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gcc: Add patch to handle on target multilibs better

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On target multilibs did not work properly since gcc-cross-canadian
was only searching a limited number of sysroot directories to
find multilib target binaries.

This adds an extra search path to ensure those binaries are found
and our gcc-cross-canadian works everywhere we need it to, e.g.
with mips trilib configurations.

(From OE-Core rev: b928d92bb9f76c118846d6c495dc57c149368f0f)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Richard Purdie
2015-07-31 11:26:24 +01:00
parent a95a14afed
commit c4e40a48fb
4 changed files with 178 additions and 0 deletions
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meta/recipes-devtools/gcc/gcc-4.9/0064-handle-target-sysroot-multilib.patch
+88
View File
@@ -0,0 +1,88 @@
Search target sysroot gcc version specific dirs with multilib.
We install the gcc libraries (such as crtbegin.p) into
<sysroot><libdir>/<target-sys>/5.2.0/
which is a default search path for GCC (aka multi_suffix in the
code below). <target-sys> is 'machine' in gcc's terminology. We use
these directories so that multiple gcc versions could in theory
co-exist on target.
We only want to build one gcc-cross-canadian per arch and have this work
for all multilibs. <target-sys> can be handled by mapping the multilib
<target-sys> to the one used by gcc-cross-canadian, e.g. mips64-polkmllib32-linux
is symlinked to by mips64-poky-linux.
The default gcc search path in the target sysroot for a "lib64" mutlilib is:
<sysroot>/lib32/mips64-poky-linux/5.2.0/
<sysroot>/lib32/../lib64/
<sysroot>/usr/lib32/mips64-poky-linux/5.2.0/
<sysroot>/usr/lib32/../lib64/
<sysroot>/lib32/
<sysroot>/usr/lib32/
which means that the lib32 crtbegin.o will be found and the lib64 ones
will not which leads to compiler failures.
This patch injects a multilib version of that path first so the lib64
binaries can be found first. With this change the search path becomes:
<sysroot>/lib32/../lib64/mips64-poky-linux/5.2.0/
<sysroot>/lib32/mips64-poky-linux/5.2.0/
<sysroot>/lib32/../lib64/
<sysroot>/usr/lib32/../lib64/mips64-poky-linux/5.2.0/
<sysroot>/usr/lib32/mips64-poky-linux/5.2.0/
<sysroot>/usr/lib32/../lib64/
<sysroot>/lib32/
<sysroot>/usr/lib32/
Upstream-Status: Pending
RP 2015/7/31
Index: gcc-5.2.0/gcc/gcc.c
===================================================================
--- gcc-5.2.0.orig/gcc/gcc.c
+++ gcc-5.2.0/gcc/gcc.c
@@ -2305,7 +2305,7 @@ for_each_path (const struct path_prefix
if (path == NULL)
{
len = paths->max_len + extra_space + 1;
- len += MAX (MAX (suffix_len, multi_os_dir_len), multiarch_len);
+ len += MAX ((suffix_len + multi_os_dir_len), multiarch_len);
path = XNEWVEC (char, len);
}
@@ -2317,6 +2317,33 @@ for_each_path (const struct path_prefix
/* Look first in MACHINE/VERSION subdirectory. */
if (!skip_multi_dir)
{
+ if (!(pl->os_multilib ? skip_multi_os_dir : skip_multi_dir))
+ {
+ const char *this_multi;
+ size_t this_multi_len;
+
+ if (pl->os_multilib)
+ {
+ this_multi = multi_os_dir;
+ this_multi_len = multi_os_dir_len;
+ }
+ else
+ {
+ this_multi = multi_dir;
+ this_multi_len = multi_dir_len;
+ }
+
+ /* Look in multilib MACHINE/VERSION subdirectory first */
+ if (this_multi_len)
+ {
+ memcpy (path + len, this_multi, this_multi_len + 1);
+ memcpy (path + len + this_multi_len, multi_suffix, suffix_len + 1);
+ ret = callback (path, callback_info);
+ if (ret)
+ break;
+ }
+ }
+
memcpy (path + len, multi_suffix, suffix_len + 1);
ret = callback (path, callback_info);
if (ret)