The fake Clang /usr/include/tgmath.h dependency bug is:

https://github.com/llvm/llvm-project/issues/120891

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>

Remove the /usr/include/tgmath.h dependency generated by Clang even though
Clang never reads /usr/include/tgmath.h.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>

Add $(sysdep-ASFLAGS) $(ASFLAGS-$(<F)) $(ASFLAGS-$(@F)) to compile.S and
COMPILE.S to support compiling .S files with additional options.

On x86-64 machine with

[hjl@gnu-cfl-3 x86-glibc]$ ls -l /usr/include/asm/prctl.h sysdeps/unix/sysv/linux/x86_64/include/asm/prctl.h
-rw-r--r-- 1 hjl  hjl   825 Jan  9 09:41 sysdeps/unix/sysv/linux/x86_64/include/asm/prctl.h
-rw-r--r-- 1 root root 1170 Nov 27 16:00 /usr/include/asm/prctl.h
[hjl@gnu-cfl-3 x86-glibc]$

glibc configured with --enable-cet build failed:

make[2]: Entering directory '/export/gnu/import/git/gitlab/x86-glibc/iconv'
../Makerules:327: update target
'/export/build/gnu/tools-build/glibc-cet-gitlab/build-x86_64-linux/gnu/lib-names-64.h'
due to: /export/build/gnu/tools-build/glibc-cet-gitlab/build-x86_64-linux/gnu/lib-names-64.stmp
:
../Makeconfig:1216: update target
'/export/build/gnu/tools-build/glibc-cet-gitlab/build-x86_64-linux/libc-modules.h'
due to: /export/build/gnu/tools-build/glibc-cet-gitlab/build-x86_64-linux/libc-modules.stmp
:
../Makerules:1126: update target '/usr/include/asm/prctl.h' due to:
../sysdeps/unix/sysv/linux/x86_64/64/../include/asm/prctl.h
force-install
/usr/bin/install -c -m 644
../sysdeps/unix/sysv/linux/x86_64/64/../include/asm/prctl.h
/usr/include/asm/prctl.h
/usr/bin/install: cannot remove '/usr/include/asm/prctl.h': Permission denied
make[2]: *** [../Makerules:1126: /usr/include/asm/prctl.h] Error 1
make[2]: Leaving directory '/export/gnu/import/git/gitlab/x86-glibc/iconv'
make[1]: *** [Makefile:484: iconv/subdir_lib] Error 2
make[1]: Leaving directory '/export/gnu/import/git/gitlab/x86-glibc'
make: *** [Makefile:9: all] Error 2

This is triggered by the rule in Makerules:

$(inst_includedir)/%.h: $(..)include/%.h $(+force)
  $(do-install)

Since no files under include/ should be installed, remove it from
Makerules.

Tested it on x86-64.  There are no differences in the installed header
files.

This patch improves tests-clean Makefile target to reliably clean
test artifacts from a build directory.  Before this patch tests-clean
missed around 3k (out of total 9k) .out and .test-result files.

Signed-off-by: Maxim Kuvyrkov <maxim.kuvyrkov@linaro.org>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Now that there is no need to use a special linker script to hardening
internal data structures, remove the --with-default-link configure
option and associated definitions.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Instead of using a special ELF section along with a linker script
directive to put the IO vtables within the RELRO section, the libio
vtables are all moved to an array marked as data.relro (so linker
will place in the RELRO segment without the need of extra directives).

To avoid static linking namespace issues and including all vtable
referenced objects, all required function pointers are set to weak alias.

Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>