Merge pull request #28557 from obsidiansystems/binutils-wrapper
Binutils-wrapper: Init by refactoring out of cc-wrapperwip/yesman
John Ericson
7 years ago
committed by
GitHub
commit
0a944b345e
@ -0,0 +1,40 @@ |
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# See cc-wrapper for comments. |
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var_templates_list=( |
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NIX+IGNORE_LD_THROUGH_GCC |
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NIX+LDFLAGS |
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NIX+LDFLAGS_BEFORE |
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NIX+LDFLAGS_AFTER |
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NIX+LDFLAGS_HARDEN |
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) |
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var_templates_bool=( |
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NIX+SET_BUILD_ID |
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NIX+DONT_SET_RPATH |
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) |
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|
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declare -a role_infixes=() |
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if [ "${NIX_BINUTILS_WRAPPER_@infixSalt@_TARGET_BUILD:-}" ]; then |
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role_infixes+=(_BUILD_) |
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fi |
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if [ "${NIX_BINUTILS_WRAPPER_@infixSalt@_TARGET_HOST:-}" ]; then |
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role_infixes+=(_) |
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fi |
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if [ "${NIX_BINUTILS_WRAPPER_@infixSalt@_TARGET_TARGET:-}" ]; then |
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role_infixes+=(_TARGET_) |
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fi |
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|
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for var in "${var_templates_list[@]}"; do |
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mangleVarList "$var" "${role_infixes[@]}" |
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done |
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for var in "${var_templates_bool[@]}"; do |
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mangleVarBool "$var" "${role_infixes[@]}" |
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done |
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|
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if [ -e @out@/nix-support/libc-ldflags ]; then |
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NIX_@infixSalt@_LDFLAGS+=" $(< @out@/nix-support/libc-ldflags)" |
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fi |
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|
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if [ -e @out@/nix-support/libc-ldflags-before ]; then |
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NIX_@infixSalt@_LDFLAGS_BEFORE="$(< @out@/nix-support/libc-ldflags-before) $NIX_@infixSalt@_LDFLAGS_BEFORE" |
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fi |
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|
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export NIX_BINUTILS_WRAPPER_@infixSalt@_FLAGS_SET=1 |
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@ -0,0 +1,53 @@ |
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hardeningFlags=(relro bindnow) |
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# Intentionally word-split in case 'hardeningEnable' is defined in |
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# Nix. Also, our bootstrap tools version of bash is old enough that |
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# undefined arrays trip `set -u`. |
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if [[ -v hardeningEnable[@] ]]; then |
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hardeningFlags+=(${hardeningEnable[@]}) |
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fi |
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hardeningLDFlags=() |
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|
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declare -A hardeningDisableMap |
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|
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# Intentionally word-split in case 'hardeningDisable' is defined in Nix. |
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for flag in ${hardeningDisable[@]:-IGNORED_KEY} @hardening_unsupported_flags@ |
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do |
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hardeningDisableMap[$flag]=1 |
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done |
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|
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if [[ -n "${NIX_DEBUG:-}" ]]; then |
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printf 'HARDENING: disabled flags:' >&2 |
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(( "${#hardeningDisableMap[@]}" )) && printf ' %q' "${!hardeningDisableMap[@]}" >&2 |
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echo >&2 |
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fi |
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|
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if [[ -z "${hardeningDisableMap[all]:-}" ]]; then |
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if [[ -n "${NIX_DEBUG:-}" ]]; then |
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echo 'HARDENING: Is active (not completely disabled with "all" flag)' >&2; |
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fi |
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for flag in "${hardeningFlags[@]}" |
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do |
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if [[ -z "${hardeningDisableMap[$flag]:-}" ]]; then |
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case $flag in |
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pie) |
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if [[ ! ("$*" =~ " -shared " || "$*" =~ " -static ") ]]; then |
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling LDFlags -pie >&2; fi |
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hardeningLDFlags+=('-pie') |
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fi |
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;; |
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relro) |
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling relro >&2; fi |
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hardeningLDFlags+=('-z' 'relro') |
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;; |
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bindnow) |
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling bindnow >&2; fi |
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hardeningLDFlags+=('-z' 'now') |
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;; |
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*) |
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# Ignore unsupported. Checked in Nix that at least *some* |
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# tool supports each flag. |
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;; |
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esac |
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fi |
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done |
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fi |
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@ -0,0 +1,288 @@ |
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# The Nixpkgs CC is not directly usable, since it doesn't know where |
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# the C library and standard header files are. Therefore the compiler |
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# produced by that package cannot be installed directly in a user |
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# environment and used from the command line. So we use a wrapper |
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# script that sets up the right environment variables so that the |
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# compiler and the linker just "work". |
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|
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{ name ? "", stdenv, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? "" |
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, binutils ? null, libc ? null |
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, coreutils ? null, shell ? stdenv.shell, gnugrep ? null |
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, extraPackages ? [], extraBuildCommands ? "" |
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, buildPackages ? {} |
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, useMacosReexportHack ? false |
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}: |
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|
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with stdenv.lib; |
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|
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assert nativeTools -> nativePrefix != ""; |
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assert !nativeTools -> |
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binutils != null && coreutils != null && gnugrep != null; |
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assert !(nativeLibc && noLibc); |
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assert (noLibc || nativeLibc) == (libc == null); |
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|
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let |
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inherit (stdenv) hostPlatform targetPlatform; |
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|
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# Prefix for binaries. Customarily ends with a dash separator. |
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# |
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# TODO(@Ericson2314) Make unconditional, or optional but always true by |
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# default. |
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prefix = stdenv.lib.optionalString (targetPlatform != hostPlatform) |
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(targetPlatform.config + "-"); |
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|
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binutilsVersion = (builtins.parseDrvName binutils.name).version; |
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binutilsName = (builtins.parseDrvName binutils.name).name; |
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|
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libc_bin = if libc == null then null else getBin libc; |
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libc_dev = if libc == null then null else getDev libc; |
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libc_lib = if libc == null then null else getLib libc; |
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binutils_bin = if nativeTools then "" else getBin binutils; |
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# The wrapper scripts use 'cat' and 'grep', so we may need coreutils. |
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coreutils_bin = if nativeTools then "" else getBin coreutils; |
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|
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dashlessTarget = stdenv.lib.replaceStrings ["-"] ["_"] targetPlatform.config; |
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|
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# See description in cc-wrapper. |
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infixSalt = dashlessTarget; |
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|
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# The dynamic linker has different names on different platforms. This is a |
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# shell glob that ought to match it. |
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dynamicLinker = |
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/**/ if libc == null then null |
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else if targetPlatform.system == "i686-linux" then "${libc_lib}/lib/ld-linux.so.2" |
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else if targetPlatform.system == "x86_64-linux" then "${libc_lib}/lib/ld-linux-x86-64.so.2" |
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# ARM with a wildcard, which can be "" or "-armhf". |
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else if targetPlatform.isArm then "${libc_lib}/lib/ld-linux*.so.3" |
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else if targetPlatform.system == "aarch64-linux" then "${libc_lib}/lib/ld-linux-aarch64.so.1" |
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else if targetPlatform.system == "powerpc-linux" then "${libc_lib}/lib/ld.so.1" |
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else if targetPlatform.system == "mips64el-linux" then "${libc_lib}/lib/ld.so.1" |
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else if targetPlatform.system == "x86_64-darwin" then "/usr/lib/dyld" |
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else if stdenv.lib.hasSuffix "pc-gnu" targetPlatform.config then "ld.so.1" |
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else null; |
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|
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expand-response-params = |
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if buildPackages.stdenv.cc or null != null && buildPackages.stdenv.cc != "/dev/null" |
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then import ../expand-response-params { inherit (buildPackages) stdenv; } |
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else ""; |
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|
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in |
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|
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stdenv.mkDerivation { |
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name = prefix |
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+ (if name != "" then name else "${binutilsName}-wrapper") |
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+ (stdenv.lib.optionalString (binutils != null && binutilsVersion != "") "-${binutilsVersion}"); |
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|
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preferLocalBuild = true; |
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|
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inherit binutils_bin shell libc_bin libc_dev libc_lib coreutils_bin; |
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gnugrep_bin = if nativeTools then "" else gnugrep; |
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|
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binPrefix = prefix; |
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inherit infixSalt; |
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|
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outputs = [ "out" "man" ]; |
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|
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passthru = { |
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inherit binutils libc nativeTools nativeLibc nativePrefix prefix; |
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|
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emacsBufferSetup = pkgs: '' |
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; We should handle propagation here too |
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(mapc |
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(lambda (arg) |
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(when (file-directory-p (concat arg "/lib")) |
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(setenv "NIX_${infixSalt}_LDFLAGS" (concat (getenv "NIX_${infixSalt}_LDFLAGS") " -L" arg "/lib"))) |
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(when (file-directory-p (concat arg "/lib64")) |
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(setenv "NIX_${infixSalt}_LDFLAGS" (concat (getenv "NIX_${infixSalt}_LDFLAGS") " -L" arg "/lib64")))) |
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'(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)})) |
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''; |
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}; |
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|
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dontBuild = true; |
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dontConfigure = true; |
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|
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unpackPhase = '' |
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src=$PWD |
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''; |
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|
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installPhase = |
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'' |
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set -u |
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|
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mkdir -p $out/bin $out/nix-support $man/nix-support |
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|
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wrap() { |
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local dst="$1" |
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local wrapper="$2" |
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export prog="$3" |
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set +u |
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substituteAll "$wrapper" "$out/bin/$dst" |
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set -u |
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chmod +x "$out/bin/$dst" |
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} |
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'' |
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|
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+ (if nativeTools then '' |
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echo ${nativePrefix} > $out/nix-support/orig-binutils |
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|
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ldPath="${nativePrefix}/bin" |
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'' else '' |
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echo $binutils_bin > $out/nix-support/orig-binutils |
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|
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ldPath="${binutils_bin}/bin" |
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'' |
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|
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+ optionalString (targetPlatform.isSunOS && nativePrefix != "") '' |
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# Solaris needs an additional ld wrapper. |
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ldPath="${nativePrefix}/bin" |
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exec="$ldPath/${prefix}ld" |
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wrap ld-solaris ${./ld-solaris-wrapper.sh} |
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'') |
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|
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+ '' |
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# Create a symlink to as (the assembler). |
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if [ -e $ldPath/${prefix}as ]; then |
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ln -s $ldPath/${prefix}as $out/bin/${prefix}as |
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fi |
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|
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'' + (if !useMacosReexportHack then '' |
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wrap ${prefix}ld ${./ld-wrapper.sh} ''${ld:-$ldPath/${prefix}ld} |
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'' else '' |
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ldInner="${prefix}ld-reexport-delegate" |
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wrap "$ldInner" ${./macos-sierra-reexport-hack.bash} ''${ld:-$ldPath/${prefix}ld} |
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wrap "${prefix}ld" ${./ld-wrapper.sh} "$out/bin/$ldInner" |
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unset ldInner |
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'') + '' |
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|
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if [ -e ${binutils_bin}/bin/${prefix}ld.gold ]; then |
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wrap ${prefix}ld.gold ${./ld-wrapper.sh} ${binutils_bin}/bin/${prefix}ld.gold |
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fi |
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|
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if [ -e ${binutils_bin}/bin/ld.bfd ]; then |
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wrap ${prefix}ld.bfd ${./ld-wrapper.sh} ${binutils_bin}/bin/${prefix}ld.bfd |
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fi |
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|
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set +u |
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''; |
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|
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propagatedBuildInputs = extraPackages; |
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|
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setupHook = ./setup-hook.sh; |
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|
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postFixup = |
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'' |
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set -u |
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'' |
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|
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+ optionalString (libc != null) ('' |
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## |
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## General libc support |
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## |
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|
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echo "-L${libc_lib}/lib" > $out/nix-support/libc-ldflags |
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|
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echo "${libc_lib}" > $out/nix-support/orig-libc |
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echo "${libc_dev}" > $out/nix-support/orig-libc-dev |
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|
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## |
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## Dynamic linker support |
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## |
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|
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if [[ -z ''${dynamicLinker+x} ]]; then |
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echo "Don't know the name of the dynamic linker for platform '${targetPlatform.config}', so guessing instead." >&2 |
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local dynamicLinker="${libc_lib}/lib/ld*.so.?" |
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fi |
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|
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# Expand globs to fill array of options |
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dynamicLinker=($dynamicLinker) |
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|
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case ''${#dynamicLinker[@]} in |
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0) echo "No dynamic linker found for platform '${targetPlatform.config}'." >&2;; |
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1) echo "Using dynamic linker: '$dynamicLinker'" >&2;; |
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*) echo "Multiple dynamic linkers found for platform '${targetPlatform.config}'." >&2;; |
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esac |
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|
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if [ -n "$dynamicLinker" ]; then |
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echo $dynamicLinker > $out/nix-support/dynamic-linker |
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|
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'' + (if targetPlatform.isDarwin then '' |
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printf "export LD_DYLD_PATH=%q\n" "$dynamicLinker" >> $out/nix-support/setup-hook |
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'' else '' |
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if [ -e ${libc_lib}/lib/32/ld-linux.so.2 ]; then |
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echo ${libc_lib}/lib/32/ld-linux.so.2 > $out/nix-support/dynamic-linker-m32 |
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fi |
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|
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local ldflagsBefore=(-dynamic-linker "$dynamicLinker") |
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'') + '' |
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fi |
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|
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# The dynamic linker is passed in `ldflagsBefore' to allow |
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# explicit overrides of the dynamic linker by callers to ld |
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# (the *last* value counts, so ours should come first). |
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printWords "''${ldflagsBefore[@]}" > $out/nix-support/libc-ldflags-before |
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'') |
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|
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+ optionalString (!nativeTools) '' |
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|
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## |
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## User env support |
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## |
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|
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# Propagate the underling unwrapped binutils so that if you |
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# install the wrapper, you get tools like objdump, the manpages, |
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# etc. as well (same for any binaries of libc). |
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printWords ${binutils_bin} ${if libc == null then "" else libc_bin} > $out/nix-support/propagated-user-env-packages |
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'' |
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|
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+ '' |
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|
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## |
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## Hardening support |
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## |
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|
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# some linkers on some platforms don't support specific -z flags |
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export hardening_unsupported_flags="" |
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if [[ "$($ldPath/${prefix}ld -z now 2>&1 || true)" =~ un(recognized|known)\ option ]]; then |
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hardening_unsupported_flags+=" bindnow" |
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fi |
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if [[ "$($ldPath/${prefix}ld -z relro 2>&1 || true)" =~ un(recognized|known)\ option ]]; then |
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hardening_unsupported_flags+=" relro" |
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fi |
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'' |
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|
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+ optionalString hostPlatform.isCygwin '' |
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hardening_unsupported_flags+=" pic" |
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'' |
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|
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+ '' |
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set +u |
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substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh |
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substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh |
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substituteAll ${../cc-wrapper/utils.sh} $out/nix-support/utils.sh |
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|
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## |
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## Extra custom steps |
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## |
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|
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'' |
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+ extraBuildCommands; |
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|
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inherit dynamicLinker expand-response-params; |
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|
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# for substitution in utils.sh |
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expandResponseParams = "${expand-response-params}/bin/expand-response-params"; |
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|
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crossAttrs = { |
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shell = shell.crossDrv + shell.crossDrv.shellPath; |
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}; |
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|
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meta = |
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let binutils_ = if binutils != null then binutils else {}; in |
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(if binutils_ ? meta then removeAttrs binutils.meta ["priority"] else {}) // |
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{ description = |
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stdenv.lib.attrByPath ["meta" "description"] "System binary utilities" binutils_ |
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+ " (wrapper script)"; |
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} // optionalAttrs useMacosReexportHack { |
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platforms = stdenv.lib.platforms.darwin; |
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}; |
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} |
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@ -0,0 +1,63 @@ |
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# Binutils Wrapper hygiene |
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# |
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# See comments in cc-wrapper's setup hook. This works exactly the same way. |
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|
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binutilsWrapper_addLDVars () { |
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case $depOffset in |
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-1) local role='BUILD_' ;; |
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0) local role='' ;; |
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1) local role='TARGET_' ;; |
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*) echo "binutils-wrapper: Error: Cannot be used with $depOffset-offset deps, " >2; |
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return 1 ;; |
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esac |
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|
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if [[ -d "$1/lib64" && ! -L "$1/lib64" ]]; then |
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export NIX_${role}LDFLAGS+=" -L$1/lib64" |
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fi |
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|
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if [[ -d "$1/lib" ]]; then |
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export NIX_${role}LDFLAGS+=" -L$1/lib" |
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fi |
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} |
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|
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if [ -n "${crossConfig:-}" ]; then |
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export NIX_BINUTILS_WRAPPER_@infixSalt@_TARGET_BUILD=1 |
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role="BUILD_" |
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else |
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export NIX_BINUTILS_WRAPPER_@infixSalt@_TARGET_HOST=1 |
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role="" |
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fi |
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|
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envHooks+=(binutilsWrapper_addLDVars) |
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|
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# shellcheck disable=SC2157 |
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if [ -n "@binutils_bin@" ]; then |
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addToSearchPath _PATH @binutils_bin@/bin |
||||
fi |
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|
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# shellcheck disable=SC2157 |
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if [ -n "@libc_bin@" ]; then |
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addToSearchPath _PATH @libc_bin@/bin |
||||
fi |
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|
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# shellcheck disable=SC2157 |
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if [ -n "@coreutils_bin@" ]; then |
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addToSearchPath _PATH @coreutils_bin@/bin |
||||
fi |
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|
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# Export tool environment variables so various build systems use the right ones. |
||||
|
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export NIX_${role}BINUTILS=@out@ |
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|
||||
for CMD in \ |
||||
ar as nm objcopy ranlib strip strings size ld windres |
||||
do |
||||
if |
||||
PATH=$_PATH type -p "@binPrefix@$CMD" > /dev/null |
||||
then |
||||
export "${role}$(echo "$CMD" | tr "[:lower:]" "[:upper:]")=@binPrefix@${CMD}"; |
||||
fi |
||||
done |
||||
|
||||
# No local scope in sourced file |
||||
unset role |
||||
@ -1,106 +0,0 @@ |
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#! @shell@ |
||||
|
||||
set -eu -o pipefail |
||||
|
||||
path_backup="$PATH" |
||||
if [ -n "@coreutils_bin@" ]; then |
||||
PATH="@coreutils_bin@/bin" |
||||
fi |
||||
|
||||
declare -r recurThreshold=300 |
||||
|
||||
declare overflowCount=0 |
||||
for ((n=0; n < $#; ++n)); do |
||||
case "${!n}" in |
||||
-l*) let overflowCount+=1 ;; |
||||
-reexport-l*) let overflowCount+=1 ;; |
||||
*) ;; |
||||
esac |
||||
done |
||||
|
||||
declare -a allArgs=() |
||||
|
||||
if (( "$overflowCount" <= "$recurThreshold" )); then |
||||
allArgs=("$@") |
||||
else |
||||
declare -a childrenLookup=() childrenLink=() |
||||
|
||||
while (( $# )); do |
||||
case "$1" in |
||||
-L/*) |
||||
childrenLookup+=("$1") |
||||
allArgs+=("$1") |
||||
;; |
||||
-L) |
||||
echo "cctools LD does not support '-L foo' or '-l foo'" >&2 |
||||
exit 1 |
||||
;; |
||||
-l) |
||||
echo "cctools LD does not support '-L foo' or '-l foo'" >&2 |
||||
exit 1 |
||||
;; |
||||
-lazy_library | -lazy_framework | -lto_library) |
||||
# We aren't linking any "azy_library", "to_library", etc. |
||||
allArgs+=("$1") |
||||
;; |
||||
-lazy-l | -weak-l) allArgs+=("$1") ;; |
||||
# We can't so easily prevent header issues from these. |
||||
-lSystem) allArgs+=("$1") ;; |
||||
# Special case as indirection seems like a bad idea for something |
||||
# so fundamental. Can be removed for simplicity. |
||||
-l?* | -reexport-l?*) childrenLink+=("$1") ;; |
||||
*) allArgs+=("$1") ;; |
||||
esac |
||||
|
||||
shift |
||||
done |
||||
|
||||
declare n=0 |
||||
while (( $n < "${#childrenLink[@]}" )); do |
||||
if [[ "${childrenLink[n]}" = -l* ]]; then |
||||
childrenLink[n]="-reexport${childrenLink[n]}" |
||||
fi |
||||
let ++n |
||||
done |
||||
unset n |
||||
|
||||
declare -r outputNameLibless=$(basename $( \ |
||||
if [[ -z "${outputName:+isUndefined}" ]]; then |
||||
echo unnamed |
||||
elif [[ "${outputName:0:3}" = lib ]]; then |
||||
echo "${outputName:3}" |
||||
else |
||||
echo "${outputName}" |
||||
fi)) |
||||
declare -ra children=("$outputNameLibless-reexport-delegate-0" \ |
||||
"$outputNameLibless-reexport-delegate-1") |
||||
|
||||
mkdir -p "$out/lib" |
||||
|
||||
PATH="$PATH:@out@/bin" |
||||
|
||||
symbolBloatObject=$outputNameLibless-symbol-hack.o |
||||
if [[ ! -e $symbolBloatObject ]]; then |
||||
printf '.private_extern _______child_hack_foo\nchild_hack_foo:\n' \ |
||||
| @binPrefix@as -- -o $symbolBloatObject |
||||
fi |
||||
|
||||
# first half of libs |
||||
@binPrefix@ld -macosx_version_min $MACOSX_DEPLOYMENT_TARGET -arch x86_64 -dylib \ |
||||
-o "$out/lib/lib${children[0]}.dylib" \ |
||||
-install_name "$out/lib/lib${children[0]}.dylib" \ |
||||
"${childrenLookup[@]}" "$symbolBloatObject" \ |
||||
"${childrenLink[@]:0:$((${#childrenLink[@]} / 2 ))}" |
||||
|
||||
# second half of libs |
||||
@binPrefix@ld -macosx_version_min $MACOSX_DEPLOYMENT_TARGET -arch x86_64 -dylib \ |
||||
-o "$out/lib/lib${children[1]}.dylib" \ |
||||
-install_name "$out/lib/lib${children[1]}.dylib" \ |
||||
"${childrenLookup[@]}" "$symbolBloatObject" \ |
||||
"${childrenLink[@]:$((${#childrenLink[@]} / 2 ))}" |
||||
|
||||
allArgs+=("-L$out/lib" "-l${children[0]}" "-l${children[1]}") |
||||
fi |
||||
|
||||
PATH="$path_backup" |
||||
exec @prog@ "${allArgs[@]}" |
||||
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Reference in new issue