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configure: Check for getenv

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When targeting the "windows store application" (metro) API subset
(or the windows phone API subset), the getenv function isn't
available. If it is unavailable, just define getenv to NULL.

The check uses check_func_headers, since the function actually
might exist in the libraries, but is hidden in the headers.

The fallback is in config.h since msvc can't do -D defines with
parameters on the command line, and it's used both within the
libraries and the frontend applications (so a libavutil internal
header wouldn't be enough).

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-11-30 11:16:58 +02:00
parent 2b677ffca5
commit 2cca96e670
1 changed files with 3 additions and 0 deletions
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3
configure vendored
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@ -3499,6 +3499,7 @@ check_func nanosleep || { check_func nanosleep -lrt && add_extralibs -lrt; }
check_func fcntl
check_func fork
check_func_headers stdlib.h getenv
check_func gethrtime
check_func getopt
check_func getrusage
@ -4086,6 +4087,8 @@ if enabled yasm; then
printf '' >$TMPASM
fi
enabled getenv || echo "#define getenv(x) NULL" >> $TMPH
if enabled msvc && ! enabled shared; then
echo '#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")' >> $TMPH
echo '#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")' >> $TMPH