diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/Makefile')
| -rw-r--r-- | sysdeps/unix/sysv/linux/Makefile | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index f580635c84..94916a2b13 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' | \ |