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config: add a knob to use the mold linker for packages 

Building it requires gcc >= 10.2 or clang >= 12.

Using sstrip with its -z argument can produce non-working binaries, like
a segfaulting `getrandom`, so don't allow that combination.

Signed-off-by: Andre Heider <a.heider@gmail.com>
This commit is contained in:
Andre Heider 2023-01-27 17:13:15 +01:00 committed by Christian Marangi
parent d026b19cdc
commit 65a716bb95
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2 changed files with 26 additions and 1 deletions
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15
config/Config-build.in
View File

@ -159,6 +159,19 @@ menu "Global build settings"
Adds LTO flags to the CFLAGS and LDFLAGS.
Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-lto
config MOLD
depends on (aarch64 || arm || i386 || i686 || m68k || powerpc || powerpc64 || sh4 || x86_64)
depends on !GCC_USE_VERSION_11
def_bool $(shell, ./config/check-hostcxx.sh 10 2 12)
config USE_MOLD
bool
prompt "Use the mold linker for all packages"
depends on MOLD
help
Link packages with mold, a modern linker
Packages can opt-out via setting PKG_BUILD_FLAGS:=no-mold
config IPV6
def_bool y
@ -200,7 +213,7 @@ menu "Global build settings"
config SSTRIP_DISCARD_TRAILING_ZEROES
bool "Strip trailing zero bytes"
depends on USE_SSTRIP
depends on USE_SSTRIP && !USE_MOLD
default y
help
Use sstrip's -z option to discard trailing zero bytes

12
config/check-hostcxx.sh Executable file
View File

@ -0,0 +1,12 @@
cat << EOF | "$STAGING_DIR_HOST/bin/g++" -c -x c++ -o /dev/null - >/dev/null 2>&1
#if __clang__
#if __clang_major__ < $3
#error "clang too old"
#endif
#else
#if __GNUC__ < $1 || (__GNUC__ == $1 && (__GNUC_MINOR__ < $2))
#error "gcc too old"
#endif
#endif
EOF
[ $? -eq 0 ] && echo y || echo n