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From 629e05d8dc795a70fd2bcd3d0301641105bf0b06 Mon Sep 17 00:00:00 2001
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From: John Dennis <jdennis@redhat.com>
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Date: Wed, 15 Jun 2016 11:50:24 -0400
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Subject: [PATCH] enable user supplied CFLAGS
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Content-Type: text/plain; charset="utf-8"
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Content-Transfer-Encoding: 8bit
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CFLAGS is initialized to the empty string in configure.ac, this
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effectively turned off user supplied values for CFLAGS preventing site
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specific values from being used. A further complicating factor was of
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all the user supplied values documented in Automake only CFLAGS was
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disabled allowing all other user supplied variables to take
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effect. Some variables must be coordinated (e.g. CFLAGS with LDFLAGS),
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the fact LDFLAGS was picked up from the environment but CFLAGS was
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discarded caused build failures due to incompatible combination of
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compiler and linker options.
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The problem was first introduced in commit: 73d9c98f "Reset CFLAGS
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when --enable-debugging is used". This patch simply removes hardcoding
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CFLAGS to the empty string and appends the debug options
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(--enable-debugging) to the existing CFLAGS.
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Proper use of the variables is described in the Automake documentation
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in the section "Flag Variables Ordering"
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https://www.gnu.org/software/automake/manual/html_node/Flag-Variables-Ordering.html
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Although the Automake documentation claims manipulating CFLAGS
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directly is improper use there are many examples of this in the
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existing configure.ac, this patch makes no attempt at addressing this
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issue, rather it makes existing usage consistent. In the particular
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case of debug flags appending to CFLAGS is probably the only valid
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solution because the debug flags must appear at the end of the list of
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flags in order to override earlier flags, CFLAGS always appears last
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in the Makefile (see above Automake doc).
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Signed-off-by: John Dennis <jdennis@redhat.com>
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License: MIT
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---
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configure.ac | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/configure.ac b/configure.ac
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index 7c58870..cf86262 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -91,7 +91,6 @@ dnl
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dnl Check for programs
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dnl
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AC_PROG_CC
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-CFLAGS=""
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AM_CFLAGS=""
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AC_HEADER_STDC
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LT_AC_PROG_RC
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@@ -702,7 +701,7 @@ AC_ARG_ENABLE(debugging, [ --enable-debugging enable debuging optimizati
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if test "z$enable_debugging" = "zyes" ; then
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enable_debugging=yes
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LASSO_DEFINES="$LASSO_DEFINES -DLASSO_DEBUG"
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- AM_CFLAGS="-O0 -g -Wall -Wextra -Werror"
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+ CFLAGS="$CFLAGS -O0 -g -Wall -Wextra -Werror"
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else
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enable_debugging=no
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fi
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--
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2.5.5
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