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build: Fix native_posix build on GNU GCC

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Update -fno-pie to only be added when relevant. This fixes native_posix
builds on Debian hosts.

* Debian and other Linux distributions have ld with --warn-textrel as
default.
* The option generates a warning when linking on x86.
* The warning make scripts/twister fail because we treat all warnings
as error.
* The warning is issued when no PIE objects are linked against PIE
library.
* PIE (Position Independent Executable) or not can be seen with the
following command.
* When you want to generate non PIE, link with `-no-pie.`

Non PIE

  $ readelf -l build/zephyr/zephyr.elf | grep 'Elf file type is'
  Elf file type is EXEC (Executable file)

PIE

  $ readelf -l /lib/x86_64-linux-gnu/libc.so.6 | \
  grep 'Elf file type is'
  Elf file type is DYN (Shared object file)

Issue #35244

Signed-off-by: Yuval Peress <peress@google.com>
This commit is contained in:
Yuval Peress 2021-09-27 23:04:25 -06:00 • committed by Anas Nashif
commit a81f8af701
2 changed files with 1 additions and 1 deletions
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1
cmake/linker/ld/target_baremetal.cmake
View file

@ -8,7 +8,6 @@ macro(toolchain_ld_baremetal)
zephyr_ld_options( zephyr_ld_options(
-nostdlib -nostdlib
-static -static
-no-pie
${LINKERFLAGPREFIX},-X ${LINKERFLAGPREFIX},-X
${LINKERFLAGPREFIX},-N ${LINKERFLAGPREFIX},-N
) )

1
cmake/linker/ld/target_base.cmake
View file

@ -11,6 +11,7 @@ macro(toolchain_ld_base)
# TOOLCHAIN_LD_FLAGS comes from compiler/gcc/target.cmake # TOOLCHAIN_LD_FLAGS comes from compiler/gcc/target.cmake
# LINKERFLAGPREFIX comes from linker/ld/target.cmake # LINKERFLAGPREFIX comes from linker/ld/target.cmake
zephyr_ld_options( zephyr_ld_options(
-no-pie
${TOOLCHAIN_LD_FLAGS} ${TOOLCHAIN_LD_FLAGS}
) )