This patch adds -static-pie to GCC driver to create static PIE. A static
position independent executable (PIE) is similar to static executable,
but can be loaded at any address without a dynamic linker. All linker
input files must be compiled with -fpie or -fPIE and linker must support
--no-dynamic-linker to avoid linking with dynamic linker. "-z text" is
also needed to prevent dynamic relocations in read-only segments.
PR driver/81498
* common.opt (-static-pie): New alias.
(shared): Negate static-pie.
(-no-pie): Update help text.
(-pie): Likewise.
(static-pie): New option.
* config/gnu-user.h (GNU_USER_TARGET_STARTFILE_SPEC): Add
-static-pie support.
(GNU_USER_TARGET_ENDFILE_SPEC): Likewise.
(LINK_EH_SPEC): Likewise.
(LINK_GCC_C_SEQUENCE_SPEC): Likewise.
* config/i386/gnu-user.h (GNU_USER_TARGET_LINK_SPEC): Likewise.
* config/i386/gnu-user64.h (GNU_USER_TARGET_LINK_SPEC): Likewise.
* gcc.c (LINK_COMMAND_SPEC): Likewise.
(init_gcc_specs): Likewise.
(init_spec): Likewise.
(display_help): Update help message for -pie.
* doc/invoke.texi: Update -pie, -no-pie and -static. Document
-static-pie.
From-SVN: r252034
