norm_common.prefix

#!/bin/bash

DEFAULT_PREFIX="$HOME/norm.$MACHINEID"

addpath() {
    [ -z "$1" -o -z "$2" ] && return
    local value VARNAME=$1
    shift
    for value; do
        [ -z "${!VARNAME}" ] && export $VARNAME="$value" && continue || true
        [[ ! "${!VARNAME}" =~ (^|:)$value(:|$) ]] && export $VARNAME="$value:${!VARNAME}" || true
    done
}

setup_prefix() {
    PREFIX="$1"
    DESTDIR="$PREFIX/tmp/stage"
    STAGE="$DESTDIR/$PREFIX"
    COMPILEDIR="$PREFIX/tmp/compile"

    printf -v ESCAPED_PREFIX "%q" "$PREFIX"

    ## default flags, if compiler doesn't support these, we can't operate
    default_ldflags="-L$ESCAPED_PREFIX/lib"
    default_cppflags="-I$ESCAPED_PREFIX/include"

    ## set compile flags
    cc_addflags LDFLAGS $default_ldflags
    cc_addflags CPPFLAGS $default_cppflags

    ## set optimization flags
    cc_addflags CFLAGS -g -O2 -O3 -Ofast
    cc_addflags CXXFLAGS -g -O2 -O3 -Ofast

    ## also try other flags if compiler supports them
    [[ $OSTYPE == *darwin* ]] && cc_addflags CPPFLAGS -fno-stack-check
    [[ $OSTYPE == *darwin* ]] && cc_addflags LDFLAGS -Wl,-rpath,$ESCAPED_PREFIX/lib -Wl,-x -Wl,-dead_strip -Wl,-dead_strip_dylibs
    [[ $OSTYPE == *linux* ]] && cc_addflags LDFLAGS -Wl,-rpath,$ESCAPED_PREFIX/lib -Wl,-rpath-link,$ESCAPED_PREFIX/lib -Wl,-O1 -Wl,--as-needed -Wl,--gc-sections -Wl,--relax
    [[ $OSTYPE == *darwin* ]] && export MACOSX_DEPLOYMENT_TARGET="$NORM_OSX_VERSION" ## needed for -rpath to work in CLT-only installs without xcode
    # [[ $OSTYPE == *darwin* ]] && cc_addflags CPPFLAGS -mmacosx-version-min="$NORM_OSX_VERSION" ## needed for -rpath to work in CLT-only installs without xcode
    is_cc_clang && cc_addflags CPPFLAGS -Qunused-arguments

    ## since we're building for this specific machine, we can do -march=native
    cc_addflags CPPFLAGS "-march=native"

    ## try to make reproducible builds by removing path-specific debug sections
    cc_addflags CPPFLAGS "-fdebug-prefix-map=$ESCAPED_PREFIX/tmp/compile=/build"

    ## let linker be more aggressive with removing unused functions and data
    cc_addflags CPPFLAGS -ffunction-sections -fdata-sections

    ## disable warnings as errors, apple clang v12 seems to default to -Werror=implicit-function-declaration
    ## caught when building pinentry 1.1.0
    cc_addflags CPPFLAGS -Wno-error=implicit-function-declaration
    ## clang 15, this breaks glib 2.58.2
    cc_addflags CPPFLAGS -Wno-error=int-conversion
    ## -Wnarrowing breaks gcc-9.1
    cc_addflags CPPFLAGS -Wno-error=narrowing

    ## set runtime flags
    addpath PATH "$PREFIX/bin" "$PREFIX/sbin" "$PREFIX/bin/ccache_wrap"
    addpath LD_RUN_PATH "$PREFIX/lib"
    addpath PKG_CONFIG_PATH "$PREFIX/share/pkgconfig" "$PREFIX/lib/pkgconfig"
    addpath PERL5LIB "$PREFIX/lib/perl5"

    ## create files if they don't exist
    [ ! -e "$PREFIX/bin" ] && mkdir -p "$PREFIX/bin" || true
    [ ! -e "$PREFIX/share/man" ] && mkdir -p "$PREFIX/share/man" || true
    [ ! -e "$PREFIX/share/pkgconfig" ] && mkdir -p "$PREFIX/share/pkgconfig" || true
    [ ! -e "$PREFIX/lib/pkgconfig" ] && mkdir -p "$PREFIX/lib/pkgconfig" || true
    [ ! -e "$PREFIX/man" ] && ln -s share/man $PREFIX/man || true
    [ ! -e "$PREFIX/include" ] && mkdir -p "$PREFIX/include" || true
    [ ! -e "$PREFIX/lib" ] && mkdir -p "$PREFIX/lib" || true
    [ ! -e "$PREFIX/lib64" ] && ln -s lib "$PREFIX/lib64" || true ## some packages insist on installing into lib64 when on 64-bit OS
    [ ! -e "$PREFIX/share/config.site" ] && generate_config_site || true
}

use_clang() {
    export CC=clang
    export CXX=clang++
}

generate_config_site() {
## generate config.site
mkdir -p $PREFIX/share
cat << EOF > $PREFIX/share/config.site
[ -z "\$CPPFLAGS" ] && CPPFLAGS="$default_cppflags"
[ -z "\$LDFLAGS" ] && LDFLAGS="$default_ldflags"
true
EOF
}