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configure.ac: make possible to compile with -ffunction/data-sections

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The -ffunction-sections and -fdata-sections, if supported, can enable
the linker to do some amount of dead code elimination.  Basically a
very basic form of LTO.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
H. Peter Anvin 2017-02-28 19:34:36 -08:00
parent 9b935a0ea8
commit 0c36965335
1 changed files with 13 additions and 4 deletions
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17
configure.ac
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@ -151,11 +151,12 @@ PA_FUNC_ATTRIBUTE(pure)
PA_FUNC_ATTRIBUTE_ERROR
dnl
dnl support ccache
dnl support function sections
dnl
AC_ARG_ENABLE([ccache],
[AC_HELP_STRING([--enable-ccache], [compile with ccache])],
[CC="ccache $CC"],
AC_ARG_ENABLE([sections],
[AC_HELP_STRING([--enable-sections], [compile with function/data section support])],
[PA_ADD_CFLAGS([-ffunction-sections]),
PA_ADD_CFLAGS([-fdata-sections])],
[])
dnl
@ -203,5 +204,13 @@ PA_ADD_CFLAGS([-Werror=missing-declarations])
PA_ADD_CFLAGS([-Werror=comment])
PA_ADD_CFLAGS([-Werror=vla])])
dnl
dnl support ccache
dnl
AC_ARG_ENABLE([ccache],
[AC_HELP_STRING([--enable-ccache], [compile with ccache])],
[CC="ccache $CC"],
[])
AC_OUTPUT_COMMANDS([mkdir -p config nasmlib nsis output stdlib x86 asm disasm])
AC_OUTPUT(Makefile rdoff/Makefile doc/Makefile)