Provide precious variables (CFLAGS, PKG_CONFIG_PATH, ...) to make

[mkoeppe]

autotools have a concept of "precious variables"
(https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Setting-Output-Variables.html).

Because we do not use automake, many standard precious variables such as CFLAGS, PKG_CONFIG_PATH are not actually applied to building.

This should be fixed to make our build system more standard.

(from discussions in #29504, and a discussion with gh-mwageringel on a ticket I lost track of)

Likewise, for variables set by .homebrew-build-env (https://groups.google.com/d/msg/sage-devel/taOGXzXq6Lk/ePcXsCvhBAAJ)

See also:

• Make SAGE* environment variables set at configure time to stick #23570 Make SAGE* environment variables set at configure time to stick

CC: @jhpalmieri @mwageringel @dimpase @kiwifb @kliem @dcoudert

Component: build: configure

Keywords: sd111

Issue created by migration from https://trac.sagemath.org/ticket/29507

[mkoeppe]

comment:1

Easiest way to fix it is probably to use automake. Our targets in build/make/Makefile would just become "local" targets (https://www.gnu.org/software/automake/manual/html_node/Extending.html#Extending)

[dimpase]

comment:6

using automake will also make installing of gettext-related stuff in bootstrap easy

[mkoeppe]

Changed keywords from none to sd111

[mkoeppe]

comment:9

CFLAGS and similar were taken care of in #30375.

[mkoeppe]

comment:10

Setting new milestone based on a cursory review of ticket status, priority, and last modification date.