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