/usr/src/glibc/debian/sysdeps/i386.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.
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libc_extra_cflags = -mno-tls-direct-seg-refs -fno-regmove
# 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
# __x86_64__ is defined here because Makeconfig uses -undef and the
# /usr/include/asm wrappers need that symbol.
amd64_CC = $(CC) -m64 -D__x86_64__
amd64_CXX = $(CXX) -m64 -D__x86_64__
amd64_extra_config_options = $(extra_config_options) --disable-profile
amd64_rtlddir = /lib64
amd64_slibdir = /lib64
amd64_libdir = /usr/lib64
define amd64_extra_install
cp debian/tmp-amd64/usr/bin/ldd \
debian/tmp-libc/usr/bin
endef
define libc6-dev-amd64_extra_pkg_install
mkdir -p debian/libc6-dev-amd64/usr/include
ln -sf i386-linux-gnu/bits debian/libc6-dev-amd64/usr/include/
ln -sf i386-linux-gnu/gnu debian/libc6-dev-amd64/usr/include/
ln -sf i386-linux-gnu/fpu_control.h debian/libc6-dev-amd64/usr/include/
mkdir -p debian/libc6-dev-amd64/usr/include/i386-linux-gnu/gnu
cp -a debian/tmp-amd64/usr/include/gnu/stubs-64.h \
debian/libc6-dev-amd64/usr/include/i386-linux-gnu/gnu
mkdir -p debian/libc6-dev-amd64/usr/include/sys
for i in `ls debian/tmp-libc/usr/include/i386-linux-gnu/sys` ; do \
ln -sf ../i386-linux-gnu/sys/$$i debian/libc6-dev-amd64/usr/include/sys/$$i ; \
done
endef
# build x32 ABI alternative library
EGLIBC_PASSES += x32
DEB_ARCH_REGULAR_PACKAGES += libc6-x32 libc6-dev-x32
libc6-x32_shlib_dep = libc6-x32 (>= $(shlib_dep_ver))
x32_add-ons = nptl $(add-ons)
x32_configure_target = x86_64-linux-gnux32
x32_CC = $(CC) -mx32
x32_CXX = $(CXX) -mx32
x32_extra_config_options = $(extra_config_options) --disable-profile
x32_rtlddir = /libx32
x32_slibdir = /libx32
x32_libdir = /usr/libx32
define libc6-dev-x32_extra_pkg_install
mkdir -p debian/libc6-dev-x32/usr/include/i386-linux-gnu/gnu
cp -a debian/tmp-x32/usr/include/gnu/stubs-x32.h \
debian/libc6-dev-x32/usr/include/i386-linux-gnu/gnu
endef
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