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configure: check for -fvisibility=hidden

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and make it the default if available. this limits symbol visibility to
those marked with WEBP_EXTERN.

Change-Id: I529bf6d143a3008d9385044c87ad7dce72dce9a0
This commit is contained in:
James Zern 2015-12-14 22:55:01 -08:00
parent d6dad5d05f
commit 846caff47f
1 changed files with 1 additions and 0 deletions
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configure.ac
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@ -52,6 +52,7 @@ AC_DEFUN([TEST_AND_ADD_CFLAGS],
[$1="${$1} $2"],
[AC_MSG_RESULT([no])])
CFLAGS="$SAVED_CFLAGS"])
TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-fvisibility=hidden])
TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wall])
TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wdeclaration-after-statement])
TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wextra])