diff options
Diffstat (limited to 'meta/recipes-devtools/gcc/libgcc-initial.inc')
| -rw-r--r-- | meta/recipes-devtools/gcc/libgcc-initial.inc | 52 |
1 files changed, 45 insertions, 7 deletions
diff --git a/meta/recipes-devtools/gcc/libgcc-initial.inc b/meta/recipes-devtools/gcc/libgcc-initial.inc index 950ad861e7..8251e3c286 100644 --- a/meta/recipes-devtools/gcc/libgcc-initial.inc +++ b/meta/recipes-devtools/gcc/libgcc-initial.inc @@ -1,20 +1,58 @@ +# +# Notes on the way the OE cross toolchain now works +# +# We need a libgcc to build glibc. Tranditionally we therefore built +# a non-threaded and non-shared compiler (gcc-cross-initial), then use +# that to build libgcc-initial which is used to build glibc which we can +# then build gcc-cross and libgcc against. +# +# We were able to drop the glibc dependency from gcc-cross, with two tweaks: + +# a) specify the minimum glibc version to support in a configure option +# b) create a dummy limits.h file so that later when glibc creates one, +# the headers structure has support for it. We can do this with a simple +# empty file +# +# Once gcc-cross is libc independent, we can use it to build both +# libgcc-initial and then later libgcc. +# +# libgcc-initial is tricky as we need to imitate the non-threaded and +# non-shared case. We can do that by hacking the threading mode back to +# "single" even if gcc reports "posix" and disable libc presence for the +# libgcc-intial build. We have to create the dummy limits.h to avoid +# compiler errors from a missing header. +# +# glibc will fail to link with libgcc-initial due to a missing "exception +# handler" capable libgcc (libgcc_eh.a). Since we know glibc doesn't need +# any exception handler, we can safely symlink to libgcc.a. +# + require libgcc-common.inc -DEPENDS = "virtual/${TARGET_PREFIX}gcc-initial" +DEPENDS = "virtual/${TARGET_PREFIX}gcc" LICENSE = "GPL-3.0-with-GCC-exception" -STAGINGCC = "gcc-cross-initial-${TARGET_ARCH}" -STAGINGCC_class-nativesdk = "gcc-crosssdk-initial-${SDK_SYS}" -PATH_prepend = "${STAGING_BINDIR_TOOLCHAIN}.${STAGINGCC}:" - PACKAGES = "" EXTRA_OECONF += "--disable-shared" -COMPILERINITIAL = "-initial" - inherit nopackages # We really only want this built by things that need it, not any recrdeptask deltask do_build + +do_configure:prepend () { + install -d ${STAGING_INCDIR} + touch ${STAGING_INCDIR}/limits.h + sed -i -e 's#INHIBIT_LIBC_CFLAGS =.*#INHIBIT_LIBC_CFLAGS = -Dinhibit_libc#' ${B}/gcc/libgcc.mvars + sed -i -e 's#inhibit_libc = false#inhibit_libc = true#' ${B}/gcc/Makefile +} + +do_configure:append () { + sed -i -e 's#thread_header = .*#thread_header = gthr-single.h#' ${B}/${BPN}/Makefile +} + +do_install:append () { + ln -s libgcc.a ${D}${libdir}/${TARGET_SYS}/${BINV}/libgcc_eh.a +} |