Hi!
Ok for maint, or should the example be as simple as it can possible get
even if portability is sacrificed?
Cheers,
Peter
>From 782f44dd4d3d42beb9d43ee0dd7cf46accc44731 Mon Sep 17 00:00:00 2001
From: Peter Rosin <p...@lysator.liu.se>
Date: Thu, 5 Jan 2012 01:43:11 +0100
Subject: [PATCH] amhello: help compilers not supporting -c and -o together
doc/amhello/configure.ac: Add AM_PROG_CC_C_O.
doc/automake.texi (Hello World): Likewise. Also update the expected
output from autoreconf and configure. Describe what AM_PROG_CC_C_O
does in brief terms.
doc/Makefile.am (amhello_configury): Add compile.
---
doc/Makefile.am | 1 +
doc/amhello/configure.ac | 1 +
doc/automake.texi | 18 +++++++++++++-----
3 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/doc/Makefile.am b/doc/Makefile.am
index f4f76c6..0839d5f 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -55,6 +55,7 @@ amhello_configury = \
aclocal.m4 \
autom4te.cache \
Makefile.in \
+ compile \
config.h.in \
configure \
depcomp \
diff --git a/doc/amhello/configure.ac b/doc/amhello/configure.ac
index cd378cb..5fef25f 100644
--- a/doc/amhello/configure.ac
+++ b/doc/amhello/configure.ac
@@ -5,6 +5,7 @@
AC_INIT([amhello], [1.0], [bug-autom...@gnu.org])
AM_INIT_AUTOMAKE([-Wall -Werror foreign])
AC_PROG_CC
+AM_PROG_CC_C_O
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([
Makefile
diff --git a/doc/automake.texi b/doc/automake.texi
index 0c4dc01..3a08ee2 100644
--- a/doc/automake.texi
+++ b/doc/automake.texi
@@ -1470,6 +1470,7 @@ create the @command{configure} script.
AC_INIT([amhello], [1.0], [@value{PACKAGE_BUGREPORT}])
AM_INIT_AUTOMAKE([-Wall -Werror foreign])
AC_PROG_CC
+AM_PROG_CC_C_O
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([
Makefile
@@ -1487,14 +1488,15 @@ command as follows:
@example
~/amhello % @kbd{autoreconf --install}
-configure.ac: installing `./install-sh'
-configure.ac: installing `./missing'
+configure.ac:4: installing `./compile'
+configure.ac:2: installing `./install-sh'
+configure.ac:2: installing `./missing'
src/Makefile.am: installing `./depcomp'
@end example
At this point the build system is complete.
-In addition to the three scripts mentioned in its output, you can see
+In addition to the four scripts mentioned in its output, you can see
that @command{autoreconf} created four other files: @file{configure},
@file{config.h.in}, @file{Makefile.in}, and @file{src/Makefile.in}.
The latter three files are templates that will be adapted to the
@@ -1509,16 +1511,17 @@ checking for gawk... no
checking for mawk... mawk
checking whether make sets $(MAKE)... yes
checking for gcc... gcc
-checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
-checking whether we are cross compiling... no
+checking for C compiler default output file name... a.out
checking for suffix of executables...
+checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
+checking whether gcc and cc understand -c and -o together... yes
configure: creating ./config.status
config.status: creating Makefile
config.status: creating src/Makefile
@@ -1577,6 +1580,7 @@ Let us begin with the contents of @file{configure.ac}.
AC_INIT([amhello], [1.0], [@value{PACKAGE_BUGREPORT}])
AM_INIT_AUTOMAKE([-Wall -Werror foreign])
AC_PROG_CC
+AM_PROG_CC_C_O
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([
Makefile
@@ -1635,6 +1639,10 @@ creates @file{src/Makefile} from @file{src/Makefile.in},
it will define
a @file{Makefile.in} that uses @code{CC} but @file{configure.ac} does
not define it, it will suggest you add a call to @code{AC_PROG_CC}.
+The @code{AM_PROG_CC_C_O} line triggers the help from the @command{compile}
+script when the C compiler does not support the @option{-c} and
+@option{-o} options together.
+
The @code{AC_CONFIG_HEADERS([config.h])} invocation causes the
@command{configure} script to create a @file{config.h} file gathering
@samp{#define}s defined by other macros in @file{configure.ac}. In our
--
1.7.5.1
