diff options
| author | Emil Velikov <[email protected]> | 2014-03-11 17:58:08 +0000 |
|---|---|---|
| committer | Emil Velikov <[email protected]> | 2014-03-31 14:56:14 +0100 |
| commit | d681b22ed77274a805c6c8e81925c18eeb57a968 (patch) | |
| tree | 123ac46987e30805fe5ca7b514597ae0b0565f02 /configure.ac | |
| parent | d187a150d45cbf5bd3476eab49be5057382c2c86 (diff) | |
automake: ask the linker to do garbage collection
By doing GC the linker removes all the symbols that are not referenced
and/or used by the final library. This results in a saving of ~100K
up-to ~600K per (stripped) binary (classic vs gallium drivers).
If interested one can ask the compiler to print the sections that are
removed using -Wl,--print-gc-sections.
v2: Check if ld supports the flag before using it.
Signed-off-by: Emil Velikov <[email protected]>
Acked-by: Matt Turner <[email protected]> (v1)
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 3055de67a7e..af1b0d1fa40 100644 --- a/configure.ac +++ b/configure.ac @@ -316,6 +316,22 @@ if test "x$enable_debug" = xyes; then fi dnl +dnl Check if linker supports garbage collection +dnl +save_LDFLAGS=$LDFLAGS +LDFLAGS="$LDFLAGS -Wl,--gc-sections" +AC_MSG_CHECKING([whether ld supports --gc-sections]) +AC_LINK_IFELSE( + [AC_LANG_SOURCE([static char UnusedFunc() { return 5; } int main() { return 0;}])], + [AC_MSG_RESULT([yes]) + GC_SECTIONS="-Wl,--gc-sections";], + [AC_MSG_RESULT([no]) + GC_SECTIONS="";]) +LDFLAGS=$save_LDFLAGS + +AC_SUBST([GC_SECTIONS]) + +dnl dnl compatibility symlinks dnl case "$host_os" in |