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| author | John <jpsinthemix@verizon.net> | 2014-06-04 17:45:42 +0200 |
|---|---|---|
| committer | Kay Sievers <kay@vrfy.org> | 2014-06-04 17:47:20 +0200 |
| commit | 235c6e628199221b7885f159367614b7105547cf (patch) | |
| tree | e45f7e1eaf03a2a08409e756a56965217d10f177 /configure.ac | |
| parent | c221efb2de9a9d8500c0c6baf943bff0d8f87e7f (diff) | |
build-sys: accommodate gcc-4.9.0 link-time optimization (LTO) changes
systemd fails to build (symbols not found/resolved during cgls link step)
under gcc-4.9.0 due to link-time optimization (lto) changes, in particular
from gcc-4.9.0/NEWS:
+ When using a linker plugin, compiling with the -flto option
now generates slim objects files (.o) which only contain
intermediate language representation for LTO. Use
-ffat-lto-objects to create files which contain additionally
the object code. To generate static libraries suitable for LTO
processing, use gcc-ar and gcc-ranlib; to list symbols from a
slim object file use gcc-nm. (Requires that ar, ranlib and nm
have been compiled with plugin support.)
Both -flto and -ffat-lto-objects are now needed when building and linking
against static libs w/LTO.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 6ee4d5fed1..3252e65c98 100644 --- a/configure.ac +++ b/configure.ac @@ -178,7 +178,7 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\ --param=ssp-buffer-size=4]) AS_CASE([$CFLAGS], [*-O[[12345\ ]]*], [CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\ - -flto])], + -flto -ffat-lto-objects])], [AC_MSG_RESULT([skipping -flto, optimization not enabled])]) AC_SUBST([OUR_CFLAGS], "$with_cflags $sanitizer_cflags") |