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Fix build of older Glibc using GCC >=10

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Issue #1535

GCC 10 changed the default to -fno-common, which leads to a linking error in GLibc older than 2.30.

This change adds -fcommon cflag for the target GLibc versions <=2.29 and GCC >=10.

This change also adds additional cflags for the target GLibc to disable
new GCC11 checks that lead to compilation errors.

Signed-off-by: Nik Konyuchenko <spaun2002mobile@gmail.com>
This commit is contained in:
Nik Konyuchenko 2021-06-24 00:51:21 -07:00
parent c7996054b5
commit 05c6758985
2 changed files with 11 additions and 0 deletions
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7
config/libc/glibc.in
View File

@ -181,6 +181,7 @@ config GLIBC_CONFIGPARMS
config GLIBC_EXTRA_CFLAGS
string
prompt "extra target CFLAGS"
default "-Wno-missing-attributes -Wno-array-bounds -Wno-array-parameter -Wno-stringop-overflow -Wno-maybe-uninitialized" if GLIBC_2_29_or_older && GCC_11_or_later
default ""
help
Extra target CFLAGS to use when building.
@ -416,4 +417,10 @@ config GLIBC_ENABLE_WERROR
endif
config GLIBC_ENABLE_COMMON_FLAG
bool "Enable -fcommon flag for older version of glibc when using GCC >=10"
default y if GLIBC_2_29_or_older && GCC_10_or_later
default n if GLIBC_2_30_or_later || GCC_9_or_older
endif # KERNEL_LINUX

4
scripts/build/libc/glibc.sh
View File

@ -201,6 +201,10 @@ glibc_backend_once()
# glibc can't be built without -O2 (reference needed!)
glibc_cflags+=" -g -O2"
if [ "${CT_GLIBC_ENABLE_COMMON_FLAG}" = "y" ]; then
glibc_cflags+=" -fcommon"
fi
case "${CT_GLIBC_ENABLE_FORTIFIED_BUILD}" in
y) ;;
*) glibc_cflags+=" -U_FORTIFY_SOURCE";;