Allows testing of AVX512 changes in a chroot (normally as root)
without build issues.
commit d7e06450b9d730d7b62ba52f611585810fa902df
Author: Carlos O'Donell <carlos@redhat.com>
Date: Tue Jul 16 17:55:43 2013 -0400
BZ #15711: Avoid circular dependency for syscall.h
The generated header is compiled with `-ffreestanding' to avoid any
circular dependencies against the installed implementation headers.
Such a dependency would require the implementation header to be
installed before the generated header could be built (See bug 15711).
In current practice the generated header dependencies do not include
any of the implementation headers removed by the use of `-ffreestanding'.
---
2013-07-15 Carlos O'Donell <carlos@redhat.com>
[BZ #15711]
* sysdeps/unix/sysv/linux/Makefile ($(objpfx)bits/syscall%h):
Avoid system header dependency with -ffreestanding.
($(objpfx)bits/syscall%d): Likewise.
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index f580635..94916a2 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -50,6 +50,13 @@ tests += tst-clone
# be the condition for those options to use in a C #if condition.
# abi-includes may be defined to a list of headers to include
# in the generated header, if the default does not suffice.
+#
+# The generated header is compiled with `-ffreestanding' to avoid any
+# circular dependencies against the installed implementation headers.
+# Such a dependency would require the implementation header to be
+# installed before the generated header could be built (See bug 15711).
+# In current practice the generated header dependencies do not include
+# any of the implementation headers removed by the use of `-ffreestanding'.
$(objpfx)bits/syscall%h $(objpfx)bits/syscall%d: ../sysdeps/unix/sysv/linux/sys/syscall.h
$(make-target-directory)
@@ -64,7 +71,7 @@ $(objpfx)bits/syscall%h $(objpfx)bits/syscall%d: ../sysdeps/unix/sysv/linux/sys/
echo ''; \
$(if $(abi-variants), \
$(foreach v,$(abi-variants),\
- $(CC) -E -MD -MP -MF $(@:.h=.d)-t$(v) -MT '$(@:.d=.h) $(@:.h=.d)' \
+ $(CC) -ffreestanding -E -MD -MP -MF $(@:.h=.d)-t$(v) -MT '$(@:.d=.h) $(@:.h=.d)' \
-x c $(sysincludes) $< $(abi-$(v)-options) \
-D_LIBC -dM | \
sed -n 's@^#define __NR_\([^ ]*\) .*$$@#define SYS_\1 __NR_\1@p' | \
@@ -75,7 +82,7 @@ $(objpfx)bits/syscall%h $(objpfx)bits/syscall%d: ../sysdeps/unix/sysv/linux/sys/
$(if $(abi-$(v)-condition),echo '#endif';) \
rm -f $(@:.d=.h).new$(v); \
), \
- $(CC) -E -MD -MP -MF $(@:.h=.d)-t$(v) -MT '$(@:.d=.h) $(@:.h=.d)' \
+ $(CC) -ffreestanding -E -MD -MP -MF $(@:.h=.d)-t$(v) -MT '$(@:.d=.h) $(@:.h=.d)' \
-x c $(sysincludes) $< \
-D_LIBC -dM | \
sed -n 's@^#define __NR_\([^ ]*\) .*$$@#define SYS_\1 __NR_\1@p' | \