Opened 5 years ago

Closed 4 years ago

#3970 closed enhancement (fixed)

configure should warn about gcc 4.2

Reported by: cehoyos Owned by:
Priority: wish Component: build system
Version: git-master Keywords: gcc
Cc: michael, gajjanagadde@gmail.com Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Some old gcc versions including gcc 4.1.2 work fine with current FFmpeg but gcc 4.2 produces several issues with fate, configure should warn if it is used.
One example is the h.264 decoder that gets miscompiled since 4d70023a (other issues exist!). I tested gcc 4.2.3.

$ make SAMPLES=fate-suite/ fate-h264-conformance-caba3_toshiba_e
TEST    h264-conformance-caba3_toshiba_e
--- ./tests/ref/fate/h264-conformance-caba3_toshiba_e   2014-09-22 20:58:45.634775218 +0200
+++ tests/data/fate/h264-conformance-caba3_toshiba_e    2014-09-22 21:25:42.285118695 +0200
@@ -1,301 +1,301 @@
 #tb 0: 1/25
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Test h264-conformance-caba3_toshiba_e failed. Look at tests/data/fate/h264-conformance-caba3_toshiba_e.err for details.
make: *** [fate-h264-conformance-caba3_toshiba_e] Error 1

Change History (7)

comment:1 Changed 5 years ago by cehoyos

  • Keywords gcc added

See also ticket #1464.

comment:2 Changed 4 years ago by michael

We seem to have fate clients with 4.2.1 and 4.2.5 which pass all tests

comment:3 Changed 4 years ago by cehoyos

These compilers are probably patched (I only tested releases) or the issue is only reproducible on x86.

comment:4 Changed 4 years ago by michael

  • Cc michael added

comment:5 Changed 4 years ago by gajjanag

  • Cc gajjanagadde@gmail.com added

comment:6 Changed 4 years ago by gajjanag

Even if we can track down which commit in GCC fixed this, we don't know which distributions patched their compilers appropriately. If we knew exactly which commit in GCC introduced the regression and which one fixed it, we could report that in our warning message. I am not sure that it is all worth it. Warning for 4.2 should be enough; after all we do not error out, and the users should expect potential trouble. I think the false positive warnings are thus acceptable for the time being.

comment:7 Changed 4 years ago by cehoyos

  • Resolution set to fixed
  • Status changed from new to closed

Warning implemented by Ganesh Ajjanagadde in bfe525e6328e506ffab055ab5dc6acb2dfdfe8e5

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