[PATCH util/macros] Rework stderr messages for the _CMD macros

[Emil Velikov]

From: Emil Velikov <emil.velikov at collabora.com>

Redirect stderr from git, sh and cp to /dev/null to cut down the 'spam'
and reword the error messages to be less misleading.

Why ? Currently CHANGELOG_CMD can fail for any of the following reasons:
 - git executable is missing
 - .git is missing and/or malformed
 - srcdir is RO - thus the stdout redirection will fail

Yet things fail (yes that's fine) due to #3 on each `make distcheck'
although #2 is the one suggested, always.

If we really want to, we can attribute each case with respective
message. Yet that will make the macro twice as large. Considering that
we're unlikely to bother [or be able to do anything], keep things short
and simple.

Without the patch we get the following on each `make distcheck':

"
/bin/sh: ../../.changelog.tmp: Permission denied
git directory not found: installing possibly empty changelog.
cp: cannot create regular file '../../.INSTALL.tmp': Permission denied
util-macros "pkgdatadir" from xorg-macros.pc not found: installing possibly empty INSTALL.
/bin/sh: ../../.changelog.tmp: Permission denied
git directory not found: installing possibly empty changelog.
cp: cannot create regular file '../../.INSTALL.tmp': Permission denied
util-macros "pkgdatadir" from xorg-macros.pc not found: installing possibly empty INSTALL.
"

and after:

"
git failed to create chanelog: installing possibly empty changelog.
failed to copy INSTALL from util-macros: installing possibly empty INSTALL.
git failed to create chanelog: installing possibly empty changelog.
failed to copy INSTALL from util-macros: installing possibly empty INSTALL.
"

Cc: Gaetan Nadon <memsize at videotron.ca>
Cc: Peter Hutterer <peter.hutterer at who-t.net>
Signed-off-by: Emil Velikov <emil.velikov at collabora.com>
---
As mentioned before - we could do a test -f so establish if file is
already there. This will remove the warnings all together when doing
`make distcheck'.

Please state your preference for/again each approach.
---
 xorg-macros.m4.in | 4 ++--
 xorgversion.m4    | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/xorg-macros.m4.in b/xorg-macros.m4.in
index 2ed7837..70f6a75 100644
--- a/xorg-macros.m4.in
+++ b/xorg-macros.m4.in
@@ -1837,9 +1837,9 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])],
 AC_DEFUN([XORG_INSTALL], [
 AC_REQUIRE([PKG_PROG_PKG_CONFIG])
 macros_datadir=`$PKG_CONFIG --print-errors --variable=pkgdatadir xorg-macros`
-INSTALL_CMD="(cp -f "$macros_datadir/INSTALL" \$(top_srcdir)/.INSTALL.tmp && \
+INSTALL_CMD="(cp -f "$macros_datadir/INSTALL" \$(top_srcdir)/.INSTALL.tmp 2>/dev/null && \
 mv \$(top_srcdir)/.INSTALL.tmp \$(top_srcdir)/INSTALL) \
 || (rm -f \$(top_srcdir)/.INSTALL.tmp; touch \$(top_srcdir)/INSTALL; \
-echo 'util-macros \"pkgdatadir\" from xorg-macros.pc not found: installing possibly empty INSTALL.' >&2)"
+echo 'failed to copy INSTALL from util-macros: installing possibly empty INSTALL.' >&2)"
 AC_SUBST([INSTALL_CMD])
 ]) # XORG_INSTALL
diff --git a/xorgversion.m4 b/xorgversion.m4
index 19f2ffd..d5c4377 100644
--- a/xorgversion.m4
+++ b/xorgversion.m4
@@ -56,9 +56,9 @@ AC_DEFUN([XORG_RELEASE_VERSION],[
 #
 #
 AC_DEFUN([XORG_CHANGELOG], [
-CHANGELOG_CMD="(GIT_DIR=\$(top_srcdir)/.git git log > \$(top_srcdir)/.changelog.tmp && \
+CHANGELOG_CMD="((GIT_DIR=\$(top_srcdir)/.git git log > \$(top_srcdir)/.changelog.tmp) 2>/dev/null && \
 mv \$(top_srcdir)/.changelog.tmp \$(top_srcdir)/ChangeLog) \
 || (rm -f \$(top_srcdir)/.changelog.tmp; touch \$(top_srcdir)/ChangeLog; \
-echo 'git directory not found: installing possibly empty changelog.' >&2)"
+echo 'git failed to create chanelog: installing possibly empty changelog.' >&2)"
 AC_SUBST([CHANGELOG_CMD])
 ]) # XORG_CHANGELOG
-- 
2.11.0