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Enable silent build rules if available in Automake.

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Automake 1.11 introduced the concept of "silent build rules" wherein the
build commands are reported as

  CC     spu_explicit.lo

rather than something along the lines of

  /bin/bash ../libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I../../../../../opmtransport/src -I..     -O3 -DNDEBUG -Wall -Wextra -std=c99 -pedantic -march=native -mtune=native -MT spu_explicit.lo -MD -MP -MF .deps/spu_explicit.Tpo -c -o spu_explicit.lo ../../../../../opmtransport/src/spu_explicit.c
  libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I../../../../../opmtransport/src -I.. -O3 -DNDEBUG -Wall -Wextra -std=c99 -pedantic -march=native -mtune=native -MT spu_explicit.lo -MD -MP -MF .deps/spu_explicit.Tpo -c ../../../../../opmtransport/src/spu_explicit.c  -fPIC -DPIC -o .libs/spu_explicit.o
  libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I../../../../../opmtransport/src -I.. -O3 -DNDEBUG -Wall -Wextra -std=c99 -pedantic -march=native -mtune=native -MT spu_explicit.lo -MD -MP -MF .deps/spu_explicit.Tpo -c ../../../../../opmtransport/src/spu_explicit.c -o spu_explicit.o >/dev/null 2>&1

The former is much easier to read and, consequently, more conducive to
visually noticing diagnostics from the toolset (compiler, linker &c).

On the other hand, only fairly recent editions of Automake have the
"silent rule" capability, so enable silent rules only if available.  In
particular, Automake 1.10.x (the default Automake version in MacOS X
10.6) does not support the capability.  Neither does the default
Automake in CentOS 5.6.

Further details on silent build rules can be found at

  http://sources.redhat.com/automake/automake.html#Options
  http://www.flameeyes.eu/autotools-mythbuster/automake/silent.html

Thanks to Arne Morten Kvarving in Dune Flyspray issue #922
(http://www.dune-project.org/flyspray/index.php?do=details&task_id=922)
for the tip on how to preserve "configure.ac" backwards compatibility
with Automake < 1.11 .
This commit is contained in:
Bård Skaflestad 2011-05-27 15:05:02 +02:00
parent 0dc0be4cad
commit f8f6bba0cd
1 changed files with 9 additions and 0 deletions
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9
configure.ac
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@ -6,6 +6,15 @@ AC_INIT([opmtransport], [0.1], [Jostein.R.Natvig@sintef.no])
AM_INIT_AUTOMAKE([foreign -Wall])
# Use "silent" rules by default if available in the Automake being used to
# process this setup. See, e.g.,
#
# http://www.flameeyes.eu/autotools-mythbuster/automake/silent.html
#
# for details, particularly concerning the backwards compatibility.
#
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
LT_INIT
AC_CONFIG_MACRO_DIR([m4])