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build/autotools: depend "config-extra.h" on "config.h"

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"config-extra.h" is really just like "config.h", except it works around some
limitations of autoconf.

If we depend on "Makefile", any changes to "Makefile.am" will cause a full
rebuild. We want to avoid that.

Instead, depend on "config.h". That one only changes when configure runs
again. And that's the better dependancy, because "config-extra.h" is
generated based on informations generated by configure (despite being
generated by "Makefile").
This commit is contained in:
Thomas Haller 2019-06-17 12:56:35 +02:00
parent 7ed1fc817f
commit 721f238946
1 changed files with 1 additions and 1 deletions
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2
Makefile.am
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@ -109,7 +109,7 @@ dflt_cppflags = -std=gnu11
# See https://www.gnu.org/software/autoconf/manual/autoconf-2.63/html_node/Installation-Directory-Variables.html
#
# With meson-only, they could just be set via config.h.meson
config-extra.h: Makefile
config-extra.h: config.h
$(AM_V_GEN) \
echo "/* Generated by Makefile.am */" >$@ && \
echo "#define BINDIR \"$(bindir)\"" >>$@ && \