[FFmpeg-devel] [RFC]configures asmalign test does not work on icc64 11.0

[Måns Rullgård]

Carl Eugen Hoyos wrote:
> Hi!
>
> configure tests alignment with the following C program:
> __asm__ (".align 3");
> icc 11.0 for x86-64 optimizes the align away (even with -O0), so the test
> does not fail (it should, because the assembler does not like ".align 3").

Does using "__asm__ volatile" help?  Try this:

diff --git a/configure b/configure
index 0c8d31e..c2344e1 100755
--- a/configure
+++ b/configure
@@ -1110,7 +1110,6 @@ ar="ar"
 nm="nm"
 ranlib="ranlib"
 strip="strip"
-asmalign_pot="unknown"
 ln_s="ln -sf"
 objformat="elf"

@@ -2098,10 +2097,7 @@ fi
 VHOOKCFLAGS="-fPIC"

 # Find out if the .align argument is a power of two or not.
-if test $asmalign_pot = "unknown"; then
-    disable asmalign_pot
-    echo '__asm__ (".align 3");' | check_cc && enable asmalign_pot
-fi
+check_asm asmalign_pot '".align 3"'

 enabled_any $DECODER_LIST      && enable decoders
 enabled_any $ENCODER_LIST      && enable encoders

-- 
M?ns Rullg?rd
mans at mansr.com