[notmuch] [PATCH] Makefile: Magic silent rules.

[Carl Worth]

On Sun, 22 Nov 2009 04:50:41 +0600, Mikhail Gusarov <dottedmag at dottedmag.net> wrote:
> Uhm. Now it eats much less :)
> 
> $ make
> ...
>   GZIP	notmuch.1.gz
> /bin/sh: --rsyncable: not found
> make: *** [notmuch.1.gz] Error 127
> $
> 
> $ make V=1
> ...
> rsyncable --stdout notmuch.1 > notmuch.1.gz
> /bin/sh: rsyncable: not found
> make: [notmuch.1.gz] Error 127 (ignored)

The bug here was in using the GZIP variable assuming it would be a
program name. But since gzip expects it to be additional arguments, we
need to use a different name such as a "gzip" variable.

Thanks for the original implementation, Chris. And thanks for the
testing, Mikhail.

I've pushed the original plus the below on top.

-Carl

commit 1266d8511e9adc7296ec4ddbf609dec824b4c94f
Author: Carl Worth <cworth at cworth.org>
Date:   Sun Nov 22 04:45:16 2009 +0100

    Makefile: Fix to work even with GZIP environment variable set.
    
    The rule here was written to assume that if the GZIP environment
    variable was set that it would be the gzip binary to execute,
    (similar to the CC and CXX variables). But GZIP is actually used
    to pass arguments to gzip, so we have to use a different name.

diff --git a/Makefile b/Makefile
index 5d8f321..ae8bff1 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,9 @@ CFLAGS=-O2
 
 # Additional programs that are used during the compilation process.
 EMACS ?= emacs
-GZIP ?= gzip
+# Lowercase to avoid clash with GZIP environment variable for passing
+# arguments to gzip.
+gzip = gzip
 
 # Additional flags that we will append to whatever the user set.
 # These aren't intended for the user to manipulate.
diff --git a/Makefile.local b/Makefile.local
index 5fd5d4f..b6d3db3 100644
--- a/Makefile.local
+++ b/Makefile.local
@@ -23,7 +23,7 @@ notmuch: $(notmuch_client_modules) lib/notmuch.a
        $(call quiet,CXX) $^ $(LDFLAGS) -o $@
 
 notmuch.1.gz: notmuch.1
-       $(call quiet,GZIP) --stdout $^ > $@
+       $(call quiet,gzip) --stdout $^ > $@
 
 install: all notmuch.1.gz
        for d in $(DESTDIR)$(prefix)/bin/ $(DESTDIR)$(prefix)/share/man/man1 \