prefix=}$prefix $configureFlags"
fi
# Add --disable-dependency-tracking to speed up some builds.
if [ -z "$dontAddDisableDepTrack" ]; then
if grep -q dependency-tracking $configureScript; then
configureFlags="--disable-dependency-tracking $configureFlags"
fi
fi
# By default, disable static builds.
if [ -z "$dontDisableStatic" ]; then
if grep -q enable-static $configureScript; then
configureFlags="--disable-static $configureFlags"
fi
fi
echo "configure flags: $configureFlags ${configureFlagsArray[@]}"
$configureScript $configureFlags "${configureFlagsArray[@]}"
runHook postConfigure
}
buildPhase() {
runHook preBuild
if [ -z "$makeFlags" ] && ! [ -n "$makefile" -o -e "Makefile" -o -e "makefile" -o -e "GNUmakefile" ]; then
echo "no Makefile, doing nothing"
return
fi
# see https://github.com/NixOS/nixpkgs/pull/1354#issuecomment-31260409
makeFlags="${makeFlags} SHELL=${SHELL}"
echo "make flags: $makeFlags ${makeFlagsArray[@]} $buildFlags ${buildFlagsArray[@]}"
make ${makefile:+-f $makefile} \
${enableParallelBuilding:+-j${NIX_BUILD_CORES} -l${NIX_BUILD_CORES}} \
$makeFlags "${makeFlagsArray[@]}" \
$buildFlags "${buildFlagsArray[@]}"
runHook postBuild
}
checkPhase() {
runHook preCheck
echo "check flags: $makeFlags ${makeFlagsArray[@]} $checkFlags ${checkFlagsArray[@]}"
make ${makefile:+-f $makefile} \
${enableParallelBuilding:+-j${NIX_BUILD_CORES} -l${NIX_BUILD_CORES}} \
$makeFlags "${makeFlagsArray[@]}" \
${checkFlags:-VERBOSE=y} "${checkFlagsArray[@]}" ${checkTarget:-check}
runHook postCheck
}
patchELF() {
# Patch all ELF executables and shared libraries.
header "patching ELF executables and libraries"
if [ -e "$prefix" ]; then
find "$prefix" \( \
\( -type f -a -name "*.so*" \) -o \
\( -type f -a -perm +0100 \) \
\) -print -exec patchelf --shrink-rpath '{}' \;
fi
stopNest
}
patchShebangs() {
# Rewrite all script interpreter file names (`#! /path') under the
# specified directory tree to paths found in $PATH. E.g.,
# /bin/sh will be rewritten to /nix/store/<hash>-some-bash/bin/sh.
# /usr/bin/env gets special treatment so that ".../bin/env python" is
# rewritten to /nix/store/<hash>/bin/python.
# Interpreters that are already in the store are left untouched.
header "patching script interpreter paths"
local dir="$1"
local f
local oldPath
local newPath
local arg0
local args
local oldInterpreterLine
local newInterpreterLine
for f in $(find "$dir" -type f -perm +0100); do
if [ "$(head -1 "$f" | head -c +2)" != '#!' ]; then
# missing shebang => not a script
continue
fi
oldInterpreterLine=$(head -1 "$f" | tail -c +3)
read oldPath arg0 args <<< "$oldInterpreterLine"
if $(echo "$oldPath" | grep -q "/bin/env$"); then
# Check for unsupported 'env' functionality:
# - options: something starting with a '-'
# - environment variables: foo=bar
if $(echo "$arg0" | grep -q -- "^-.*\|.*=.*"); then
echo "unsupported interpreter directive \"$oldInterpreterLine\" (set dontPatchShebangs=1 and handle shebang patching yourself)"
exit 1
fi
newPath="$(command -v "$arg0" || true)"
else
if [ "$oldPath" = "" ]; then
# If no interpreter is specified linux will use /bin/sh. Set
# oldpath="/bin/sh" so that we get /nix/store/.../sh.
oldPath="/bin/sh"
fi
newPath="$(command -v "$(basename "$oldPath")" || true)"
args="$arg0 $args"
fi
newInterpreterLine="$newPath $args"
if [ -n "$oldPath" -a "${oldPath:0:${#NIX_STORE}}" != "$NIX_STORE" ]; then
if [ -n "$newPath" -a "$newPath" != "$oldPath" ]; then
echo "$f: interpreter directive changed from \"$oldInterpreterLine\" to \"$newInterpreterLine\""
sed -i -e "1 s|.*|#\!$newInterpreterLine|" "$f"
fi
fi
done
stopNest
}
installPhase() {
runHook preInstall
mkdir -p "$prefix"
installTargets=${installTargets:-install}
echo "install flags: $installTargets $makeFlags ${makeFlagsArray[@]} $installFlags ${installFlagsArray[@]}"
make ${makefile:+-f $makefile} $installTargets \
$makeFlags "${makeFlagsArray[@]}" \
$installFlags "${installFlagsArray[@]}"
runHook postInstall
}
# The fixup phase performs generic, package-independent, Nix-related
# stuff, like running patchelf and setting the
# propagated-build-inputs. It should rarely be overriden.
fixupPhase() {
runHook preFixup
# Put man/doc/info under $out/share.
forceShare=${forceShare:=man doc info}
if [ -n "$forceShare" ]; then
for d in $forceShare; do
if [ -d "$prefix/$d" ]; then
if [ -d "$prefix/share/$d" ]; then
echo "both $d/ and share/$d/ exists!"
else
echo "fixing location of $d/ subdirectory"
mkdir -p $prefix/share
if [ -w $prefix/share ]; then
mv -v $prefix/$d $prefix/share
ln -sv share/$d $prefix
fi
fi
fi
done;
fi
if [ -z "$dontGzipMan" ]; then
echo "gzipping man pages"
GLOBIGNORE=.:..:*.gz:*.bz2
for f in "$out"/share/man/*/* "$out"/share/man/*/*/*; do
if [ -f "$f" -a ! -L "$f" ]; then
if gzip -c "$f" > "$f".gz; then
rm "$f"
else
rm "$f".gz
fi
fi
done
for f in "$out"/share/man/*/* "$out"/share/man/*/*/*; do
if [ -L "$f" -a -f `readlink -f "$f"`.gz ]; then
ln -sf `readlink "$f"`.gz "$f"
fi
done
unset GLOBIGNORE
fi
# TODO: strip _only_ ELF executables, and return || fail here...
if [ -z "$dontStrip" ]; then
stripDebugList=${stripDebugList:-lib lib32 lib64 libexec bin sbin}
if [ -n "$stripDebugList" ]; then
stripDirs "$stripDebugList" "${stripDebugFlags:--S}"
fi
stripAllList=${stripAllList:-}
if [ -n "$stripAllList" ]; then
stripDirs "$stripAllList" "${stripAllFlags:--s}"
fi
fi
if [ "$havePatchELF" = 1 -a -z "$dontPatchELF" ]; then
patchELF "$prefix"
fi
if [ -z "$dontPatchShebangs" ]; then
patchShebangs "$prefix"
fi
if [ -n "$propagatedBuildInputs" ]; then
mkdir -p "$prefix/nix-support"
echo "$propagatedBuildInputs" > "$prefix/nix-support/propagated-build-inputs"
fi
if [ -n "$propagatedNativeBuildInputs" ]; then
mkdir -p "$prefix/nix-support"
echo "$propagatedNativeBuildInputs" > "$prefix/nix-support/propagated-native-build-inputs"
fi
if [ -n "$propagatedUserEnvPkgs" ]; then
mkdir -p "$prefix/nix-support"
echo "$propagatedUserEnvPkgs" > "$prefix/nix-support/propagated-user-env-packages"
fi
if [ -n "$setupHook" ]; then
mkdir -p "$prefix/nix-support"
substituteAll "$setupHook" "$prefix/nix-support/setup-hook"
fi
runHook postFixup
}
installCheckPhase() {
runHook preInstallCheck
echo "installcheck flags: $makeFlags ${makeFlagsArray[@]} $installCheckFlags ${installCheckFlagsArray[@]}"
make ${makefile:+-f $makefile} \
${enableParallelBuilding:+-j${NIX_BUILD_CORES} -l${NIX_BUILD_CORES}} \
$makeFlags "${makeFlagsArray[@]}" \
$installCheckFlags "${installCheckFlagsArray[@]}" ${installCheckTarget:-installcheck}
runHook postInstallCheck
}
distPhase() {
runHook preDist
echo "dist flags: $distFlags ${distFlagsArray[@]}"
make ${makefile:+-f $makefile} $distFlags "${distFlagsArray[@]}" ${distTarget:-dist}
if [ "$dontCopyDist" != 1 ]; then
mkdir -p "$out/tarballs"
# Note: don't quote $tarballs, since we explicitly permit
# wildcards in there.
cp -pvd ${tarballs:-*.tar.gz} $out/tarballs
fi
runHook postDist
}
showPhaseHeader() {
local phase="$1"
case $phase in
unpackPhase) header "unpacking sources";;
patchPhase) header "patching sources";;
configurePhase) header "configuring";;
buildPhase) header "building";;
checkPhase) header "running tests";;
installPhase) header "installing";;
fixupPhase) header "post-installation fixup";;
installCheckPhase) header "running install tests";;
*) header "$phase";;
esac
}
genericBuild() {
header "building $out"
if [ -n "$buildCommand" ]; then
eval "$buildCommand"
return
fi
if [ -z "$phases" ]; then
phases="$prePhases unpackPhase patchPhase $preConfigurePhases \
configurePhase $preBuildPhases buildPhase checkPhase \
$preInstallPhases installPhase fixupPhase installCheckPhase \
$preDistPhases distPhase $postPhases";
fi
for curPhase in $phases; do
if [ "$curPhase" = buildPhase -a -n "$dontBuild" ]; then continue; fi
if [ "$curPhase" = checkPhase -a -z "$doCheck" ]; then continue; fi
if [ "$curPhase" = installPhase -a -n "$dontInstall" ]; then continue; fi
if [ "$curPhase" = fixupPhase -a -n "$dontFixup" ]; then continue; fi
if [ "$curPhase" = installCheckPhase -a -z "$doInstallCheck" ]; then continue; fi
if [ "$curPhase" = distPhase -a -z "$doDist" ]; then continue; fi
if [ -n "$tracePhases" ]; then
echo
echo "@ phase-started $out $curPhase"
fi
showPhaseHeader "$curPhase"
dumpVars
if [ "$curPhase" = fixupPhase ]; then
for pref in ${outputs:-out}; do
echo "fixup on \$$pref"
prefix=${!pref} eval "${!curPhase:-$curPhase}"
done
else
# Evaluate the variable named $curPhase if it exists, otherwise the
# function named $curPhase.
eval "${!curPhase:-$curPhase}"
fi
if [ "$curPhase" = unpackPhase ]; then
cd "${sourceRoot:-.}"
fi
if [ -n "$tracePhases" ]; then
echo
echo "@ phase-succeeded $out $curPhase"
fi
stopNest
done
stopNest
}
for i in "${postHooks[@]}"; do
$i
done
# Execute the post-hook.
runHook postHook
# Execute the global user hook (defined through the Nixpkgs
# configuration option stdenv.userHook). This can be used to set
# global compiler optimisation flags, for instance.
runHook userHook
dumpVars