reworked LTO to have no-lto package, gcc defaults to gnu-ld, clang defaults to lld now

env/clang

@@ -1,4 +1,5 @@
-COMMON_FLAGS="-O2 -pipe -march=native"
+COMMON_FLAGS="-O2 -pipe -march=native -flto=full"
+
 CFLAGS="${COMMON_FLAGS}"
 CXXFLAGS="${COMMON_FLAGS}"
 FCFLAGS="${COMMON_FLAGS}"
@@ -8,9 +9,19 @@ CC="clang"
 CXX="clang++"
 
 AR="llvm-ar"
+AS="clang -c"
+CPP="clang-cpp"
 NM="llvm-nm"
+STRIP="llvm-strip"
 RANLIB="llvm-ranlib"
+OBJCOPY="llvm-objcopy"
+STRINGS="llvm-strings"
+OBJDUMP="llvm-objdump"
+READELF="llvm-readelf"
+ADDR2LINE="llvm-addr2line"
 
-LDFLAGS="-Wl,--as-needed -rtlib=compiler-rt -unwindlib=libunwind"
+LD="ld.lld"
+
+LDFLAGS="-Wl,--as-needed -rtlib=compiler-rt -unwindlib=libunwind -fuse-ld=lld -flto"
 
 USE="clang llvm-libunwind"

env/gcc

@@ -1,4 +1,4 @@
-COMMON_FLAGS="-O2 -pipe -march=native"
+COMMON_FLAGS="-O2 -pipe -march=native -flto=auto"
 
 CFLAGS="${COMMON_FLAGS}"
 CXXFLAGS="${COMMON_FLAGS}"
@@ -11,7 +11,7 @@ CXX="g++"
 
 LD="ld"
 
-LDFLAGS="-Wl,--as-needed"
+LDFLAGS="-Wl,--as-needed -flto"
 
 AR="ar"
 AS="as"

env/lto

@@ -1,6 +0,0 @@
-CFLAGS="${CFLAGS} -flto"
-CXXFLAGS="${CXXFLAGS} -flto"
-
-LDFLAGS="${LDFLAGS} -flto"
-
-USE="lto"

env/no-lto

@@ -0,0 +1,7 @@
+CFLAGS="${CFLAGS} -fno-lto"
+CXXFLAGS="${CXXFLAGS} -fno-lto"
+
+FCFLAGS="${FCFLAGS} -fno-lto"
+FFLAGS="${FFLAGS} -fno-lto"
+
+LDFLAGS="${LDFLAGS} -fno-lto"

make.conf/00common

@@ -1,4 +1,4 @@
-COMMON_FLAGS="-O2 -pipe -march=native -flto"
+COMMON_FLAGS="-O2 -pipe -march=native -flto=full"
 
 CFLAGS="${COMMON_FLAGS}"
 CXXFLAGS="${COMMON_FLAGS}"
@@ -11,10 +11,6 @@ RUSTFLAGS="-C target-cpu=native -C opt-level=3 -C linker=clang -C link-arg=-fuse
 CC="clang"
 CXX="clang++"
 
-LD="ld.mold"
-
-LDFLAGS="${LDFLAGS} -fuse-ld=mold -rtlib=compiler-rt -unwindlib=libunwind -Wl,--as-needed -flto"
-
 AR="llvm-ar"
 AS="clang -c"
 CPP="clang-cpp"
@@ -27,11 +23,12 @@ OBJDUMP="llvm-objdump"
 READELF="llvm-readelf"
 ADDR2LINE="llvm-addr2line"
 
-# don't strip comment section of binaries
-# assumes STRIP will be gnu-strip
-PORTAGE_STRIP_FLAGS="--strip-unneeded -N __gentoo_check_ldflags__ -R .GCC.command.line -R .note.gnu.gold-version"
+LD="ld.mold"
 
-# EMERGE_DEFAULT_OPTS="--jobs 2"
+LDFLAGS="${LDFLAGS} -fuse-ld=mold -rtlib=compiler-rt -unwindlib=libunwind -Wl,--as-needed -flto"
+
+# don't strip comment section of binaries
+PORTAGE_STRIP_FLAGS="--strip-unneeded -N __gentoo_check_ldflags__ -R .GCC.command.line -R .note.gnu.gold-version"
 
 USE="clang dist-kernel llvm-libunwind lto pulseaudio X -systemd -wayland"
 

package.env/ccache

@@ -9,3 +9,7 @@ media-libs/mesa ccache
 
 www-client/firefox ccache
 mail-client/thunderbird ccache
+
+www-client/chromium
+
+net-libs/nodejs

package.env/chromium

@@ -0,0 +1 @@
+# www-client/chromium clang lld

package.env/ghc

@@ -1,2 +1,2 @@
-dev-lang/ghc gcc mold
-app-admin/haskell-updater gcc lto mold
+dev-lang/ghc gcc mold no-lto
+app-admin/haskell-updater gcc mold

package.env/libtomcrypt

@@ -1 +1 @@
-dev-libs/libtomcrypt clang mold
+dev-libs/libtomcrypt clang mold no-lto

package.env/qt

@@ -1 +1 @@
-dev-qt/qtcore clang mold
+dev-qt/qtcore clang mold no-lto

package.env/sys

@@ -1,4 +1,4 @@
-sys-kernel/* clang lld
+sys-kernel/* clang lld no-lto
 
-sys-libs/efivar gcc mold
-sys-libs/glibc gcc lto mold
+sys-libs/efivar gcc mold no-lto
+sys-libs/glibc gcc lto mold no-lto

package.use/chromium

@@ -0,0 +1,9 @@
+# required by www-client/chromium-116.0.5845.96::gentoo
+# required by www-client/chromium (argument)
+>=sys-libs/zlib-1.2.13-r1 minizip
+
+# required by www-client/chromium-116.0.5845.96::gentoo
+# required by www-client/chromium (argument)
+>=net-libs/nodejs-20.5.1 inspector
+
+www-client/chromium custom-cflags

package.use/clang

@@ -1,2 +1,2 @@
-sys-devel/clang-common default-compiler-rt llvm-libunwind
+sys-devel/clang-common default-compiler-rt default-lld llvm-libunwind
 sys-libs/llvm-libunwind static-libs