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From ac2121bf962ecc054dd103ccd42a93912051672e Mon Sep 17 00:00:00 2001
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From: Kamil Dudka <kdudka@redhat.com>
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Date: Tue, 21 Jun 2016 12:40:26 +0200
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Subject: [PATCH] curl-compilers.m4: improve detection of GCC's -fvisibility=
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flag
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Some builds of GCC produce output on both stdout and stderr when --help
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--verbose is used. The 2>&1 redirection caused them to be arbitrarily
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interleaved with each other because of stream buffering. Consequently,
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grep failed to match the fvisibility= string in the mixed output, even
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though the string was present in GCC's standard output.
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This led to silently disabling symbol hiding in some builds of curl.
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Upstream-commit: b2dcf0347f1ee5041cccd64632bb8dd7ccbbae91
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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configure | 2 +-
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m4/curl-compilers.m4 | 4 ++--
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2 files changed, 3 insertions(+), 3 deletions(-)
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diff --git a/configure b/configure
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index 4797e02..fc260ee 100755
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--- a/configure
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+++ b/configure
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@@ -17636,7 +17636,7 @@ $as_echo_n "checking if compiler supports hiding library internal symbols... " >
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;;
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GNU_C)
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if test "$compiler_num" -ge "304"; then
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- if $CC --help --verbose 2>&1 | grep fvisibility= > /dev/null ; then
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+ if $CC --help --verbose 2>/dev/null | grep fvisibility= >/dev/null ; then
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tmp_EXTERN="__attribute__ ((__visibility__ (\"default\")))"
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tmp_CFLAGS="-fvisibility=hidden"
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supports_symbol_hiding="yes"
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diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
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index ca064dd..77371de 100644
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--- a/m4/curl-compilers.m4
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+++ b/m4/curl-compilers.m4
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@@ -21,7 +21,7 @@
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#***************************************************************************
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# File version for 'aclocal' use. Keep it a single number.
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-# serial 65
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+# serial 66
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dnl CURL_CHECK_COMPILER
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@@ -1391,7 +1391,7 @@ AC_DEFUN([CURL_CHECK_COMPILER_SYMBOL_HIDING], [
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GNU_C)
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dnl Only gcc 3.4 or later
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if test "$compiler_num" -ge "304"; then
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- if $CC --help --verbose 2>&1 | grep fvisibility= > /dev/null ; then
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+ if $CC --help --verbose 2>/dev/null | grep fvisibility= >/dev/null ; then
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tmp_EXTERN="__attribute__ ((__visibility__ (\"default\")))"
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tmp_CFLAGS="-fvisibility=hidden"
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supports_symbol_hiding="yes"
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--
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2.5.5
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