[FFmpeg-devel] [PATCHv2] configure: warn if GCC 4.2 is being used

[Ganesh Ajjanagadde]

The wiki, Ticket1464, and Ticket3970 warn about the usage of GCC 4.2.
This fixes Ticket3970.

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>
---
 configure | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index e67ddf6..04a36e7 100755
--- a/configure
+++ b/configure
@@ -3544,6 +3544,7 @@ tms470_flags(){
 probe_cc(){
     pfx=$1
     _cc=$2
+    first=$3
 
     unset _type _ident _cc_c _cc_e _cc_o _flags _cflags
     unset _ld_o _ldflags _ld_lib _ld_path
@@ -3569,6 +3570,10 @@ probe_cc(){
         if ! $_cc -dumpversion | grep -q '^2\.'; then
             _depflags='-MMD -MF $(@:.o=.d) -MT $@'
         fi
+        if [ "$first" = true ] && $_cc -dumpversion | grep -q '^4\.2'; then
+            warn "gcc 4.2 is outdated and may miscompile FFmpeg. Please use a newer compiler."
+            warn "See https://trac.ffmpeg.org/ticket/1464 for more details."
+        fi
         _cflags_speed='-O3'
         _cflags_size='-Os'
     elif $_cc --version 2>/dev/null | grep -q ^icc; then
@@ -3731,7 +3736,7 @@ set_ccvars(){
     fi
 }
 
-probe_cc cc "$cc"
+probe_cc cc "$cc" "true"
 cflags_filter=$_flags_filter
 cflags_speed=$_cflags_speed
 cflags_size=$_cflags_size
-- 
2.5.0