/usr/src/glibc/debian/sysdeps/x32.mk is in eglibc-source 2.19-0ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | libc_rtlddir = /libx32
extra_config_options = --enable-multi-arch
# build 64-bit (amd64) alternative library
EGLIBC_PASSES += amd64
DEB_ARCH_REGULAR_PACKAGES += libc6-amd64 libc6-dev-amd64
libc6-amd64_shlib_dep = libc6-amd64 (>= $(shlib_dep_ver))
amd64_add-ons = nptl $(add-ons)
amd64_configure_target = x86_64-linux-gnu
amd64_CC = $(CC) -m64
amd64_CXX = $(CXX) -m64
amd64_extra_config_options = $(extra_config_options) --disable-profile
amd64_rtlddir = /lib64
amd64_slibdir = /lib64
amd64_libdir = /usr/lib64
define libc6-dev-amd64_extra_pkg_install
mkdir -p debian/libc6-dev-amd64/usr/include
ln -s x86_64-linux-gnux32/bits debian/libc6-dev-amd64/usr/include/
ln -s x86_64-linux-gnux32/gnu debian/libc6-dev-amd64/usr/include/
ln -s x86_64-linux-gnux32/fpu_control.h debian/libc6-dev-amd64/usr/include/
mkdir -p debian/libc6-dev-amd64/usr/include/x86_64-linux-gnux32/gnu
cp -a debian/tmp-amd64/usr/include/gnu/stubs-64.h \
debian/libc6-dev-amd64/usr/include/x86_64-linux-gnux32/gnu
mkdir -p debian/libc6-dev-amd64/usr/include/sys
for i in `ls debian/tmp-libc/usr/include/x86_64-linux-gnux32/sys`; do \
ln -s ../x86_64-linux-gnux32/sys/$$i debian/libc6-dev-amd64/usr/include/sys/$$i ; \
done
endef
# build 32-bit (i386) alternative library
EGLIBC_PASSES += i386
DEB_ARCH_REGULAR_PACKAGES += libc6-i386 libc6-dev-i386
libc6-i386_shlib_dep = libc6-i386 (>= $(shlib_dep_ver))
i386_add-ons = nptl $(add-ons)
i386_configure_target = i686-linux-gnu
i386_CC = $(CC) -m32
i386_CXX = $(CXX) -m32
i386_extra_cflags = -march=pentium4 -mtune=generic
i386_extra_config_options = $(extra_config_options) --disable-profile
i386_slibdir = /lib32
i386_libdir = /usr/lib32
define libc6-dev-i386_extra_pkg_install
mkdir -p debian/libc6-dev-i386/usr/include/x86_64-linux-gnux32/gnu
cp -a debian/tmp-i386/usr/include/gnu/stubs-32.h \
debian/libc6-dev-i386/usr/include/x86_64-linux-gnux32/gnu
endef
define libc6-i386_extra_pkg_install
mkdir -p debian/libc6-i386/lib
ln -sf /lib32/ld-linux.so.2 debian/libc6-i386/lib
endef
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