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| author | Austin Seipp <aseipp@pobox.com> | 2013-05-04 16:07:22 -0500 |
|---|---|---|
| committer | Austin Seipp <aseipp@pobox.com> | 2013-06-16 20:01:25 -0500 |
| commit | 71a194d8ca2efd075a5c000be0b378c8706ca0b3 (patch) | |
| tree | 2bc67fdf845354bbe4fb0b3f729b0e8c054dc8ca /aclocal.m4 | |
| parent | b097dc9a25f986f0a07dcd2ad1e7fdeeac63198a (diff) | |
| download | haskell-71a194d8ca2efd075a5c000be0b378c8706ca0b3.tar.gz | |
Detect linker information at runtime. Fixes Trac #6063
Previously, we did ./configure time checks to see if 'GNU ld' supported
certain options. If it does, we bake those options into the link step.
See Trac #5240.
Unfortunately, the linker we use at runtime can change for several
reasons. One is that the user specifies -pgml 'foo'. The other is if
/usr/bin/ld or whatnot changes from when GHC was built. Those options
mentioned earlier are specific to GNU ld, but many systems support GNU
gold too. This is Trac #6063.
So we need to check at runtime what linker we're using. This is actually
a little bit complicated because we normally use the C compiler as our
linker. Windows and OS X are also special here.
Finally, this patch also unconditionally gives '--hash-size=31' and
'--reduce-memory-overheads' to the system linker if it's GNU ld. These
options have been supported for 8+ years from what I can see, and there
are probably a lot of other reasons why GHC would not work with such an
ancient binutils, all things considered.
See Note [Run-time linker info] in SysTools for details. There are
plenty of comments as well in the surrounding code.
Signed-off-by: Austin Seipp <aseipp@pobox.com>
Diffstat (limited to 'aclocal.m4')
| -rw-r--r-- | aclocal.m4 | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/aclocal.m4 b/aclocal.m4 index 2ab4ad5ddb..0283206d67 100644 --- a/aclocal.m4 +++ b/aclocal.m4 @@ -535,18 +535,6 @@ AC_DEFUN([FPTOOLS_SET_C_LD_FLAGS], $2="$$2 -fno-stack-protector" fi - # Reduce memory usage when linking. See trac #5240. - if test -n "$LdHashSize31" - then - $3="$$3 -Wl,$LdHashSize31" - $4="$$4 $LdHashSize31" - fi - if test -n "$LdReduceMemoryOverheads" - then - $3="$$3 -Wl,$LdReduceMemoryOverheads" - $4="$$4 $LdReduceMemoryOverheads" - fi - rm -f conftest.c conftest.o AC_MSG_RESULT([done]) ]) @@ -921,27 +909,6 @@ $2=$fp_cv_$2 ])# FP_PROG_LD_FLAG -# FP_PROG_LD_HashSize31 -# ------------ -# Sets the output variable LdHashSize31 to --hash-size=31 if ld supports -# this flag. Otherwise the variable's value is empty. -AC_DEFUN([FP_PROG_LD_HashSize31], -[ -FP_PROG_LD_FLAG([--hash-size=31],[LdHashSize31]) -])# FP_PROG_LD_HashSize31 - - -# FP_PROG_LD_ReduceMemoryOverheads -# ------------ -# Sets the output variable LdReduceMemoryOverheads to -# --reduce-memory-overheads if ld supports this flag. -# Otherwise the variable's value is empty. -AC_DEFUN([FP_PROG_LD_ReduceMemoryOverheads], -[ -FP_PROG_LD_FLAG([--reduce-memory-overheads],[LdReduceMemoryOverheads]) -])# FP_PROG_LD_ReduceMemoryOverheads - - # FP_PROG_LD_BUILD_ID # ------------ |