This file is indexed.

/usr/share/ada/debian_packaging.mk is in gnat-4.9 4.9.3-3ubuntu5.

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The actual contents of the file can be viewed below.

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# Common settings for Ada Debian packaging.
#
#  Copyright (C) 2012-2014 Nicolas Boulenguez <nicolas@debian.org>
#
#  This program is free software: you can redistribute it and/or
#  modify it under the terms of the GNU General Public License as
#  published by the Free Software Foundation, either version 3 of the
#  License, or (at your option) any later version.
#  This program is distributed in the hope that it will be useful, but
#  WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
#  General Public License for more details.
#  You should have received a copy of the GNU General Public License
#  along with this program. If not, see <http://www.gnu.org/licenses/>.
#

# dpkg-dev (>= 1.16.1) provides /usr/share/dpkg/default.mk (or the
# more specific buildflags.mk) to set standard variables like
# DEB_HOST_MULTIARCH, CFLAGS, LDFLAGS...) according to the build
# environment (DEB_BUILD_OPTIONS...) and the policy (hardening
# flags...).
# You must include it before this file.
ifeq (,$(findstring /usr/share/dpkg/buildflags.mk,$(MAKEFILE_LIST)))
  $(error Please include /usr/share/dpkg/default.mk (or the more specific \
          buildflags.mk) before $(lastword $(MAKEFILE_LIST)))
endif

# Ada is not in dpkg-dev flag list. We add a sensible default here.

# Format checking is meaningless for Ada sources.
ADAFLAGS := $(filter-out -Wformat -Werror=format-security, $(CFLAGS))

ifdef DPKG_EXPORT_BUILDFLAGS
  export ADAFLAGS
endif

# Avoid dpkg-shlibdeps warning about depending on a library from which
# no symbol is used, see http://wiki.debian.org/ToolChain/DSOLinking.
# Gnatmake users must upgrade to >= 4.6.4-1 to circumvent #680292.
LDFLAGS += -Wl,--as-needed

# Warn during build time if undefined symbols.
LDFLAGS += -Wl,-z,defs

ifdef DPKG_EXPORT_BUILDFLAGS
  export LDFLAGS
endif

######################################################################
# C compiler version

# GCC binaries must be compatible with GNAT at the binary level, use
# the same version. This setting is mandatory for every upstream C
# compilation ("export CC" is enough for dh_auto_configure with a
# normal ./configure).

CC := gnatgcc

######################################################################
# Options for gprbuild/gnatmake.

# Let Make delegate parallelism to gnatmake/gprbuild.
.NOTPARALLEL:

# Use all processors unless parallel=n is set in DEB_BUILD_OPTIONS.
# http://www.debian.org/doc/debian-policy/ch-source.html#s-debianrules-options
BUILDER_JOBS := $(filter parallel=%,$(DEB_BUILD_OPTIONS))
ifneq (,$(BUILDER_JOBS))
  BUILDER_JOBS := $(subst parallel=,,$(BUILDER_JOBS))
else
  BUILDER_JOBS := $(shell getconf _NPROCESSORS_ONLN)
endif
BUILDER_OPTIONS += -j$(BUILDER_JOBS)

BUILDER_OPTIONS += -R
# Avoid lintian warning about setting an explicit library runpath.
# http://wiki.debian.org/RpathIssue

BUILDER_OPTIONS += -v
# Make exact command lines available for automatic log checkers.

BUILDER_OPTIONS += -eS
# Tell gnatmake to echo commands to stdout instead of stderr, avoiding
# buildds thinking it is inactive and killing it.
# -eS is the default on gprbuild.

# You may be interested in
# -s  recompile if compilation switches have changed
#     (bad default because of interactions between -amxs and standard library)
# -we handle warnings as errors
# -vP2 verbose when parsing projects.