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configure: fix linking with MSVC when using --disable-optimizations

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Without any optimization flags, MSVC does no dead code elimination (DCE) at
all, even for the most trivial cases. DCE is a prerequisite for building libav
correctly, otherwise there are undefined references to functions for other
architectures and disabled components.

-O1 is the minimal optimization flag for MSVC that does include DCE.
This commit is contained in:
Steve Lhomme
2016-12-15 18:00:56 +01:00
committed by Diego Biurrun
parent ef9a711be7
commit f7174d7ed0
1 changed files with 1 additions and 0 deletions
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configure vendored
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@@ -3279,6 +3279,7 @@ probe_cc(){
_DEPFLAGS='$(CPPFLAGS) $(CFLAGS) -showIncludes -Zs' _DEPFLAGS='$(CPPFLAGS) $(CFLAGS) -showIncludes -Zs'
_cflags_speed="-O2" _cflags_speed="-O2"
_cflags_size="-O1" _cflags_size="-O1"
_cflags_noopt="-O1"
if $_cc -nologo- 2>&1 | grep -q Linker; then if $_cc -nologo- 2>&1 | grep -q Linker; then
_ld_o='-out:$@' _ld_o='-out:$@'
else else