configure: Add -D_GNU_SOURCE to CPPFLAGS on OS/2.

The flag is required for some C99 math functions to be declared.

configure: Add -D_GNU_SOURCE to CPPFLAGS on OS/2.
The flag is required for some C99 math functions to be declared.
e14574eb · Diego Biurrun · 25101cf5 · e14574eb
Commit e14574eb authored May 26, 2011 by Diego Biurrun
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--- a/configure
+++ b/configure
@@ -2477,6 +2477,7 @@ case $target_os in
    os/2*)
        ln_s="cp -f"
        objformat="aout"
+        add_cppflags -D_GNU_SOURCE
        add_ldflags -Zomf -Zbin-files -Zargs-wild -Zmap
        SHFLAGS='$(SUBDIR)$(NAME).def -Zdll -Zomf'
        FFSERVERLDFLAGS=""