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libc/glibc: fix building for seemingly native toolchains

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Build glibc with -O2 as a fix/workaround to building
seemingly-native toolchains.

See:
- docs/overview.txt
- docs/known-issues.txt
- http://sourceware.org/ml/crossgcc/2009-09/msg00055.html
This commit is contained in:
Yann E. MORIN" 2009-10-02 22:10:38 +02:00
parent 7280facf18
commit 443f51a2dc
3 changed files with 24 additions and 6 deletions
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6
docs/known-issues.txt
View File

@ -51,8 +51,10 @@ Fix:
None known.
Workaround:
If this happens for you, stick with glibc-2.6.1 for now.
Or investigate! :-)
It seems that using -O2 in the CFLAGS fixes the problem. It has been
confirmed in the following threads:
http://sourceware.org/ml/crossgcc/2009-09/msg00055.html (for glibc)
http://sourceware.org/ml/crossgcc/2009-10/msg00001.html (for eglibc)
--------------------------------
Symptoms:

16
docs/overview.txt
View File

@ -28,6 +28,7 @@ Running crosstool-NG
Tools wrapper
Using the toolchain
Toolchain types
Seemingly-native toolchains
Internals
Makefile front-end
Kconfig parser
@ -590,6 +591,21 @@ anyway!)
were all being hashed out, Canada had three national political parties.
http://en.wikipedia.org/wiki/Cross_compiler
Seemingly-native toolchains |
----------------------------+
Seemingly-native toolchains are toolchains that target the same architecture
as the one it is built on, and on which it will run, but the machine tuple
may be different (eg i686 vs. i386, or x86_64-unknown-linux-gnu vs.
x86_64-pc-linux-gnu). This also applies if the target architecture is of the
same kind (eg. x86 vs. x86_64, or ppc vs. ppc64).
Such toolchain is tricky to build, as the configure scripts may incorrectly
assume that files (headers and libs) from the build (or host) machine can be
used by the cross-compiler it is going to build. The problem seems to arise
only with glibc (and eglibc?) starting with version 2.7.
_____________
/
Internals /

8
scripts/build/libc/glibc.sh
View File

@ -180,7 +180,7 @@ do_libc_headers() {
libc_cv_ppc_machine=yes \
CT_DoExecLog ALL \
make CFLAGS="-O -DBOOTSTRAP_GCC" \
make CFLAGS="-O2 -DBOOTSTRAP_GCC" \
OBJDUMP_FOR_HOST="${CT_TARGET}-objdump" \
PARALLELMFLAGS="${PARALLELMFLAGS}" \
sysdeps/gnu/errlist.c
@ -197,7 +197,7 @@ do_libc_headers() {
CT_DoExecLog ALL \
make cross-compiling=yes \
install_root=${CT_SYSROOT_DIR} \
CFLAGS="-O -DBOOTSTRAP_GCC" \
CFLAGS="-O2 -DBOOTSTRAP_GCC" \
${LIBC_SYSROOT_ARG} \
OBJDUMP_FOR_HOST="${CT_TARGET}-objdump" \
PARALLELMFLAGS="${PARALLELMFLAGS}" \
@ -325,7 +325,7 @@ do_libc_start_files() {
# Please see the comment for the configure step in do_libc().
BUILD_CC="${CT_BUILD}-gcc" \
CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} -O " \
CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} -O2" \
CC="${cross_cc} ${CT_LIBC_EXTRA_CC_ARGS} ${extra_cc_args}" \
AR=${CT_TARGET}-ar \
RANLIB=${CT_TARGET}-ranlib \
@ -457,7 +457,7 @@ do_libc() {
# silly messages. GNU folks again, he?
BUILD_CC="${CT_BUILD}-gcc" \
CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} -O" \
CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} -O2" \
CC="${CT_TARGET}-gcc ${CT_LIBC_EXTRA_CC_ARGS} ${extra_cc_args}" \
AR=${CT_TARGET}-ar \
RANLIB=${CT_TARGET}-ranlib \